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# Lunar Reconnaissance Orbiter
LRO interactive interface: http://wms.lroc.asu.edu/lroc
* LRO data products: https://lunar.gsfc.nasa.gov/dataproducts.html
* PDS node: https://pds-geosciences.wustl.edu/missions/lro/default.htm
......@@ -40,3 +42,9 @@ A new lunar DEM: https://www.sciencedirect.com/science/article/pii/S001910351500
* Software: https://pds-geosciences.wustl.edu/missions/lro/lola_software.htm
## Extra info
* DTM processing: https://github.com/nasa/DERT/wiki/LRO-LOLA-and-LROC-Example
......@@ -13,28 +13,114 @@ distance from the spacecraft to Mars surface through an infrared laser.
MOLA provides precise data for topographic maps; MOLA is also a passive
radiometer, collecting radiance of the surface (at 1064nm).
From https://pds-geosciences.wustl.edu/mgs/mgs-m-mola-3-pedr-l1a-v1/mgsl_21xx/catalog/pedrds.cat:
## MEGDR
> A Precision Experiment Data Record (PEDR) contains MOLA science mode
telemetry data that has been converted to engineering and physical
units. The Aggregated Experiment Data Record (AEDR) is the source for
the science data, while ancillary information is provided by the Radio
Science investigation. Precision orbit, geometric, and calibration data
have been incorporated, as well as an equipotential datum (areoid), so
that topographic profiles may be obtained directly from the PEDR.
* https://pds-geosciences.wustl.edu/missions/mgs/megdr.html
* https://pds.nasa.gov/ds-view/pds/viewDataset.jsp?dsid=MGS-M-MOLA-5-MEGDR-L3-V1.0
From https://pds-geosciences.wustl.edu/mgs/mgs-m-mola-5-megdr-l3-v1/mgsl_300x/catalog/megdrds.cat:
## PEDR
* https://pds-geosciences.wustl.edu/missions/mgs/pedr.html
> The MOLA Experiment Gridded Data Record (EGDR) is a topographic map
> of Mars based on altimetry data acquired by the MOLA instrument and
> accumulated over the course of the mission. Two types of EGDR
> products are produced: the Initial Experiment Gridded Data Record
> (IEGDR), consisting of data accumulated through at least the first
> 30 days of the mapping mission, and the Mission Experiment Gridded
> Data Record (MEGDR), consisting of data accumulated over the whole
> primary mission. Different resolutions of the IEGDR and MEGDR may be
> released, and multiple versions of each product may be released.
## Data set description
Reference: https://pds-geosciences.wustl.edu/mgs/mgs-m-mola-5-megdr-l3-v1/mgsl_300x/aareadme.txt.
### Data content
> The MEGDR products in this data set are images gridded at several
> resolutions: 4, 16, 32, 64, and 128 pixels per degree. These images
> provide maps of the global topography of Mars. In addition, maps with
> resolutions of 128, 256 and 512 pixels per degree are included for the
> north and south polar regions of Mars. For each map resolution, the
> data set contains images of planetary radius, topography, and the
> number of MOLA shots within a grid cell (referred to as counts).
> Topography is computed as the planetary radius minus the areiod
> raduis. Images of the Mars areoid are provided at resolutions of 4,
> 16, and 32 pixels per degree.
### Projection
> The global maps are in simple cylindrical map projections using the
> IAU2000 planetocentric coordinate system with east positive longitude.
> The polar maps are stored in polar stereographic projections.
### Data structure
> Simple cylindrical maps with resolutions of 4, 16, and 32 pixels per
> degree are stored in a single file. Maps with higher resolutions are
> divided into tiles. The 64 pixel per degree maps are divided into 4
> separate images, with each image covering 90 degrees of latitude and
> 180 degrees of longitude. The 128 pixel per degree maps cover the
> latitude range of 88 degrees north to 88 degrees south and are divided
> into 16 separate tiles with each tile containing 44 degrees of
> latitude and 90 degrees of longitude. Each polar stereographic map is
> stored in a single file.
