My only thought is that you must have specified one or more parameters incorrectly, or maybe it's not valid to resample your imagery to Landsat bands. I don't know anything about archer images, so I'm not sure what might have gone wrong. If you can provide more details about what your input imagery is like (especially how many bands and what wavelengths they correspond to), and the resampling parameters you chose in ENVI, I may be able to come up with some more specific ideas for you. - Peg Exelis VIS Technical Support

Peg, ARCHER is a hyperspectral system operated by the Civil Air Patrol. It has 52 bands with a spectral resolution of 11.4 nm. It senses from 505 nm to 1100 nm. Each image file is one minute of flight and to create a scene image, extensive mosaicking must be done. Space Computer Corp. is the manufacturer. ARCHER does real time georegistration and real time cueing of targets via anomaly detection, signature match and can do change detect. It can also create signatures on the fly for inclusion as a exact match chip. The native ARCHER format must be converted to an ENVI *.igm file and can also be converted into geoTIFFs. . I have tried to resample from the *.igm and the PCI pix format without success. I'm not sure where to go from here Mark

The only *.igm file that ENVI creates is a geometry file that you would use for a certain type of georeferencing. I don't think this is what you probably have. Maybe you meant *.img? That could be an ENVI format file, which can have any filename extension, or it could be an ERDAS Imagine format file, which always has a *.img extension (I believe). At any rate, after you open the image in ENVI, can you see all of the bands, and the wavelengths associated with them? If you create a spectral profile, do the pixel spectra look reasonable? Can you display the image properly? When you try the resampling how do you set all of the parameters? We would probably be able to track this down faster if you could submit this problem directly to Exelis VIS Technical Support (303) 413-3290 or support@exelisvis.com (or your local distributor). Someone may need to play around with your dataset to figure out what is triggering the problem. This forum is intended mainly for ENVI customers to provide suggestions to each other, although we try to keep an eye on it as well. - Peg Exelis VIS Tech Support

Peg, The resampling parameters I used were 1. Predefined filter function: Landsat 5 2. Set bad values to 0.00 3. Output data type: Floating point 4. Output to file I might add ARCHER was designed as a tool to augment several missions of Civil Air Patrol and not for serious research work, so there is a degree of "close enough for govt. work" built into the system. Originbally it was envisioned as a search and rescue tool and during the Steve Fosset search it found several aircraft wrecks that were previously unkown so in that sense it worked as intended. I personally flew a mission to determine the extent of contamination from an oil spill after a refinery was flooded and again, after processing and classification, we showed it worked well, although this was outside the initial concept for the system. The utility comes from the HSI spatial and spectral resolution of 1m and 11.4 nm respectively plus the rapid response time to an incident. That and the low operational cost

So, when you open the image file in ENVI, are all of the bands there, and showing wavelengths? Do the spectra look correct? I am thinking that perhaps ENVI is not able to figure out which Archer bands go into which Landsat bands, if it isn't reading the wavelength information from the input file. Or maybe the wavelength units aren't set properly? Or something along those lines. - Peg