OpenStreetMap

maxerickson has commented on the following diary entries

Post When Comment
Imports about 13 hours ago

I've come to look at the import process as an up front quality control step. Of course quality assurance could be done by finding problems with imports and then handling the problems (either by removing and redoing or by fixing the data directly), but that pushes the QA work from the people who believe the new data will improve the map off onto whoever happens to look for and notice the problems.

In this case, one thing the import process probably would have raised is that the county has parcel data with addresses and property use information (the property use is shown in the "Class Code" field at http://ccgisapps.charlestoncounty.org/public_search/ ). For a lot of data users, the address information is more interesting than the building footprints, and some effort to set a more specific value than building=yes is always nice.

Forest Service Road notes 20 days ago

It's likely necessary to use a command like ogr2ogr /share/gis/extracts/test.shp /share/gis/USFSOsm/ -clipsrc -85.2 46.2 -84.5 46.6 to clip out a smaller region of the OSM tagged shapefile, JOSM doesn't seem to do all that well trying to load the whole file.

Forest Service Road notes 21 days ago

As Jack the Ripper says in the diary entry, many roads in US National Forests are built to provide access to a point of interest and will be maintained for use by passenger vehicles. These are sensibly classified as highway=service.

Forest Service Road notes 23 days ago

This matches up well with what I've done with a nearby area of national forest: http://www.openstreetmap.org/#map=10/46.1313/-86.5482

I haven't made an explicit effort to ground check much of it, but I've crossed checked it with USFS data. There is a imagery layer that available that shows the USFS data:

http://www.openstreetmap.org/user/Richard/diary/26099

Though I've found it more useful to get the source data from https://data.fs.usda.gov/geodata/edw/datasets.php and load an extract of it into JOSM, after adding some OSM tagging ( https://gist.github.com/maxerickson/32ca41e72458b12a5734f97f75800448 ) to get nicer styling.

Are maproulette challenges undiscussed mechanical edits? 5 months ago

mvexel, could you explain how to find the challenge creator on MapRoulette?

I can't work out how to do it.

Introduction 5 months ago

There are several messaging systems for OpenStreetMap.

Part of participating in the community is doing your best to respond to messages, as messages from other users are one of the main ways of giving feedback and resolving questions about what an edit means.

What shall we have for diner tonight? 6 months ago

In the US we have many fast food restaurants that do not serve burgers; tacos, chicken, sandwiches and various Asian fusion places are some big categories.

As to the broader point, if the cuisine tags in an area are incomplete or too messy to use, ignoring them is just as effective as not storing them.

Easy Access to United States NAIP Imagery for JOSM 6 months ago

Glassman, did the "Set WMS Bookmark" method mentioned on the github.io page not work?

Easy Access to United States NAIP Imagery for JOSM 6 months ago

Hi Glassman if you go to the linked github.io page, from there you can click one of the links like 'Alabama_2015_1m' to add the NAIP layer for that state in JOSM.

POI standardization: Tractor Supply Co. 6 months ago

In the Midwest we also have Mills Fleet Farm and Blain's Farm & Fleet (both modest sized chains). There's a Wikipedia category: https://en.wikipedia.org/wiki/Category:Farm_and_ranch_supply_stores_of_the_United_States

POI standardization: Tractor Supply Co. 7 months ago

Sure I understand the desire to capture that it has lots of pet related merchandise.

The downside is that most data consumers will not interpret the tag at all if there is a semicolon. I guess given the low usage to date of farm_supply it doesn't make much difference.

POI standardization: Tractor Supply Co. 7 months ago

Is there a reason to double up phone and website? I think using one scheme or the other is sufficient and makes updates easier. Maybe not an issue for a single chain, but I think using both shouldn't be encouraged as a general practice.

(in my opinion all the "contact:" scheme really adds is 8 characters, but it isn't worth much arguing, it's trivial for data users to consume all the various tags).

I would also give some consideration to shop=farm_supply without pet, shop is a key where multiple values don't make sense to me. It's been a while since I was in one, but I guess TS isn't anymore of a pet store than say Walmart. Maybe pet=yes or petfood=yes to capture that part of the business?

New data sources available for Western Australian roads 8 months ago

With the OpenData plugin you can open shape files directly in JOSM:

https://wiki.openstreetmap.org/wiki/JOSM/Plugins/OpenData

(The result should be about the same, I'm thinking the installation process for the plugin is a lot easier than gdal)

On the corner of $FIRSTNAME and $LASTNAME 9 months ago

CSV output is handy for this type of Overpass query:

http://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL#Output_Format_.28out.29

Cleaning up the streets. 10 months ago

A while later a different way of finding the mixed character names occurred to me. Look for names that have characters in a-z and also not in a-z.

http://overpass-turbo.eu/s/jC1

[out:json][timeout:25];
way["highway"]["name"~"[a-z]",i]["name"~"[^a-z0-9 \.-]",i]({{bbox}});
out center;
label weight 11 months ago

@BushmanK the boundary relations don't factor into the label placement or sizing.

I do see population data on the place nodes.

http://www.openstreetmap.org/node/151538698

http://www.openstreetmap.org/node/151370941

UK Unadopted Roads - What are the Accepted Mapping Keys? 11 months ago

It may be a good idea to revisit that diary entry.

For instance, you can check what tags are considered by some open source routers.

Here are two that don't consider it at all:

https://github.com/Project-OSRM/osrm-backend/blob/master/profiles/car.lua

https://github.com/osmandapp/OsmAnd-resources/blob/master/routing/routing.xml

I would be surprised if many routers would take the tag into account, as they look directly at the connectivity between the roads, and a road having a single connection is a common and simple situation.

Using https://www.google.com/search?num=20&q=site%3Ahttp%3A%2F%2Fwww.openstreetmap.org%2Fuser%2F+noexit%3Dyes to search, I only find a couple of entries, one complaining about the tag being added to ways.

http://www.openstreetmap.org/user/AndiG88/diary/35085

TIGER Review 12 months ago

You can use Overpass Turbo to generate a gpx file showing OSM objects with a certain tag. For example, here's tiger:review=no:

http://overpass-turbo.eu/s/i7W

I've used out center to simplify the streets to single nodes. To get a gpx, click the export button.

Spotting Cemeteries in Texas 12 months ago

Not with much certainty. I guess marking the locations where a cemetery is clearly visible would work well.

I looked at a few of the locations in the challenge. This one:

http://maproulette.org/map/85/84564

Doesn't really look like a cemetery, but I think it is quite likely that the untilled area by the junction just to the southwest is a cemetery (there's also a hint of a fence).

Spotting Cemeteries in Texas 12 months ago

I wouldn't rule out the patch of grass being a cemetery. An older cemetery may have only had small or temporary markers and they often go untended.