GMAP Procedure

About Map Data Sets

Map Data Set
A map data set is a data set supplied by SAS that contains variables whose values are coordinates. These coordinates define the boundaries of map areas, such as a state or country.
Map data sets are used in the GMAP procedure. Map data sets store spatial information across multiple observations. Each observation contains multiple variables with their specific data values. Map data sets supplied by SAS contain all the variables expected by the GMAP procedure. Map data sets that are not provided by SAS must contain X and Y boundary point coordinate variables as well as one or more map area identification variables. If these variables are missing the procedure stops and outputs an error message to the SAS log. The GMAP procedure can take as input a map data set and a response data set, provided that both data sets contain the same id-variable. Alternatively, you can use a single data set as input if it contains either the map data or a variable that references a map data set.
There are two types of data sets that are provided with SAS/GRAPH for mapping. Starting with the second maintenance release of SAS 9.3, GfK GeoMarketing digital, vector-based map data sets are available for use. These are in addition to the traditional map data sets that have been available with SAS 9.3 and earlier releases. All of the content in the traditional map data sets are represented in the GfK map data, and GfK also provides additional data. SAS licensed the map data from GfK GeoMarketing GmbH, and then converted the data into a SAS map data set format. The GfK map data sets are uniform and accurate for the whole world, and are intended to eventually replace the traditional map data sets.
SAS/GRAPH software includes a number of predefined map data sets.The traditional data sets are described in The METAMAPS Data Set.