GIS Dictionary

[Internet] The unique name of a computer system on the Internet, such as “esri.com.”

[spatial analysis] A method of defining the rings in an analysis so that the values inside the rings are exclusive.

[GPS] Acronym for dilution of precision. An indicator of satellite geometry for a constellation of satellites used to determine a

[physics] The apparent change in frequency of sound or light waves caused by the relative motion between a source and

[GPS] Signal processing that uses a measured Doppler shift to help the receiver track the GPS signal.

[aerial photography] Acronym for digital orthophoto quadrangle. A computer-generated, uniform-scale image created from an aerial photograph. Digital orthophoto quadrangles are

[navigation] Acronym for digital orthophoto quarter quadrangle. A digital orthophoto quadrangle (DOQ) divided into four quadrants.

[cartography] A quantitative, thematic map on which dots of the same size are randomly placed in proportion to a numeric

[cartography] A map that uses dots or other symbols to represent the presence, quantity, or value of a phenomenon or

[printing] A photographic film covered with uniformly sized, evenly spaced dots used to break up a solid color, producing an

[computing] The level of coordinate exactness based on the possible number of significant digits that can be stored for each