How to Geo-reference Digital Images using ERDAS
1. Open ERDAS - Add raster layer (Image)
2. Raster - Multispectral - Control points
3. Select Polynomial
4. Select Image Layer
5. Then select reference image which you use to Geo-reference the image
6. Close the Window
7. Then select a place when you can find in both images, and add control Points (GCP)
8. Then add at-least add for GCP - Check the RMS error in the table, and make sure its under 1.
9. Select "Display Resample Image Dialog"
10. Save your out put and set the parameter as in the image
11. wait till you get 'Done' message
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