OpenStreetMap

Diary Entries in English

Recent diary entries

Clever use of OSM in marketing brochure

Posted by Alan Bragg on 6 April 2017 in English (English)

I recently received a brochure from my on-line bank showing the location of their no-fee ATMs near my home. The attribution in the bottom left corner reads "LOCR/OpenStreetMap"

I found more information at Locr selects OSM

I was impressed.

Location: The Great Road, Bedford, Middlesex County, Massachusetts, 01730, United States of America

My Hisory

Posted by Emi Rizki Ayunanda on 6 April 2017 in English (English)

My name is Emi Rizki Ayunanda

A valuable find - free parking in Florence

Posted by michalfabik on 5 April 2017 in English (English)

During our recent trip to Florence, a notoriously car-unfriendly city, I found this car park. I forgot to take a picture, but it obviously once was a paid car park that has been abandoned since. (By the authorities that is, not so much by the drivers.) The small building at the northern end looks like it might have served for the personnel and at the entrance and exit there are what looks like remains of lift gates that have been broken or sawn off. There are no blue signs with white "P" on them but there are no parking restrictions either. Many of the cars there were covered with a thick layer of dust, some had long (as in months) overdue parking tickets behind their wipers, others looked quite ordinary and came and went during our stay.
I asked some passers-by and all of them confirmed that it was ok to park there and that the locals regularly do so, only that we shouldn't leave anything of value in the car. I left the car there and it was still there the next day, quite happy and unharmed.
Of course, I mapped the whole thing and proudly added a "fee=no". The trouble is, technically it's not an "amenity=parking" at all because it's not designated as such on-site. "disused:amenity=parking" comes to mind but it's not disused either, as people keep using it. "access=permissive" and possibly "access=discouraged" come close but not quite. So I added "informal=yes" like some footpaths have, although the car park certainly was "intentionally established" and didn't just "evolve", as the Wiki defines it. Actually, I'm pretty sure I know at least a few car parks where "informal=yes" would fit perfectly, but this isn't one of them.
So, do we have a better way of dealing with this?

Location: Quartiere 3, Florence, Metropolitan City of Florence, Tuscany, Italy

Edits from StreetComplete

Posted by PlaneMad on 5 April 2017 in English (English)

While reviewing edits in my neighbourhood, stumbled on a lot of edits by a new editor called StreetComplete. Streetcomplete seems like an open source map editor on Android to quickly add missing metadata to OSM around your location like streetnames, road surface opening hours etc. using a simple form based UI.

Github: https://github.com/westnordost/StreetComplete

Curious, I listed all the changesets from StreetComplete using osmcha and was surprised to find over 30,000 changesets since the first one in Nov 30 last year. Just yesterday, there was 2,700 changesets uploaded, so there seems to be a sudden surge in editing activity.

The edits in my city were mostly adding the road surface and looked quite good, and its exciting to see such well designed tools driving new contributors to the map. If you are curious use osmcha bbox filter to review edits from StreetComplete in your area and share any observations on the editing activity.

Gedling Treasures

Posted by alexkemp on 4 April 2017 in English (English)

Buildings in Gedling worth a second look:–
(see also Key:heritage + Key:listed_status + Key:HE_ref)

Gedling Borough Council claim 200 buildings to have been listed by Historic England within the area that they control, and offer a PDF to download with all such buildings listed by district (the PDF is based on information from a very old listing and not updated). There are just 7 listed for Gedling Village itself. Here are five that I mapped recently + an unlisted extra:–

Hardstaff Almshouses, Gedling

heritage=2
heritage:operator=he (“Historic England”)
listed_status=Grade II
HE_ref=1268312 (listing)
start_date=1935
name=The Mary Elizabeth Hardstaff Homes
wikipedia=en:Mary Hardstaff Homes
One of the ladies living here gave me the 3rd Degree interrogation, and with good reason. Many folks photograph these Almshouses on Arnold Lane due to their Grade II listing. The lady did not mind that, but she did mind folks that saw the photos then came round & nicked stuff from the gardens (there are many fine displays of gnomes & such-like in front of the homes). I was sorely tempted to picture some of them, but promised her that, on this occasion, I was photographing only the building:–

