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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|03B|09lack |03P|09anther|03(|09RCS|03)|07

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