DATA_SET_DESCRIPTION |
Data Set Overview
=================
The roughness map contains surface roughness estimates at each pixel
in an XYZ image. The roughness is computed as the maximum
peak-to-peak deviation from the local plane. Units are meters; that
is, a pixel value of 0.05 means that the local surface about that
pixel has a maximum peak-to-peak deviation along the surface normal
by 0.05m (5cm). Roughness values above some useful threshold
(maximum roughness) are clipped to that threshold. If a roughness
could not be computed for a pixel (e.g. because of lack of range
data, or too much noise in the range data), then the roughness value
at that pixel will be set to the bad roughness value (which must
be greater than maximum roughness).
Processing
==========
MER Camera Payload RDRs are considered Level 3 (Calibrated Data
equivalent to NASA Level 1-A), Level 4 (Resampled Data
equivalent to NASA Level 1-B), or Level 5 (Derived Data
equivalent to NASA Level 1-C, 2 or 3). The RDRs are to be
reconstructed from Level 2 edited data, and are to be assembled
into complete images that may include radiometric and/or geometric
correction.
MER Camera Payload EDRs and RDRs will be generated by JPL's
Multimission Image Processing Laboratory (MIPL) under the OPGS
subsystem of the MER GDS. RDRs will also be generated by the Athena
Pancam Science and Microscopic Imager Science Teams under the SOAS
subsystem of the GDS.
RDR data products will be generated by, but not limited to, MIPL
using the Mars Suite of VICAR image processing software at JPL, the
Athena Pancam Science Team using IDL software at Cornell University
and JPL, and the Microscopic Imager Science Team using ISIS software
at USGS (Flagstaff) and JPL. The RDRs produced will be processed
data. The input will be one or more Camera EDR or RDR data products
and the output will be formatted according to this SIS. Additional
meta-data may be added by the software to the PDS label.
Data
====
RDR products generated by MIPL will have a VICAR label wrapped by a
PDS label, and their structure can include the optional EOL label
after the binary data. RDR products not generated by MIPL may
contain only a PDS label. Or, RDR products conforming to a standard
other than PDS, such as JPEG compressed or certain Terrain products,
are acceptable without a PDS header during mission operations, but
may not be archivable.
The RDR data product is comprised of radiometrically decalibrated
and/or camera model corrected and/or geometrically altered versions
of the raw camera data, in both single and multi-frame (mosaic)
form. Most RDR data products will have PDS labels, or if generated
by MIPL (OPGS), dual PDS/VICAR labels. Non-labeled RDRs include JPEG
compressed products and the Terrain products.
Software
========
The MIPL Mars Program Suite was used to generate these RDRs.
Media/Format
============
The data set will initially be delivered and kept online. Upon
Mission completion, the Panoromic Camera Operations RDRs will be
delivered to PDS on DVD.
|