Odyssey THEMIS VIS Geometric Projection V1 (VGEO1)
VGEO1 – Visible Geometric Projection V1
Instrument: Thermal Emission Imaging System
PDS Data Set ID: ODY-M-THM-5-VISGEO-V1.0 (in data directories odtvg1_****)DOI: 10.17189/1520223
For more information about all THEMIS GEO products, see the Geometric Processing Guide.
The Thermal Emission Imaging System (THEMIS) Visible Geometric Projection V1 (VGEO1) data products spatially registered, spectral image CUBES derived from the THEMIS calibrated radiance products (VISRDRs). The products are completed by projecting the image into standard Mars coordinates, and then applying any additional image processing. Most of the VGEO1 standard products include the application of a cosmetic filter which renders them undesirable for rigorous spectroscopic studies.
THEMIS VIS images are acquired in framelets of size 1024 pixels crosstrack by 192 lines downtrack. The number of framelets is determined by the number of bands selected (five available, enumerated in the table below) and the spatial resolution selected (three summing modes available). If spatial summing is not applied, either a single-band, 19-framelet (65.6 km) image or a 5-band, 3-framelet (10.3 km) image can be collected.
THEMIS available visible bands:
|
Band Numbers |
Center (μm) |
FWHM* (μm) |
|
V-1 |
0.425 |
0.049 |
|
V-2 |
0.540 |
0.051 |
|
V-3 |
0.654 |
0.053 |
|
V-4 |
0.749 |
0.053 |
|
V-5 |
0.860 |
0.045 |
*Full-width, Half-maximum
THEMIS VGEO1 products have the following file names:
VnnnnnsssLOC.CUB (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, VGEO1 products have the following Product IDs:
VNNNNNSSSLOC