New answers tagged imagery
You cannot avoid changes to the online basemap layer because you do not have control over it. The imagery could be updated at any time - all of it, or a single tile. The imagery is loaded each time you connect, so no, it does not 'freeze' at the date you added it to your map. The only way you can ensure you will be using consistent or specifically dated ...
ASTER and MODIS both have global coverage and are suited for larger scale flood analysis. ASTER has a temporal resolution of 16 days and contains 14 spectral bands in VNIR (15m), SWIR (30m) and TIR (90m). Note that ASTER SWIR data acquired from late April 2008 to the present exhibit anomalous saturation of values and anomalous striping. MODIS has a higher ...
One option I have used is by 1). generating a mosaic dataset 2). using the build footprints tool (radiometry, make sure update boundary is checked) if, during the Build Footprints phase, the boundary polygon created is not following the boundary of your imagery sufficiently, you can edit the polygon to fit more closely, or create an entirely new polygon ( ...
I would check OSSIM http://trac.osgeo.org/ossim/ and perhaps also this years Google Summer of Code project may interest you http://trac.osgeo.org/ossim/wiki/GsocDSMGenerationToolForOSSIM
The short answer is you can't produce a clipped sid image in ArcGIS 10, the format is proprietary. But you should be able to produce a clipped jpeg 2000 (jp2) which is similar. A typical sid compression is 20 to 1. In ArcGIS to get the equivalent compression on a jp2 you would use 5 in the Environment - Raster Storage form compression quality box. (That ...
Yes, I think SFM Toolkit (FOSS)is used for this task. Although I have not used it, it is very well reviewed. I have used Stereo GIS by SimWright and had good success. They may give you a free trial.
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