Tuesday, March 31, 2009

Black and white aerial photo


This black and white satellite image shows Alaska's Mount Redoubt volcano as it emits a steady ash plume. The volcano 100 miles southwest of Anchorage has erupted 18 times since March 22, 2009 sending ash in various directions.

http://www.examiner.com/x-219-Denver-Weather-Examiner~y2009m4d4-Mount-Redoubt-erupts-again-sending-ash-and-smoke-50000-feet-into-the-air?cid=exrss-Denver-Weather-Examiner

Friday, March 27, 2009

Nominal area choropleth map


Also known as a descriptive map this nominal area choropleth map provides geographical information about Canada's vegetation. The variation in color is associated with qualitative differences.

http://atlas.nrcan.gc.ca/site/english/learningresources/carto_corner/veget.jpg

Wednesday, March 25, 2009

Histogram


A histogram is a graphical display of tabulated frequencies, shown as bars. The histogram shown here includes the standard deviation and mean.

http://yrs.sonikson.net/terms/histogram.php

Box plot


A box plot is a convenient way of graphically depicting groups of numerical data through their five-number summaries (the smallest observation, lower quartile, median, upper quartile, and largest observation).

www.epa.gov/volunteer/stream/vms62.html

Saturday, March 21, 2009

Stem-and-Leaf Plot


A stem-and-leaf plot is a display that organizes data to show its shape and distribution. This picture would be a good example, except the new housing starts in the USA could be described as skewed to the right because the higher values are more spread out than the lower values.

http://www.uow.edu.au/student/attributes/statlit/modules/module2/shapedist.html

Wednesday, March 18, 2009

Correlation matrix


A correlation matrix shows the strength and direction of a linear relationship between two random variables. This matrix is a calculated protein correlation matrix for phage T7. Correlated behavior ranges from high(red) to low(blue), and the triangular block of red reflects proteins involved in phage assembly, a highly coordinated process.

http://yin.che.wisc.edu/images/ProteinMatrix.jpg

Tuesday, March 17, 2009

Star Plot


A star plot is a graphical data analysis method used for examining the relative behavior of all variables in a multivariate data set. This is an example of a star plot from NASA, with in the center the some most desirable design results represented.

http://upload.wikimedia.org/wikipedia/commons/0/09/MER_Star_Plot.gif

Monday, March 16, 2009

Similarity matrix


A similarity matrix is a matrix of scores which express the similarity between two data points. They are generally used in sequence alignment. The higher the score the more similar charachters it receives.

http://tomcat.esat.kuleuven.be/txtgate/images/distmat.png

DRG


Digital Raster Graphics (DRGs) are scanned images of U.S. Geological Survey (USGS) topographic maps. The scanned image includes all standard map collar information.
When the DRG is combined with other digital products, such as digital orthophoto quarter quadrangles (DOQQs), or digital elevation models (DEMs), the resulting image provides additional visual information for the extraction and revision of base cartographic information.

http://www.tceq.state.tx.us/gis/drg.html

Sunday, March 15, 2009

Isopach


An isopach is a contour that connects points of equal thickness. The rainbow contours correspond to thickness of sediment on the ocean floor and the increasingly pink colors represent greater sediment thickness. The brown to red seep gas plume contours were generated from the August, 1996 sonar survey.

http://seeps.geol.ucsb.edu/pages/isopach.html

Saturday, March 14, 2009

Isotach


Isotachs are lines of equal wind speed. They are most often contoured in the upper levels of the atmosphere, especially at the jet stream level. They are important for locating the jet stream and jet streaks within a jet stream. The green lines in the photo are the isotach lines, showing the different wind speeds along the latitudes of the US.

http://www.comet.ucar.edu/resources/cases/c2_06dec95/gif/250ht_isotach.gif

Thursday, March 12, 2009

Doppler radar


A doppler radar is a radar using the doppler effect of the returned echoes from targets to measure their radial velocity. In this map, the doppler radar shows where there will be rain in the area. The bits of yellow are much heavier rain.

http://www.bom.gov.au/weather/radar/about/new_radar_services.shtml

Tuesday, March 10, 2009

Infrared aerial photo


An infrared photo can be used to document and monitor such items as damage to roofs, the tracking of dairy farm out flows, pinpointing the source of, and monitoring, insect or disease infested vineyards, or sites contaminated by toxic chemicals, and many more applications. In this photo, the red and yellow show Hurricane Andrew as it hit Miami. The yellow bands around the hurricane are wind and rain bands.

http://www.srh.noaa.gov/mfl/events/?id=andrew