#### Naming convention
> The MEGDR data files are stored in directories based on the resolution
> of the maps. There is one directory for each map resolution within
> the data set. Data directory names for the global maps have the form
> MEGxxx, where the xxx refers to the map resolution in pixels per
> degree, including leading zeros. For example, the directory MEG016
> contains all the 16 pixel per degree maps. The polar maps are stored
> in a directory named POLAR.
>
> File names for the global image maps use the format of
> MEGpxxnyyyrv.IMG with the following definitions:
>
> * `p` indicates the product type (A for areoid, C for counts, R for radius, and T for topogray)
> * `xx` is the latitude of the upper left corner of the image
> * `n` indicates whether the latitude is north (N) or south (S)
> * `yyy` is the east longitude of the upper left corner of the image
> * `r` is the map resolution using the pattern
> `c` = 4 pixel per degree
> `e` = 16 pixel per degree
> `f` = 32 pixel per degree
> `g` = 64 pixel per degree
> `h` = 128 pixel per degree
> `i` = 256 pixel per degree
> `j` = 512 pixel per degree
> (This convention is consistent with that used for the Mars Digital Image Model [MDIM] archives.)
> `v` is a letter indicating the product version.
>
> The file naming scheme used for the polar maps is MEGT_p_rrr_v.IMG,
> in which p is replaced by N for north pole or S for south pole, rrr
> is replaced by 128, 256 or 512, and v is the product version.
## MEGDR
* https://pds-geosciences.wustl.edu/missions/mgs/megdr.html
**Note**:
> About reading MEGDR data, there is a document (`mola_envi`) explaining
> adjustments to the coordinates when using ENVI/ArcGIS:
>
> * https://pds-geosciences.wustl.edu/mgs/mgs-m-mola-5-megdr-l3-v1/mgsl_300x/extras/mola_envi.htm
> Basically, ENVI and ArcGIS don't read map projection information from MEGDR
> labels causing a misalignment to other data sets (e.g., HSRC).
## PEDR
* https://pds-geosciences.wustl.edu/missions/mgs/pedr.html
* https://pds.nasa.gov/ds-view/pds/viewDataset.jsp?dsid=MGS-M-MOLA-5-PEDR-SAMPLER-V1.0
From https://pds-geosciences.wustl.edu/mgs/mgs-m-mola-3-pedr-l1a-v1/mgsl_21xx/catalog/pedrds.cat:
> A Precision Experiment Data Record (PEDR) contains MOLA science mode
> telemetry data that has been converted to engineering and physical
> units. The Aggregated Experiment Data Record (AEDR) is the source for
> the science data, while ancillary information is provided by the Radio
> Science investigation. Precision orbit, geometric, and calibration data
> have been incorporated, as well as an equipotential datum (areoid), so
> that topographic profiles may be obtained directly from the PEDR.
......@@ -11,9 +11,19 @@ Data sets of interest:
* https://pds-geosciences.wustl.edu/mro/mro-m-crism-5-rdr-multispectral-v1/mrocr_3002
* https://pds-geosciences.wustl.edu/mro/mro-m-crism-5-rdr-multispectral-v1/mrocr_3101
* https://pds-geosciences.wustl.edu/mro/mro-m-crism-5-rdr-multispectral-v1/mrocr_3102
* TRDR: Targeted Reduced Data Records, calibrated data in non-resampled sensor space,
* https://pds-geosciences.wustl.edu/mro/mro-m-crism-3-rdr-targeted-v1/
![CRISM_datasets](CRISM_datasets.png)
![CRISM_dataset_IDs](CRISM_dataset_IDs.png)
Other data sets provided by CRISM but **not** of our interest are listed in the [Appendix](#CRISM-data-sets).
### MTRDR
Or simply MTR data, available at https://pds-geosciences.wustl.edu/mro/mro-m-crism-5-rdr-mptargeted-v1/mrocr_4001/. Directory `mtrdr` stores _science-data_, `browse` provides high-level data for quick exploration, and `index` provides the index (with information about the respective locations, for example) of all observations/products.