Hardstaff Almshouses, Gedling

Manor Farmhouse

heritage=2
heritage:operator=he (“Historic England”)
listed_status=Grade II
HE_ref=1227477 (listing)
start_date=mid-1700s
name=Manor Farmhouse
Manor Farmhouse was bought by Jane Neave (JRR Tolkein's aunt) at the same time as she & her partner bought Phoenix Farm + a hundred-odd small parcels of Earl Manvers' land in 1911. The farm contains a unique round turret within the body of the farmhouse. Here is a recent picture of it:–

Manor Farm, Gedling

All Hallows Church, Gedling

heritage=2
heritage:operator=he (“Historic England”)
listed_status=Grade I
HE_ref=1235924 (listing)
start_date=1089
name=The Parish Church of All Hallows
This is Gedling's local CoE church, and the church authority states it to be constructed in start_date=1089 A.D.. I mapped it recently, and here are a couple of views:–

all hallows gedling rear garden

all hallows gedling rear garden spire

The Countess of Carnarvon’s Fountain, Gedling

pmsa_ref=10541 (listing)
start_date=1874
name=Carnarvon's Fountain
As recorded by the Public Monuments & Sculpture Association this is a fine — though non-working — public Fountain donated to Gedling on December 1874 by Lady Carnarvon (Lady Evelyn Stanhope, wife of the 4th Earl). Lady Evelyn died in 1875 & the Earl remarried.

Carnarvon’s Fountain, Gedling

The Fountain stands near the centre of Gedling alongside the junction of Main Road & Arnold Lane. A large cast-iron downpipe is supposed to deliver water into a large trough (for horses) and a smaller trough at the base (for dogs). From U3A research (pdf) the local Hunt would meet here & make use of the trough. The U3A declare that the Fountain was fed by water pumped from Allwell Spring. They further declare this spring to have been located at the corner of Arnold Lane and Lambley Lane (0.5km distant), and that a Windmill stood above it & pumped the water into two cisterns & thence down to the Fountain.

As the name “Allwell” implies an everlasting stream, you may not be surprised to hear that it failed after just 50 years (1924), that the Fountain has been dry ever since, and that the windmill was torn down shortly after. In addition, Ouse Dyke is barely 100m away from the Fountain and may have been a better option, but never mind.

86 + 88 Main Road, Gedling

heritage=2
heritage:operator=he (“Historic England”)
listed_status=Grade II
HE_ref=1227485 (listing)
start_date=mid-1800s
Main Road is an extension of Arnold Lane after it meets the town centre, so I guess that it should be no surprise that all of these listed buildings are quite close to each other. Having said that, and although they are very nice, I fail to understand why these two semi-detached cottages have been given Grade II status:–

88 Main Road, Gedling86 Main Road, Gedling

24 Shearing Hill & Adjoining Stable, Gedling

heritage=2
heritage:operator=he (“Historic England”)
listed_status=Grade II
HE_ref=1227496 (listing)
start_date=early-1700s
Shearing Hill is an extension of Main Road, so the comments applied to the Main Road cottages also apply to this former farmhouse. The building is perfectly classic to it's date of construction in that it is built with it's gable-end facing the street. It is actually divided into two houses, with #22 closer to the street; only #24 is shown here:–

24 Shearing Hill & Adjoining Stable, Gedling

Location: Arnold and Carlton, Gedling, Nottinghamshire, East Midlands, England, United Kingdom

Beginner's diary

Posted by loviisajenny on 4 April 2017 in English (English)

Plaplaplapa

Routing — Bearing Constraints for Departure and Arrival

Posted by daniel-j-h on 4 April 2017 in English (English)

The Open Source Routing Machine supports bearing constraints for quite a while now. In the following I want to highlight their use-cases and effects on routing.

Suppose you are driving north and make a routing request. An instruction to take a U-turn — since the routing engine does not know your heading — would be undesirable. This is the primary use-case for setting bearing constraints.

