Listing of Glossary
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a unit of an integrated survey where common processes (involving soils, vegetation and other factors) have created a combination of features that will support a particular group of uses.
a collection of related geographic data. Depending on context, a layer may have some specific relationship to other layers. For raster imagery, a layer can represent one sensor in a multispectral array. In some cases, a layer may contain a coverage, hence provide an attribute value at all locations. In some cases, a layer simply collects all features with a common graphic symbolism.
|Level of measurement||
a grouping of measurement scales based on the invariance of certain properties. Measurement scales at a common level of measurement can be transformed into another scale at the same level without reducing the information content.
Angular distance, expressed in degrees and minutes, along a meridian north or south of the equator.
The part of the drawn map explaining the meaning of the symbols used to code the depicted geographical elements.
The angular distance east or west from a standard meridian to another meridian on the earth's surface; expressed in degrees and minutes.
One of the basic geographical elements, defined by at least two pairs of XY coordinates.
An array of data values that can be quickly accessed by a computer program to convert data from one form to another, e.g. from attribute values to colours.
|Land Information System (LIS)||
A special type of GIS that manages and analyzes data related to land ownership (e.g., tax parcels, urban infrastructure, property assessment). A GIS used for municipal or county level applications is typically structured as an LIS.