GIS Dictionary

The difference in elevation between adjacent contour lines.

[cartography] A line on a map that connects points of equal elevation based on a vertical datum, usually sea level.

[data capture] Assigning elevation values to contour lines.

[remote sensing] In remote sensing and photogrammetry, the ratio between the energy emitted or reflected by an object and that

[graphics computing] The ratio between the maximum and minimum brightness values in an image.

[graphics computing] Increasing the contrast in an image by expanding its grayscale range to the range of the display device.

[computing] A basic element of a software application’s GUI. Examples of controls include menus, buttons, tools, check boxes, slider bars,

1 [surveying] An accurately surveyed coordinate location for a physical feature that can be identified on the ground. Control points

[spatial statistics use for geostatistics] In statistical testing, a set of assumptions that will be accepted by test data if

[cartography] The angle between a vertical line (grid north) and true north on a map.

[data conversion] The process of changing input data from one representation or format to another, such as from raster to