Setting a constraint of bearings=0,90 tells the routing engine you are heading north and you want to allow for a variation of +-90 degree around true north. The format is value, range with

  • value in 0, 360 degree for the direction; 0 degree represents true north, 90 represents east and so on
  • range in 0, 180 degree for the allowed variation around the value; a variation of 90 degree allows for +- 90 degree

The bearings=0,90 constraint therefore allows the route to start off towards north +- 90 degree. But not in the opposite direction you are currently heading. Sweet!

Another interesting use-case I came across at FOSSGIS is fire truck routing where your vehicles have to arrive at the right side of the street. Using bearing constraints not only for the route's start but its end location we can let the routing engine generate optimal routes which guide vehicles to the right side of the street.

Here are two routes from a fire department in Berlin to an arbitrarily chosen location:

  • In orange with a bearing constraint of 0,90 guiding the fire trucks to the location from the northern direction (raw request)
  • In green with a bearing constraint of 180,90 guiding the fire trucks to the location from the southern direction (raw request)

Bearings in action

Of course the use-case for end location bearing constraints is not limited to fire truck routing. The same applies to logistics use-cases or optimizing routes based on the probability of finding parking spots.

In short: providing a start location bearing constraint makes users happy. For advanced use-cases in addition set end location bearing constraints.

Check out the documentation for our beloved Open Source Routing Machine.

Vespucci 0.9.9 beta released

Posted by SimonPoole on 4 April 2017 in English (English)

Now despite the difficulties of garnering attention when your app doesn't break things, Vespucci development has carried on and I'm pleased to announce that the first "official" beta release of 0.9.9 is available from googles play store and from our github repository.

While there are quite a few user visible changes, most of the work since the release of 0.9.8 has been under the hood, improving the maintainability, testing, documentation and code quality throughout the app, making it much easier to contribute to its development.

It should however be noted that Vespucci has a relatively large code base and contributing to the code (but not to the documentation, presets and other aspects of the app) remains fairly complex. See vespucci on OpenHub for more on that.

The release notes give an overview of what has changed, here just some highlights:

filter selection

preset filter in action

  • way improvement handle use now follows the same pattern as iD
  • javascript based scripting

And where is the elusive openinghours editor? I've resumed work on it and there is a reasonable chance that it will be included in the 0.9.9 release even though there is still a fair bit of work to do.

Lets have changeset mentions

Posted by PlaneMad on 3 April 2017 in English (English)

On an average, there are atleast 40 data reverts per day. Most changesets comments are non descriptive like revert previous change making it very hard for the community to track the action and any previous changeset or discussion.

It would be really useful if OSM implemented a changeset mention feature like GitHub, where if I fixed a changeset with a comment Remove duplicate features added in #47398827, it would automatically add a comment to the original changeset and notify the original mapper and anyone in the community know what action was taken. This would greatly improve the social aspect of mapping and link discussions over multiple changesets.

Any other cases where this could be useful?

Missing Roads in Jambi Indonesia.

Posted by Mikelatham on 2 April 2017 in English (English)

In and around Jambi Indonesia, most of the roads seem to be incomplete and the satellite information here is in realy low res.

Location: Jalan Gajah Mada, Simpang Iv Sipin, Jambi, 36135, Indonesia

Garlyk Potash Plant in Lebap

Posted by apm-wa on 2 April 2017 in English (English)

I traveled with the rest of the diplomatic corps to the new potash mine and processing plant near Garlyk, Lebap welayat. Used the Garmin GPS to collect railroad GPS traces to the last station, then Pocket Earth on my iPhone to collect GPS traces of the new road paved from there to the plant. Uploaded all traces yesterday and corrected the rail route, then added a new section of road. The GPS function on the iPhone drains the battery quickly so I used a backup battery nearly the entire trip. The rail car had a 220-volt outlet so I could keep the Garmin GPS charged. The traces are public so anybody can see/use them.

Location: Lebap Region, Turkmenistan

Searching for the Source of Ouse Dyke #4

Posted by alexkemp on 1 April 2017 in English (English)

[See Part #3 for Summary & Detail on the 2 streams that constitute the source of Ouse Dyke]

Part #3 brought the story of Ouse Dyke from it's sources up to an old bridge across the lowest point of Lambley Lane. The bridge used to carry the Lane across the Dyke, and the stream still flows in a culvert below that bridge. That culvert follows the course of the original stream through modern housing north of All Hallows Church. I met residents living close-by that recall the original stream as lads & they confirmed each length & dog-leg on it's way to Willow Park.

