Reduced-cost Data

NASA Stennis Space Center's Landsat GeoCover Data Site
Worldwide mosaicked Landsat data tiles in MrSID format from circa 1990 and circa 2000. Free, courtesy of NASA SSC. Important note: this imagery should only be considered as imagery, NOT as data. Creation of this mosaic involved data resampling, data blending, color balancing and data compression, i.e., the "digital numbers" that remain no longer have fidelity as reflective measurements made by the satellite.

 

SAXTA (external site)

This University of Maryland project applies peer-to-peer technology to the sharing of high-resolution (c. 30 m) satellite data and derived products. It is self-organizing, self-sustaining and it allows holders of high-resolution scenes to make their data available over the internet and, in turn, obtain data that have already been acquired and can be shared by others.

 

Urban Landsat: Cities from Space (external site)

A website featuring Landsat images of 77 international cities published by the Socioeconomic Data and Applications Center (SEDAC). Each city is linked to a jpeg image of a Landsat visible/IR composite collected by Landsat 5 (pre 1999) or Landsat 7. Most of the image areas are 30x30 km but a few are larger. All images are shown at full resolution (30 m pixel) so the scale (on screen) is equivalent. The jpeg compression causes significant loss of fine detail from the original image. Most of the images are about 200K (~40 seconds via 56K modem). A few are significantly larger.

 

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