Synopsis
GISGlobal_Demo is a demonstration that generates a map transformation consisting of US Census Data, SeaSat temperature data for September 17, 1995, and the CIA World Databank II.
The demonstration uses the CIAWorldDataBank and the GISMapTransform modules to provide a framework for displaying United States census data and SeaSat temperature data of the Pacific and Atlantic Ocean. In addition, the inverse projection modules are used to pick specific census points to retrieve the population information for the location in question.
After instancing GISGlobal_Demo, select a census singleton point from the first slider. Blue location markers are projected onto a spherical surface. (The intensity of blue changes with respect to the population density.) By manipulating other widgets, you can change the projection, display the CIA World Databank II coastal map, turn on the temperature data for the Pacific and Atlantic Oceans, and render the surface of the North American continent.
To retrieve information from a specific census data location, position the mouse cursor over a location and press Control-MB1 . A dialog box is displayed and it contains information about town and its population. Click OK on the dialog box to continue with the demonstration.
Interesting items to note about the data sets:
Population density increases near shorelines
Rural road systems are revealed by smaller population centers, as communities tend to cluster around transit systems.
The US Census Data was off a full 5 degrees of longitude for the Puerto Rican census, placing the population of the island in the Atlantic Ocean.
Sea surface temperature extremes not only vary with latitude, but with longitude: warmer sea surface temperatures are apparent off the eastern seaboard of the US in comparison with temperatures of similar latitude on the western seaboard.
Note: The GISGlobal_Demo demonstration loads large quantities of information (several megabytes) into system memory. Slower machines may have trouble manipulating this information.
Example
Examples.Visualization.GISMapDisplay
File
v/gis2.v