Global Land Survey(GLS)
|
The Global Land Survey (GLS) collection of Landsat imagery is designed to meet a need from scientists to use a carefully coordinated collection of high resolution imagery for global modeling, including for the climate and carbon cycles. GLS replaces GeoCover, which was collected first into three epochs around 1975, 1990 and 2000. The GLS collection improves upon GeoCover by using more accurate elevation data (SRTM) for terrain correction and also by adding another epoch centered around 2005. Imagery from all seven Landsat sensors, plus the Landsat experimental sensor, ALI, are included in the collection. See Table 1 for which sensors appear where, and coverage and status.
|
|
| Epoch |
Sensors |
Coverage |
ESDI |
FTP |
Hard Media |
| 1975 |
MSS |
map,list |
not yet |
not yet |
not yet |
| 1990 |
TM |
map, list |
yes |
yes |
not yet |
| 2000 |
ETM |
map, list |
yes |
yes |
not yet |
| 2005 |
TM, ETM, ALI |
map,ali zoom, list |
not yet |
not yet |
not yet |
Availability: GLS 1975, 1990, 2000, and 2005 are available to the public for free at the US Geological Survey. The GLCF also distributes GLS through the Earth Science Data Interface (ESDI), through open FTP and distributes whole epochs through hard media orders. The GLS scenes are band separate, in UTM coordinates, WGS-84 datum, are distributed in GeoTIFF format, and are compressed using Gzip. The current status of the availability of GLS epochs through the GLCF is shown in Table 2.
| Epoch |
Number of scenes |
Total size |
ETM+ scenes |
TM scenes |
MSS scenes |
ALI scenes |
| 2005 |
8651* |
1.64 TB* |
6076* |
2034* |
none |
541* |
| 2000 |
8756 |
2.18 TB |
8756 |
none |
none |
none |
| 1990 |
7375* |
975 GB* |
none |
7375* |
none |
none |
| 1975 |
7525* |
250 GB* |
none |
none |
7525* |
none |
* Sizes are subject to change, depending on 'final' versions from USGS. GLS 1975 collection estimates are based upon GeoCover. The GLCF shall endeavor to provide complete collections.
|
How to Cite This Data Set
|
|
Citation Format:Author (Publication Date), Collection Name, Epoch, Sensor name, Image Name, Publisher, Publisher Location.
Citation Parameters Example:
Author: USGS Publication Date: 2009 Collection Name: Global Land Survey
Epoch: 1975, 1990, 2000 or 2005
Sensor name: Landsat MSS, TM, ETM+ or EO-1 ALI
Image Name: {specify 30 or 60} meter scene{specify ID from file name or naming convention} Publisher: United States Geological Survey Publisher Location: Sioux Falls, South Dakota USGS 2009, Global Land Survey , 2000, Landsat ETM+, 30m scene p102r062_7dx19991002, USGS, Sioux Falls, South Dakota.
|
|
Intellectual Property Rights
|
Use is free to all if acknowledgement is made; effectively held by University of Maryland; but
ultimately held by US public.
As a courtesy, please credit the Global Land Cover Facility (GLCF) as
the source for this data set in some manner. Our suggestion: Source for this
data set was the Global Land Cover Facility, www.landcover.org.
