USGS 7.5 minute (10 Meter) Digital Elevation Models (DEM's)
Metadata: ...
A USGS DEM can be classified into one of four levels of quality. This is due to the multiple methods of data collection, and certainty in the data.
DEM level DEM series Production process Comments Level 1
7.5-minute
30-minute ...
Figure 2. USGS geologic map.
Figure 3. Landsat 7 satellite image from which land cover information can be derived.
Figure 4. Satellite image data in figure 3 have been analyzed to indicate classes of land uses and cover.
USGS DRG Processing Methodology
By Brian May, SJRWMD
The St. Johns River Water Management District's GIS Data Distribution Information website is home to more than 15 GB of GIS data, all available for download from the GIS FTP site.
USGS MIDDLE RIO GRANDE BASIN STUDY - STATEMENT OF INTEREST
Dave Hester
USGS - Rocky Mountain Mapping Center
dhester@usgs.gov
(303) 202-4318 ...
USGS Outreach
The mission of the U.S. Geological Survey's Education Program is to educate and inform data users in the use and application of USGS products and services. This information-rich website supports this mission.
USGS
The USGS uses DLG's and DEM's to make up quad sheets.(MAPS) DLG's are digital Line Graphs that are vector based maps used to represent roads and streams.
USGS- United States Geological Survey. The USGS is an organization geared toward providing reliable scientific information to describe and understand the Earth; minimize loss of life and property from natural disasters; manage water, biological, ...
USGS : United States Geological Survey.
UTM: Universal Transverse Mercator map projection.
About paradigm IT ...
USGS United States Geological Survey
V
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Water Supply Well A service well used to provide water for drilling operations and enhanced recovery projects.
The USGS map center in Reston, VA can be reached by phone at 1-800-USA-MAPS
*(note: section numbers are only included on larger scale maps).
Use the table of contents to the upper left or follow this link to the next page.
USGS 1:250,000 ASCII DEM data for the United States
This is the original USGS data format. USGS ASCII DEM format is not particularly good as a data format because it is ASCII.
USGS Home
Contact USGS
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Northern Prairie Wildlife Research Center ...
USGS Sites
Digital Raster Graphics
DRGs for the San Francisco Bay Area (free)
DRGs for Alaska (free) ...
USGS, 1987. Digital Elevation Models, Data Users Guide 5, US Department of the Interior, USGS, Reston, VA. Describes the creation and data structures of USGS DEMs in detail.
DISCUSSION AND EXAMINATION QUESTIONS ...
USGS Center for LIDAR Information Coordination and Knowledge
Aerial Laser Scanning
LIDAR technology: Remote sensing of the atmosphere and flying objects using lasers ...
USGS GIS Provides an overview of GIS
Aerial archive links (U. Wien) An rich site dealing with archaeological topics, including use of aerial and satellite imagery
Bibliography for Burgundy Archaeology Study: ...
The USGS decided to appeal for help at a conference in 1976. John Snyder, while on vacation, had attended this conference. The USGS appealed for help and his newly purchased pocket calculator were all he needed to give his old hobby another shot.
Some USGS software uses a set of 25 different Datums and 20 Ellipsoids.
The GeoTIFF standard has around 120 Datums and 35 Ellipsoids, with 978 Projected Coordinate Systems.
The official USGS DEM format, although destined to become an antique, is still widespread. A lot of GIS software reads some variant of this format directly.
Geologic Div. (USGS); Geospatial data; Graphic digitization
GDA
Geographic Data Analysis System ...
Version 5.0.7g: USGS DEM Support
Version 5.0.6i: New Line Editor Tools
Version 5.0.5e: New Vector Smoothing Functions ...
In reference to data, the geographic and tabular data files obtained from the USGS that may include base catagories such as transportation, hydrography, conours, and public land survey boundaries.
I think I found the equations in Snyder (1987) Map Projections - A Working Manual, USGS Prof. Paper 1395 (or from the other book located next to it on our library shelf, can't recall the name right now).
Geological Survey (USGS).
3. The format of the USGS digital elevation data sets. DGM Digital Geospatial Metadata. DGM was approved in June 1994 by the Federal Geographic Data Committee (FGDC).
Later, the USGS used the polyconic projection to create thousands of topographic quadrangles. This projection was used by the USGS until the 1950's. Other agencies began to use the Mercator cylindrical projection in the early twentieth century.
Examine the attributes of the USGS terrain model
Run the Clip_3D model from the GSD_3d_Cities toolbox
Set the extent in this model to be Same as View Extent ...
FREE Global GIS Landsat images from USGS
Free GIS and Remote Sensing data on Global scales
USGS Global Seamless Map Server
Africa Maps, Layers and data - Totally FREE !
World Water and Climate Atlas
CRU TS 2.1 Global Climate Database ...
Geological Survey (USGS) and the Department of Agriculture (USDA) have established standards for the production of digital orthophotoquads. The following is a list of the major standards: ...
The Rocky Mountain Mapping Center at the USGS has a good collection of links
John Savard's introduction to map projections is very comprehensive. Don't overlook the many other interesting resources in his home page.
: USGS, DOT, County agencies, etc.) The federal government has recently developed the National Aerial Photography Program (NAPP) in which states that desire to have their counties flown may split the cost with the Federal government.
