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June Wang

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  1. November 25th, 2020 Release 15 of MRO CRISM MTRDR (Map-projected Targeted Reduced Data Record), TER (Targeted Empirical Record), and TRDR (Targeted Reduced Data Record) browse and extras data has been loaded into ODE. This release fills in data from August 9 through November 8, 2008. See https://ode.rsl.wustl.edu/odeholdings/Mars_holdings.html for more information.
  2. November 24th, 2020 - New MEX VMC Data Loaded into ODE - Loaded MEX new VMC EDR & RDR data products released with coverage through June 30th, 2020 (Orbit 20854). See https://ode.rsl.wustl.edu/odeholdings/Mars_holdings.html
  3. November 13, 2020 – MRO HiRISE Updates - MRO HiRISE EDR, RDR, DTM and Anaglyph data products released through October 3, 2020 (Orbit 66499) See https://ode.rsl.wustl.edu/odeholdings/Mars_holdings.html
  4. October 19th, 2020 - SHARAD EDR and RDR data from ASI for MRO Release 54 loaded into ODE, also loaded missing SHARAD RDRs from previous MRO Release 24. - Loaded delayed SHARAD EDRs and RDRs from release 54 (Data coverage: November 10, 2019, through February 8, 2020) - Loaded SHARAD RDR (ASI) missing data from release 24 (Data coverage: June 3 through August 3, 2012)
  5. No-data area will not change the line and sample value of each pixel in the data. So the data will still start from (1,1) for the top-left corner. All you need is just ignore those no-data pixels in your calculation without changing the line and sample values.
  6. One more finding is if using the function of “y = (1 - L0 - Line) * Scale” in line 128 of ‘DSMAP.CAT’ file, y value will always be negative with current label value input, which doesn’t match with the real y value in the data. It looks to me this equation could be changed to “y = ( L0 – Line-1) * Scale”. You can try LINE_PROJECTION_OFFSET = 4476. This value is just my guess, may not be correct. I have contacted with the data provider. I will post the final solution here when I hear anything back from the data provider’s.
  7. Hi Ayushman, Two things here. In your code, you looped around all the pixels. Please don’t include the nodata area in your calculation. The LINE_PROJECTION_OFFSET value in the label doesn’t match with the value of CENTER_LATITUDE. Need to check with the data provider to see what the value used in their processing pipelines. Thanks, June
  8. October 9, 2020 – MRO HiRISE Updates - MRO HiRISE EDR, RDR, DTM and Anaglyph data products released through September 1, 2020 (Orbit 66099) See https://ode.rsl.wustl.edu/odeholdings/Mars_holdings.html
  9. Hi Ayushman, Attached is the screen capture of the LROC RDR (orange color, NAC_ROI_VIKRAM__LOC_P708S0237_5M.TIF) overlain on a WAC mosaic near the South Pole area together with its spatial reference information. The feature matches well. If everything is correct in the book, it looks to me equation 20-15 is a better fit for this case. Have you checked other parameters or steps in your calculation? If you can send me your code and your original value input for the calculation, I can take a further look. Thanks, June
  10. Hi Ayushman, Question 1-> It looks to me C = 2* ARCTAN[P/(2*Rp)] is correct, when compared this with the equation (21-15) in book page 159 of the book “Snyder, J. P. (1987). Map Projections: A Working Manual. U.S. Geological Survey Professional Paper 1395. Washington, DC: United States Government Printing Office.” Please let me know if this is not correct to your test. Question 2-> Please use the value in the attached label. The sentence written in the DSMAP.CAT is more like a general case. Thanks, June
  11. Hi Ayushman, To get the lat&lon for each pixel of the LROC map projected RDRs, please read the ‘DSMAP.CAT’ at https://pds.lroc.asu.edu/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/CATALOG/, which gives the equations and steps on how to convert image array coordinates (Sample, Line) to map coordinates (x, y), and then from map coordinates (x, y) to planetocentric coordinates (Lat, Lon) for different kind of projections. All the parameters needed for the calculation could be find in the attached label of this product. Please let me know if you need more information. Thanks, June
  12. Hi Ayushman, Sorry, these are LROC NAC CDR data products. They are not map projected, but you can still use Arcmap and Gdal to read the data. I confused them with the LROC RDR data in your other post at https://geoweb.rsl.wustl.edu/community/index.php?/topic/2804-details-needed-for-lroc-nac-mosaic-img-file/&tab=comments#comment-4594. I will keep a post there on how to get the lat&lon for each pixel of the LROC map projected RDRs. In the index table under INDEX directory of the LROC CDR volumes, e.g., https://pds.lroc.asu.edu/data/LRO-L-LROC-3-CDR-V1.0/LROLRC_10**/INDEX/, you w
  13. October 6th, 2020 - New MEX OMEGA EDR Data Loaded into ODE - Updated MEX OMEGA EDR data products for extended mission 7 released through December 22nd, 2019 (Orbit 20196). See https://ode.rsl.wustl.edu/odeholdings/Mars_holdings.html
  14. Hi Ayushman, You can use gdal_translate command from gdal tool to translate the img data into a Geotiff, and use this Geotiff in any GIS tools. Arcmap can read the PDS IMG data directly with all its spatial reference information. The version I used here is an old one 10.2.2. Higher version should also work. June
  15. Hi Ayushman, This LROC IMG data has an attached label. You can view the label content with UltraEdit or a Nodepad tool. From the link you gave above, you can also download the Geotiff image from Extra Downloads box. When adding this Geotiff in Arcmap and moving you mouse on the image, you can see the coordinates of each pixel. Because this product is in Polar Stereographic projection, the default coordinates display is in meters. You can change the map setting to view the coordinates in degrees. Since this data including NoData, the red part as shown below, the westernmost longitude is no
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