C Technologies Mobile Information Collector C-Pen Manual de usuario Pagina 64

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NGS / NOAA GPS Site
The U.S. Department of Transportation s Civil GPS Service has designated NOAA to be the federal agency responsible
for providing accurate and timely Global Positioning System (GPS) satellite ephemerides ( orbits ) to the general public.
http://ngs.noaa.gov/GPS/GPS.html
Satellite Predictor
Naval Air Warfare Center W eapons Division, China Lake, CA
This utility shows what satellites are visible from a given location at a specified time
http://sirius.chinalake.navy.mil/satpred/
Tycho - U.S. Naval Observatory
Computes GPS/GLONASS Satellite Position based on local latitude and longitude.
http://tycho.usno.navy.mil/gps-altaz.html
U.S. Army - Construction Engineering Research Laboratory (CERL)
The home of the GRASS public domain GIS, the Open-GIS (OGIS) foundation, also spatial modeling information.
http://www.cecer.army.mil/
U.S. Bureau Land Management
Includes a GIS page with data and information relevant to land management.
http://www.blm.gov/
U.S. Bureau of the Census
General information and access TIGER census data and much other statistical information for the U.S.A.
http://www.census.gov/
U.S. Coast Guard (official GPS site)
Provides DGPS and GPS status and almanac information.
http://www.navcen.uscg.mil/
http://www.nis-mirror.com (mirror site)
U.S. Department of the Interior
Provides a gateway to all of the U.S. government agencies responsible for conservation and natural resource
management.
http://info.er.usgs/doi/doi.html/
U.S. Environmental Protection Agency
Includes information on projects using GIS such as their National Estuary Program. Also some information on software
and data.
http://www.epa.gov/
U.S. Federal Geographic Data Committee
This agency is responsible for coordinating the survey, mapping and spatial data activities of various federal agencies.
Promotes the Spatial Data Transfer Standard (SDTS). Includes links to all the U.S. National Spatial Data Infrastructure
(NSDI) sites.
ftp://fgdc.er.usgs.gov/gdc/html/fgdc.htm
U.S. Fish and Wildlife Service
Inventory that provides access to GIS data. Supports the U.S. National Wetlands a relating to US Wetlands in a number
of different formats.
http://www.fws.gov/data/gps.html
U.S. Geological Survey
Provides an overview of GIS technology.
http://info.er.usgs.gov/research/gis/title.html
USGS Geographic Names Information System
The Geographic Names Information System (GNIS), developed by the USGS in cooperation with the U.S. Board on
Geographic Names (BGN), contains information about almost 2 million physical and cultural geographic features in the
United States.
http://www-nmd.usgs.gov/www/gnis/gnisform.html
ftp://www-nmd.usgs.gov/pub/gnis (FTP format)
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