Odyssey THEMIS IR Experiment Data Record (IREDR)
IREDR – Infrared Experiment Data Record
Instrument: Thermal Emission Imaging System
PDS Data Set ID: ODY-M-THM-2-IREDR-V1.0 (in data directories odtie1_****) DOI: 10.17189/1520426
For more information about THEMIS IREDR products, see the Data Set Catalog File.
For more information about all THEMIS products, see the THEMIS Product SIS.
The Thermal Emission Imaging System (THEMIS) Infrared Experiment Data Record (IREDR) data products contain the raw thermal infrared observations and their associated calibration images. Data is translated into a raw image QUBE. The process returns an individual spectral image QUBE containing raw Digital Number (DN), with missing data filled and an attached PDS label. Each QUBE header includes basic parameters describing the observation and various telemetry information associated with the observation.
THEMIS IR images are acquired at selectable image lengths and in combinations of ten selectable bands (enumerated in the table below). The image width is 320 pixels (32 km, based on the nominal 400 km mapping orbit) and the length is variable, in multiples of 256 line increments, with a minimum and maximum image lengths of 272 and 65,296 lines respectively (27.2 km and 6,530 km, based on the nominal mapping orbit). The IR focal plane is covered by ten ~1 μm-bandwidth strip filters, producing ten band images with bands 1 and 2 having the same wavelength range.
In addition to the typical infrared images, additional images called “reset” and “shutter” images are collected throughout each orbit for calibration purposes.
THEMIS available infrared bands:
|
Band Numbers |
Center (μm) |
FWHM* (μm) |
|
IR-1 |
6.78 |
1.01 |
|
IR-2 |
6.78 |
1.01 |
|
IR-3 |
7.93 |
1.09 |
|
IR-4 |
8.56 |
1.16 |
|
IR-5 |
9.35 |
1.20 |
|
IR-6 |
10.21 |
1.10 |
|
IR-7 |
11.04 |
1.19 |
|
IR-8 |
11.79 |
1.07 |
|
IR-9 |
12.57 |
0.81 |
|
IR-10 |
14.88 |
0.87 |
*Full-width, Half-maximum
THEMIS IREDR products have the following file names:
annnnnsssEDR.QUB
where:
a = 1-letter description of the type of image collected
I = infrared image
R = infrared reset image
S = infrared shutter image
nnnnn = 5-digit mission orbit when the image was collected
sss = 3-digit image sequence number indicating the order that images were collected each orbit (001 = first image collected in the nnnnn orbit)
In ODE, IREDR products have the following Product IDs:
ANNNNNSSSEDR