PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM ^TEXT = "AAREADME.TXT" OBJECT = TEXT PUBLICATION_DATE = 2018-12-07 NOTE = "AAREADME.TXT describes this volume." END_OBJECT = TEXT END Volume DWNCLSPG_2 Dawn FC2 Ceres LAMO Regional Digital Terrain Model (DTM) SPG Data Set DAWN-A-FC2-5-CERESLAMODTMSPG-V1.0 ============================================================================== Brief Disk Description ============================================================================== This volume contains a Ceres local digital terrain model (DTM) of the Occator regions based on the Dawn Low Altitude Mapping orbit (LAMO) Framing Camera 2 (FC2) images and derived by using the stereo photogrammetry (SPG) method. Only part of Ceres was imaged with enough different viewing geometries to apply the SPG technique in order to compute a DTM. Occator is one region where there are sufficient data to produce a high resolution regional DTM. 550 LAMO stereo images with a resolution of ~ 35 m/pixel were processed to generate a high-resolution digital terrain model (DTM). The DTM image scale is 256 pixel per degree (~32. m/pixel) grid space. 1.8 billion surface points (~15 points per DTM grid) yield a calculated mean intersection error of +/- 2.8 m resulting in ~1.5 m height accuracy. A list of the raw FC2 images (CERES-CON-LA2C2E-IMAGE-LIST.TXT) used to produce this DTM has been included in the DOCUMENT directory of this archive volume. NOTE: Reading the Science Plan (DOCUMENTS/SCIENCE_PLAN/DAWN_SCIPLAN_V5_4.PDF) is critical to the understanding of the planned Ceres observations and science objectives. The calibration procedure and files are identical to those applied to the Vesta and Ceres HAMO data. There are several key publications that describe the data processing and image mosaicking. These include: JAUMANNETAL2017 Jaumann, R., F. Preusker, K. Krohn, I. von der Gathen, K. Stephan, and 17 others, 2017. Topography and Geomorphology of the Interior of Occator Crater on Ceres, 48th Lunar and Planetary Science Conference, March 2017. PREUSKERETAL2016 Preusker,F.,Scholten,F.,Matz,K.-D.,Elgner,S.,Jaumann,R.,Roatsch,T., Joy,S.P.,Polanskey,C.A.,Raymond,C.A.,Russell,C.T.,2016.Dawn at Ceres - Shape model and rotational state, 47th Lunar and Planetary Science Conference (LPSC) - USRA-Houston, 2016 , Abstract 1954. http://www.hou.usra.edu/meetings/lpsc2016/pdf/1954.pdf ROATSCHETAL2016 Roatsch,T., E. Kersten,K.-D. Matz,F. Preusker, F. Scholten, R. Jaumann,C.A. Raymond, C.T.Russell, High-resolution Ceres High Altitude Mapping Orbit Atlas derived from Dawn Framing Camera images, Planetary and Space Sciences, in press, 2016. PREUSKERETAL2012 Preusker, F., J. Oberst, J. Head, T. Watters, M. Robinson, M. Zuber, S. Solomon, Stereo topographic models of Mercury after three MESSENGER flybys. Planet. Space Sci. (2011). DOI:10.1016/j.pss.2011.07.005 RAYMONDETAL2012 Raymond, C.A., R. Jaumann, A. Nathues, H. Sierks, T. Roatsch, F. Preusker, F. Scholten, R.W. Gaskell, L. Jorda, H.-U. Keller, M.T. Zuber, D.E. Smith, N. Mastrodemos, and S. Mottola, The Dawn topography investigation. Space Sci. Rev. 163, 487 (2011). DOI: 10.1007/s11214-011-9863-z /DOCUMENT/STEREO_PHOTOGRAMMETRY.PDF (this volume) POLANSKEYETAL2016 Polanskey, C., S. Joy, and C. Raymond, "Dawn Ceres Mission: Science Operations Performance", SpaceOps 2016 Conference, SpaceOps Conferences, (in press). All data are stored in the 'DATA' branch of the directory tree. In addition to the data files, ancillary information is stored in an attached PDS label. Additional copies of the data in TIFF (Tagged Image File Format)format can be found in the EXTRAS directory of this volume. Some users may find this format easier to work with in some software packages such as ArcGIS. Users of these data are encouraged to acknowledge both the PDS and the principal investigators of the instruments whose data is used in analysis in all publications. ============================================================================== File