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DaCor's Diary

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tl;dr follow me on snapchat to see what the #MapLesotho folks get up to. Same as my twitter - dacor_ie

Very shortly I will be heading back to Lesotho for 2 weeks with DebigC and RustyB as part of #MapLesotho which is being supported by Action Ireland Trust and Fingal County Council.

This will be the final trip so during our time there, the activities will be much more focused on the long term sustainability of the project. Some of our main goals will be

  • Increase the general level of expertise (think: relations etc)
  • Data curation (KeepRight, OMSI etc)
  • Data analysis (Overpass, QGIS)
  • Train the trainer
  • Growing the community

We’re also planning a monster Mapillary drive while we’re there so I’ll be including many photos and videos of Lesotho itself. You can see some from last years trip here

We will also have Oscar from Mapillary coming along to give a masterclass or two on using Mapillary.

If you are in anyway curious about what we’re doing, I’m going to be using snapchat a lot while I’m there, in particular, creating ongoing “stories”. These will feature snippets of the training, photos, interviews etc (though Im not sure how well the interviews will work given the limitations of snapchat) but it will also feature some of the downtime and general chats among the #MapLesotho folks. I’ll be talking to a lot of the local mappers and covering some of our trips to govt agencies as we look to get data released for use in OSM.

If there are questions you’d like to see answered, I’ll be taking those also. I have a list of questions myself, but it would be great to hear from others as there will be many things I simply won’t think to ask about.

So yeah, follow me if this interest you :)

snapchat username is dacor_ie

Its nearly a year since I started working with Fingal County Council on the #MapLesotho project and in that time a number of great milestones and activities have been completed so of which are:

  • Last July a huge mapathon with users from around the world added over half a million nodes of data for Lesotho
  • In Sept we had a mapping party in the Lesotho Embassy in Dublin with the Irish OSM community

Irish OSM community mapping in Lesotho Embassy in Dublin

  • A dedicated website has been setup -
  • A series of classes where held with school children in Dublin teaching them to map and getting them involved in #MapLesotho

Fingal Council & Irish OSM members teaching in a Dublin school

A number of Irish OSM members / Fingal County Council staff are heading to Lesotho for 2 weeks from Feb 06th to 20th to work on the following:

  1. Get the local mappers (there are quite a few now) more involved, editing more frequently and start discussions about them forming a Lesotho OSM group with semi-regular meetups
  2. Train govt. planners (most are mappers) on the use of JOSM and OSM data with QGIS
  3. Conduct a number of mapping sessions at the national university
  4. Meet with govt. data owners to talk about release of (i) data to OSM for imports and (ii) permission to scan, recitfy and derive info from existing maps

We’ve still got 2 tasks running in the HOT tasking manager since last July’s mapathon which we’ve been silently tipping along on.

With all of this in mind, a number of the folks in Lesotho have set next Friday Jan 16th as a date for the next #MapLesotho mapathon. A large group are coming together in Dublin in the Fingal Council offices to carry out a supporting mapathon.

MapLesotho Poster

We are looking for other groups around the world to again join in with us in our mapathons.

  • Organise you own mapathon / mapping party
  • Although it would be nice, it doesn’t have to be on the same date so chose a date that suits you
  • Promote #MapLesotho among your local OSM community. Drop a mail to your local mailing list or see if there are a few folks meeting up, they might like to work on this at their meetup
  • Join in anytime! The 2 tasks listed above have been running since July so feel free to just jump straight in and take a tile or two.

when I copy the html and paste it into a page, I only get a zoom 1 view, not the view I was looking at when I opened the Share sidebar

Surely this should be as simple as copy the code and paste it in

This is not an issue on my side either as I embedded both mapbox & stamen maps to make sure and they work fine

Anyone know the github for this sort of stuff, I’d like to raise an issue

A tremendous amount of work was completed yesterday so I want to say thank you to all

Over the course of the day, we had 106 people create over 220,000 nodes of new information for Lesotho

There are many, many half-completed tasks where people finished up for the day but did not finish the task they were working on.

These are mainly on the urban task on the HOT tasking manager so I would urge people to head on over to the tasking manager, take a task (especially where you see cities/towns nearly complete) and start mapping to help us finish off these tasks.

Alternatively, an even easier, quicker, less intensive task that is available is the rural task where a great many tiles were completed but due to the size of the task it looks like a drop in the ocean.

Take a tile or two and help create a data for Lesotho

So after 2 months of prep, several hundred tweets, emails and facebook posts we’re finally here!

Today is #MapLesotho day!

