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In ArcMap, when exporting a contour feature class containing elevation values to CAD format using the Export To CAD tool, the output CAD file does not preserve the elevation values of the contour lines; the contour lines in the CAD file displays incorrect elevation values.
When exporting a contour feature class to CAD format, the Export To CAD tool searches for a field with the name Elevation or Contour containing the elevation values . When the tool fails to find the specific field, the output CAD file does not preserve the elevation values of the contour lines. The image below is an example of the attribute table of a contour feature class containing elevation values recorded in a field named other than Elevation or Contour.
Use one of the following options to resolve the issue:Create a copy of the feature class to rename the field containing the elevation value
This option creates a copy of the contour lines feature class and renames the field containing the elevation values to Elevation or Contour in the copied feature class attribute table. This method preserves the name of the original feature class attribute table. Any changes made to the field name are only reflected in the copied feature class.
To export the contour lines to CAD, use the newly created feature class as the input for the Export To CAD tool. The exported CAD file shows the correct elevation values in the Elevation field of the Polyline attribute table.
Another alternative is to create a new field in the contour feature class containing the correct elevation values, and name the new field as Elevation or Contour. Use the Field Calculator tool to populate the new field with the elevation values. The following technical article provides a step-by-step workflow of this method, How To: Retain elevation values when converting from a shapefile to CAD.