thematic map


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thematic map

(Data West Research Agency definition: see GIS glossary.) A map that displays the spatial distribution of an attribute that relates to a single topic, theme, or subject of discourse. Usually, a thematic map displays a single attribute (a "univariate map") such as soil type, vegetation, geology, land use, or landownership. For attributes such as soil type or land use ("nominal" variables), shaded maps that highlight regions ("polygons") by employing different colors or patterns is generally wanted. For other attributes (like population density - a "metric" variable), a shaded map in which each shade corresponds to a range of population densities is generally wanted.

Thematic maps are used to display geographical concepts such as density, distribution, relative magnitudes, gradients, spatial relationships and movements. Also called geographic, special purpose, distribution, parametric, or planimetric maps.
References in periodicals archive ?
Figure 1 shows the thematic map of spatial distribution of horseweed plants (Figure 1A) and the polygon representing its occupation area (Figure 1B).
By overlapping the information from all the thematic map final scores are allocated, as shown in Figure lb.
By multiplying the RUSLE factors calculated earlier (C * R * P * LS) with the k-layers (thematic map), soil erosion risk thematic map was created.
2]-N/l Phosphate total phosphate mg P/l Villages thematic map m thematic map m Towns thematic map m Cities thematic map m Harbours thematic map m Industry thematic map m ICZM Tourism thematic map m Streams thematic map m Rivers thematic map m Erosive shoreline thematic map m Semi intensive hatcheries thematic map m Intensive hatcheries thematic map m Ponds thematic map m Sewage discharges thematic map m Traffic lanes thematic map m Coastal usage thematic map m Environmentally protected area Description Parameters Unsuitable Allowable Physical Min.
Then classification of these values is carried out in to two classes and thematic map is generated.
With these studies in mind, a clear gap exists in the literature concerning the interpretation and testing of thematic map symbols in a whole-map context, particularly with regard to the recognition of spatial patterns.
The benefit of thematic map creation is the automatic map element construction in GIS.
The visualization can be either a thematic map of the network, for clear graphical interpretation, or a detailed tabular report conveniently provided directly in the Pipe Renewal Planner dialog.
For example, a Texas state road map would be an example of a reference map, but a map showing each county of Texas with color representing its population would be an example of a thematic map.
Determine whether there is congruency between the actual and predicted illness rates for countries near and distant from the equator, and discuss how a thematic map aids analysis.