ASTER User's Guide - NASA

ASTER Users Handbook• A Relative DEM. This does not require a requestor to provide GCPs. You only have tocopy and paste the L1A Granule ID in the appropriate place on the on-demand productorder page, and submit the order.You can order on-demand DEMs using the ASTER On-Demand Gateway. You will be ledthere through a link (Order custom DEM.) on the EDG’s Level-1A granules search page next tothe granule-listing column. Follow the instructions there to order a relative or absolute DEM.Archived Level-3 DEM ProductsYou can search for and order archived DEMs from the EOS Data Gateway by selecting theASTER Digital Elevation Model data set.10.0 Data Acquisition RequestsData Acquisition Requests (DARs) are user requests to have ASTER acquire new data over aparticular site at specified times. If the desired ASTER observations have not yet been acquiredor even requested, a requestor can become an authorized ASTER User, and can submit a dataacquisition request (DAR) via the DAR Tool. To register as an authorized ASTER User, use thelink below which will take you to the web site for registering, and explains the procedure:http://asterweb.jpl.nasa.gov/gettingdata/authorization/default.htmOnce you are registered, you can go to the on-line ASTER DAR Tool web site to enter yourrequest:http://e0ins02u.ecs.nasa.gov:10400/Be sure to read the “Getting Started” information for help on using the tool, and getting anyplug-ins if necessary.11.0 ASTER Applications11.1 Cuprite, NevadaThe Cuprite Mining District is located in west-central Nevada, and is one of a number ofalteration centers explored for precious metals. Cambrian sedimentary rocks and Cenozoicvolcanic rocks were hydrothermally altered by acid-sulfate solutions at shallow depth in theMiocene, forming three mappable alteration assemblages: 1) silicified rocks containing quartzand minor alunite and kaolinite; 2) opalized rocks containing opal, alunite and kaolinite; 3)argillized rocks containing kaolinite and hematite. A general picture of the alteration is shown inFigure 17, combining bands 4,6 and 8 in RGB and processed to increase the color saturation.41