Technical Abstract: Excellent ASTER scenes over our New Mexico Jornada test site were acquired on May 9, 2000, February 12, May 12, July 22, September 17, October 19 and November 11, 2001. There were simultaneous field campaigns for the May 9, May 12 and September 17 scenes. Also, MASTER coverage was obtained for the May 12 scene. The White Sands National Monument was also within several of fthe scenes. Emissivity values from the ASTER data from the May 9 and May 12 scenes for the gypsum sand at White Sands were in good agreement with values calculated from the lab spectra for gypsum and with each other except for band 10. At the Jornada grass site, the agreement between the ASTER results and those calculated from the lab spectra was very good. This is a little surprising because there is generally a mix of bare soil and sensecent vegetation at this site, so we would have expected to see a flatter spectral response due to the vegetation. The results for the Jornada mesquite site show a larger difference between the lab results and the ASTER results; e.g., 0.05 for the 8.29 micron channel. These results indicate ASTER and TES are working very well. The surface brightness temperatures from ASTER were in reasonable agreement with measurements made on the ground during the field campaigns mentioned above.