This site alos includes a description of how so il and yield data is collected and analyzed along with samples of resulting map s . It further explains how the analyzed data is used to control the application of chemic als on crops. Funde d by NASA, the purpose of the program is to encourage schools, business, and ci t izens to access and use the databases and subsequently develop new applications for earth and science remote sensing data. Participation in the program is open to all foreig n and domestic organizations and citizens. The server further provides informat ion on RSD projects available to the public and how various target audiences mig ht use particular remote sensing data.
Some projects require a subscription fee .
The server site outlines the standards set by USGS for digital and graphic produ cts. The graphic products listed are topographic maps, thematic m aps, and photoimage maps. Information regarding specifications, such as defini t ions, format, collection, processing, etc., is shown for each product along with the procedure s and criteria used for acuracy verification. The server site is ESRI's description of Spatial Database Engine software. SDE includes a set of software services th at perform fast, efficient spatial management and operation of large shared data bases.