Hi Everyone,

I just wanted to make a post here to let everyone know about the new EARTH:
MODIS file echo. I'm sure most, if not all of you saw file announcements with
a new file echo called MODIS, and thought, 'What the heck is that?' I
probably would have as well. :)

Below is some information about what MODIS is, and what they are used for.
After the brief description, there is a long list of specifications. I
figured I'd put those towards the bottom, as they are very specific, that's
why they are 'specific'ations, right? :) Sorry, bad attempt at humor there...

Anyway, here is the information about MODIS. They release a photo of the day
of different places on earth. I think they are very interesting and some very
nice pictures. If anyone would like more information on the MODIS project,
take a look at their website at https://modis.gsfc.nasa.gov

-=>snip<=-

MODIS

Moderate Resloution Imaging Spectroradiometer

MODIS (or Moderate Resolution Imaging Spectroradiometer) is a key instrument 
aboard the Terra (originally known as EOS AM-1) and Aqua (originally known as 
EOS PM-1) satellites. Terra's orbit around the Earth is timed so that it 
passes from north to south across the equator in the morning, while Aqua 
passes south to north over the equator in the afternoon. Terra MODIS and Aqua 
MODIS are viewing the entire Earth's surface every 1 to 2 days, acquiring data
in 36 spectral bands, or groups of wavelengths (see MODIS Technical 
Specifications). These data will improve our understanding of global dynamics 
and processes occurring on the land, in the oceans, and in the lower 
atmosphere. MODIS is playing a vital role in the development of validated, 
global, interactive Earth system models able to predict global change 
accurately enough to assist policy makers in making sound decisions 
concerning the protection of our environment.

Specifications

Orbit: 705 km, 10:30 a.m. descending node (Terra) or 1:30 p.m. ascending node 
(Aqua), sun-synchronous, near-polar, circular

Scan Rate: 20.3 rpm, cross track

Swath Dimensions: 2330 km (cross track) by 10 km (along track at nadir)

Telescope: 17.78 cm diam. off-axis, afocal (collimated), with intermediate 
field stop

Size: 1.0 x 1.6 x 1.0 m

Weight: 228.7 kg

Power: 162.5 W (single orbit average)

Data Rate: 10.6 Mbps (peak daytime); 6.1 Mbps (orbital average)

Quantization: 12 bits

Spatial Resolution: 250 m (bands 1-2), 500 m (bands 3-7), 1000 m (bands 8-36) 
Design Life: 6 years

Primary Use        Band      Bandwidth1       Spectral      Required SNR3
                                          Radiance2
Land/Cloud/Aerosols
Boundaries              1      620 - 670      21.8            128
                      2        841 - 876      24.7            201
Land/Cloud/Aerosols
Properties              3      459 - 479      35.3            243
                      4        545 - 565      29.0            228
                      5        1230 - 1250  5.4          74
                      6        1628 - 1652  7.3          275
                      7        2105 - 2155  1.0          110
Ocean Color/
Phytoplankton/
Biogeochemistry        8       405 - 420      44.9            880
                      9        438 - 448      41.9            838
                     10        483 - 493      32.1            802
                     11        526 - 536      27.9            754
                     12        546 - 556      21.0            750
                     13        662 - 672      9.5             910
                     14        673 - 683      8.7             1087
                     15        743 - 753      10.2            586
                     16        862 - 877      6.2             516
Atmospheric
Water Vapor          17        890 - 920      10.0            167
                     18        931 - 941      3.6             57
                     19        915 - 965      15.0            250

Primary Use        Band      Bandwidth1           Spectral      Required
                                            Radiance2   NE[Δ]T(K)4
Surface/Cloud
Temperature          20      3.660 - 3.840       0.45(300K)     0.05
                     21      3.929 - 3.989    2.38(335K)   2.00
                     22      3.929 - 3.989       0.67(300K)     0.07
                     23      4.020 - 4.080    0.79(300K)   0.07
Atmospheric
Temperature          24      4.433 - 4.498       0.17(250K)     0.25
                     25      4.482 - 4.549    0.59(275K)   0.25
Cirrus Clouds
Water Vapor          26      1.360 - 1.390    6.00    150(SNR)
                     27      6.535 - 6.895       1.16(240K)     0.25
                     28      7.175 - 7.475    2.18(250K)   0.25
Cloud Properties      29     8.400 - 8.700       9.58(300K)     0.05
Ozone                 30     9.580 - 9.880    3.69(250K)   0.25
Surface/Cloud
Temperature          31      10.780 - 11.280     9.55(300K)     0.05
                     32      11.770 - 12.270     8.94(300K)     0.05
Cloud Top
Altitude                 33  13.185 - 13.485     4.52(260K)     0.25
                     34      13.485 - 13.785     3.76(250K)     0.25
                     35      13.785 - 14.085     3.11(240K)     0.25
                     36      14.085 - 14.385     2.08(220K)     0.35

 

1 Bands 1 to 19 are in nm; Bands 20 to 36 are in µm
2 Spectral Radiance values are (W/m2 -µm-sr)
3 SNR = Signal-to-noise ratio
4 NE(Δ)T = Noise-equivalent temperature difference

Note: Performance goal is 30-40% better than required 


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