Export DEM TIF File

This command creates a GeoTIFF DEM (Digital Elevation Model) file from a TIN file. The GeoTIFF DEM file is a geolocated TIFF file with one raster band representing elevation. The GeoTIFF DEM file is created by first creating a grid of "DEM Column Size" columns and "DEM Row Size" rows across the extents of the TIN (based on the TIN's x,y bounds). The center of each grid cell is sampled, and the elevation of the TIN at that sample location is used to produce a corresponding pixel in the output GeoTIFF DEM file. Geolocation information for the output GeoTIFF DEM file is based on the extents of the input TIN file projected according to the "Transformation Configuration" options.

Convert TIN to DEM file dialog:

Input/Output Options:
The "TIN File" "Set" button allows the user to select the input TIN file. The "DEM File" "Set" button allows the user to select the output GeoTIFF DEM file.

Transformation Configuration:
This column provides options for setting the projection that will be applied when geolocating the output GeoTIFF DEM file. This projection specifies how to interpret the extents of the TIN file.

• Projection Type: Specifies how to interpret/project the extents of the TIN when geolocating the output GeoTIFF DEM file.
  
• • None: No projection. The extents of the TIN will be used to geolocate the output GeoTIFF DEM file with no projection.
  • Lat/Lon: Use Lat/Long projection. The extents of the TIN will be interpreted as Lat/Long values.
  • UTM: Use Universal Trans Mercator (UTM) projection. The extents of the TIN will be interpreted as UTM values. UTM Zone can be set from the "Zone" pop list.
  • State Plane 27: Use State Plane 27 projection. The extents of the TIN will be interpreted as State Plane 27 values. State Plane 27 Zone can be set from the "Zone" pop list.
  • State Plane 83: Use State Plane 83 projection. The extents of the TIN will be interpreted as State Plane 83 values. State Plane 83 Zone can be set from the "Zone" pop list.
• Zone: Specifies the UTM, State Plane 27, or State Plane 83 zone depending on "Projection Type" settings.
• Units: Specifies the units for the output GeoTIFF DEM file.
  

Elevation Sampling Options:
The "DEM Column Size," "DEM Row Size," and "Null Elevation" options specify how the "Export DEM TIF File" routine should go about sampling the input TIN file.

• DEM Column Size: Specifies the number of columns that will be included in the sampling grid.
• DEM Row Size: Specifies the number of rows that will be included in the sampling grid.
• Null Elevation: Specifies the pixel value to be used in the output GeoTIFF DEM file if no elevation information exists at a geolocated pixel's sampling position on the TIN.