Naming Conventions ============================================================================== Data and browse images on this volume conform to the following naming convention: CE_PHASE_T_LAT_LONG_PROJ_TYPE.EXT where: CE_LAMO_L is literal for Ceres LAMO Local LAT is the center latitude of the image LONG is the center longitude of the image PROJ is the map projection type (EQU = equidistant cylindrical) DTM is literal, the image type is DTM, example: CE_LAMO_L_OCCATOR_EQU_DTM.IMG Ceres LAMO Occator regional using an equidistant cyclindrical projection for the DTM. ============================================================================== Volume Set Information ============================================================================== This volume is part of the FC2 high level data volume set. This volume set includes the following volumes: Volume ID Description ------------------------------------------------------------ DWNVFC2_2 Dawn FC2 L2/3 Vesta Encounter mosaics DWNVSPG_2 Dawn FC2 L2/L3 Vesta stereo-photogrammetric DTM DWNVSPC_2 Dawn FC2 L2/L3 Vesta stereo-photoclinometric DTM DWNCHCFC2_2 Dawn FC2 L2/3 Ceres HAMO clear mosaics DWNCHFFC2_2 Dawn FC2 L2/3 Ceres HAMO color filter mosaics DWNCLCFC2_2 Dawn FC2 L2/3 Ceres LAMO clear mosaics DWNCHSPG_2 Dawn FC2 L2/L3 Ceres HAMO stereo-photogrammetric DTM DWNCHSPC_2 Dawn FC2 L2/L3 Ceres HAMO stereo-photoclinometric DTM DWNCLSPG_2 Dawn FC2 L2/L3 Ceres LAMO stereo-photogrammetric DTM DWNCLSPC_2 Dawn FC2 L2/L3 Ceres LAMO stereo-photoclinometric DTM ============================================================================== Mission Facts ============================================================================== The 'Dawn Ceres Science Phases' table below provides a list Dawn Ceres Encounter mission phase start dates. ------------------------------------------------------------------------------ Dawn Ceres Science Phases ------------------------------------------------------------------------------ start date (DOY) Phase Name (ID) ------------------------------------------------------------------------------ 2014-12-26 (360) CERES SCIENCE APPROACH (CSA) 2015-04-24 (114) CERES SCIENCE ROTATIONAL CHARACTERIZATION 3 (CSR) 2015-05-09 (129) CERES TRANSFER TO SURVEY (CTS) 2015-06-04 (155) CERES SCIENCE SURVEY (CSS) 2015-07-01 (182) CERES TRANSFER TO HAMO (CTH) 2015-08-17 (228) CERES SCIENCE HAMO (CSH) 2015-10-23 (296) CERES TRANSFER TO LAMO (CTL) 2015-12-16 (350) CERES SCIENCE LAMO (CSL) 2016-06-19 (171) End of prime mission 2016-06-19 (171) CERES EXTENDED LAMO (CXL) = XMO1 2016-09-02 (246) CERES TRANSFER TO JULING (CTJ) 2016-10-10 (284) CERES EXTENDED JULING (CXJ) = XMO2 2016-11-03 (308) CERES TRANSFER TO GRAND (CTG) 2016-12-14 (349) CERES EXTENDED GRAND (CXG) = XMO3 2017-02-23 (054) CERES TRANSFER TO OPPOSITION (CTO) 2017-04-28 (118) CERES EXTENDED OPPOSITION (CXO) = XMO4 2017-07-01 (182) End of extended mission ============================================================================== File Formats ============================================================================== The data files on this volume are formatted as PDS images (.IMG, binary) with attached PDS3 labels. The PDS label contains information describing spacecraft, target, and data record format. Even though the PDS labels are attached to the files, they can be viewed in a text editor. A data set description, instrument description, and other PDS documents are in .CAT files in the /CATALOG directory. Additional documentation is generally located in the DOCUMENT directory. Note for Windows users: In more recent versions of the Microsoft Windows operating system the .CAT by default is reserved as 'Security Catalog.' The .CAT files contained in this volume are ASCII text files, and can be read by any form of text editor. To make Windows open files with this name extension as text files, do the following. To make Windows open files with this name extension as text files right click the .CAT file, select with and choose