There are mapping parties happening in:

  • Lesotho (2 locations)
  • Ireland
  • Poland
  • Germany
  • USA
  • Canada
  • UK

To help out, go to either the urban or rural mapping task, take a tile and start mapping.

Its been a busy few weeks since we kicked off plans for the #MapLesotho and there has been a lot of activity going on since my last diary post.


Plenty of activity and support showing up for our hashtag #MapLesotho with lots of people supporting this activity

International #MapLesotho Mapathons

  • Maseru, Lesotho - Regional planners and local OpenStreetMap members will be having their Mapathon at a location to be confirmed
  • Medialab Katowice - In conjunction with OpenStreetMap Poland, are having an event
  • Fingal Council - Irish OpenStreetMap members in conjunction with Fingal Council will be having a mapathon on 25th July in the County Hall in Swords, Dublin
  • Munster, Germany - A group of students will be hosting their own mapathon, again at a location to be confirmed

Individual Mappers Taking Part

There has been a fantastic response with mappers from Sweden, Denmark, Finland, Germany, Canada, Ghana, India & Japan all signing up on an individual basis to take part.

Current Tasks

If you would like to assist, but will not be able to do any mapping on 25th July, there are currently 3 open tasks for mapping Lesotho cities Hlotse, Mafeteng and the northern part of the capital, Maseru. Please feel free to take a tile and participate in those tasks.

Spread The Word!

We would ask that people please spread the word for this mapathon as we hope to map large portions of Lesotho during it and simply put, we need a lot of people to do it.

If you wish to spread the word, please use hashtag #MapLesotho and shortlink

I’ve been working with some of the guys in Fingal County Council over the last few months on getting OSM going in Lesotho in Africa.

As part of this we are organising a ‪#‎MapLesotho‬ mapathon


25th July 2014


A Mapathon is a coordinated OpenStreetMap indoor mapping event run in various places at the same time.


In conjunction with Action Ireland Trust, a number of Irish OSM members from Fingal County Council traveled to Lesotho for a number of weeks in early 2014 to assist and train regional planners in utilising OSM data.

Another group are planning to travel in early 2015 with the following objectives as part of their visit:

  • Create an OSM community in Lesotho by engaging with local communities and providing training and guidance on surveying and updating OSM
  • Create a basemap of the country for use by all
  • Create an evidence base for decision makers


There will be 2 main tasks created, the first, to map all the buildings, roads, major features etc within larger urban areas. The second task will involve identifying rural settlements and the main routes in and out of those settlements and any major features nearby e.g. rivers.


This mapathon is being organised by Irish OSM members in conjunction with Lesotho members.

We want to have as many people as possible attending the mapathon on 25th July…….many hands make light work.

There are mapathons planned in Lesotho, Ireland, Germany and elsewhere all on the same date so come be part of a truly collaborative effort

Spread The Word

If you are letting people know about the event, use hashtag #MapLesotho and shortlink

iD Newbie friendly feature request

Posted by DaCor on 8 February 2014 in English. Last updated on 9 February 2014.

A thought occurred to me a few days ago while using iD in work….

“If I was a new user and needed help what would be the fastest way to get that help to keep me interested in editing?”

As with my Local Chapters V2.0 diary post I’d like to preface the following by saying I do not have the necessary skills to implement what I am about to propose but I would hope that this post will prompt someone with those skills to run with this.

What I think might possibly address my original question above would be real-time 1-on-1 help.

The best way I see of doing this is by adding functionality to iD which would do the following

  • New user clicks a “Get real-time assistance” button
  • In IRC, in the main channel and applicable regional channel (if one exists) osmbot would announce to the channel that “User XXXX is requesting editing assistance in #osmhelp channel”
  • Anyone can then click on the #osmhelp channel name to join it and provide help

As for possible issues with doing this:

  • Why not send them to #osm?’

Simply because when its busy in there it can be very difficult to follow a conversation. In addition with all the techy chat that goes on in there (not a bad thing) it may be a little intimidating for new users

  • Why also announce to a regional channel?

Should mitigate against language barriers

  • What if nobody answers them, it will look bad on OSM?

The topic of a chatroom is the first thing someone sees when they enter a chatroom, adding a disclaimer to the topic along the lines of “Openstreetmap is run by volunteers so it may be a while before your query is answered” or something like that.

  • Is something like “really” needed?

Thinking back to when I first started editing. The very beginning was very frustrating but through a local site I posted about the issues I was having and was given the #osm-ie details. Within minutes of joining that chatroom I was flying and best of all, everytime I had a question about something, it was answered very quickly. If it wasn’t for the help I received that first day I would, in all likelyhood, have given up on OSM.

