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Terrain Analysis
Use this component to perform the following terrain analysis types:
-
- Slope
- Grade
- Aspect
- Elevation
- Visibility
- Hillshade
- TRI (Terrain Ruggedness Index by Riley)
- TRI categories (Terrain Ruggedness Index categories by Riley)
- SRF (Surface Roughness Factor by Hobson)
- TPI (Topographic Position Index)
- Mean curvature
------
Component mainly based on:
"DEM Surface Tools for ArcGIS", Jenness Enterprises, 2013.
"How Hillshade works" article from Esri Developer Network
"How to calculate Topographic Ruggedness Index in ArcGIS Desktop" article from gis.stackexchange.com
"Terrain Roughness – 13 Ways" article from gis4geomorphology.com
TopoToolbox "roughness" function by Wolfgang Schwanghart
-
http://www.jennessent.com/downloads/DEM%20Surface%20Tools%20for%20ArcGIS_A4.pdf
http://edndoc.esri.com/arcobjects/9.2/net/shared/geoprocessing/spatial_analyst_tools/how_hillshade_works.htm
http://gis.stackexchange.com/a/6059/65002
http://gis4geomorphology.com/roughness-topographic-position
https://github.com/wschwanghart/topotoolbox/blob/master/@GRIDobj/roughness.m
-
Provided by Gismo 0.0.3
Inputs
| Name | ID | Description | Type |
|---|---|---|---|
| Analysis Type | _analysisType | Choose one of the terrain analysis types: 0 - Slope 1 - Grade 2 - Aspect 3 - Elevation 4 - Visibility 5 - Hillshade 6 - TRI (Terrain Ruggedness Index by Riley) 7 - TRI categories (Terrain Ruggedness Index categories by Riley) 8 - SRF (Surface Roughness Factor by Hobson) 9 - TPI (Topographic Position Index) 10 - Mean curvature | Goo |
| _______________ | Script variable TerrainGenerator2 | Goo | |
| Terrain | _terrain | A terrain surface or polysurface. Add it by supplying the "terrain" output from the Ladybug "Terrain Generator" or Gismo "Terrain Generator" components. - It needs to be a surface. So set the: "type_" input of the Ladybug "Terrain Generator" component to "1" or "type_" input of the Gismo "Terrain Generator" component to "2" or "3" | Goo |
| Origin | _origin | An origin (point on a "_terrain") of the upper "_terrain" input. Add it by suppling the "origin" output from the Ladybug "Terrain Generator" component. or Add it by supplying the "origin" output from the Gismo "Terrain Generator" component. | Goo |
| Elevation | _elevation | Elevation of the upper "_origin". Add it by supplying the "elevation" output from the Ladybug "Terrain Generator" component. or Add it by supplying the "elevation" output from the Gismo "Terrain Generator" component. - In Rhino document units. | Goo |
| Context | context_ | These are obstacles surrounding your location: houses, buildings, trees etc. For example, you can use 3d buildings and 3d trees generated by Gismo's "OSM 3D" component. - This input can not be included in the final "analysedTerrain" geometry for the following indices: TRI, TRI categories, SRF, TPI (_analysisType = 6,7,8,9) The reason for this is because these indices exclusively calculate terrain features. | Goo |
| North | north_ | Input a vector to be used as a true North direction, or a number between 0 and 360 that represents the clockwise degrees off from the Y-axis. - If not supplied, default North direction will be set to the Y-axis (0 degrees). | Goo |
| Sun Vector | sunVector_ | Illuminance source direction. This input is only used for _analysisType = 5 (Hillshade). - If not supplied, default sunVector of (0, 2.37126, -2.37126) will be used (an Y+ vector angled at 45 degrees downwards). | Goo |
| Hypso Strength | hypsoStrength_ | Hypsometric strength - a factor which determines shading factor's intensity due to elevation differences of terrain vertices. It ranges from 0 to 100. - This input is only used for _analysisType = 5 (Hillshade). - If not supplied, default hypsoStrength of 50 will be used. | Goo |
| Refine | refine_ | Refines the "analysedTerrain" output's mesh to finer resolution (halves the Maximum edge length of the "analysedTerrain" mesh). - Final "analysedTerrain" output is created with a certain mesh resolution. Depending on your terrain, sometimes a mesh resolution of higher precision is required. Be cautious !!! Due to "analysedTerrain" mesh increased number of vertices-faces, setting refine_ to True, can result in much longer component runtime !!! Still if your PC configuration is strong enough, you can always set this input to "True". Except for the _analysisType = 7 (TRI categories). In that case the refine_ input will not make any effect on the final "analysedTerrain" mesh. - If not supplied, the refine_ input will be set to False by default. | Goo |
| Legend Bake Par | legendBakePar_ | Optional legend parameters from the Gismo "Legend Bake Parameters" component. | Goo |
| _______________ | Script variable TerrainGenerator2 | Goo | |
| Bake It | bakeIt_ | Set to "True" to bake the terrain analysis geometry into the Rhino scene. - If not supplied default value "False" will be used. | Goo |
| Run It | _runIt | ... | Goo |
Outputs
| Name | ID | Description | Type |
|---|---|---|---|
| Out | readMe! | ... | String |
| Analysed Terrain | analysedTerrain | Analysed terrain mesh for the chosen _analysisType. | Goo |
| Values | values | Values corresponding to each "analysedTerrain" vertex, for the chosen _analysisType. | Goo |
| Origin | origin | The origin point of the "analysedTerrain" geometry. It's the same as "_origin" input point. - Use grasshopper's "Point" parameter to visualize it. - Use this point to move the "analysedTerrain" geometry around in the Rhino scene with grasshopper's "Move" component. | Goo |
| Title | title | Title geometry with information about the chosen analysis type and other inputs | Goo |
| Legend | legend | Legend geometry of the "analysedTerrain" output. | Goo |
| Legend Plane | legendPlane | Legend starting plane, which can be used to move the "legend" geometry with grasshopper's "Move" component. - Connect this output to a Grasshopper's "Plane" parameter in order to preview the "legendPlane" plane in the Rhino scene. | Goo |
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