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Susie Slavney

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Everything posted by Susie Slavney

  1. Chase, I have posted an IDL script that demonstrates how to read an SGS data file. It reads as many records as you specify into an IDL array. It also writes a few selected columns of data (not the spectra) to an output text file. You can, of course, change what is written out; this is just an example of how to do it. The output is a csv (comma-separated-value) file that is easily opened in Excel. The download is sgs_read.txt on the Downloads tab of this forum. Rename it to sgs_read.pro to use in IDL. To run this script in IDL, use the command sgs_read, "sgs_01_015_030_00.dat", my_sgs, 72 This will read all 72 records in the data file. The spectra go into the IDL variable my_sgs[*].gamma_spectrum. You can then plot one of them with a command like plot, my_sgs[70].gamma_spectrum Good luck, Susie
  2. Version 1


    IDL script to read Odyssey SGS (summed gamma spectra) binary data tables. Rename to sgs_read.pro.
  3. Chase, I can help you better if you narrow down the problem a bit. Which of the GRS data sets do you want to use? Probably not the EDR (raw) data. The CGS data set has calibrated individual spectra, which are not very useful unless you bin them to improve the signal to noise. The SGS data set has binned data. There are higher level derived products which are tables of various parameters by latitude and longitude. What do you want to do with the data, and what have you already tried that didn't help you? Susie Slavney
  4. Yes, certainly you can open the file, read all or part of it, and do what you like with the data, display it or plot it or whatever. You can write your own program to do this, or use software such as Matlab or IDL. Again, the label tells you everything you need to know to read the data file. Remember this is binary data, so you won't be able to look at it in a text editor. The free program I mentioned before, ImageJ, can create a plot or a list of data values for a selected area of the image, if that is what you want to do.
  5. Sarah, As you didn't mention a particular image data set, I'll just tell you in general how to read PDS images. A typical PDS image is stored as a simple binary array. It is described by a PDS label (a set of ASCII-text keyword=value statements), which can be either attached or detached. An attached label is embedded at the beginning of the image file; a detached label is in a separate file with the same name, extension LBL. The label tells you everything you need to know to read the image -- the number of lines, number of pixels (samples) per line, the size and data type of a sample, and map projection information if the image is a map. (PDS deliberately does not rely on any commercial or proprietary formats to archive image data, in order to ensure the long-term viability of the data.) Commercial image processing software packages such as IDL, ENVI, and ISIS can read PDS images. Some free image processing programs can read PDS images by opening them as a "raw" or "raster" file, if you supply the size and data type as specified in the label. One of these that I have tried recently is ImageJ (http://imagej.nih.gov/ij/). Another I have heard recommended is GDAL (http://www.gdal.org). Finally, there is a free download called NASAView (http://pds.nasa.gov/tools/nasa-view.shtml) that was written specifically for PDS images and tables. It will display a PDS image but doesn't have much in the way of analysis tools. Please let me know if you need more specific information. Susan Slavney
  6. GRS/HEND and GRS/NS data from Release 37 of the Mars Odyssey Mission are now online at the PDS Geosciences Node. These raw and derived data were acquired from January 1 through March 31, 2011.
  7. Data from Release 7 of the Lunar Reconnaissance Orbiter mission are now online. This release includes data acquired between March 15 and June 14, 2011, for most instruments. Direct links to the LRO archives are on the PDS Geosciences Node LRO web page, and tools for searching, displaying and downloading selected data products are available through the Lunar Orbital Data Explorer.
  8. New Mars Express ASPERA (Energetic Neutral Atoms Analyser) data is now available on the PDS Geosciences Node web site. ASPERA ELS raw and derived data now extend through December 31, 2010, and IMA data through June 30, 2005. The primary source for all data from the Mars Express mission is the European Space Agency's Planetary Science Archive. By agreement between ESA and NASA, the PDS hosts copies of Mars Express archives for ease of access in the U.S.
  9. New Mars Odyssey Radio Science data are now available at the PDS Geosciences Node. Data coverage is through Sept. 1, 2011.
  10. New and revised Mars Express MARSIS (Subsurface Sounding Radar Altimeter) data are now available on the PDS Geosciences Node MARSIS web page. All Extended Mission 2 Active Ionospheric Sounder RDR data have been revised (again), and new data have been added. The data set now extends through December 31, 2009. The primary source for all data from the Mars Express mission is the European Space Agency's Planetary Science Archive. By agreement between ESA and NASA, the PDS hosts copies of Mars Express archives for ease of access in the U.S.
