How to compute residences within walking distance of significant usable public green: Difference between revisions
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{{editor steps|title=compute residences within walking distance of significant usable public green | {{editor steps|title=compute residences within walking distance of significant usable public green | ||
| | | [[How to make a Grid Overlay of residences| Create a Grid Overlay of residences]]. | ||
| Create a Grid Overlay which highlights which locations are to be considered "public space", such that:<br>Name: Public space<br>Locations which are not public have a value of 0.<br>Locations which are publicly accessible have a value of 1. | | Create a Grid Overlay which highlights which locations are to be considered "public space", such that:<br>Name: Public space<br>Locations which are not public have a value of 0.<br>Locations which are publicly accessible have a value of 1. | ||
| Add an [[Average Overlay]], configured so that:<br>Name: Green<br>Attribute to average is [[green space (Function Value)|GREEN_M2]]<br>Averaging distance is 0. | | Add an [[Average Overlay]], configured so that:<br>Name: Green<br>Attribute to average is [[green space (Function Value)|GREEN_M2]]<br>Averaging distance is 0. | ||
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| Add an [[Average Overlay]] configured so that:<br>Name: Environment of large green areas<br>Input is a Grid Input Overlay.<br>Input: The "1 hectare of green" Overlay.<br>Averaging distance is 80. | | Add an [[Average Overlay]] configured so that:<br>Name: Environment of large green areas<br>Input is a Grid Input Overlay.<br>Input: The "1 hectare of green" Overlay.<br>Averaging distance is 80. | ||
| Add a [[Combo Overlay]], configured so that:<br>Name: Large green areas<br>Input A: The "Public green" Overlay.<br>Input B: The "Environment of large green areas" Overlay.<br>Formula: AND(A, GT(B, 0)) | | Add a [[Combo Overlay]], configured so that:<br>Name: Large green areas<br>Input A: The "Public green" Overlay.<br>Input B: The "Environment of large green areas" Overlay.<br>Formula: AND(A, GT(B, 0)) | ||
| Add a [[Travel Distance Overlay]] configured using the wizard such that:<br><br>Input | | Add a [[Travel Distance Overlay]] configured using the wizard such that:<br>Destinations grid: based on grid overlay "Large green areas".<br>Destination threshold: 1.<br>Max travel distance: 290.<br>Distance to road: 30.<br>Traffic Types: Pedestrians, Bicycles, and Cars. | ||
| Add a [[Combo Overlay]], configured so that:<br>Name: Residences with green nearby<br>Input A: The "Residences" Overlay.<br>Input B: The [[Travel Distance Overlay]].<br>Formula: IF(EQ(A, 0), NO_DATA, GT(B, 0)) | |||
| Configure the legend of the [[Combo Overlay]] to have a distinct entry for the value "0" and the value "1". | |||
}} | }} | ||
Revision as of 07:15, 4 September 2023
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.
How to compute residences within walking distance of significant usable public green:
- Create a Grid Overlay of residences.
- Create a Grid Overlay which highlights which locations are to be considered "public space", such that:
Name: Public space
Locations which are not public have a value of 0.
Locations which are publicly accessible have a value of 1. - Add an Average Overlay, configured so that:
Name: Green
Attribute to average is GREEN_M2
Averaging distance is 0. - Add a Combo Overlay, configured so that:
Name: Public green
Input A: "Public space" Overlay.
Input B:"Green" Overlay.
Formula: AND(A, GT(B, 0)) - Add an Average Overlay, configured so that:
Name: Fraction of green nearby
Input is a Grid Input Overlay.
Input: The "Public green" Overlay.
Averaging distance is 80. - Add a Combo Overlay, configured so that:
Name: 1 hectare of green
Input A: The "Fraction of green nearby" Overlay.
Formula: MUL(A, MUL(POW(80, 2), 3.14159)) - 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" Overlay.
Averaging distance is 80. - Add a Combo Overlay, configured so that:
Name: Large green areas
Input A: The "Public green" Overlay.
Input B: The "Environment of large green areas" Overlay.
Formula: AND(A, GT(B, 0)) - Add a Travel Distance Overlay configured using the wizard such that:
Destinations grid: based on grid overlay "Large green areas".
Destination threshold: 1.
Max travel distance: 290.
Distance to road: 30.
Traffic Types: Pedestrians, Bicycles, and Cars. - Add a Combo Overlay, configured so that:
Name: Residences with green nearby
Input A: The "Residences" Overlay.
Input B: The Travel Distance Overlay.
Formula: IF(EQ(A, 0), NO_DATA, GT(B, 0)) - Configure the legend of the Combo Overlay to have a distinct entry for the value "0" and the value "1".
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.