More Free Data
Because Landsat has no restrictions on the redistribution of its data,
there are many online resources for reduced-cost Landsat data. Find
out more below.
- The Global Land Cover Facility
(GLCF) (external link)
- The University of Maryland's 's Global Land Cover Facility (GLCF) offers
over 28,000 Landsat scenes for free. The GLCF archive includes all
of the Landsat GeoCover data, therefore, at least one image from
any where in the world (within Landsat coverage boundaries), except
for Antarctica, is available here. This site is an immense resource.
- NASA's Landsat Ecosystem Disturbance Adaptive Processing System (LEDAPS)
project is creating a record of forest disturbance and regrowth
for North America from the Landsat satellite record, in support
of the carbon modeling activities. LEDAPS relies on the decadal
Landsat GeoCover data set supplemented by dense image time series
for selected locations. Imagery is first atmospherically corrected
to surface reflectance, and then change detection algorithms are
used to extract disturbance area, type, and frequency. Reuse of the MODIS
Land processing system (MODAPS) architecture allows rapid throughput
of over 2200 MSS, TM, and ETM+ scenes. Initial ("Beta") surface
reflectance products are currently available for testing, and initial
continental disturbance products will be available by the middle
Orthorectified Landsat Data at USGS
- The USGS freely offers the Landsat Orthorectified data collection
which consists of a global set of high-quality, relatively cloud-free
orthorectified MSS, TM and ETM+ imagery from Landsats 1-5 and 7.
Datasets include those selected and generated through NASA's Commercial
Remote Sensing Program, as part of a cooperative effort between
NASA and the commercial remote sensing community to provide users
with access to quality-screened, high-resolution satellite images
with global coverage over the Earth's land masses. It also includes the new generation Global Land Survey (GLS) Landsat data with even better geometric accuracy (~18 m).
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