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When this question was submitted, there was no support for the recent sensor of the Landsat family. However, according to http://trac.osgeo.org/grass/changeset/61314, wihch is GRASS GIS' official project management system, the i.atcorr module in GRASS 7, supports for Landsat8 imagery since end of July 2014.


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You may use the USGS WMS: Here are the links for their aerial 1ft and 1m service (note, sometimes they are down): The National Map - Service Endpoints * USGS 1 foot imagery - http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EROS_Ortho_1Foot/ImageServer/WMSServer?request=GetCapabilities&service=WMS * USGS 1 meter imagery - ...


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Before using the Moasic Dataset, I did not have the confidence to perform them until yesterday and gave a try. Now I have play it around and now I had to figure it out... Not sure the workflow is but here is what I did: Create mosaic dataset add rasters build footprints build seamlines Remove the dataset from ArcMap Run build overviews on the dataset ...


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In QGIS, you can use Raster Calculator with the following calculation: ("your_raster" != -32768) * "your_raster" With this calculation, if the cell value is -32768 you will get a 0 in that cell and if it is different from -32768 the cell will keep the value it had.


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I recently discovered an ArcMap answer to my question: The image analysis window has swipe tool which is exactly the tool I was after. http://i.imgur.com/h5rBUkQ.png



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