#19 - London Buildings

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Project to draw buildings and housenumbers to London using the 1940s-1960s OS "Town Plan" of London Imagery. This imagery is freely availble courtesy of National Library of Scotland (NLS).

Please read the instructions carefully before contributing. Otherwise you could contribute data to OSM that is incorrect.


Created by IpswichMapper - Updated - Priority: high

  Instructions

Entities to Map
buildings
Changeset Comment
#tasks-osmch-project-19 #london-buildings
When saving your work, please leave the default comment but add what you actually mapped, for example "added buildings and a residential road".

Select a task you want to map.

1) Firstly, make sure that you split the task. (Unless it is an very rural area). Most of these tasks are in dense urban areas, meaning it is nearly impossible to map tasks that are this huge. You will likely need to split a task multiple times before it becomes a maneagable size.

2) Open the task preferably in JOSM. You can use iD, but this will be much, much slower, and you can't use plugins to speed you up such as the terracer plugin. Switching between imagery also becomes difficult.

3) Add a bing imagery layer. This is far easier in JOSM. Add this bing imagery layer underneath the Ordanance survey imagery layer that has been loaded. The purpose of this is to check if the building shown on the NLS imagery still exists. If the bing imagery shows a different building, that means that the building has been demolished & new construction has taken place.

4.1) This is if you are using JOSM (check instruction 4.2 for iD information).

Map buildings. Make sure to see if the building still exists in Bing imagery before tracing the building from the NLS imagery. If the NLS imagery does not show the building, it is a good idea to map the buildings anyway using Bing imagery. (mark them as building=house if they are houses or building=flat if they are flats). Make sure to map each individual house in a terrace as one building outline (terrace plugin is useful for this).

Here is a detailed guide on how to quickly draw buildings in JOSM

Please follow this guide for adding buildings. Some examples of things that need to be done while drawing buildings (this is covered in the guide):

  1. mark houses as building=house
  2. split terraces and semi-detached houses using the terracer tool.
  3. add a addr:street tag to the house (unless it is unclear what street the house is on).

4.2) This is if you are using iD.

If you are using iD, draw a rectangle for each building.

Then, select "house" from the search menu to mark it as a house, and add then add the street.

If you are drawing a terrace, make sure to points of houses next to each other connect. Once you have drawn a whole terrace, select each house and square them (shortcut: "Q").

5) Drawing extrusions/extensions of a building isn't necessary.

This is an extremely slow process, and it takes significantly more time than drawing the main rectangular building. This will slow you down quite a bit. If you want to do it, then that is your choice. Tools such as the "Extrude tool" are in the JOSM building guide (linked in instruction 4.1) and it describes how to draw extrusions.

6) Make sure to describe what you have done in your changeset comment. (Some hashtags are automatically added, but this is not enough). For example, you might want to add what area you mapped a task in.

  Start contributing

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