How to compute residential walls with sight of trees: Difference between revisions
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(Created page with "For the 3-30-300 guidelines, the rule indicated by the "3" is the ability to see 3 trees out of residential windows. This can be computed in the {{software}} by calculating the locations of residential walls, and the sightlines onto trees. {{editor location|Overlays}} {{editor location|title=compute residential walls with sight of trees | Add an Attribute to the Function of Default Decidious Trees, nam...") |
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| [[How to add an Attribute to a Function|Add an Attribute to the Function]] of Default Decidious Trees, naming the attribute TREE_SIGHT_DISTANCE. | | [[How to add an Attribute to a Function|Add an Attribute to the Function]] of Default Decidious Trees, naming the attribute TREE_SIGHT_DISTANCE. | ||
| [[How to change Attributes for a Function|Configure the value]] of the TREE_SIGHT_DISTANCE of Default Decidious Trees as "100". | | [[How to change Attributes for a Function|Configure the value]] of the TREE_SIGHT_DISTANCE of Default Decidious Trees as "100". | ||
Revision as of 12:39, 25 August 2023
For the 3-30-300 guidelines, the rule indicated by the "3" is the ability to see 3 trees out of residential windows. This can be computed in the Tygron Platform by calculating the locations of residential walls, and the sightlines onto trees.
How to compute residential walls with sight of trees:
- Add an Attribute to the Function of Default Decidious Trees, naming the attribute TREE_SIGHT_DISTANCE.
- Configure the value of the TREE_SIGHT_DISTANCE of Default Decidious Trees as "100".
- Add a Distance Sight Overlay, configured so that:
The Attribute it references is TREE_SIGHT_DISTANCE. - Create a Grid Overlay of residence walls.
- Add a Combo Overlay, configured so that:
Input A: The Grid Overlay of residence walls.
Input B:The Distance Sight Overlay for the sight onto trees.
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
- The resulting Combo Overlay has values of 0 where there are walls without sight of a tree, and values of 1 where there are walls with sight of a tree.
- Although the different steps in the calculation may produce coarse results, over a large scale the imperfections can balance out and the calculation as a whole can provide relevant insights into the compliance to the guideline.
- At this time this calculation can only determine sightlines to a tree, not neccesarily to the prescribed 3 or more trees. However, in most urban environments trees exist in groups which can alleviate the discrepancy somewhat.