......
# Context Camera
* https://pds-imaging.jpl.nasa.gov/portal/mro_mission.html
* https://pds.nasa.gov/ds-view/pds/viewDataset.jsp?dsid=MRO-M-CTX-2-EDR-L0-V1.0
* http://www.msss.com/all_projects/mro-ctx.php
> The Mars Reconnaissance Orbiter (MRO) Context Camera (CTX) is designed to acquire images of the martian surface with a spatial resolution of 6 meters (~20 ft) per pixel over a swath about 30 kilometers (18.6 mi) wide.
> To obtain images that provide context for the very high spatial resolution pictures to be obtained by the MRO High Resolution Imaging Science Experiment (HiRISE) and the high spectral resolution MRO Compact Reconnaissance Imaging Spectrometer for Mars (CRISM).
> To obtain images that provide context for the very high spatial resolution pictures to be obtained by the MRO High Resolution Imaging Science Experiment (HiRISE) and the high spectral resolution MRO Compact Reconnaissance Imaging Spectrometer for Mars (CRISM).
* EDR products specification: [ctxsis.pdf](ctxsis.pdf): the content of this document is a subset of [archsis.pdf](archsis.pdf) with information about CTX only (`archsis` talks about MARCI as well). One information very important from this document is:
> Each CTX Standard Data Product is a single image in the raw image format as produced by the instrument. The data have been depacketized, decompressed, and reformatted with standard labels, but are otherwise unprocessed. In that sense these products are most closely analogous to the Experiment Data Record (EDR) products of previous missions. The processing level of this dataset is CODMAC level 2 (NASA level 0).
That inform us what kind of data we will find in MRO/CTX archive.
* Data archive specification: [archsis.pdf](archsis.pdf)
## Data Archive
* https://pds-imaging.jpl.nasa.gov/data/mro/ctx/
* EDR products specification: [ctxsis.pdf]
* Data archive specification: [archsis.pdf]
......@@ -10,27 +10,39 @@
* [EDR](HiRISE_EDR_SIS_v1-1-2.pdf)
Quote introduction:
> EDR products are the permanent record of the imaging acquired by the HiRISE
> instrument and successfully transmitted back to Earth. An EDR contains raw image
> data, observational-related engineering data, and information about the instrument
> commanding parameters used to acquire the image. The EDR products are used by
> the HiRISE team to create derived products that are radiometrically calibrated and
> geometrically processed to create map products associating a pixel to a latitude
> and longitude coordinate on the Mars surface.
> and longitude coordinate on the Mars surface.
* [RDR](HiRISE_RDR_SIS_v1-2.pdf)
Quote introduction:
> RDR products are radiometrically-corrected images resampled to a standard
> map projection. (...) A RDR image is stored in the JPEG2000 (...) format recently
> adopted by the PDS. The (JP2) images are accompanied by a PDS detached label
> providing supporting information about the observation. There will typically be
> providing supporting information about the observation. **There will typically be
> two RDR standard products per HiRISE observation a single-color RDR product
> built from the operating red-filter CCDs, and a three-color RDR product if the
> blue-green and near-infrared CCDs were additionally operating.
> blue-green and near-infrared CCDs were additionally operating.**
>
> The HiRISE RDR products have detached PDS labels. The primary object
> within the RDR file is the IMAGE object containing the observation
> image that has been radiometrically corrected and geometrically
> resampled to a standard map projection. The image is organized
> according to the JPEG2000 JP2 file format standard.
## PDS data set volumes
## Data archive
* https://pds-imaging.jpl.nasa.gov/volumes/mro.html
* https://hirise-pds.lpl.arizona.edu/PDS/
> The [errata.txt]( https://hirise-pds.lpl.arizona.edu/PDS/ERRATA.TXT) file from the archive has important information about data in `extras/`.
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