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How To: Project a pseudocolor raster using ArcGIS and ArcInfo

Summary

Projecting a pseudocolor raster from one coordinate system to another can be done using the following steps.

Procedure

Verify that the raster is a pseudocolor by checking its properties in ArcCatalog. The number of bands must be 1 and a colormap must be present.

  1. Convert the raster to an ESRI Grid and a colormap file using ArcToolbox > Conversion Tools > Import to Raster > Image to Grid. Specify the name of the output grid and the name of the output colormap file.

    Note:
    The colormap file should have a .CLR extension.

  2. Define a projection for the grid using ArcToolbox > Data Management Tools > Projections > Define Projection Wizard such as coverages, grids, TINs.
  3. Project the grid using ArcToolbox > Data Management Tools > Projections > Project Wizard such as coverages and grids.
  4. Convert the projected grid and colormap back into an image using ArcInfo Workstation GRIDIMAGE command:
    Code:
    Arc: GRIDIMAGE mygrdprj colormap.clr newimage.tif TIFF

    Note:
    At ArcGIS 8.x there is a known problem with the ArcToolbox Grid to Image tool that does not allow it to use a colormap file for TIFFs.

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