Have you used Calibration in ERDAS IMAGINE?
Let’s say you have a 2GB 20:1 MrSID compressed color infrared (CIR) image you need to deliver to an ArcGIS user in your organization. The last thing you want to do is resample and re-compress, right? That takes too much disk space and time.
Display the image in the Viewer, select Raster > Geometric Correct > Reprojection. On the dialog that appears, select the new projection and then select the ‘ruler’ on the Geo Correction Tools dialog to calibrate the image.
This process will create a .aux for you MrSID file storing the mathematical model to reproject the image on-the-fly.
Deliver both the MrSID image and the .aux file to your ArcGIS friend. That as fast and simple.
- Starting ERDAS IMAGINE 9.2+, the IMAGINE MrSID encoders write full projection information to the MrSID header. WKT strings are written to MG2, and WKT strings and GeoTIFF tags to MG3 data.
- With this change, the need for .sdw files and .aux files for map and projection data are no longer needed, but are available.