How to compute residences within walking distance of significant usable public green

This article is a stub.

For the 3-30-300 guidelines, the rule indicated by the "300" is residences must be within 300 meters (walking distance) of accessible and usable green at least 1 hectare in size. This can be computed in the Tygron Platform by creating a determination of what green qualifies as accessible and usable green, where at least 1 hectare of such green exists, what green is part of that 1 hectare structure, and what routes towards that structure exists.

Editor → Current Situation (Ribbon tab) → Overlays (Ribbon bar)

How to compute residences within walking distance of significant usable public green:

1. Create a Grid Overlay which highlights which locations are to be considered "residences", such that:
   Locations which are not residential have a value of 0.
   Locations which are a residence have a value of 1.
2. Create a Grid Overlay which highlights which locations are to be considered "public space", such that:
   Locations which are not public have a value of 0.
   Locations which are publicly accessible have a value of 1.
3. Add an Average Overlay, configured so that:
   Name: Green
   Attribute to average is GREEN_M2
   Averaging distance is 0.
4. Add a Combo Overlay, configured so that:
   Name: Public green
   Input A: Public space Overlay.
   Input B:GREEN_M2 Overlay.
   Formula: AND(A, GT(B, 0))
5. Add an Average Overlay, configured so that:
   Name: Fraction of green nearby
   Input is a Grid Input Overlay.
   Input: The Combo Overlay made in the previous step.
   Averaging distance is 80.
6. Add a Combo Overlay, configured so that:
   Name: 1 hectare of green
   Input A: The Average Overlay made in the previous step.
   Formula: MUL(A, MUL(POW(80, 2), 3.14159))
7. Add an Average Overlay configured so that:
   Name: Environment of large green areas
   Input is a Grid Input Overlay.
   Input: The "1 hectare of green" Combo Overlay.
   Averaging distance is 80.

Notes

• If the Travel Distance Overlay does not properly calculate travel routes across certain Functions, such as bicycle paths or pavements, it may be neccessary to change the Function Values of those Functions, specifically the num bicycles and the num pedestrians.