From the bridge the stream flowed at the bottom of the South Recreation Park; the culvert today (and the stream yesterday) travels under a walk between #122 & #124 that lets folks get to the Park from Lorimer Avenue.

Here is the bridge, the path of the culvert/stream through the Park & the walk to Lorimer Avenue:–

Lambley Lane Bridgestream+culvert linewalk to Lorimer Av

Almost exactly opposite the walk that connects to the Park from Lorimer Avenue is yet another walk that connects through to Hereford Road. That walk opens out onto a large tarmacked area at the end of the cul-de-sac and just beyond that is an even larger grassed area. Sure enough, the local knowledge is that this was where the stream did a dog-leg turn, so it's not too surprising that there are 3 manhole-covers at the centre of the dog-leg, and that the culvert once again simply follows the line of the original stream, at the end travelling under Saltford Close until it emerges as an open stream again for a little way .

Here is the second walk, part of the large tarmacked area (viewed from the end of Ullswater Close) with the man-hole covers, the long green and the beginning of the open stream (which has been landscaped at his own cost by the chap in the house alongside):–

walk from lorimer av to hereford roadtarmac areaman-hole coverslong greenopen dyke

And finally, this open section of Ouse Dyke goes back into a culvert for a little way before it emerges into Willow Park as an open stream once again. It becomes culverted near the top of a private drive. Even the householder at the top did not know that it was there, but I found it!

Ouse Dyke before the culvert

The path of Ouse Dyke is well mapped following it's passage through Willow Park, so my search for the source of Ouse Dyke + subsequent mapping is completed.

Location: Arnold and Carlton, Gedling, Nottinghamshire, East Midlands, England, United Kingdom

Heritage in Flanders and Crowd-Sourced Projects

Posted by escada on 1 April 2017 in English (English)

Introduction

Distinctive emblem for cultural property

In this article I want to show you how one can add information about immovable heritage to crowd sourced projects such as OpenStreetMap and some of the projects of Wikimedia.

In Belgium, the list of immovable heritage is controlled by three agencies, one for Flanders, one for Brussels and one for Wallonia. In Flanders, the agency is called Agentschap Onroerend Erfgoed. They make a catalogue of the items and decide on the protection. They also provide some of their ata as open data. In their catalogue they have churches, abbeys, castles, but also small farmhouses and villas, furthermore it includes small items such as boundary stones and pillories. Occasionally, the list contains important trees on town squares.

Pillory in Aartselaar

Pillory in Aartselaar

What is a crowd-sourced project ? It is a project in which everybody can add data, unlike projects that are run by companies, where only employees can add data. When a company owns that data it can set the rules and price to get access to the data. In a crowd-sourced project, normally the resulting database is free to use and consult. If you want to find out more about crowdsourcing, read the Wikipedia article on the topic.

This also explains why it is interesting to have all the immovable heritage in crowd-sourced project: one no longer depends on an agency or copyright rules defined by that agency to know when a building was created, or use a picture of a watermill in a publication, etc.

The scope of an agency such as Onroerend Erfgoed is also limited to a specific geographic region, the crowd-sourced projects presented below all have a world-wide scope.

Let us now introduce some of the crowd-sourced projects

OpenStreetMap

This is a global database of geographical info. This database can be used to created maps. Wikipedia definition of OpenStreetMap. Note that in OpenStreetMap, we only map features that exist today. We do not map buildings that are completely demolished.

Wikipedia

An online encyclopedia about human knowledge. Items are described in articles and illustrated with images, just as in printed encyclopedia. Wikipedia definition of Wikipedia

[Wikimedia Commons](hhttps://commons.wikimedia.org)

A database of media files such as photos, videos sound fragments and maps. Wikipedia definition of Wikimedia Commons

Wikidata

A database about persons, facts, objects. Wikipedia definition of Wikidata

What can we contribute and where ?