For the TL;DR crowd, the basis of the following lays out what I feel should be achievable in providing a standard starting point to creating local chapter portals within the OSM ecosystem while at the same time allowing more active chapters to flourish externally but benefit from tools available to all. i would like to preface this with an acknowledgment that I do not have the necessary technical skills to create what i am about to propose, but maybe it might spark somebody into following through on even some aspects of this proposal. The idea behind this is to keep it as simple as possible for new members to tie in with existing members from their country / region. For myself, personally, I only got as involved as I did due to the fact of the #osm-ie Irish IRC channel where I got a lot of real-time assistance.

There are a handful of strong OSM local chapters around the world, a sprinkling of inactive or dormant local chapters and a gaping hole where no local chapters exist at all in any form despite there likely being some active OSM members from every country in the world.

I propose to change this using the starting point of account creation on

How I envisage this working is upon joining, more emphasis is put on the new member placing a “home location” marker. The small print at this point can state that it does not need to be their actual “home”, but rather it can be a generic location like the city centre or a local monument if they so wish. Benefits of placing a home location marker should also be outlined at this point as:

  • Automatic access to region / country specific local chapter (more on this later) etc
  • Country/region specific statistics

Once new member registration is complete, they are presented with an option to edit the map, but there is an additional option to “access openstreetmap local chapter for your area” which will open a new window, the chapter portal.

The chapter portal will contain several simple indicators for that chapter, these would be simple active/inactive indicators to show which of the following are in use:

  • IRC related, i.e the chapter maintains an IRC channel (#osm-gb, #osm-ie etc) with a link to a browser based IRC client (keep it simple, don’t involve IRC clients at this stage) which would ideally open with the chapter portal as a wrapper around the IRC chat window. This could be changed in preferences to open in a new window, or open client.
  • Mailing list, same as IRC above (it would be good if signing up for mailing lists be simplified/streamlined to allow for one / two click sign-up)
  • Mapping parties, can link to an external site like event brite, meetups etc or be an integrated part of the portal showing the the next / previous meet ups.
  • National page on the wiki
  • A chapter forum. Ideally this would be integrated into the chapter portal rather than linking out to the existing osm forums unless they could be configured to allow the portal to act as a wrapper.
  • Lastly, stats! Various national stats incorporated into the portal (see, etc for examples)

I am sure there are a load of improvements that could be made to the above, however it would be a good starting point by which to tie new members into their local community and increase active contributors.

I do not see this as taking over from external sites that have been developed by certain chapters, rather, in those cases, this would act as a “first contact” location for new contributors.

I look forward to discussing this and many other things, with SOTM folks over the next few days

The stars have aligned to allow me a full weekend next week (29th & 30th Mar) of surveying in my city and I am planning on using it to gather as much address data as humanly possible for the west side of the city including the suburbs.

However, I need help adding buildings to allow for easier and more accurate surveying. The main reason is due to weird numbering in many areas where houses/businesses can be numbered as 1, 2, 3, 3a, 3b, 4a, 4, 5. When numbered like this it can be difficult to accurately map everything quickly. As an example, a few days ago I was able to gather data for over approx. 1,000 homes in just over 2 hours where the house numbers were not in a strict sequence simply because I had building outlines to tie everything to.

I have set up a job using Mapcraft to split up the task. If you know how to use MapCraft you do not need to read any further, just grab a slice and start adding buildings (pretty please) ;)

If you have never used MapCraft before, I have written a step-by-step guide on how to go about using it in conjunction with JOSM. To log into MapCraft, first, log into OSM as you would normally do, then click here to take you to the main MapCraft page. Hit login in the top right and allow it to link to your OSM account.

Firstly, you need to make sure you have remote control turned on in JOSM , here’s how to do it:

  1. Go to Edit -> Preferences or press F12 to bring up the Preferences window
  2. Click on the remote control icon
  3. Select “Enable Remote Control” and click OK.

Next, go to my MapCraft job. You will see the following screen:


