How to compute residential walls with sight of trees: Difference between revisions
Jump to navigation
Jump to search
(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...") |
No edit summary |
||
| (5 intermediate revisions by 2 users not shown) | |||
| Line 1: | Line 1: | ||
For the [[Demo 3-30-300 Project|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 | For the [[Demo 3-30-300 Project|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 sight-lines onto trees. | ||
{{editor location|Overlays}} | {{editor location|Overlays}} | ||
{{editor | {{editor steps|title=compute residential walls with sight of trees | ||
| [[How to add an Attribute to a Function|Add an Attribute to the Function]] of Default | | [[How to add an Attribute to a Function|Add an Attribute to the Function]] of Default Deciduous Trees, naming the attribute TREE_SIGHT_DISTANCE. | ||
| [[How to change Attributes for a Function|Configure the value]] of the TREE_SIGHT_DISTANCE of Default | | [[How to change Attributes for a Function|Configure the value]] of the TREE_SIGHT_DISTANCE of Default Deciduous Trees as "100". | ||
| Add a [[Distance | | Add a [[Sight Distance Overlay]], configured so that:<br>The [[Attribute]] it references is TREE_SIGHT_DISTANCE. | ||
| [[How to make a Grid Overlay of residence walls|Create a Grid Overlay of residence walls]]. | | [[How to make a Grid Overlay of residence walls|Create a Grid Overlay of residence walls]]. | ||
| Add a [[Combo Overlay]], configured so that:<br>Input A: The [[Grid Overlay]] of residence walls.<br>Input B:The [[Distance | | Add a [[Combo Overlay]], configured so that:<br>Input A: The [[Grid Overlay]] of residence walls.<br>Input B:The [[Sight Distance Overlay]] for the sight onto trees.<br>Formula: <code>IF(EQ(A, 0), NO_DATA, GT(B, 0))</code> | ||
| Configure the legend of the [[Combo Overlay]] to have a distinct entry for the value "0" and the value "1". | | Configure the legend of the [[Combo Overlay]] to have a distinct entry for the value "0" and the value "1". | ||
}} | }} | ||
| Line 16: | Line 16: | ||
* 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. | * 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. | * 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 | * At this time this calculation can only determine sight-lines to ''a'' tree, not necessarily to the prescribed 3 or more trees. However, in most urban environments trees exist in groups which can alleviate the discrepancy somewhat. | ||
|seealso= | |||
* [[Demo 3-30-300 Project]] | |||
}} | }} | ||
[[Category:How-to's]] | |||
Latest revision as of 13:31, 30 January 2024
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 sight-lines onto trees.
How to compute residential walls with sight of trees:
- Add an Attribute to the Function of Default Deciduous Trees, naming the attribute TREE_SIGHT_DISTANCE.
- Configure the value of the TREE_SIGHT_DISTANCE of Default Deciduous Trees as "100".
- Add a Sight Distance 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 Sight Distance 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 sight-lines to a tree, not necessarily to the prescribed 3 or more trees. However, in most urban environments trees exist in groups which can alleviate the discrepancy somewhat.