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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

Description: The C version of GCTP is available here.

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 0Â° 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.

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/

Service Keywords

DATA ANALYSIS AND VISUALIZATION >VISUALIZATION/IMAGE PROCESSING

Science Keywords

AGRICULTURE >AGRICULTURAL AQUATIC SCIENCES

AGRICULTURE >AGRICULTURAL CHEMICALS

ISO Topic Category

FARMING
BIOTA

Service Provider

DOI/USGS/EROS > Earth Resources Observation and Science Center, U.S. Geological Survey, U.S. Department of the Interior

Service Organization URL: http://eros.usgs.gov/

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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