Interesting to see that SAIC has rolled out an online Landsat imagery resource. the company bills it as a web-based processing system delivering custom Landsat imagery directly to the customer desktop. Already openly available by the USGS, the SAIC resource provides value added services using an array of spatial and spectral processing options making the data easier to work with. Processing options enable users to specify:
Scaled Radiances or Top-of-Atmosphere processing levels
Projection, resampling method, and output pixel size
Gap-filling for ETM+ SLC-off scenes
Bands or Multispectral Indices of interest
Output file format
– see more details here or see also http://www.landsatimageplace.com/