Thursday, June 26, 2008

KML File - Week 7 assignment

http://coastal.er.usgs.gov/remote-sensing/advancedmethods/DRTO/drto_bathy_index.kmz
This KLM file on Google Earth is of the Dry Tortugas National Park (DRTO) in the Florida Keys. When you run the file you will see that this place is anything but dry. There are approximately 79 interactive location pins in this file. The pins represent submerged Topography data with a DEM image. The data pins are organized to make up a grid of 2 km x 2 km tiles. There is also an elevation color bar at each location which demonstrates both surface topography, and submerged topography.
http://coastal.er.usgs.gov/remote-sensing/advancedmethods/googleearth.html

Sunday, June 15, 2008

Proportional Circle Map

http://www.cscs.umich.edu/~crshalizi/slothblog/2006/
Above is an extreme example of a proportional circle map; this is also an example of a cartogram. This map is demonstrating the Red-Blue political divide in the US. It is broken down county by county and it is area proportional. The color demonstrates how the counties voted for either party (red/Republican, blue/Democrat) during the 2000 Presidential election. The intensity of the color signifies the degree to which the counties voted Democrat or Republican.

Thursday, May 22, 2008

Dot Distribution Map

http://www.ncaction.org.uk/search/entry.htm?id=1447

Dot distribution maps are a type of thematic map. The theme of this GIS dot map is the population in Brazil. For this map each dot represents 100,000 people. This type of map is an efficient way to demonstrate the location of population concentrations.

Propaganda map

http://www.libertythink.com/2005/08/globalization-uber-alles-ftaa-decline.html

A propaganda map contains Information that is spread for the purpose of promoting some cause. The map above was constructed to demonstrate the reason for the “decline of America;” the FTAA is the Free Trade Area of the Americas.

Tuesday, May 20, 2008

Hypsometric map

http://iodeweb5.vliz.be/oceanteacher/resources/other/GISModules/Module_h/module_h2.html

Hypsometric maps are a form of topographic map. Similar to topographic maps, hypsometric maps show changes in elevation; however, the difference being that hypsometric uses color to denote changes, whereas, topographic maps use lines.

Topographic Map

http://www.geo.mtu.edu/volcanoes/fuego/topoair2.html
Above is a topographic map of twin volcanoes named Fuego and Acatenango; which are located in Guatemala. On this map, each contour line represents a change in elevation of 200 feet. Contour lines that are close together denote sharp changes in elevation; conversely, the greater the distance between topographic lines, the more gradual is the slope.

Monday, May 19, 2008

PLSS MAP

http://nationalatlas.gov/mld/plss00p.html

PLSS refers to the Public land Survey System. This is a grid-like system used in most of the United States to survey and record land ownership. The PLSS usually contains or is formatted from Township, Range & Section Boundaries. Above is a sample map from the US Geological Survey (USGS) demonstrating a PLSS map.