Subject: PROJECT/CAMPAIGN NLDC
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NASA Landsat Data Collection Project/Campaign Document
The GCLDC collection contains Landsat TM scenes that were purchased by NASA from the Earth Observing Satellite Company (EOSAT) under a special agreement to promote the use of shared data in global change research. The HTFP, the largest component of NASA's Landsat Pathfinder Program, contains Landsat MSS and TM scenes collected over the past 20 years. The goal of the HTFP is to globally map deforestation in the humid tropical forests. The CEES collection is the result of an effort to coordinate data needs among several Federal agencies (e.g., Environmental Protection Agency, Department of the Interior agencies, National Oceanic and Atmospheric Administration, Department of Defense). These Landsat TM scenes were collected for a variety of research projects. Ongoing NASA purchases of Landsat TM data support NASA scientists and their affiliated researchers in programs and projects including the NASA Research and Applications Program; the Global Land Cover Test Sites Project (GLCTS); the Humid Tropical Forest Project; the International Biosphere-Geosphere Programme (IGBP), and the NASA Applications Program.
The NLDC scenes have been screened for cloud cover and band quality resulting in a high grade, high quality data compilation. Only the U.S. Government and its Affiliated Users (USGAU) may order NLDC-archive Landsat TM data with an acquisition date from 10 years old to the present. Otherwise, there are no order restrictions on either the Landsat MSS data or the Landsat TM data contained in the NLDC data set.
HTFP
Coverage Area, Landsat Satellites 1, 2, and 3 (23 kb)
HTFP
Coverage Area, Landsat Satellites 4 and 5 (23 kb)
Ongoing NASA Landsat Data Purchases Coverage Area: Data purchases are in the early stages. The largest portion of ongoing purchases is in support of, but not limited to, the Humid Tropical Forest Project (see the HTFP Coverage Area graphic).
Though the GCLDC contains selected Landsat TM scenes with a temporal range from 1984 to 1993, the bulk of the collection's scenes range from 1989 to 1992.
The GCLDC TM scenes covering tropical forest regions in Brazil, central Africa, and Indonesia were collected for a single epoch to study deforestation utilizing geographic information system (GIS) technology. Other regional studies requiring data for a single epoch included a study of older forest growth in the Pacific Northwest; a study to determine pollution damage to forest sites in eastern Europe; and a study of arid regions in Africa including the Sahel.
Data collected over the Russian Boreal Forest provided multitemporal coverage for studying pollution damage. In addition, Landsat TM data provided multitemporal coverage for study over National Science Foundation (NSF) Long-Term Ecological Research (LTER) sites; for NASA field experiments; and for test sites from a preliminary listing of coverages compiled by the Moderate Resolution Imaging Spectrometer (MODIS) science team to be used as a base for future EOS Program studies.
Test sites for the EOS Program were selected over every Continent, and portions of the data collected over some of these test sites reside in the GCLDC archive. These data may be used for a variety of land cover and land use applications. The original purpose for the collection of test-site data was for the validation of algorithms to be used for processing MODIS and other EOS data with the plan that these data also could be used as part of ongoing studies by the remote sensing data user community (e.g., studies from the IGBP or NSF's LTER program which was established to conduct and facilitate long-term ecological research in the United States in order to further the understanding of general ecological phenomena which occur over long temporal and broad spatial scales; to document long-term experiments and observations; to conduct major synthesis and theoretical efforts; and to provide information for the identification and solution of societal problems).
Most of the world's deforestation has occurred in the following regions: the Amazon Basin, central Africa, and southeast Asia. Mapping deforestation in these three areas accounts for the majority of deforestation activities taking place in closed tropical forests worldwide and accounts for approximately 75 to 80 percent of the current net biotic flux of carbon.
As the largest component of NASA's Landsat Pathfinder Program, the HTFP contains Landsat MSS and TM scenes collected over approximately the last 20 years with the goal to globally map deforestation in the tropical forests. The focus of the project is: (1) to use Landsat data to map deforestation in closed tropical forests at a sub-kilometer resolution for a base period (e.g., 1986); (2) to use Landsat data to quantify and map the rate of deforestation by mapping the change from other time periods (e.g., 1975, 1992); and (3) to create a Landsat data set, to provide science products for distribution in a digital GIS format, and to develop an information management system (IMS) to manage data orders, data archiving, product processing, and product distribution.
The HTFP is a collaborative project between the Institute for the Study of Earth, Oceans, and Space at the University of New Hampshire; the Department of Geography at the University of Maryland; and NASA's Goddard Space Flight Center. Part of NASA's Mission to Planet Earth (MTPE) program and the Earth Observing System Data and Information System (EOSDIS) initiative, funding for HTFP is provided predominantly by NASA with support from the Environmental Protection Agency and from the U.S. Geological Survey's National Mapping Division.
