New answers tagged imagery
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.
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 - ...
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 ...
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.
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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