![]() This program is used to create digital terrain models (DEM, DTM) from inputted points and holes. ![]() This method served to round the floating point values to the closest integer. Version GEO5 - Digital Terrain Models Software. The data could be visualised in 3D with the Virtual Terrain Software. The integer version of the final layer was produced from the floating point raster by adding 0.5 to each pixel's elevation and then truncating each floating point value with the Grid function INT (). Download SRTM Data The data could be downloaded under the Open Database License (Timestamp 3/2011). The lattices were then merged into statewide datasets and imported into an ArcSDE raster dataset. This process allowed all off-shore areas to be coded as NODATA. ![]() To produce a continuous coastline, the outermost breaklines from the Topographic Breaklines layer were appended and edited into polygon coverages, converted to Grids, and used the in the SELECTMASK () Grid function. Lattices - raster surface models with a regular array of cells - were created from the TINs with the TINLATTICE command. Breakline and mass points as coded in the DTMs were incorporated into the TINs. ![]() MassGIS used ESRI's ArcInfo Workstation software to produce TINs (triangulated irregular networks) from each DTM file (based on the Orthophoto Quad index) using the CREATETIN command. ![]()
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