Changes between Version 13 and Version 14 of Processing/PixelSize


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Timestamp:
Mar 14, 2014 10:25:25 AM (5 years ago)
Author:
stgo
Comment:

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  • Processing/PixelSize

    v13 v14  
    33== Quick reckoner ==
    44
    5 This graph gives the theoretical pixel size at nadir for Eagle and Hawk. Pixel size will be larger at the edges of the swath, so at least to start with you should use a slightly higher value than that given by this graph. Also note that this is primarily across-track pixel size, along-track will vary with the speed of the aircraft. We suggest that most users should use square pixels based on the across-track pixel size, but see the note below regarding along-track pixel sizes.
     5This graph gives the theoretical pixel size at nadir for Eagle, Hawk and Fenix. Pixel size will be larger at the edges of the swath, so at least to start with you should use a slightly higher value than that given by this graph. Also note that this is primarily across-track pixel size, along-track will vary with the speed of the aircraft. We suggest that most users should use square pixels based on the across-track pixel size, but see the note below regarding along-track pixel sizes.
    66
    77This javascript calculator will give the exact value for pixel size given an altitude using the formula from the graph below
     
    99[http://arsf-dan.nerc.ac.uk/pixelsize/pixelsize.html Pixel size (and swath width) calculator]
    1010
    11 [[Image(pixelsizegraph.png)]]
     11[[Image(pixelsizegraph.png, 640px)]]
    1212
    1313Note this is the altitude over the ground, not the altitude from GPS (which is over the spheroid and takes no account of local terrain variation).