Odyssey THEMIS IR Geometric Projection V1 (IRGEO1)
IRGEO1 – Infrared Geometric Projection V1
Instrument: Thermal Emission Imaging System
PDS Data Set ID: ODY-M-THM-5-IRGEO-V1.0 (in data directories odtig1_****)DOI: 10.17189/1520311
For more information about all THEMIS GEO products, see the Geometric Processing Guide.
The Thermal Emission Imaging System (THEMIS) Infrared Geometric Projection V1 (IRGEO1) data products are spatially registered, spectral image CUBEs derived from the THEMIS calibrated radiance products (IRRDRs). Because the products contain geometrically registered and atmospherically corrected calibrated radiance, IRGEO1 products are ideal for use in surface studies and for use with other projected Mars datasets.
All IRGEO1 products are sinusoidally projected. The sinusoidal projection (SNU) is an equal area, partially equidistant projection where latitude lines are drawn as parallel lines, the center meridian is a straight, vertical line, and the remaining longitude lines curve with increasing distance away from the center.
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.
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 IRGEO1 products have the following file names:
InnnnnsssSNU.CBU.gz (with detached PDS label)
where:
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, IRGEO1 products have the following Product IDs:
INNNNNSSSSNU