  11. EBonacker, Here's the LOLA color map as a cpt file, from the LOLA team. # cpt file created by: makecpt -Cnotmars -T-10/10/1 -Z #COLOR_MODEL = HSV # #-10 330 0.25 0.0625 -9 300 0.12500 0.3750 L -9 300 0.12500 0.250 -8 270 0.625 0.50 -8 270 0.625 0.50 -7 240 0.5000 0.625 L -7 240 0.5000 0.625 -6 225 0.5000 0.6750 -6 225 0.5000 0.6750 -5 215 0.6750 0.8750 L -5 215 0.6750 0.8750 -4 214 0.75 0.78125 -4 214 0.75 0.78125 -3 206 0.517647 0.675 L -3 206 0.517647 0.675 -2 175 0.675 0.75 -2 175 0.675 0.7500 -1 120 0.625 0.625 L -1 120 0.625 0.6250 0 105 0.5 0.4375 0 105 0.5 0.4375 1 90 0.625 0.8125 L 1 90 0.625 0.8125 2 72 0.8750 0.9375 2 72 0.8750 0.9375 3 60 0.750 0.8750 L 3 60 0.750 0.8750 4 48 0.5625 0.6250 4 48 0.5625 0.6250 5 45 0.75 0.8125 L 5 45 0.75 0.8125 6 30 0.8750 0.7500 6 30 0.8750 0.7500 7 12 0.87500 0.8125 L 7 12 0.87500 0.8125 8 8 0.500 0.9375 8 8 0.500 0.9375 9 0 0.12500 0.9375 L 9 0 0.12500 0.9375 10 345 0.0000 1.0000 U B 0 0 0 F 0 0 1 N 57.3529 0.382022 0.698039 For using cpt files with Matlab, I found the following on the Matlab Central web site: http://www.mathworks.com/matlabcentral/fileexchange/28943-color-palette-tables-cpt-for-matlab Hope this helps you. Susie Slavney
  12. No, the color scale is not in the archive. I'll ask the LOLA team to provide something.
  13. MESSENGER Release 6 data are now online. After more than six years, one Earth flyby, two Venus flybys, and three Mercury flybys, MESSENGER entered Mercury's orbit in March 2011. This release includes the first two months' worth of orbital data. MESSENGER instruments include the Gamma Ray and Neutron Spectrometers, X-Ray Spectrometer, Laser Altimeter, the Mercury Atmospheric and Surface Composition Spectrometer (UV, visible, and IR spectra), the Magnetometer, the Energetic Particle and Plasma Spectrometer, the Mercury Dual Imaging System (wide angle and narrow angle cameras for imaging the surface), the Radio Science experiment, and SPICE kernels. See the PDS Geosciences Node MESSENGER web page for links to these data sets.
  14. New Mars Reconnaissance Orbiter data from the CRISM, SHARAD, and Radio Science experiments are now online at the PDS Geosciences Node. This release covers the data acquisition period November 9, 2010, through February 8, 2011. There are no CRISM or SHARAD products after January 15 due to solar conjunction.
  15. The Mars Exploration Rover release 29 includes data from the Opportunity rover for sols 2431-2520, available from the PDS Geosciences Node. With this release the MER Analyst's Notebook now has available a new Mosaic Viewer Tool for viewing MER traverse maps and image mosaics. The current version is supported on Windows and Mac/OS platforms.
  16. The Mars Reconnaissance Orbiter CRISM Team has completed a revision of all previously released TRDR data products. These products have been reprocessed using version 3 of the CRISM processing software. Compared to version 2 TRDRs, these products have had most artifacts corrected and noise reduced by use of a sophisticated filtering process. The version 3 products are now online at the PDS Geosciences Node CRISM page, http://pds-geosciences.wustl.edu/missions/mro/crism.htm. The previously released TRDR version 2 products will remain available until Dec. 31, 2011.
  17. A new Earth-based Lunar Radar map has been released on the PDS Geosciences Node web site at http://pds-geosciences.wustl.edu/missions/sband/index.htm. This data set contains dual-polarization backscatter maps of the lunar nearside collected at a wavelength of 12.6 cm (S-band), using the 305 m Radio Telescope at Arecibo to transmit and the NRAO's 105 m Robert C. Byrd Green Bank Telescope to receive. The data were provided by Bruce Campbell of the Smithsonian Institution's Center for Earth and Planetary Studies and archived by the PDS Geosciences Node.
  18. New data from the Mars Express HRSC and Radio Science experiments have been posted on the PDS Geosciences Node web site.
  19. The second release of Lunar Reconnaissance Orbiter Radio Science data is now online at the PDS Geosciences Node, at http://pds-geosciences.wustl.edu/missions/lro/rss.htm. This release completely replaces all previously released Radio Science data except for the SPICE kernels. It covers the time from the beginning of the LRO mission through February 1, 2011.
  20. Edwin, would you please tell me the file names of the products you're using, so that we can try to duplicate the problem here? Thanks.
  21. Release 36 of Mars Odyssey data covers the period October 1 - December 31, 2010. The gamma sensor in the GRS suite is no longer operating, so no raw gamma products (raw EDRs or derived CGS and SGS) are included with the release. The Neutron Spectrometer and HEND components are operating as usual. Data are available on the Geosciences Node web page for Odyssey GRS.
  22. Lunar Reconnaissance Orbiter (LRO) Release 6 includes data from these instruments: CRATER, Diviner, LAMP, LEND, LOLA, LROC, and Mini-RF, covering the nominal acquisition period December 15, 2010, through March 14, 2011. For links to these data sets at the PDS Geosciences Node and at other PDS nodes, visit the LRO page of the Geosciences Node web site.
  23. New data have been added to the Mars Express HRSC DTM archive, bringing the coverage to February 13, 2008, orbit 5289. The data are available on the PDS Geosciences Node web site, on the HRSC page.
  24. New data have been added to the Mars Express Radio Science Raw Extended Mission 2 data set, extending the coverage to March 29, 2009. The data are available on the PDS Geosciences Node web site.
  25. New data from the Mars Reconnaissance Orbiter CRISM, SHARAD, and Radio Science experiments is now available on the PDS Geosciences Node web site. This is MRO Release 17, covering the data acquisition period August 9 - November 8, 2010.
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