Using IDL with Suomi NPP VIIRS Data

770 views

Published on

Published in: Technology
  • Be the first to comment

  • Be the first to like this

Using IDL with Suomi NPP VIIRS Data

  1. 1. Using IDL with NPP VIIRS Data HDF & HDF-EOS Workshop XV Mark Piper mark.piper@exelisvis.com 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.
  2. 2. Agenda > Overview of VIIRS data > Using IDL with VIIRS data (examples) > Summary / Q&A Presentation files: exelisvis.com/esg/Seminars.aspx HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD 2
  3. 3. About Suomi NPP VIIRS > Overview: http://npp.gsfc.nasa.gov/viirs.html 3
  4. 4. 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: > 375 m pixel size along cross granule 1541 pixels (~578 km) 8241 pixels (~3100 km) > Band comparison: HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD 4
  5. 5. Example #0 > Browse a VIIRS I-Band file with TX_NPP_BROWSER. > View the domain of the data with IDL or Google Earth / NASA World Wind. namespace = 'vis_viirs_' viirs_file string display_domain .kml file HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD 5
  6. 6. Example #1 > Construct a VIIRS I-Band (3,2,1) false color composite image. namespace = 'vis_viirs_' viirs_file string read_dataset make_rgb scale_dataset rgb bytarr [8241,6164,3] HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD 6
  7. 7. Example #1 HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD 7
  8. 8. Example #2 > Construct a cloud mask from VIIRS I-Band imagery. namespace = 'vis_viirs_' viirs_file string read_dataset make_cloudmask scale_dataset mask bytarr [8241,6164] HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD 8
  9. 9. Example #2 HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD 9
  10. 10. 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 HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD 10
  11. 11. Summary HDF5 makes it easy to work with Suomi NPP VIIRS data in IDL! HDF and HDF-EOS Workshop XV 2012-April-19 Riverdale, MD 11
  12. 12. Using IDL with NPP VIIRS Data HDF & HDF-EOS Workshop XV Mark Piper mark.piper@exelisvis.com idldatapoint.com Presentation files: exelisvis.com/esg/Seminars.aspx 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.

×