WorldView 2 image Marmion Marine Park, Western Australia
June 2nd 2012, 11800*12500, 2 m ground resolution, 24.6 km * 25 km
image from Digital Globe "(c) DigitalGlobe, Inc.
Includes copyrighted material of DigitalGlobe, Inc., All Rights Reserved"
work done in january 2013
back to studycases                                                 previous results

Now, using the Panchro channel and a suitable coverage of deep waters areas and of land areas
bands 1, 2, 3, panchro, 4, 5, 6, 7 and 8            become               bands 
1, 2, 3, 4, 5, 6, 7, 8 and 9

Following several attempts using a limited WV2 MULTI and PAN
coverage of Marmion Marine park provided by Simon Allen, CSIRO,
DigitalGlobe provided me on Dec_12th_2012 with this new MULTI+PAN dataset,
which covers 65000 lines at 2 m ground resolution
to provide a good coverage of optically deep water areas and of land areas:

 

It is comprised of 22 tiles over two adjacent full segments

  • MULTI is comprised of
    • 12JUN02025337-M3XS_R01C1-052870327010_01_P001, tiles RO1C1 to R11C1
    • 12JUN02025403-M3XS_R01C1-052870327010_01_P001, tiles R01C1 to R11C1
  • PANCHROMATIC is comprised of
    • 12JUN02025337-P3XS_R01C1-052870327010_01_P001, tiles R01C1 to R11C1
    • 12JUN02025403-P3XS_R01C1-052870327010_01_P001, tiles R01C1 to R11C1
 


 
1 - NO NEED for field data, nor for atmospheric correction
2 - this is demonstrated in this website, using a variety of hyper/multi spectral data
 
Requirements are
1 - homogeneous water body and atmosphere
2 - some coverage of optically deep water
3 - some coverage of dry land
 
Problems are
1 - the precision on estimated depth is found wanting, because the noise-equivalent change in radiance  of accessible data is too high for shallow water column correction work 
2 - radiance data should be preprocessed by the provider at level 1 in order to improve S/N ratio
3 - exponential decay: the deeper/darker the bottom, the poorer the performances
 
So
I keep digging
until suitable data
become available