The location and the floor plan of the heritage item, together with its name and some basic information can be put in OpenStreetMap. An article describing the origin and history of the item goes into Wikipedia. Photos, 3D-models, a movie taken with a drone are placed in Wikimedia Commons. And finally, a summary of the above information can be put in machine-readable format into Wikidata.

How do we collect information ?

OpenStreetMap is for a large part based on original survey. That means that the contributors go out and collect information about the world while they look at it. Wikipedia on the other hand is largely based on other sources and each article has a list of articles that are referenced. For Wikimedia Commons, one need to own the copyright of the media that one adds, or the file has to be out of copyright. Ideally, each property of a Wikidata item has a source, so just as for Wikipedia, the data is based on the work of others.

How do I collect information ?

My starting point is the list of immovable heritage items on Wikipedia. For Flanders, previous contributors have compiled a list of items per village. I wrote a [Python](https://en.wikipedia.org/wiki/Python_(programming_language) program that converts such a wiki-page into a file with waypoints that can be used on a GPS-device or in navigation programs for smartphones such as OsmAnd.

Garmin Dakota 10 with waypoints Details on Garmin

Garmin Dakota 10 showing heritage items as red and blue flags, as well as some details on the item

OsmAnd

In OsmAnd the waypoints are displayed as red circles with white star. Clicking on a star shows additional information at the bottom of the screen. In case there are multiple items close to one another, the details are listed for each item

This allows me to make small detours during my planned walks in order to visit (or view) the historical items. At the location I check whether the item still exists and take pictures of it. When the item no longer exists, I inform the Onroerend Erfgoed agency later on so they can update their database as well. I have the impression that they appreciate this kind of feedback.

How do I process the collected data ?

Back home, I make sure that the pictures get georeferenced by using the GPS trace of my walk and the timestamp of the picture. I use Geotag for that purpose.

The good, georeferenced photos are uploaded to Commons Wikimedia, a name and description are added as well as some categories. This category system is not always easy to understand, but I try to at least add "Onroerend erfgoed in " and the category of the "part-village".

When this is done, I update the Wikipedia page with the list of heritage items in a town with a link to the newly uploaded photo. Of course, only when that page did not had a picture of the item before.

I also add the building layout to OpenStreetMap, and add the necessary tags to mark the area as a historic/protected item, with references to Onroerend Erfgoed. When there is a Wikipedia article or a Wikidata item those references get added as well.

Adding the necessary tags is easy in JOSM, especially when you use the preset for historical objects found in the BENELUX presets.

BENELUX Preset for monuments protected by Onroerend Erfgoed BENELUX Preset for monuments protected by Onroerend Erfgoed

You can also start writing Wikipedia articles for the items and/or create a Wikidata item with some properties. I recently started adding items for churches in Flanders based on information found the in the Onroerend Erfgoed and ODIS databases.

How can you use the data ?

Wikipedia

The articles on Wikipedia can be read by anyone and further information can be found through the referenced articles, e.g. the article on the Cathedral in Antwerp.

OpenStreetMap

There are a number of maps based on OpenStreetMap that show those items.

HistOsm

Is a map created by University of Heidelberg GIScience (Geoinformatics) Research Group. More information

HistOsm Map HistOSM, all data (c) OpenStreetMap Contributors

Historic Places

Is a map developed by some German enthusiasts in their spare time. It is available is several languages and has some nice features such as the possibility to display old maps instead of contemporary maps based on OpenStreetMap data.

Historic Places Map Historic Places, all data (c) OpenStreetMap Contributors. Topographical Map Vandermaelen.

Each historic feature has a popup window which shows the information about the item as it is stored in the OpenStreetMap database. The popup can contain links to Onroerend Erfgoed (if there is a tag ...), wikipedia and wikidata. The tag image is recognized and will display the image if it is released under an open license (as is the case for images on Wikimedia Commons). The tag wikimedia_commons is also recognized and the link will bring you to the Wikimedia Commons page displaying the category with all images on the item.

The wikidata tag can not only be explored on the wikidata.org website, but also in "beautified" pages such as Reasonator and Sqid when you click on the icons next to the Wikidata item number.

