Folks, Does anyone have any tricks or procedures for georeferencing the multiple resolutions of Landsat 7 ETM+ data? I would like to georeference both the panchromatic and multispectral data (thermal band excluded) without having to re-define the same GCP's from one band to the next. I've given some thought to a possible method but wanted to see if anyone else has a better way of doing it: 1. Import the multispectral GeoTIFF's into a single file. 2. Import the pan GeoTIFF into a separate file. 3. Collect GCP's using the higher-resolution pan data. 4. Export the GCP's, and then DIVIDE the CELL coordinates by two, leaving the MAP coordinates unchanged. 5. Import the GCP's into the multispectral file. 6. Safety check! Reassess the GCP's on the multispectral data. I'm assuming here that the pan data and multispectral data are exactly co-registered, and that the cell dimension of the pan data is exactly half that of the multispectral data. I figure that if both images have the same top-left cell coordinate of (0,0) then a GCP at cell (20,20) in the pan band should be the same as one at (10,10) in the multispectral bands. Any thoughts? Regards, ------------------------------------- Frank Bilki GIS and Training Consultant Micromine Pty Ltd 174 Hampden Road, Nedlands, Western Australia Ph: +61 8 9389 8722 Fax: +61 8 9386 7462 Email: <mailto:[EMAIL PROTECTED]> Web: <http://www.micromine.com.au> ------------------------------------- ----------------------------------------------------------- To make changes to your subscription, please visit our website, http://www.ermapper.com/technicl/ermapperl/index.htm