The two university laboratories manage the project and perform the analyses. The University of Maryland is primarily responsible for geographic coverage and analysis of data covering non-Brazilian Amazon areas and areas in central Africa. The University of New Hampshire is primarily responsible for geographic coverage and analysis of data covering areas in the Brazilian Amazon and southeast Asia. The University of New Hampshire also is responsible for selecting, ordering, and archiving project data and for managing all preprocessing of the data. The U.S. Geological Survey's EROS Data Center provides preprocessing support and provides MSS data from the National Satellite Land Remote Sensing Data Archive.
For further information on the HTFP, see the NASA Landsat Pathfinder Project Information web page.
The CEES collection is comprised of Landsat TM data with a temporal range from 1986 to 1994, and is the result of an effort to coordinate data needs among several Federal agencies (e.g., Environmental Protection Agency, Department of the Interior agencies, National Oceanic and Atmospheric Administration, Department of Defense). These Landsat TM scenes were collected for a variety of research projects.
Data purchases are in the early stages with the largest portion of ongoing purchases in support of, but not limited to, the Humid Tropical Forest Project.
See the following Map Projection Parameters tables for an explanation of correlations between projection parameters and map projections (NLDC data are only distributed as currently projected).
Map Projection Parameters: Elements 1 through 15
Elements 1 through 8
-----------------------------------------------------------------------------
| Array Element |
Code and Projection Name|----------------------------------------------------
| 1 | 2 | 3 | 4 | 5 | 6 |7 | 8|
-----------------------------------------------------------------------------
0 Geographic | | | | | | | | |
1 UTM |SMajor|SMinor| | | | | | |
2 State Plane | | | | | | | | |
3 Albers Equal Area |SMajor|SMinor|STDPR1|STDPR2|CentMer|OriginLat|FE|FN|
4 Lambert Conform. Con.|SMajor|SMinor|STDPR1|STDPR2|CentMer|OriginLat|FE|FN|
5 Mercator |SMajor|SMinor| | |CentMer|TrueScale|FE|FN|
6 Polar Stereographic |SMajor|SMinor| | |LongPol|TrueScale|FE|FN|
7 Polyconic |SMajor|SMinor| | |CentMer|OriginLat|FE|FN|
8 Equid. Conic A |SMajor|SMinor|STDPAR| |CentMer|OriginLat|FE|FN|
Equid. Conic B |SMajor|SMinor|STDPR1|STDPR2|CentMer|OriginLat|FE|FN|
9 Transverse Mercator |SMajor|SMinor|Factor| |CentMer|OriginLat|FE|FN|
10 Stereographic |Sphere| | | |CentLon|CenterLat|FE|FN|
11 Lambert Azimuthal |Sphere| | | |CentLon|CenterLat|FE|FN|
12 Azimuthal Equidistant|Sphere| | | |CentLon|CenterLat|FE|FN|
13 Gnomonic |Sphere| | | |CentLon|CenterLat|FE|FN|
14 Orthographic |Sphere| | | |CentLon|CenterLat|FE|FN|
15 Gen. Vert. Near Per. |Sphere| |Height| |CentLon|CenterLat|FE|FN|
16 Sinusoidal |Sphere| | | |CentMer| |FE|FN|
17 Equirectangular |Sphere| | | |CentMer|TrueScale|FE|FN|
18 Miller Cylindrical |Sphere| | | |CentMer| |FE|FN|
19 Van der Grinten |Sphere| | | |CentMer|OriginLat|FE|FN|
20 Hotin Oblique Merc. A|SMajor|SMinor|Factor| | |OriginLat|FE|FN|
Hotin Oblique Merc. B|SMajor|SMinor|Factor|AziAng|AzmthPt|OriginLat|FE|FN|
21 Robinson |Sphere| | | |CentMer| |FE|FN|
22 Space Oblique Merc. A|SMajor|SMinor| |IncAng|AscLong| |FE|FN|
Space Oblique Merc. B|SMajor|SMinor|Satnum|Path | | |FE|FN|
23 Alaska Conformal |SMajor|SMinor| | | | |FE|FN|
24 Goodes Homolosine |Sphere| | | | | | | |
25 Mollweide |Sphere| | | |CentMer| |FE|FN|
26 Interrupt Mollweide |Sphere| | | | | | | |
27 Hammer |Sphere| | | |CentMer| |FE|FN|
28 Wagner IV |Sphere| | | |CentMer| |FE|FN|
29 Wagner VII |Sphere| | | |CentMer| |FE|FN|
30 Oblated Equal Area |Sphere| |Shapem|Shapen|CentLon|CenterLat|FE|FN|
-----------------------------------------------------------------------------
Elements 9 through 15
----------------------------------------------------
| Array Element |
Code and Projection Name|---------------------------
