MODIS Imagery for AmericaView

 
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WisconsinView is fortunate to have access to the MODIS Direct Readout facility here at the Space Science & Engineering Center. MODIS subset products are prepared daily for AmericaView states by the MODIS-Today team.

Downloads are available for both Aqua and Terra MODIS imagery through FTP pull for 7 days from these two locations:

ftp://ftp.ssec.wisc.edu/pub/eosdb/terra/modis/[folder for date]/subsets/
ftp://ftp.ssec.wisc.edu/pub/eosdb/aqua/modis/[folder for date]/subsets/

File name pattern: example: a1.09051.AV_AL.143.1000m.jpg
a1 = aqua; 09051 = date in yyddd; AV_AL = AmericaView_AlabamaView; 143 = band combination; 1000m = resolution; jpg = file format.

Automated "harvester": if you would like to keep local copies of the files for your StateView and build an archive, I suggest running an automated script that does the downloading for you. I am running a version of this Linux bash script for WisconsinView every day using a "cron" process on a Linux machine. You are welcome to download it and modify it for your needs. Documentation is included in the comments of the file. If you are running Windows XP, try this Windows batch script (Windows XP automation instructions here).

30 products are available: JPEGs and GeoTIFFs are available for each state nearly every day, 15 from Terra, 15 from Aqua. All are Geographic, WGS84, Lat, Lon.

Image Examples from Yesterday (1000m)
[Alaska and Hawaii are outside of our range]:

MODIS Products for AmericaView
Bands 4000m 2000m 1000m 250m 250m
143 True Color JPEG True Color JPEG True Color JPEG True Color JPEG True Color GeoTIFF
214 NIR JPEG NIR JPEG NIR JPEG NIR JPEG NIR GeoTIFF
721 Mid IR JPEG Mid IR JPEG Mid IR JPEG Mid IR JPEG Mid IR GeoTIFF

  MODIS Spectral Bands Used (nm) Comparable Landsat
TM Bands (nm)
Comparable Landsat ETM+ Bands (nm)
Red Band 1: 620-670 Band 3: 630-690 Band 3: 630-690
NIR Band 2: 841-876 Band 4: 760-900 Band 4: 775-900
Blue Band 3: 459-479 Band 1: 450-520 Band 1: 450-515
Green Band 4: 545-565 Band 2: 520-600 Band 2: 525-605
MIR Band 7: 2105-2155 Band 7: 2080-2350 Band 7: 2090-2350

Some caveats:

  • The images are not intended to be science products but rather "quick looks."
  • These images are built throughout the day each time new data are received and involve compositing.
  • Compositing can cause the edge effects.
  • Early in any given day, prior to receiving complete coverage for a state, images will be made but will be blank (all white) or partially blank.
  • Some days only blank or partial images will be available. This is due to satellite pass and sensor geometry and occasional data gaps or interference.
  • You may want to modify your harvester to collect only files larger than a particular file size to filter-out unwanted blank images (that tend to be unusually small).
  • You may want to run your harvester at the end of the day to collect the most complete images available.
  • We have one antenna that collects both Aqua and Terra data, but it defaults to Terra when both are transmitting at the same time.

About the Direct Readout facility:
[General System Status Notes]
[Terra pass schedule and status]
[Aqua pass schedule and status]

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