Odyssey THEMIS PDS4 VIS Apparent Brightness Record (VISABR4)
VISABR4 – PDS4 Visible Apparent Brightness Record
Instrument: Thermal Emission Imaging System
PDS3 Data Set ID: ODY-M-THM-3-VISABR-V1.0 (in data directories odtvb1_****) DOI: 10.17189/1520297
PDS4 Bundle:urn:nasa:pds:ody.themis.sdpDOI: 10.17189/x0gm-e432
Odyssey THEMIS PDS3 to PDS4 Migration Status: In progress
For more information about THEMIS VISABR4 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) PDS4 Visible Apparent Brightness Record (VISABR4) data products contain the apparent brightness data derived from the calibrated visible observations (VISRDR4s) as one-band IMAGE files. VISABR4s are usually derived from band V-3 (see the table below). If the default band is not available, or significantly corrupt, another band may be used. VISABR4s are not projected into any coordinate system, however they do contain some basic geometric parameters in the attached header. The VISABR4 data values are an 8-bit version of the calibrated radiance, scaled to the minimum and maximum radiance values of each source image.
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 VISABR4 products have the following file names:
VnnnnnsssABR.IMG
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, VISABR4 products have the following Product IDs:
VNNNNNSSSABR