GIS A geographic information system

A GIS is most often associated with a map. A GIS is most often associated with a map. The map is a display of a data base in map form The map is a display of a data base in map form The data base is A relational database that groups data using common attributes found in the data set The data base is A relational database that groups data using common attributes found in the data set

Example presented the data to the user as relations ( a collection of tables with each table consisting of a set of rows and columns, with each flat table have a common row.) presented the data to the user as relations ( a collection of tables with each table consisting of a set of rows and columns, with each flat table have a common row.) provided relational operators to manipulate the data in tabular form provided relational operators to manipulate the data in tabular form

relational database have a location or area associated with the value. relational database have a location or area associated with the value. The area can be raster position which is a square or a given area on a map The area can be raster position which is a square or a given area on a map The area can be a shape area defined by a polygon. The area can be a shape area defined by a polygon.

Grass a raster data base (free) Grass a raster data base (free)

Raster

ARC View (polygon)

Awhere is a limited version of GIS learning curve only 4 hr. Awhere is a limited version of GIS learning curve only 4 hr. Associated with each data base file is a shape file that contains the shape of the polygon for each element in the data base.

Shape files and attribute files for new mexico are available at Shape files and attribute files for new mexico are available at