Introduction
DEM: Digital Elevation Model; land surface elevation
Usage/purpose: slope, infiltration (qualitative; higher infil. where GWT is lower from surface), landslide potential, ...
Sources: ... // may skip
TIN: Triangulated Irregular Network
Three corners hold three elevation
Easy to interpolate
Tutorial
Data Import
- Search "excel to table" or ArcToolbox > Conversion Tools > Excel > Excel to Table
- Display XY Data from the generated layer
- Specify: X -> East; Y -> North; Z -> Height
- Coordinate not required now
DEM (3D)
- 3D Analyst Tools > Raster Interpolation > Topo to Raster
- Choose "Field" = "Height", "Type" = "PointElevation"
DEM (2D)
- Spatial Analyst Tools > Interpolation > Topo to Raster
Contour
- Spatial Analysis Tools > Surface > Contour
- Specify interval
3
Contour to TIN
- 3D Analyst Tools > Data Management > TIN > Create TIN
- Specify "Input Feature Class" = Contour_..., Height = Contour
DEM to TIN -> DEM > Contour > TIN
TIN to Contour
- 3D Analyst Tools > Conversion > From TIN > TIN to Raster
May choose different color ramp to better represent