MapCraft Walk-Through

  1. Cake: Turn on/off the cake outline to switch between the cake slice view and the background map
  2. Settings: Adjust settings, default usually cover everything you need
  3. Info: Click here to see the Where / Why / How etc along with additional information and helpful links
  4. “The Cake”: Galway city (west) broken into “cake slices “ to allow for multiple people to edit the same area all at once without causing conflicts in the data. If you are editing a slice, its important you stick to your slice and don’t go outside the boundary of it.
  5. Owner: Click on a slice of the cake to select it, then click “Owner” to accept ownership of that slice. This prevents anyone else from working on that slice, again preventing conflicts in the data.
  6. Progress: As you edit, you can click on this to move a slider between 0-9 to indicate to others how you are progressing. The cake above shows slices in various stages of progress from not started to completed.
  7. Comments: Add a comment here (8) for a slice you are working on if you think it needs one. This can be used to highlight issues to other mappers if you release the cake slice to allow someone else to edit it. To add a comment, first you must click the number of the slice beside your name in the Users box (10). Once you type your comment and click “Add” it will show in the Comments box (7).
  8. See 7
  9. Remote: Click this button, it will load your cake slice directly into JOSM for you to begin editing, Note: It loads as a square area, not the exact same shape as the cake slice. Once your data has loaded in JOSM, on MapCraft, click Info (3) and click the “Remote” button beside the first link (WMS layer for editors). This will load the outline of the cake for you in JOSM so you can make sure you stay inside your cake slice until you are ready to claim another slice.
  10. Users: List of all users using this mapcraft job and a list of the slices they have claimed ownership for.
  11. Chat: Exactly what you think it is, a simple window to chat, or leave messages for other users. You can view the full chatlog by going to Info (3) and clicking on the second link (Cake Chat Log) to read back through previous conversations relating to the area being mapped.

Editing in JOSM – Showing cake slices to prevent data conflicts

When you load a slice in JOSM using the remote button (9) you will see something like the image below. It is essentially a bounding box encompassing the cake slice, but it also includes data from outside the slice so you can not just start editing. The image below only has a single layer (12) at present


Before you start editing, you need to need to get the cake slice information which will show you, in JOSM, the boundary of your cake slice. To do this, in Mapcraft, click Info (3) and click the “Remote” button (13) next to the WMS layer For Editors link.


This will add a new layer called Mapcraft-cake-223 (12) to JOSM showing the boundaries of the cake slice, in this case, cake slice # 14.


This can be toggled on/off by clicking the eyeball (14) next to the layer name.


Next, add your imagery layer using the imagery menu. This will add an additional layer (12) for, in this case, Bing imagery.


However, now you need to move the Mapcraft-cake-223 layer above the Bing imagery layer using the blue arrow (15) so that everything is visible all at once, openstreetmap data, cake slice outlines & imagery.


Now JOSM should look like this


You can see a number of building outlines have already been added inside your cake slice but there are still a few missing at the bottom of the cake slice (highlighted)

Some are inside the cake slice boundary (16), these are safe to edit (17) and some are outside the cake slice (18). These should not be edited by you as another person may be editing that cake slice. If you both trace the same building it can cause conflicts or map errors, as in 2 buildings sitting on top of each other.


That’s it, I hope this has been of some use and if you would like to show some love to Galway City I would be very grateful as it will make my surveying much more effective next week with the end result looking something similar to this area which I surveyed a few weeks back.

Location: Townparks, Saint Bridget's Terrace, St Nicholas, Galway, County Galway, Connacht, Ireland

Adding Addresses

Posted by DaCor on 22 February 2013 in English. Last updated on 23 February 2013.

Over the last month or two I’ve started to put more time into adding addresses in residental areas in my local area and according to Pascal Neis’ great site, I have over 2,000 pieces of address data added since the beginning of the year. At this rate, by the time I’ve finished with my small city I will probably have over 100,000 pieces of address data added.

Here’s the kicker though, until recently I was not aware of the importance/relevance of address data in OSM and I’ve done A LOT of mapping of the last 13 months.

Initially when I started I used my Android phone and Vespucci which has been my weapon of choice while out and about however for this kind of detail I found it too awkward and tried out a few other apps. I tried Keypadmapper and OSMPad and in the end settled on OSMPad simply because I could see exactly where on the map I was placing the address marker as I can’t always maintain GPS lock. The ability to cache maps was also appealing for areas where there was a poor data connection.

How I gather my address info now is in 3 stages:

  • I add the buildings first(adding addr:street),
  • then go survey,
  • then dump the traces I’ve collected into JOSM and add details to all the buildings (addr:housenumber).

There are 2 additional benefits/side effects of doing it this way.

First, it is forcing me to go back over every single street, road, alley, walkway etc in my city and I am refining alignment, adding missed details (street lighting, speed bumps, stop signs etc) and generally improving every square inch of the map for my city.

Second, I am revisiting all of these areas again for a second time, however, where previously I would have just gotten the name of a housing estate from a sign at the entrance and moved on to the next one, I am now going INTO every estate and surveying all of it and finding

  • other estates/apartments tucked in the back that are not signposted at the main entrance
  • house names
  • guest houses
  • small businesses run from the home

Hopefully this post can help others to get started on this. Its not a bible on how to do it, merely a few pointers on how to get started

Galway City