Subject: ‘USGS’
March 22, 2012 Mapping Access to Safe WaterData, MapsWorld Water Day is held on March 22 each year as a way to bring global attention to the world’s freshwater resources. Started by the United Nations, the theme for this year’s World Water Day is Water and Food Security. Access to clean water is not just necessary for hydration, but is needed to produce ... read more January 28, 2012 Where to Look for Historical MapsMapsThe use of extracting data from old paper maps is growing in popularity as a method to understanding historical geography. David Ramsey popularized the method of georectifying historical maps and draping those maps over a DEM to create a 3D view. Pastmapper is a project that digitizes historical maps in order to recreate the state ... read more January 16, 2012 National Forest Map and GIS DataDataWhat areas of the United States contain the densest amount of woody biomass? Showing the conterminous United States, the intensity of biomass (a measure of the amount of organic carbon—stored in the trunks, limbs, and leaves of trees) has been mapped out with a baseline year of 2000. The darkest green areas are the locations with ... read more December 3, 2011Map Projections and Coordinate SystemsProjection and Coordinate SystemsTutorials to help you understand the various projection and coordinate systems. Also find conversion tools to convert datasets from one system to another. Introduction to Map Projections What is a Map Projection? How is the 3D surface of the earth modeled onto a 2D surface? The basic concepts behind map projections explained. Common Map Projections ... read more November 30, 2011 New Global Elevation Data Available to Download: Global Multi-resolution Terrain Elevation Data 2010DataThe U.S. Geological Survey (USGS) and the National Geospatial-Intelligence Agency (NGA) have released an updated and more accurate global elevation model that pulls data from Digital Terrain Elevation Data (DTED®) from the Shuttle Radar Topography Mission (SRTM); Canadian elevation data; SPOT 5 Reference 3D data; data from NASA’s Ice, Cloud, and land Elevation Satellite (ICESat); and ... read more November 23, 2011 Landsat Satellite ImageryGIS News450 terrabytes of Landsat imagery from the European Space Agency’s archives has been opened up to the public for free. The agency’s archives covers 30 years of Landsat data. Data that can be requested for free from ESA’s archives includes: Archived Landsat-4 Thematic Mapper (TM) data in December 1982 Archived Landsat-5 TM data from April ... read more September 12, 2011 Over 120 Years of Mapping History OnlineGIS News, MapsThe USGS has been busy scanning and georeferencing its historical maps as part of the USGS National Geospatial Program (NGP). The USGS Historical Topographic Map Collection currently makes over 98,000 maps dating as far back as 1884 available to the public. The maps are available in GeoPDF format and can be downloaded for free from the USGS store. There ... read more September 8, 2011 Free GIS BooksFree GIS, PublicationsBuilding a collection of reference and academic texts on GIS can be costly. There are some free online source materials that can be a valuable contribution, especially if your book budget is nonexistent. Most of these free GIS books are available in downloadable PDF format and can be read from a computer or on an ... read more September 6, 2011 U.S. Wildfire MapGIS News, Industry and Subjects in GISAn interactive map published by Esri shows the wildfire locations across the United States which covers the current wildfires raging in central Texas region and in California (click on the fire icon for each location for a popup with the fire name and current amount of acreage burned). The wildfire data is from USGS NHSS as ... read more August 25, 2011 Virginia Quake MapsMapsA magnitude 5.8 earthquake hit Virginia on August 23rd and was felt across a large portion of the eastern side of the United States. The epicenter was located in central Virginia. The last time an earthquake that strong hit the Virginia areas was one reported in May of 1897, a magnitude 5.9 earthquake in Giles County. The best ... read more |
