Digital Raster Graphics

www.lmic.state.mn.us/bmap90/drg/drg.htm

A digital raster graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) standard series topographic map as a backdrop data layer. The raster image usually includes the original border information, referred to as the "map collar". The image above shows the state capital downtown mall area of St. Paul, Minnesota.

Lorenz Curve (Accumulative Line Graph)

www.answers.com/topic/lorenz-curve

A graph for showing the concentration of ownership of economic quantities such as wealth and income; it is formed by plotting the cumulative distribution of the amount of the variable concerned against the cumulative frequency distribution of the individuals possessing the amount. The Lorenz Curve above discusses the disparity in percentage of income to the percentage of housholds. The curve shows the level of inequality in the two variables.

DEM (Digitial Elevation Model)

www.dpi.vic.gov.au/.../digital_elevation_models

Digital Elevation Models provide a snapshot of the land. A Digital Elevation Model (DEM) is best described as a spatially geo-referenced data set that is a popular way of encoding the topography for environmental modelling purposes. Different models can be used to plot roads, railroads, buildings and communities. DEM's are built using remote sensing techniques. The above model shows slope, elevation and aspect of the land being studied.

Parallel Coordinate Graph

bdtnp.lbl.gov/.../ParallelCoordinate_MainGUI.png

Parallel coordinates are a common information visualization technique for high-dimensional data sets. In a parallel coordinate view, a data set consists of a set of samples. Each variable in the data plot is represented as its own Y Axis on the graph. A maximum point for each Y axis is selected, and they are scaled relatively to each other so that each variable takes up the same area in the graph space.

Dopplar Radar

www.noaanews.noaa.gov/stories/images/

A Doppler Radar uses the Doppler effect of returned echoes from certain objects to measure their radial velocity. They are used for various things including air traffic control, police speed guns, and air defense. Here is a photograph from a Doppler Radar of a Hurricane slamming into the coastline of Texas. Doppler Radar can be used by meteorlogists to determine weather patterns and forcastes.

LIDAR

http://imaging.geocomm.com/gallery

LIDAR (Light Detection and Ranging) is an optical remote sensing technologay that measures different properties of dispersed light to find range or other information of a distant target. The difference between lidar and radar is that lidar uses shorter wavelenths of the electromagnetic spectrum, generally close to infrared.
Here is a LIDAR image of ground zero after the Sept. 11 attacks.

Bivariate Choropleth Map

gis.esri.com/.../proceed/papers/pap171/p1712.jpg

Bivariate mapping is an important mapping technique in cartography. Given a set of geographic features, it maps two variables on a single map by combining two different sets of graphic symbols. Bivariate maps may consist of point features, line features or polygon features. The above bivariate map shows the median house value for different counties in Ohio.