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Originally posted by Imagir
reply to post by Hellas
Could you provide the exact link of the site of these image?
What area of Mars?
Thanks
S&F.
Name:
ppp_oooooo_tttt_ffff_c.IMG
ppp = Mission Phase:
INT = Integration and Testing
CAL = Calibration Observations
ATL = ATLO Observations
KSC = Kennedy Space Center Observations
SVT = Sequence Verification Test
LAU = Launch
CRU = Cruise Observations
APR = Mars Approach Observations
AEB = Aerobraking Phase
TRA = Transition Phase
PSP = Primary Science Orbit (nov 2006-nov 2008)
REL = Relay phase
E01 = 1st Extended Mission Phase if needed
Exx = Additional extended Missions if needed
oooooo = MRO orbit number
tttt = Target code
ffff Filter/CCD designation:
RED0-RED9 - Red filter CCDs
IR10-IR11 – Near-Infrared filter CCDs
BG12-BG13 – Blue-Green filter CCDs
c = Channel number of CCD (0 or 1)
The target code refers to the latitudinal position of the center of the planned observation relative to the start of orbit. The start of orbit is located at the equator on the descending side (night side) of the orbit. A target code of 0000 refers to the start of orbit. The target code increases in value along the orbit track ranging from 0000 to 3595. This convention allows the file name ordering to be time sequential. The first three digits refers to the number of whole degrees from the start of orbit, the fourth digit refers to the fractional degrees rounded to the nearest 0.5 degrees. Values greater than 3595 identify observations as off-Mars or special observations.
Examples of target code:
0000 – planned observation at the equator on descending side of orbit.
0900 – planned observation at the south pole.
1800 – planned observation at the equator on the ascending side (day side) of the orbit.
2700 – planned observation at the north pole.
Originally posted by davesidious
reply to post by Hellas
It might not be post-processing, but actual processing itself. It's not a usual camera on board HiRISE.
As digital artefacts are not uncommon in compressed digital images, it falls on you to show how they are not artefacts before it should be expected anyone else accept your position.
hirise.lpl.arizona.edu...
Creating a DTM is complicated and involves sophisticated software and a lot of time, both computing time and man-hours.
KNOWN ARTIFACTS These are known artifacts present in some, but not all, HiRISE DTMs. They may not be present in this DTM! Look at the terrain shaded relief to detect these before using the DTM!
- Boxes Some DTMs have square areas that are usually about .5-1 m different in elevation from the surrounding areas. These are artifacts of the processing algorithms used in Socet Set ((c) BAE Systems). There may be goups of these boxes. They are almost impossible to edit out, so the user should look for such artifacts in a terrain shaded relief map before using the DTM for analysis.
- CCD seams A HiRISE image is made up of 10 individual images, stitched together along their long edges. In a DTM, these seams can be visible as long lines. These seams are difficult to remove from the whole
- Faceted areas Areas that were very bland (low contrast) or deeply shadowed with low contrast and low signal may have a "faceted" look to them. Terrain in these areas is not trustworthy.