Warp a Raster Surface

To transform a raster surface using the Warp Surface tool:

1. Open the surface you want to adjust.

2. Select the surface in the Layers window.

3. Select the Warp command.

In the Attributes fields:

4. Select the Interpolation and/or Bias settings to apply to the primary elevation attribute (for more information, see Interpolation).

5. [Optional] Set an alternative attribute as the primary elevation attribute.

6. Set the interpolation method for the remaining numeric attributes.

7. If a bias has been set for the primary elevation, other attributes can be set to “Follow primary” or “None”. If set to “Follow primary”, then the values of the attributes associated with the node mapped on the primary elevation band will be copied directly to the output grid (for more information, see Bias).

To select a different horizontal coordinate system:

8. Click Browse (...) for the Horizontal field, and select a new coordinate system from the Output Coordinate System dialog box. See Output coordinate system for more information.

If you do not want to change to a new coordinate system:

9. Click Browse (...) and select the same coordinate system as listed in the Current coordinate system field at the top of the Warp Surface dialog box.

10. . [Optional] Select a vertical coordinate system from the list, to designate it for the CSAR metadata.

11. To resample the surface, enter a resolution value in the Output resolution field. See Output resolution for more information.

12. Select a Reprojection method from the list. The default will be Fast reprojection. See Reprojection method for more information.

13. [Optional] Select the Recompute statistical layers check box to have the statistical layers recalculated during warp.

14. Click Browse (...) for the Output surface field to define the name and location for the transformed surface.

15. Click OK.

A new surface is created from the existing data, using the selected coordinate system and algorithms and is listed in the Layers window.