Reasonator for Q28464643 The Sint-Pieterskerk in Rumst as seen on the Reasonator website with data from Wikidata

If you look at a Reasonator page such as the one for the Parochiekerk Sint-Pieter (Q28464643), you will find a link to "Overpass" under the maps. This will show the item on OpenStreetMap. So it is possible to define user interfaces on either Wikidata or OpenStreetMap and jump to the other project.

The result of clicking the Overpass link on the above Reasonator page, shows the following page in which the Sint-Pieterskerk is highlighted and positioned in the middle of the visible map.

Overpass showing item with Wikidata tag Overpass UI showing the item with Wikidata identifier Q28464643

Wikidata

Since the data in Wikidata is structured, unlike the full text sentences in Wikipedia, one can query the data. This makes it e.g. possible to create a time line with the inception date of Belgian churches, or a bubble chart with their architectural styles. By clicking on the links in this paragraph, you are taken to the query site of Wikidata where you can run the queries and explore the data yourself.

timeline of Belgian Churches A time line of churches in Belgium

bubble chart of architecture of Belgian Churches Architectural Styles used in Belgian churches

You can also make maps that combine Wikidata with OpenStreetMap shapes. The following map retrieves all Belgian churches from Wikidata when they have an inception date. According to this date, they get a different colour. The shape is taken from OpenStreetMap.

Wikidata and OpenStreetMap Combining Wikidata and OpenStreetMap

You can look at the map on my Wikimedia user page and explore the data yourself, or look at the code used to generate the map.

Conclusion

I hope that the examples give you an idea of what is possible with crowd-sourced, open data. I think the possibilities to connect Wikidata and OpenStreetMap are endless and that better integration tools will appear in the future.

p.s. the article is also published on the Belgian OSM website.

Drone photos from Klix.ba

Posted by michalfabik on 1 April 2017 in English (English)

Some time ago, I noticed that the Bosnian news portal Klix.ba sometimes use drone photos to accompany their news articles. I contacted the company and the author, their staff photographer Edin Hadžihasić, and they have kindly given their permission (in Serbo-Croatian) to use the pictures for tracing.

I aligned the photos with existing map data using Map Warper:

http://mapwarper.net/maps/18372#Preview_Map_tab
http://mapwarper.net/maps/18361#Preview_Map_tab
http://mapwarper.net/maps/18422#Preview_Map_tab
http://mapwarper.net/maps/18475#Preview_Map_tab
http://mapwarper.net/maps/18483#Preview_Map_tab
http://mapwarper.net/maps/18750#Preview_Map_tab
http://mapwarper.net/maps/18805#Preview_Map_tab
http://mapwarper.net/maps/18813#Preview_Map_tab
http://mapwarper.net/maps/18816#Preview_Map_tab
http://mapwarper.net/maps/19060#Preview_Map_tab
http://mapwarper.net/maps/19332#Preview_Map_tab

My workflow was as follows:
- pick control points recognizable in both Bing imagery and the drone pictures
- map the control points in OSM as accurately as possible (or adjust position of existing OSM objects)
- align the drone photo with the updated OSM map using Map Warper

Sure you can see how inefficient and error-prone this method is but I couldn't find a way of aligning the drone photos with Bing directly, say by zooming and rotating a semi-opaque copy of the drone photo to fit with the corresponding part of Bing imagery. Any ideas?

Another problem is that there's a lot of distortion in places with sloping terrain - this can be best seen in the picture with Žuta Tabija.

The results aren't the most accurate thing in the world but as of now, there is no accurate imagery offset info available for the areas in question anyway, so I guess I didn't break stuff more than it already was. After tracing the photos in JOSM, the results are quite pretty, I dare say:

Before:
Before

After:
After

There's still stuff to be done of course. I plan on mapping driving lanes but I want to fix a couple of major intersections first and I need to do some on-site survey for that.

