Apply a Warp to a Grid

Use this warping method if your grid is a data source, for example an ER Mapper file, where the pixel numbers have meaning (e.g. reflectance values). Note that the method is very memory intensive and can be time-consuming for large or high resolution scanned images. Adding more RAM to your computer may decrease your processing time.

1. Select the Coordinates > Georeferencing > Warp a Grid menu option. The system displays the Warp a Grid dialog box.

2. Use the Browse button next to the Input grid box to select the grid you want to apply the warp to.

3. Use the Browse button next to the Warp definition file box to select the warp file (*.wrp) you want to use (you must have already defined this file).

4. In the Output warped grid field, specify the name of the new warped grid file.

5. The New cell size is an optional parameter. If left blank, a default cell size is calculated to give approximately the same number of grid cells in the new grid as they are in the old grid file. By clicking the Default button, this value may be determined, and if desired, altered.

6. Click Next. The system displays the cell size and grid dimensions for the new grid.

7. Click Finish. The system displays the warped grid or image on a new map using the projection defined in the warp file.