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If Obama had some stuff, it would look like that.
Calibration and Measured Parameters
===================================
The radiometric calibration-correction procedure is described here
at a high level. A detailed description will be provided in a
future HiRISE calibration paper. The radiometric calibration
correction is performed on each individual HiRISE channel file
(EDR) correcting for instrument offset, dark current, gain, then
converting to I/F reflectance.
The first step in the calibration, carried out by the ISIS
(Integrated Software for Imagers and Spectrometers,
http:/isis.astrogeology.usgs.gov/hical) hiclean program, corrects
for instrument dark current and offset. The hiclean program uses
the ancillary calibration data (dark and mask pixels) that
accompany the science data to compute corrections in both the
column (sample) and row (line) directions. The mask pixels,
positioned at the start of the instrument output, provide dark
current information for each column. The dark pixels, positioned
at the end of each image row, capture the time dependent dark
current and offset instrument drift.
The ISIS program then applies an intra-channel B0 (additive dark
current matrix) and A0 (multiplicative gain matrix) correction for
each column in the image array. The hical then converts the pixel
values to I/F (intensity/flux, I/F = 1 for a 100% ideal lambertian
reflector viewed normal to the surface) as described below:
For:
H = dark current and offset corrected image, output of hiclean
B0 = intra-channel dark current correction (TDI & BIN dependent)
A0 = intra-channel gain correction (TDI and BIN dependent)
G = global gain correction, normalizes CCD/channels
L = observation line time
I = I/F conversion factor at Sun-Target distance of 1.5 AU
AU = Mars-to-Sun distance (AU) at time of observation
Z = radiometrically corrected image in I/F units
Originally posted by paperface
I do not buy the sand dune fantasy that is being explained.
These are living entities that change shape and sometimes become invisible.Various Mars oddity sites have showed images similar to these Land scrumpers as they have been nicknamed.
Nobody is trying to sell it.
Originally posted by paperface
I do not buy the sand dune fantasy that is being explained.
Dunes act like living entities, moving and changing shape, but not by much.
These are living entities that change shape and sometimes become invisible.
Once more, could you provide some examples?
Various Mars oddity sites have showed images similar to these Land scrumpers as they have been nicknamed.