Hi Ted, I confirm that the effective bandwith has been integrated (in Nov 2012) to compute the Physical gain (for pan,ms 4bands, ms 8 bands) and use to convert from DN to Luminance, see the code here :
http://hg.orfeo-toolbox.org/OTB/file/51a7463b7c0b/Code/IO/otbWorldView2ImageMetadataInterface.cxx#l500 Concerning your issue, you can check firstly if the Top Of Atmosphere reflectance is OK. I think that the problem is related to the conversion from toa to toc reflectance. There was recently a contribution on otb mailing list with a new code based on the SMAC method to perform atmospheric correction: http://www.cesbio.ups-tlse.fr/fr/telech_SMAC.htm We planned to integrate it in a next OTB release but it is already available on bitbucket: https://bitbucket.org/grizonnetm/atmotb To understand exactly where is the problem, can you give us also more info on the ID which is not supported in OTB (where did you notice this in OTB?) and what exactly must be changed manually in your case? Thank you in advance. Regards, Manuel 2013/12/17 Ted <[email protected]> > Hi Julien and Manuel, > > Yes, GetPhysicalGain appears to grab "AbsCalFactor" and the bias might be >> set to 0, but I don't see where it grabs "effectiveBandwidth" from the >> metadata. This is needed to convert to WV-2 multispectral bands to TOA >> radiance. Again, see p.9 of >> > > Can anybody confirm if the missing 'effective bandwidth' has been > integrated into the code now and the processing has been corrected? Maybe > somebody can place a link to the code where the toa and toc computations > are done. I can confirm that the official Digital Globe document cited by > dcd provides the correct equations for WV2: > > >> http://www.digitalglobe.com/downloads/Radiometric_Use_of_ >> WorldView-2_Imagery.pdf >> > > With the current version of OTB (3.20.0) I receive maximum toa refectances > of 1.0 for some WV2 bands. However, this seems to be wrong since 1.0 would > mean 100 % of reflected light. Also the maximum toc values are for some > bands larger and for some bands smaller than the maximum toa values. > > Concerning the bandID 'MS1', to my knowledge this ID refers to 4-band WV2 > products while 'Multi' refers to the 8-band products. $-band products > include only the bands blue, green, red and NIR and they are quite common. > However, with OTB version 3.20.0 'MS1' is still not supported and must be > manually changed. > > T > > > -- Manuel Grizonnet -- -- Check the OTB FAQ at http://www.orfeo-toolbox.org/FAQ.html You received this message because you are subscribed to the Google Groups "otb-users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/otb-users?hl=en --- You received this message because you are subscribed to the Google Groups "otb-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
