Hypsography Hypsography is the scientific study of the Earth's topologic configuration above sea level, especially the measurement and mapping of land elevation. This refers to elevation contours and supplementary spot elevations. An interactive map allows you to actively participate in the mapping process by choosing which information you want to appear on a map, analyze the data, or add your own. Latitude is angular measurement north and south from the equator, longitude is angular measurement east and west of the prime meridian. Layer - A term used describe one set of thematic data in a map library.
Layers represent such themes as soils, roads, or drinking water wells.
Metadata - Data about data. An overall description of the contents of a database. Pan - To move a viewing window to the left, right, up or down to display areas that currently lie outside the viewer. Polygon - A multisided figure that represents an area on a map. PostScript A PostScript is a page description language.