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Dear all, anyone can tell me how calculate turbidity or other water quality parameters (Chla, CDOM, etc..)using landsat 8. In which way Band 1 can be useful? Thank you so much Cheers

Hi, I am using Modis surface reflectance (MOD/MYD09GQ) product in HDF format and I need to process it in Erdas Imagine 2013 however, when I open it in Erdas following warnig message appears " Corrupt sibling entry". Does anyone please know what it means and what to do about it? Thanks a lot

Hello everyone, I tried to generate DEM from stereo ASTER image (AST_L1A) using ERDAS Leica Photogrammetry Suit 2011 version. For this purpose, I used orbital pushbroom ASTER geometric model for block creation. But when I added the ASTER image (HDF format) in block this show error message (ast_l1a_530.hdf> is not an appropriate file for this type of sensor model). I am not able to figure out the problem. If anyone can help me it would be greatly appreciated.

Hi, for my student research project, I like to create an "at surface" - NDVI. Therefore I did: 1 _ Atmospheric correction with ATCOR 2D of all ETM+ Bands (1 - 7) 2 _ Deleting Band 6 3 _ DN to Reflectance with the Landsat7 Reflectance Tool of Erdas 2011. Now I discover some negative reflectance values in the imagery. The values are arround -0,01. I tried to enforce positive reflectance values by creating a model in Erdas model maker. For every condition I used a seperate function: CONDITIONAL { (Band1 <= 0 ) 0 } CONDITIONAL { (Band2 <= 0 ) 0 } CONDITIONAL { (Band3 <= 0 ) 0 } ... But after running the model, everything is 0. It would be of great help, if you could point me to the right direction. Thanks! Nicoyonic