#168 - Toronto Building Simplification

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The main goal of this project is to simplify buildings imported during the Canada Building Import.

The tasks vary widely in geographic size but each requires roughly the same amount of simplification based on the estimated number of nodes to be deleted. This means that geographically smaller tasks are much more targetted and should be more rewarding to work on. The largest tasks require little or no simplification and are generally too large for a single user to manage. Please save the big tasks for a later stage in the QA process.

TLDR: do the smallest tasks first

You are also encouraged to do other types of quality assurance while editing such as:

  • better aligning buildings with imagery and surrounding features
  • orthogonalizing features
  • splitting attached buildings along party walls
  • etc.


Created by Nate Wessel - Updated - Priority: medium

  Instructions

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

This project requires the use of JOSM's SimplifyArea plugin. To install it, open JOSM and click Edit -> Preferences -> (plug icon) -> search for 'simplify' -> check the box.

The new plugin can be used by pressing ctrl + shft + y after selecting one or more polygons. The building simplification tool (ctrl + y) is too aggressive for use on most buildings.

For buildings which look like they should be square, you may want to use the "orthogonalize shape" tool as well (keyboard shortcut 'q'). If you do this, you may want to simplify again after squaring.

If imagery is good in the area you are editing, you may wish to align the buildings with imagery and surrounding features. You'll notice that some building footprints are already outdated, especially where homes have been expanded by additions or where the original source imagery may have been of low quality. You are encouraged to retrace such buildings as part of this project, or perhaps to flag them for late with a fixme=* tag.

  Start contributing

Contributors Done Assigned