Example MODIS "True Colour" Image

MODIS, the Moderate Resolution Imaging Spectroradiometer, will initially be carried aboard the EOS-AM and EOS-PM satellites as part of NASA's Earth Observing System (EOS). The first satellite to carry MODIS is AM-1, named Terra, launched 18 December 1999. The MODIS scanner has 36 channels, covering those parts of the spectrum currently imaged by AVHRR and SeaWiFS plus a great deal more. Spatial resolution in channels 1 and 2 is sixteen times better than AVHRR or SeaWiFS and in channels 3 to 7 four times higher. All other channels are the same spatial resolution as AVHRR or SeaWiFS.

For a good example of the results from MODIS have a look at NASA's Blue Marble images and animations.

MODIS will be received and archived here at Dundee Satellite Receiving Station by a new system specially designed for the fast data rates and high volume of data.

We have a MODIS FAQ that should cover most of your questions.

For further information see NASA's MODIS home page

Data formats

MODIS data will be distributed from Dundee in the HDF-EOS Level-1B format. For more details please see our MODIS FAQ document.

The downlink data format is documented in our MODIS Packet Format document.

Images

Spectral bands

CZCS, AVHRR SeaWiFS and MVISR channels are shown for comparison:

Primary Use Band Bandwidth (nm) Colour CZCS AVHRR SeaWiFS MVISR
Land / Cloud Boundaries 1 620 - 670 red 1 1
2 841 - 876 2 2
Land / Cloud Properties 3 459 - 479 aqua 1
4 545 - 565 green
5 1230 - 1250
6 1628 - 1652
7 2105 - 2155
Ocean Color / Phytoplankton / Biogeochemistry 8 405 - 420 violet 1
9 438 - 448 aqua 2 7
10 483 - 493 blue 3 8
11 526 - 536 green 2
12 546 - 556 green 3 5 9
13 * 662 - 672 red 4 1 6
14 * 673 - 683 red
15 743 - 753 red 5 2 7
16 862 - 877 8
Atmospheric Water Vapor 17 890 - 920 10
18 931 - 941
19 915 - 965
Primary Use Band Bandwidth (µm) CZCS AVHRR SeaWiFS
Surface / Cloud Temperature 20 3.660 - 3.840 3 3
21 3.929 - 3.989
22 3.929 - 3.989
23 4.020 - 4.080
Atmospheric Temperature 24 4.433 - 4.498
25 4.482 - 4.549
Cirrus Clouds Water Vapor 26 1.360 - 1.390
27 6.535 - 6.895
28 7.175 - 7.475
29 8.400 - 8.700
Ozone 30 9.580 - 9.880
Surface/Cloud Temperature 31 10.780 - 11.280 4 4
32 11.770 - 12.270 5 5
Cloud Top Altitude 33 13.185 - 13.485
34 13.485 - 13.785
35 13.785 - 14.085
36 14.085 - 14.385

Notes

Resolution: Bands 1 and 2 are 250m resolution, bands 3 to 7 are 500m; the rest are 1km.

Bands 13 and 14 both have a high detector and a low detector, giving increased sensitivity.

Bands 21 and 22 cover the same part of the spectrum but have different saturation points. Channel 21 saturates at about 500 K, and channel 22 saturates at about 335 K. Channel 22 is also less noisy.


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