ABSTRACT
Geographical Information Systems (GIS) are utilized extensively in assessing water occurrence on and in the Earth. This technology allows users to make spatial assessments of data. It has the capability to bring multiple types of data into the same analysis scenario. Data for a GIS can come from multiple sources. One primary source of spatial information for field water science is the Global Positioning System (GPS). This is a system that uses multiple navigational satellites to allow a user to precisely locate a point on the Earth. Satellite data are another type of data frequently used by water scientists. Satellite data are remotely sensed data types that focus on spatially and temporally variable features such as land cover types.
