GIS DEFINITIONS

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Author:
TipTheScales
ID:
181295
Filename:
GIS DEFINITIONS
Updated:
2012-11-02 04:32:42
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GIS DEFINITIONS
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GIS DEFINITIONS
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  1. GIS
    a systemic compilation of geographically referenced information, For the purposes of storage manipulation analysis and Presentation.
  2. Attribute table
    a table that is attached to an data layer displaying Specific characteristics For the map features
  3. Topology
    a set of physical interconnections between elements which remain unchanged under certain transformations.
  4. Projection
    the pictorial representation or method of representation of a curved surface onto a flat surface
  5. Datum
    a point of reference on the surface of the earth Corresponding to the size and shape of the ellipsoid approximation of the earth ( sharing the same center as the actual) upon which a particular coordinate system is based
  6. Feature
    a geographical component associated with a particular location, which can take the form of either points, lines, or polygons
  7. Nad 27
    one of the first datums, now outdated.
  8. NAD 83
    Like WGS 84, this is a good data associated with the ellipsoid of the earth called GRS80
  9. State plane
    a coordinate system set up for use in the United States, using feet as a unit of measurement helping for high accuracy with within a state, Giving each state its own point of origin
  10. UTM
    Universal transverse mercator, a world wide geographic Coordinate system using meters
  11. Raster data model
    an array of the equal size cells, or pixels, each having one value to represent a particular theme. Multiple layering is conducive to finding relationships between themes

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