" page contains text which is displayed at the following USGS website. The text was reformatted to best meet the needs of Global GIS users.
The "What is ArcView?
USGS in conjunction with numerous other groups have established a raster/grid-based referencing schema for the globe using Lat/Lon WGS84-1m, 10m, 30m, 90m and 1km patterns.
5-minute quads are the most commonly used maps published by the USGS. They cover 7.5 minutes of longitude and latitude and are available for all areas of the United States except for non-urban areas of Alaska.
The digital format standards published by USGS for exchange of cartographic data files and for which Digital Line Graph data sets are delivered by USGS. Digital Line Graph files from the U.S. Geological Survey.
DLG (Digital Line Graph) format, used by the USGS for supply of vector information
DRG (Digital Raster Graphics), is the description that the USGS gives for the distribution of scanned map sheets ...
The NGS and the US Geologic Survey (USGS).
USACE district offices.
The US Department of the Interior, Bureau of Land Management.
State and local government civil-engineering or survey offices.
Other nations.
What Do Maps Show, USGS Leaning Web
Exploring Maps, USGS Leaning Web
Maps and Map Reading, University of Missouri-Kansas City Geosciences Department
Map and Compass, Search and Rescue Society of British Columbia
Using UTM Coordinates, Map Tools ...
LANDSAT-7: TASSCAP factors cited from: DERIVATION OF A TASSELED CAP TRANSFORMATION BASED ON LANDSAT 7 AT-SATELLITE REFLECTANCE Chengquan Huang, Bruce Wylie, Limin Yang, Collin Homer and Gregory Zylstra Raytheon ITSS, USGS EROS Data Center Sioux Falls, ...
The polyconic projection was used for most of the earlier USGS topographic quadrangles. The projection is based on an infinite number of cones tangent to an infinite number of parallels. The central meridian is straight.
Data files containing vector representations of cartographic information derived from USGS maps and related sources.
The United States Geological Survey (USGS) DEM is a specific data product that adheres to standards defined by the National Spatial Data Infrastructure (NSDI). USGS DEMs can be downloaded for use with ArcGIS 3D Analyst.
I frequently choose to use the Degrees and Decimal Minutes format, even though the USGS maps I'm using are marked in Degrees, Minutes and Seconds. The markings on the map are all at either 0, 15, 30, or 45 seconds.
thematic, reference maps, USGS maps
* Limitations apply
** United States Geological Survey - the supplier of base and thematic maps covering the United States of America.
The following maps show Canada projected in different ways: ...
DLG (Digital Line Graph) - (1) A digital data format used by the USGS for large scale digital topographic maps. (2) A digital data file standard published by the USGS for exchanging digital cartographic data files.
...
Quarter-Quad: Refers to a map sheet size that is one-quarter of a 7.5 minute USGS quadrangle. DOQQ is a digital orthophoto quarter quad, a map product @ 1=1,000' used by the USGS and many statewide programs.
A well-known map series is the USGS 7.5-minute topographic quadrangle. Each map in this map series covers 7.
Guided to gather: toy plane upgraded with telemetry; GPS/INS and infrared optical sensors propel USGS's transformation of a remote-controlled...
by Vanessa Espinar
CAST Navigation GPS/INS simulator ...
The outline is generally defined by latitude or longitude. Typically refers to USGS topographic maps or to a map sheet published by the U.S. Geological Survey. Also known as a topographic or topo map.
Base Maps--Include streets and highways; boundaries for census, postal, and political areas; rivers and lakes; parks and landmarks; place names; and USGS raster maps.
For this reason, digitizing a USGS 7.5 minute quad map can not yield a positional accuracy of better than plus or minus 40 feet. At this scale, one inch on the map equals 24,000 inches on the ground.
Coordinates: A set of numbers that describe your exact location on the earth's surface. Latitude/longitude (lat/long) coordinates are the most typical lines of reference and are an important part of the USGS topographical mapping system.
Geological Survey (USGS) topographical quad maps.
Boating and Fishing: Recreational boaters without DGPS equipment will enjoy safer, more accurate navigation around sandbars, rocks, and other obstacles.
- Vector: ASCII, ARC/INFO ungenerate, ARC/INFO E00, ArcView SHAPE (with topology correction), BIL, DLG (U.S.), DXF, DXF3D, GMT, GPS-ASCII, USGS-DEM, IDRISI, MOSS, MapInfo MIF, TIGER, VRML
- point data (called sites) ...
A very useful resource for retrieving latitude and longitude (including minutes and seconds) for a specific place or point of interest (even libraries and parks) in the U.S. Also provides the name of the 7.5' USGS topographic map for that point.
I have chosen the easiest way to find free elevation data in grid format: searched for DEM data on the Internet and downloaded the Concrete West quadrangle of Washington state (the first complete quad on the top left of figure 6) from the USGS ...
National States Geographic Information Council (NSGIC)
Open Geospatial Consortium, Inc.
Planet Geospatial - feed aggregator for GIS related blogs.
USGS GIS Poster - Frequently cited "What is GIS" poster.
DLGs supply users with the digital version of information printed on USGS topographical quadrangle maps. domain System context: A class of systems that have similar requirements and capabilities.
 See also: Information, GIS, Geographic, Mapping, Geographic Information
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