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MODIS Airborne Simulator (MAS)


Winter Experiment
Dates: 15 March - 04 April 1999
Location: Northern Midwest, Great Lakes, & Canada
Principal Investigators: Dr. Chris Moeller (UWisc)
Additional Sensors: Camera (RC-10), NAST-I, NAST-M, & S-HIS
Objective: Objective: There are two major objectives in this campaign.
First, to validate atmospheric soundings observed across polar frontal systems.
Second, WINTEX will test the ability of the imaging and sounding sensors to
detect the geometrical and optical properties of clouds, which are particularly
difficult to detect over snow and ice surfaces.

Processing Information
Flights Processed: 10 of 10
Total Flight Tracks:
Total Scanlines:
Level-1B Version: #1
Calibration Type: Final
Calibration Version: WINTEX Mar-99 0.1
Temperature Adjustment: None
Status: Level-1B Data in HDF format is available.

Noted Irregularities

Spectral Information
Spectral Band Configuration
Spectral Response Function Table

Level-1B Data Distribution
Level 1 / Atmosphere Archive and Distribution System (LAADS)
NASA Distributive Active Archive Centers (DAACs)

WINTEX Missions
Click on a Track Map to view a particular mission
March 1999
15 Mar 1999
Flight: 99-050
18 Mar 1999
Flight: 99-051
20 Mar 1999
Flight: 99-053
21 Mar 1999
Flight: 99-054
25 Mar 1999
Flight: 99-055
26 Mar 1999
Flight: 99-056
29 Mar 1999
Flight: 99-057
31 Mar 1999
Flight: 99-058
April 1999
01 Apr 1999
Flight: 99-059
04 Apr 1999
Flight: 99-060
Related Web Sites
Official WINTEX Home Page
NAST-I Home Page
NAST-M Home Page
S-HIS Home Page
NASA Airborne Science Program

Noted Irregularities
  • Banding in port 4 channels was likely due to voltage transients in the preamplifers or power supplies. The banding appears in many different flights and takes on many different patterns. The voltage transients are thought to have been caused by pressure blowoffs in the port 4 dewar. These blowoffs were probably caused by severe aircraft motion, which occured as a result of excessive turbulance experienced throughout the campaign. The dewar was more suseptable to turbulance because during post-deployment inspection, the shockmounts on which the instrument is mounted were found to have been worn. They have subsequently been replaced. Channel 48 is the most sensitive to pressure blowoffs and was therefore effected most severly. Examples-Flight 99-057 track 11, channel 48 and Flight 99-058 track 5, channel 48.
  • Oscillations in channels 35 and 39. The oscillations appear in many flights. They are due to an electrical crosshop, which was caused by a wiring problem within the insrument. Example-Flight 99-051 track 6 channel 39.
  • Transparent banding in chanel 43. This was due to a calibration error that was created when the blackbody counts were recorded incorrectly by the instrument. Example-Flight 99-054 track 1 channel 43.
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Sample Imagery
Click image for full resolution
Flight: 99-055, Track #10
Green Bay & Lake Michigan
Click to load the full resolution image Flight: Direction Indicator
R: 10.10µm
G: 8.30µm
B: 4.95µm