| 9 | 10 | 11 | 12 | 13 |
----------------------------------------------------
0 Geographic | | | | | |
1 UTM | | | | | |
2 State Plane | | | | | |
3 Albers Equal Area | | | | | |
4 Lambert Conform. Con.| | | | | |
5 Mercator | | | | | |
6 Polar Stereographic | | | | | |
7 Polyconic | | | | | |
8 Equid. Conic A |zero | | | | |
Equid. Conic B |one | | | | |
9 Transverse Mercator | | | | | |
10 Stereographic | | | | | |
11 Lambert Azimuthal | | | | | |
12 Azimuthal Equidistant| | | | | |
13 Gnomonic | | | | | |
14 Orthographic | | | | | |
15 Gen. Vert. Near Per. | | | | | |
16 Sinusoidal | | | | | |
17 Equirectangular | | | | | |
18 Miller Cylindrical | | | | | |
19 Van der Grinten | | | | | |
20 Hotin Oblique Merc. A|Long1|Lat1|Long2|Lat2|zero|
Hotin Oblique Merc. B| | | | |one |
21 Robinson | | | | | |
22 Space Oblique Merc. A|PSRev|LRat|PFlag| |zero|
Space Oblique Merc. B| | | | |one |
23 Alaska Conformal | | | | | |
24 Goodes Homolosine | | | | | |
25 Mollweide | | | | | |
26 Interrupt Mollweide | | | | | |
27 Hammer | | | | | |
28 Wagner IV | | | | | |
29 Wagner VII | | | | | |
30 Oblated Equal Area |Angle| | | | |
----------------------------------------------------
where
SMajor Semi-major axis of ellipsoid. If zero, Clarke 1866 in
meters is assumed.
SMinor Eccentricity squared of the ellipsoid if less than zero;
if zero, a spherical form is assumed, or if greater than
zero, the semi-minor axis of ellipsoid.
Sphere Radius of reference sphere. If zero, 6370997 meters is
used.
STDPAR Latitude of the standard parallel.
STDPR1 Latitude of the first standard parallel.
STDPR2 Latitude of the second standard parallel.
CentMer Longitude of the central meridian.
OriginLat Latitude of the projection origin.
FE False easting in the same units as the semi-major axis.
FN False northing in the same units as the semi-major axis.
TrueScale Latitude of true scale.
LongPol Longitude down below pole of map.
Factor Scale factor at central meridian (Transverse Mercator) or
center of projection (Hotine Oblique Mercator).
CentLon Longitude of center of projection.
CenterLat Latitude of center of projection.
Height Height of perspective point.
Long1 Longitude of first point on center line (Hotine Oblique
Mercator, format A).
Long2 Longitude of second point on center line (Hotine Oblique
Mercator, format A).
Lat1 Latitude of first point on center line (Hotine Oblique
Mercator, format A).
Lat2 Latitude of second point on center line (Hotine Oblique
Mercator, format A).
AziAng Azimuth angle east of north of center line (Hotine Oblique
Mercator, format B).
AzmthPt Longitude of point on central meridian where azimuth occurs
(Hotine Oblique Mercator, format B).
IncAng Inclination of orbit at ascending node, counter-clockwise
from equator (Space Oblique Mercator, format A).
AscLong Longitude of ascending orbit at equator (Space Oblique
Mercator, format A).
PSRev Period of satellite revolution in minutes (Space Oblique
Mercator, format A).
LRat Landsat ratio to compensate for confusion at northern end
of orbit (Space Oblique Mercator, format A -- use 0.5201613).
PFlag End of path flag for Landsat: 0 = start of path,
1 = end of path (Space Oblique Mercator, format A).
Satnum Landsat Satellite Number (Space Oblique Mercator, format B).
Path Landsat Path Number (Use WRS-1 for Landsat 1, 2 and 3 and
WRS-2 for Landsat 4, 5 and 6.) (Space Oblique Mercator,
format B).
Shapem Oblated Equal Area oval shape parameter m.
Shapen Oblated Equal Area oval shape parameter n.
Angle Oblated Equal Area oval rotation angle.
NOTES
The following notes apply to the Space Oblique Mercator A projection.
When Landsat-1, -2, -3 orbits are being used, use the following values for the specified parameters:
Parameter 4 099005031.2
Parameter 5 128.87 degrees - (360/251 * path number)
in packed DMS format
Parameter 9 103.2669323
Parameter 10 0.5201613
Parameter 4 098012000.0
Parameter 5 129.3 degrees - (360/233 * path number)
in packed DMS format
Parameter 9 98.884119
Parameter 10 0.5201613