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Harris Geospatial / Docs Center / Using ENVI / Raster to Vector

ENVI

Raster to Vector

Raster to Vector

Use Raster to Vector to create a vector layer for a specified DN contour value in a raster image.

  1. From the Toolbox, select Vector > Raster to Vector. The Raster to Vector Input Band dialog appears.
  2. Select an input file and perform optional spatial subsetting, then click OK. The Raster to Vector Parameters dialog appears.
  3. Enter the DN Value to use as a contour value.
  4. Enter an ENVI vector file layer name in the EVF Layer Name field.
  5. Select output to File or Memory.
  6. Click OK. ENVI makes a polygon vector layer using the entered DN contour value, and a vector attribute file (.dbf) containing the class ID, polygon length, and area information for the resulting ENVI vector file. The resulting output is added to the Available Vectors List.

Note: The vectors appear to be shifted one half pixel to the Southeast because ENVI interprets the map coordinate of the vector node to be the upper left hand corner of the raster pixel (versus treating the address as the center of the pixel).



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