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[mget-help] clipping a raster downloaded with MGET changes no data and maxmium values of aqua_CHL_chlor_a


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  • From: Victoria Gonzalez Carman <>
  • To: Jason Roberts <>,
  • Subject: [mget-help] clipping a raster downloaded with MGET changes no data and maxmium values of aqua_CHL_chlor_a
  • Date: Thu, 16 Feb 2017 12:29:25 -0300
  • Authentication-results: oit.duke.edu; spf=pass
Dear Jason, how are you? I hope you are doing well. 

I used MGET to download raster images of surface chlorophyll clipped at the Southern Hemisphere. I realized that the clipped images have ranges of values that are different from the original complete images (in NetCDF format) downloaded from the Ocean Color website. Besides, the no_data values also change. 

For example, 

Original raster image (not clipped):
range of values (min - max): 0.01 - 35.6 mg/m3. 
no data: -32767

Clipped images
range of values (min - max): 0.08 - 95.3 mg/m3. 
no data: -3,40282346639e+038

What is weird is that the maximum values increases a lot, and that the nodata value also changes. 

I have read in some forums that maybe there is something wrong with the resampling procedure used by arcmap, so I tried to change the re-sampling options in the Environment section but I continue having the same problem. 

I also tried re-scaling the raster, but now the original and the clipped image does not look like the same using the same symbology options, which it makes me feel insecure about this procedure. 

I will appreciate your help with this problem, and I apologize if my question is too simple.  

Best regards

--
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Dra. Victoria González Carman
Instituto de Investigaciones Marinas y Costeras (IIMyC - CONICET)
Proyecto Ecología pesquera - INIDEP
Aquamarina- PRICTMA
Mar del Plata, Argentina. 
http://www.ecologiapesquera.com.ar
Skype: vgcarman
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