Location: Pofalići, Sarajevo, New Sarajevo municipality, City of Sarajevo, Sarajevo Canton, Entity Federation of Bosnia and Herzegovina, Bosnia and Herzegovina

Interesting lists of changesets by new mappers

Posted by PlaneMad on 31 March 2017 in English (English)

Searching for the Source of Ouse Dyke #3

Posted by alexkemp on 31 March 2017 in English (English)

[If any of the following does not make sense, then read Part #1 / Part #2 first]

Another survey yesterday (Thursday 30 March 2017) & I think that I can now say that the trace from source (or rather, both sources) & the beginning of the line of Ouse Dyke can be established. I needed to return to determine the line of the dyke from the Southern Basin to the beginning of it's culvert, and then it's passage between Lambley Lane & Jessops Lane. I've not only done both, but have met residents (and in particular a former Gedling Colliery miner) who have told me their memories from 40 years ago (1970s) as children or young men when the Ouse was placed in a culvert, and thus where it now travels, confirmed it's course within Gedling Country Park and some have expressed concerns that the many streams that fed it may currently be undermining the culvert.

Below is a summary, and then horrible amounts of detail, of those findings:–

Summary

There are 2 streams that are the source for Ouse Dyke:–

  1. A stream to the west (name currently unknown) that originates within Mapperley Golf Course, empties into a culvert just north of Kneeton Close, and then travels south and east along the line of a stream which was part of the northern boundary of Gedling Village. After crossing at the dip in Arnold Lane the stream (now culvert) ran almost due east-west and met the 2nd stream in the middle of what is now Lambley Lane Recreation Ground.
  2. The eastern stream originates now as a Northern Retention Basin, which overflows into a Southern Retention Basin, which itself overflows into a dyke, which enters a culvert at it's southern end and flows down to the original line of Ouse Dyke to a bridge across the lowest point of Lambley Lane, then south to Willow Park.

Detail

Detail on the western source is well covered at the end of Part #1 and the beginning of Part #2, so this detail will concentrate on the eastern source, the amalgamation of the two sources + it's passage through to Willow Park.

Important note:– I made the survey below when the weather was dry & the water was low; even so, it was more than a touch treacherous. Surveying this or similar areas in other conditions is an excellent way to drown and/or break limbs. You perform all such efforts at your own risk & expense. You have been warned.

Historically the eastern source originated upon what is now known as Gedling Country Park, and in particular upon the higher parts to the North & East of that land. This entire locality of Nottinghamshire is geologically composed of layers of Sandstone & Clay. Clay is impervious to water, so that structure leads to the land having many springs.

In more recent times, the Digby Coal Company sunk it's pits in that area, and deposited it's spoil on land to the north of Glebe Farm (the miner told me that in his working life he watched as an abandoned farmhouse on the hillside above the West fields was steadily buried - it now no longer shows). Springs are a terrible danger for Spoil Heaps, and Severn Trent Water have used Ouse Dyke as part of it's water-management regime.

The section of the map known as Solar Power Plant has been extensively filled with dykes which drain down to two Detention Lagoons to the west & south. The photograph below looks across the south basin at one of the two overflow channels between the higher north basin & itself:–

overflow channel between basins

The next photograph is from the other side of the same Southern Basin, looking across to the very position from which the first photo was taken. There were 2 moorhens on the water just before I took the photo, and one dived down just as I pressed the shutter (it was hiding it's embarrassment at the fact that I left my finger in view). If you look at the shore immediately beyond the circles that it left in the water you will see an overflow channel which empties on the further side into Ouse Dyke:–

overflow channel into Ouse Dyke

So the North Basin overflows into the South Basin, and it overflows into a concrete channel which, the miner informed me, follows the exact path that Ouse Dyke took in his youth. This is the point where the overflow channel empties into the dyke:–

concrete Ouse dyke

...and now some of the path through the scrub (and yes, I forced myself through bramble & thick brush to convince myself that I was tracking the real McCoy the whole route) (the path is more complicated than a single line, and lots & lots of other pipes also empty into this section of dyke) (I had a great time!):–

more concrete Ouse dyke

The drain is not very long at this point; this is at the end, looking back the other way, just before it enters a 6' / 2m high culvert:–

