I’ve begun to add sidewalks in Swissvale Borough.

This is my current methodology (just putting this somewhere so I can reference it later, and adapt to new information/methodology when necessary):

1. add longest section of sidewalk possible (using clearest aerial imagery available, when in doubt, crosscheck with others; using PEMA, Esri, Bing for the most part), tag surface and smoothness where appropriate.
2. add pedestrian crossing across intersecting ways, tag surface and markings.
3. add crossing for intersecting ways (when prompted), tag surface and markings.
4. tag all corners appropriately (curb height, wheelchair access).
5. verify the above using street-level imagery and in-person surveys when possible.
6. change tag for adjacent streets to sidewalk=separate to indicate that the sidewalk is mapped separately.