using idl with suomi npp viirs data
TRANSCRIPT
Using IDL with NPP VIIRS Data
HDF & HDF-EOS Workshop XV
Mark Piper
[email protected] idldatapoint.com
The information contained in this document pertains to software products and services that are subject to the controls of the Export Administration Regulations (EAR). The recipient is responsible for ensuring compliance to all applicable U.S. Export Control laws and regulations.
Agenda
> Overview of VIIRS data
> Using IDL with VIIRS data (examples)
> Summary / Q&A
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Presentation files: exelisvis.com/esg/Seminars.aspx
HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD
About Suomi NPP VIIRS
> Overview: http://npp.gsfc.nasa.gov/viirs.html
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VIIRS data overview
> Data from NOAA CLASS site (http://www.class.ngdc.noaa.gov)
> VIIRS I-Band (imaging channel) EDR (level 2); single HDF5 file
> I(1,2,3,4,5) and GEO info (Longitude, Latitude, Height, etc.)
> Four granules:
> Band comparison:
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375 m pixel size granule
8241 pixels (~3100 km)
1541 pixels (~578 km)
cross
alo
ng
HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD
Example #0
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namespace = 'vis_viirs_'
display_domain
viirs_file string
.kml file
> Browse a VIIRS I-Band file with TX_NPP_BROWSER.
> View the domain of the data with IDL or Google Earth / NASA World Wind.
HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD
Example #1
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namespace = 'vis_viirs_'
make_rgb
viirs_file string
rgb bytarr [8241,6164,3]
scale_dataset
read_dataset
> Construct a VIIRS I-Band (3,2,1) false color composite image.
HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD
Example #1
7 HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD
Example #2
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namespace = 'vis_viirs_'
make_cloudmask
viirs_file string
mask bytarr [8241,6164]
scale_dataset
read_dataset
> Construct a cloud mask from VIIRS I-Band imagery.
HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD
Example #2
9 HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD
References
Here are a few references that I found helpful in making this presentation.
> Suomi NPP Science Documents:
http://npp.gsfc.nasa.gov/science/documents.html
> About VIIRS:
http://npp.gsfc.nasa.gov/viirs.html
http://www.nesdis.noaa.gov/jpss/instruments.html
> Landsat 7 Automatic Cloud Cover Assessment:
http://landsathandbook.gsfc.nasa.gov/pdfs/ACCA_SPIE_paper.pdf
10 HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD
Summary
HDF5 makes it easy to work with Suomi NPP VIIRS data in IDL!
11 HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD
Using IDL with NPP VIIRS Data
HDF & HDF-EOS Workshop XV
Mark Piper
[email protected] idldatapoint.com
The information contained in this document pertains to software products and services that are subject to the controls of the Export Administration Regulations (EAR). The recipient is responsible for ensuring compliance to all applicable U.S. Export Control laws and regulations.
Presentation files: exelisvis.com/esg/Seminars.aspx