Merge rasters using Spatial Analyst, in ArcGIS 9.3

Discussion created by annaglenn on May 19, 2014
Latest reply on May 22, 2014 by curtvprice
I am getting error messages when trying to merge three orthophotos using Spatial Analyst.

I have been following the recommendations in Forum threads, and I followed the directions in the ESRI support document 20988 "Merge rasters using ArcGIS Spatial Analyst", and I followed the directions in ArcGIS Desktop Help 9.3.

I was careful to make sure each orthophoto has a different name. Also, each ortho is made of four files, and those were the same for each ortho: band_1, band_2, band_3, and band_4. I changed the names so that all 12 parts had different names. (12 comes from this equation: 3 orthos x 4 "band" files = 12)

This is the first error message I got:
ERROR 010316: Unable to open the input grid: C:\USERS\ANNAGL~1\APPDATA\LOCAL\TEMP\Z_Z_Z2 ERROR 010067: Error in executing grid expression.

When I go to the folder to see if there are files in there, I found files named "z_z_z2", "z_z_z3", and "z_z_z4", and each of these looks like a darker version of one of my original three orthophotos.

I'm not sure what I'm doing wrong, or simply what to do next.
Please help if you can -