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Previous: Generate Contour Data from Points|Next: Mathematical Transformation of Raster Data
In this tutorial,you will learn how to create contour lines using the ContourGenerator and a Digital Elevation Model (DEM).The ContourGenerator in FME constructs a Delaunay triangulation based on the input value of the raster cells which are then used to generate contour lines.
generate-contours-from-raster.fmwt
In this scenario,you will create contour lines from DEM because you want to create a 50m contour dataset for later use.
Leave all other parameters as default,then click OK to accept the changes to the ContourGenerator Parameters.The ContourGenerator Parameters dialog should look similar to the one in the screen capture provided below:
Note: the default dimension of the output of the ContourGenerator is 3D.
The purpose of this transformer is to combine paths to have one record per Path ID rather than having segmented contour lines.
Note: In order for lines to be combined,they must meet at the exact same start/end point.Additionally,lines will remain broken at points where three or more lines converge.For more information see theLineCombiner Documentation.
Data used in this tutorial originates from open data made available by theCity of Vancouver,British Columbia.It contains information licensed under the Open Government License - Vancouver.
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