a text editor to open the file. ============================================================================== Errata ============================================================================== Every effort has been made to insure that the data and documentation are of the best possible quality. However, mistakes are inevitable. There is a file called ERRATA.TXT found at the root level of this volume which contains a list of known deficiencies or caveats associated with data on this volume at the time this volume was produced. ============================================================================== Volume Contents and Structure ============================================================================== This section describes the volume structure and naming conventions. Below is a tree diagram of the volume, followed by a description of the directory function and key files in each directory. DWNCLSPG_2 (root directory) | |- AAREADME.TXT Describes volume contents, and organization (this file) | |- ERRATA.TXT Describes known deficiencies or caveats in the data or | on this volume. | |- VOLDESC.CAT High level description of volume contents. | |- [BROWSE] Contains a JPG images of the data located in the DATA branch | of this volume. More information on the contents of this | directory is provided in the file /BROWSE/BROWINFO.TXT. | |- [CATALOG] PDS catalog files containing information describing the | data, instrument, instrument personnel, relevant references, | the spacecraft, and mission. More information on the contents | of this directory is provided in the file | /CATALOG/CATINFO.TXT. | |- [DATA] Contains the data files. | |- [DOCUMENT] Contains documents describing the instrument, and data | acquisition, processing, and usage. More information on the | contents of this directory is provided in the file | /DOCUMENT/DOCINFO.TXT. | |- [EXTRAS] Contains files which facilitate the use of the data on the | disk, but which are not actually required for the use or | understanding of those data. A more detailed description of | the contents of this directory is provided in the file | /EXTRAS/EXTRINFO.TXT. | |- [GEOMETRY] Contains a SPICE planetary contants kernel (PCK) that is | consistent with the DTM model being archived. | |- [INDEX] Contains a table of contents for all files located on this | volume, and the volume set to date. A more detailed | description of the contents of this directory is provided in | the file /INDEX/INDXINFO.TXT. ============================================================================ Contacts ============================================================================ This volume was produced for the Planetary Data System (PDS) at the Small Bodies node. The data, and associated metadata were supplied by Dr. Thomas Roatsch, DLR Berlin-Adlershof. The volume was assembled at the Dawn Science Center (DSC), by Joseph N. Mafi. For questions or problems regarding the volume, please contact Carol Neese at the PDS Small Bodies Node: Email neese@psi.edu Telephone 520-622-6300 Mail Carol Neese Planetary Science Institute 1700 E. Ft. Lowell, Ste. 106 Tuscon, AZ 85719-2395 USA For question regarding the data, please contact Dr. Thomas Roatsch of DLR: Email thomas.roatsch@dlr.de Telephone +49 30 67055-0 Mail DLR Berlin-Adlershof RutherfordstraBe 2 12489 Berlin Germany For questions regarding PDS Standards or other archives available from the PDS, please contact PDS Operator at the PDS Engineering Node (at JPL): Email pds_operator@jpl.nasa.gov Telephone 818-354-4321 Mail Planetary Data System, PDS Operator Jet Propulsion Laboratory Mail Stop 202-101 4800 Oak Grove Dr. Pasadena, CA 91109-8099 USA The PDS assumes no legal liability for errors on this disk. All users are encouraged to verify the correctness of the data prior to submitting any publications or other work based on these data. Please report errors on this disk to the Small Bodies Node of the PDS through the ERRATA reporting procedures described above.