The Geological Earth Mapping Experiment (GEMx) is a joint campaign between NASA and the U.S. Geological Survey (USGS) to map portions of the western United States for critical minerals using advanced airborne imaging. GEMx is a five-year research project designed to collect measurements over arid and semi-arid regions in the United States including parts of California, Nevada, Arizona, and New Mexico. GEMx uses the Airborne Visible/Infrared Imaging Spectrometers (AVIRIS-C, AVIRIS-3, and AVIRIS-5) and MODIS/ASTER Airborne Simulator (MASTER) instruments aboard the ER-2 aircraft.
A majority of the Delta-X data are archived at https://