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Saturday, May 28, 2005

Earthquake Hazard Maps in Real-Time

The USGS Earthquake Hazards Program is publishing real time earthquake hazard maps. These maps show the probability of experiencing an earthquake of specific intensity within the next 24 hours. The probabilities are calculated every hour and the maps are refeshed on the USGS website.
See the latest Earthquake Hazard Map.

Tuesday, May 24, 2005

Landsat Satellite Image Tutorial

A beginner's guide to Landsat Images has been posted at This tutorial has sample images and interpretation for cities, lakes, swamps/marshes, forests, cropland, mountains, volcanoes, glaciers, clouds and more.
Read more at the Landsat Satellite Image Tutorial.

Thursday, May 19, 2005

Health Maps has published a nice collection of thematic maps that illustrate patterns of demographic and health data across the city of Toronto. Included are maps related to resident physical activity, body mass, smoking, alcohol use, fertility rate, teen births, low birthweight and infant mortality.
View the Health Maps Collection at

Sunday, May 15, 2005

Gavin Menzies: Zheng Discovered America in 1421

Gavin Menzies has published a book that promotes the theory that the Chinese discovered America decades before Columbus. In his book, "1421: the Year China Discovered America,", Menzies reports taht Admiral Zheng let a fleet of 300 ships to the American continent.
Read the book: 1421: The Year China Discovered America

Wednesday, May 11, 2005

Georeferenced Topographic Maps

National Geographic now has software that will allow you to export USGS topographic maps data for use in software such as AutoCAD, ArcGIS, ArcView, Microstation, and Integraph. You can export georeferenced maps in .geotiff .tiff and .jpg formats with world headers in either .tfw or .tab format. Raster maps are exported referenced to latitude/longitude in the NAD83/WGS84 map datum.
Learn more about Georeferenced Topo Maps at the National Geographic website.

Thursday, May 05, 2005

Satellite Image of Phytoplankton - Japan

More phytoplankton blooms shown on this Satellite Image of Japan. These blooms, in the ocean south of Honshu, Japan's primary island, are thought to be linked to a dust nutrient source.

Read more at about Satellite images of Phytoplankton at

Wednesday, May 04, 2005

Taxi Cab Theft and GPS

I always enjoy stories about how GPS foils criminals or captures them. Here's a story about how three men stole a cab and were caught because the cab was being tracked by a GPS system. ha ha
Read more about Taxi Cab Theft at the Herald Sun News.

Tuesday, May 03, 2005

Bay of Biscay Satellite Image - Phytoplankton

Phytoplankton blooms in the Bay of Biscay can be seen on this image obtained by NASA via the Aqua Satellite.

Visit Earth Observatory to read more about Phytoplankton - Bay of Biscay Satellite Image.

Monday, May 02, 2005

Auto Theft Map - Burglary Map

The City of Davis, California has created a public information website where visitors can prepare custom maps showing the locations of different types of crime in the city. Visitors can map arson, assault, auto theft, commercial burglary, DUI, drug busts, public intoxication, grand theft, hate crimes, petty theft, residential burglary, robbery vandalizm, vehicle burglary and weapons offenses for various time intervals in different parts of the city. Captured below is a screenshot showing reported auto theft mapped over a one year period.
Visit their site to see this Online Crime Mapping System

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