looking north along Ouse Dyke

The retired miner told me that Ouse Dyke ran “alongside the old railway” (that is the old mineral railway which Gedling Council have safe-guarded from development as a possible extension for the Nottingham Tram). The short section of drain photographed above runs parallel to that previous railway line, but stops short just before where the safe-guarded section stops. On the other side of where the line of the railway was is a cutting in the land. I explored it & found yet another man-hole cover for the culvert, at about the same height as the culvert, with a strong noise of flowing water above it (this was the manhole that I discussed with STW in Part #2). Here is it's photo (I have zero idea as to where the basin of water came from!):–

manhole #3

As spoken about in earlier parts, the culvert follows the original line of Ouse Dyke through (what is now) a Recreation Park. There are two further manhole-covers within the park, with the southern one being the point at which the two source-streams currently & historically united. The stream (and now culvert) continued south to the lowest part of Lambley Lane, where an old bridge carried the lane across the stream. The stream is gone & the bridge is mostly buried, but enough shows to give some indications of the stream that once flowed openly beneath it (this photo is from the southern side of the bridge):–

Lambley Lane bridge

[continued in Part #4]

Location: Arnold and Carlton, Gedling, Nottinghamshire, East Midlands, England, United Kingdom

A Personal Message from Fatty2000

Posted by alexkemp on 31 March 2017 in English (English)

Just received this PM:

Hi alexkemp,

Fatty200 has sent you a message through OpenStreetMap with the subject Good morning,:

Fatty200
31 March 2017 at 11:30

My name is Fatima, please lets talk very well with my email address[ fatimaabde23@gmail.com ] for good friendship and i will send you my pictures if you want. Thanks and take care.

(someone with the necessary admin clearances, please delete this idiot)
(he has gone - thank you)

The difference between a roundabout and "just a road that goes in a circle"

Posted by skquinn on 31 March 2017 in English (English)

I've seen a lot of mistagged roundabouts lately in Texas (with the help of Keep Right). Please review the definition on the wiki: junction=roundabout should have at least three roads coming from it (two directions of a through street and a side street). Not everything round is a roundabout, and routing tools will give incorrect and/or confusing directions if something is mistagged as a roundabout.

Location: Hawthorne Place, Houston, Harris County, Texas, 77093, United States of America

You can add it. But should you?

Posted by BushmanK on 30 March 2017 in English (English)

OSM has some more or less clear criteria to decide if a certain information should be added to it or not. However, these criteria only take a nature of it into account. For example, there is no doubt that store operator is verifiable once it is known. Anyone could confirm that using the same source (store nameplate that refers to a company, open business registry, etc.) But will they do that?

I mean, time passes, store changes its owner. How possible it is that someone will update this kind of information? Definitely, less possible than, say, in a case of changed store name. Simply because it is harder to notice that change than to find out all details when you just going to create a POI.

It doesn't mean that we should avoid adding this kind of information, but it does mean that an ability to keep a certain fraction of information up to date should be taken into consideration before adding it.

This diary entry is inspired by a question I came across today: "How to/ should we add time zone information to OSM?" My own short answer was "no". A longer answer is: while OSM is not an authority on keeping reliable time zone information (IANA tzdb is), nobody who uses this information for something important will look for it here. At the same time, OSM can not be an authority exactly because of its nature: "anyone can edit it" (and nobody is truly responsible for data quality, unlike with tzdb, where Paul Eggert is an official responsible person).

So, theoretically, time zone information meets general criteria for data that could be added to OSM database, but it just doesn't make any sense to add it since nobody can guarantee that it will be up to date and more or less accurate/complete. Here, I'd suggest using another OSM principle that usually refers to new tags: "don't propose (here - don't add) anything that you aren't going to use (here - to keep up to date) by yourself".

Update from Amazonia

Posted by Diego Sanguinetti on 29 March 2017 in English (English)

Hello everybody. I just mapping in Peru for add jungle and river via Bing satelite. This to monitor some weather event Also, this help to the citizens for disaster prevention.[1]

Thank you for considering the note. [1] http://unasolafuerza.pe/

P.S.: Sorry for mapping in Brasil, too.

Location: Francisco de Orellana, Maynas, Loreto, Peru
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