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General Cartographic Transformation Package (GCTP)
Entry ID: USGS-GCTP
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Summary
Abstract: The General Cartographic Transformation Package (GCTP) is a system of software routines designed to permit the transformation of coordinate pairs from one map projection to another. The GCTP is the standard computer software used by the National Mapping Division for map projection computations.

ftp://edcftp.cr.usgs.gov/software/gctpc/README

Related URL
Link: GET SERVICE > GET SOFTWARE PACKAGE
Description: The C version of GCTP is available here.

Link: GET RELATED SERVICE METADATA (SERF)
Description: The MODIS Level-3 Land products are generated by the MODIS Adaptive Processing
System (MODAPS), located at the NASA Goddard Space Flight Center, as gridded
output in the Integerized Sinusoidal (ISIN) projection. These data products are
then sent to the EDC DAAC for archive and distribution. The ISIN projection is
unique to the MODIS land products, analogous to the Sinusoidal projection
except that the ISIN projection is centered about 0° longitude and special
coefficients are used to flatten the ellipsoid. The ISIN projection was devised
for the Level-3+ products because it employs a tessellation scheme, efficient
organization, and hierarchical management of the multi-resolution data acquired
by the MODIS sensor.

Link: GET RELATED SERVICE METADATA (SERF)
Description: The Geographic Resources Analysis Support System (GRASS) is a Geographic
Information System (GIS) used for data management, image processing, graphics
production, spatial modelling, and visualization of many types of data. It is
free software released under GNU General Public License (GPL). Originally
written by the U.S. Army Construction Engineering Research Laboratories
(USA-CERL, 1982-1995), a branch of the US Army Corp of Engineers, as a tool for
land management and environmental planning by the military, GRASS has evolved
into a powerful utility with a wide range of applications in many different
areas of scientific research. GRASS is currently used in academic and
commercial settings around the world, as well as many governmental agencies
including NASA, NOAA, USDA, the National Park Service, the U.S. Census Bureau,
USGS, and many environmental consulting companies.

Link: VIEW RELATED INFORMATION
Description: The General Cartographic Transformation Package (GCTP) is a system of
software routines designed to permit the transformation of coordinate
pairs from one map projection to another. The GCTP is the standard
computer software used by the National Mapping Division for map
projection computations.

