(Data West Research Agency definition: see GIS glossary.) Map graphic features or elements can be classified as points, lines, areas, or "raster." In GIS, these features are grouped together to ...

Voluminous clouds of cosmic dust permeate our galaxy, but only recently has software allowed detailed observations of the ...

The map shows the location of the 307 rural areas analysed in the study. The reported populations in the graphic were found to be underestimated by between 53 and 84 percent.