Viking VISAB Digital Terrain Models (DTM)
DTM – Digital Terrain Models
Instrument: Visual Imaging Subsystem Cameras A and B
PDS Data Set ID: VO1/VO2-M-VIS-5-DTM-V1.0DOI: 10.17189/1520376
For more information about VISAB DTM products, see the Data Set Catalog File.
The Visual Imaging Subsystem Cameras A and B (VISAB) Digital Terrain Models (DTMs) are rasters of topographic data created by special geodetic and photogrammetric processing. The format is similar to that of the Digital Image Models (MDIMs), except that elevation values are used in the array instead of image brightness values. DTMs have resolutions of 1/64 deg/pixel (943m), 1/16 deg/pixel (3.69km), and 1/4 deg/pixel.
VISAB DTM products have the following file names:
Twaadooo.IMG
where:
w = resolution code for image file (in degree/pixel)
C = 1/4
E = 1/16
G = 1/64
aa = central latitude value rounded down to nearest whole latitude
d = latitude direction
N = North latitude
S = South latitude
ooo = central longitude value rounded down to nearest whole longitude
In ODE, DTM products have the following Product IDs:
TWAADOOO.IMG