Because of requirements internal to the EROS Data Center, the GCTP software
was converted from FORTRAN to the C programming language, and several new
projections were added. During the conversion process, the software was
tested on the following UNIX systems: Data General running DG/UX Release
5.4R2.01 AViiON, SUN running SunOS Release 4.1.3, and Silicon Graphics
running IRIX Release 5.3 IP7. In addition, the software has also been
verified against the current National Mapping Division (NMD) GCTP
software. This new version, GCTPC, is being made available informally
on a 'user-beware' basis. EDC assumes no responsibility for the accuracy
of the routines in this package.
Service Citation
Originators: USGS
Title: General Cartographic Transformation Package (GCTP)
Provider: USGS
URL: ftp://edcftp.cr.usgs.gov/software/gctpc/
Science Keywords
AGRICULTURE >AGRICULTURAL AQUATIC SCIENCES   [Definition]
AGRICULTURE >AGRICULTURAL CHEMICALS   [Definition]
AGRICULTURE >AGRICULTURAL ENGINEERING   [Definition]
AGRICULTURE >AGRICULTURAL PLANT SCIENCE   [Definition]
AGRICULTURE >ANIMAL COMMODITIES   [Definition]
AGRICULTURE >ANIMAL SCIENCE   [Definition]
AGRICULTURE >FEED PRODUCTS   [Definition]
AGRICULTURE >FOOD SCIENCE   [Definition]
AGRICULTURE >FOREST SCIENCE   [Definition]
AGRICULTURE >PLANT COMMODITIES   [Definition]
AGRICULTURE >SOILS   [Definition]
ATMOSPHERE >AEROSOLS   [Definition]
ATMOSPHERE >AIR QUALITY   [Definition]
ATMOSPHERE >ALTITUDE   [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY   [Definition]
ATMOSPHERE >ATMOSPHERIC ELECTRICITY   [Definition]
ATMOSPHERE >ATMOSPHERIC PHENOMENA   [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE   [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR   [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS   [Definition]
ATMOSPHERE >CLOUDS   [Definition]
ATMOSPHERE >PRECIPITATION   [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION   [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS   [Definition]
BIOSPHERE >TERRESTRIAL ECOSYSTEMS >WETLANDS   [Definition]
BIOSPHERE >TERRESTRIAL ECOSYSTEMS   [Definition]
BIOSPHERE >VEGETATION   [Definition]
CRYOSPHERE >SEA ICE   [Definition]
CRYOSPHERE >SNOW/ICE   [Definition]
HUMAN DIMENSIONS >SOCIAL BEHAVIOR   [Definition]
HUMAN DIMENSIONS >BOUNDARIES   [Definition]
HUMAN DIMENSIONS >ECONOMIC RESOURCES   [Definition]
HUMAN DIMENSIONS >ENVIRONMENTAL IMPACTS   [Definition]
HUMAN DIMENSIONS >PUBLIC HEALTH   [Definition]
HUMAN DIMENSIONS >INFRASTRUCTURE   [Definition]
HUMAN DIMENSIONS >ENVIRONMENTAL GOVERNANCE/MANAGEMENT >LAND MANAGEMENT >LAND USE/LAND COVER CLASSIFICATION   [Definition]
HUMAN DIMENSIONS >NATURAL HAZARDS   [Definition]
HUMAN DIMENSIONS >POPULATION   [Definition]
TERRESTRIAL HYDROSPHERE >GROUND WATER   [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE   [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER   [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY   [Definition]
LAND SURFACE >EROSION/SEDIMENTATION   [Definition]
LAND SURFACE >GEOMORPHOLOGY   [Definition]
LAND SURFACE >LAND TEMPERATURE   [Definition]
LAND SURFACE >LAND USE/LAND COVER   [Definition]
LAND SURFACE >LANDSCAPE   [Definition]
LAND SURFACE >SOILS   [Definition]
LAND SURFACE >SURFACE RADIATIVE PROPERTIES   [Definition]
LAND SURFACE >TOPOGRAPHY   [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY   [Definition]
OCEANS >COASTAL PROCESSES   [Definition]
OCEANS >MARINE ENVIRONMENT MONITORING   [Definition]
OCEANS >MARINE GEOPHYSICS   [Definition]
OCEANS >MARINE SEDIMENTS   [Definition]
OCEANS >OCEAN ACOUSTICS   [Definition]
OCEANS >OCEAN CHEMISTRY   [Definition]
OCEANS >OCEAN CIRCULATION   [Definition]
OCEANS >OCEAN HEAT BUDGET   [Definition]
OCEANS >OCEAN OPTICS   [Definition]
OCEANS >OCEAN PRESSURE   [Definition]
OCEANS >OCEAN TEMPERATURE   [Definition]
OCEANS >OCEAN WAVES   [Definition]
OCEANS >OCEAN WINDS   [Definition]
OCEANS >SALINITY/DENSITY   [Definition]
OCEANS >SEA ICE   [Definition]
OCEANS >TIDES   [Definition]
OCEANS >WATER QUALITY   [Definition]
PALEOCLIMATE >ICE CORE RECORDS   [Definition]
PALEOCLIMATE >LAND RECORDS   [Definition]
PALEOCLIMATE >OCEAN/LAKE RECORDS   [Definition]
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS   [Definition]
SPECTRAL/ENGINEERING >MICROWAVE   [Definition]
SPECTRAL/ENGINEERING >PLATFORM CHARACTERISTICS   [Definition]
SPECTRAL/ENGINEERING >RADAR   [Definition]
SPECTRAL/ENGINEERING >SENSOR CHARACTERISTICS   [Definition]
SPECTRAL/ENGINEERING >ULTRAVIOLET WAVELENGTHS   [Definition]
SPECTRAL/ENGINEERING >VISIBLE WAVELENGTHS   [Definition]
SUN-EARTH INTERACTIONS >SOLAR ACTIVITY   [Definition]
SOLID EARTH >GEOCHEMISTRY   [Definition]
SOLID EARTH >GRAVITY/GRAVITATIONAL FIELD   [Definition]
SOLID EARTH >GEOMAGNETISM   [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES   [Definition]
SOLID EARTH >GEOTHERMAL DYNAMICS   [Definition]
SOLID EARTH >EARTH GASES/LIQUIDS   [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS   [Definition]
SOLID EARTH >TECTONICS >EARTHQUAKES   [Definition]
SOLID EARTH >TECTONICS   [Definition]
SOLID EARTH >TECTONICS >VOLCANIC ACTIVITY   [Definition]
OCEANS >SEA SURFACE TOPOGRAPHY   [Definition]
OCEANS >MARINE VOLCANISM   [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE   [Definition]
SPECTRAL/ENGINEERING >GAMMA RAY   [Definition]
SPECTRAL/ENGINEERING >RADIO WAVE   [Definition]
CRYOSPHERE >FROZEN GROUND   [Definition]
LAND SURFACE >FROZEN GROUND   [Definition]
OCEANS >AQUATIC SCIENCES   [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >HUMIDITY INDICES   [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >TELECONNECTIONS   [Definition]
SPECTRAL/ENGINEERING >X-RAY   [Definition]
CRYOSPHERE >GLACIERS/ICE SHEETS   [Definition]
TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS   [Definition]
HUMAN DIMENSIONS >HABITAT CONVERSION/FRAGMENTATION   [Definition]
SUN-EARTH INTERACTIONS >SOLAR ENERGETIC PARTICLE FLUX   [Definition]
BIOLOGICAL CLASSIFICATION >PLANTS   [Definition]
BIOSPHERE >AQUATIC ECOSYSTEMS   [Definition]
BIOSPHERE >AQUATIC ECOSYSTEMS >WETLANDS
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >CARBON AND HYDROCARBON COMPOUNDS   [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >HALOCARBONS AND HALOGENS   [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >HYDROGEN COMPOUNDS   [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >NITROGEN COMPOUNDS   [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >OXYGEN COMPOUNDS   [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >SULFUR COMPOUNDS   [Definition]
ISO Topic Category
FARMING
BIOTA
BOUNDARIES
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ECONOMY
ELEVATION
ENVIRONMENT
GEOSCIENTIFIC INFORMATION
HEALTH
IMAGERY/BASE MAPS/EARTH COVER
INLAND WATERS
OCEANS
PLANNING CADASTRE
SOCIETY
STRUCTURE
TRANSPORTATION
UTILITIES/COMMUNICATIONS
Service Provider
Earth Resources Observation and Science Center, U.S. Geological Survey, U.S. Department of the Interior

Service Provider Personnel
Name: EROS CENTER
Phone: 605-594-6151
Phone: 800-252-4547
Fax: 605-594-6589
Email: lta at usgs.gov
Contact Address:
LTA Customer Services
U.S. Geological Survey
EROS Center
47914 252nd Street
City: Sioux Falls
Province or State: SD
Postal Code: 57198-0001
Country: USA
Personnel
TYLER B. STEVENS
Role: SERF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Creation and Review Dates
SERF Creation Date: 2005-05-06
SERF Last Revision Date: 2011-12-01
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Last Updated:  September 2014