PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2014-12-01, P. Garcia prepared" RECORD_TYPE = STREAM OBJECT = DATA_SET DATA_SET_ID = "MESS-H-MDIS-5-DEM-ELEVATION-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "MESSENGER MERCURY MDIS LEVEL 5 DEM V1.0" DATA_SET_TERSE_DESC = "Digital Elevation Model data for the MDIS camera system on MESSENGER." DATA_SET_COLLECTION_MEMBER_FLG = "N" DATA_OBJECT_TYPE = "IMAGE" START_TIME = "UNK" STOP_TIME = "UNK" DATA_SET_RELEASE_DATE = 2015-03-06 PRODUCER_FULL_NAME = "KRIS BECKER" DETAILED_CATALOG_FLAG = "N" CITATION_DESC = "K. Becker, M. Robinson, F. Pruesker, R. Gaskell, MESSENGER MDIS DEM V1.0, NASA Planetary Data System, 2015" ABSTRACT_DESC = " Abstract ======== The MESSENGER MDIS DEMs are derived products. A DEM is a gridded (raster) product that records elevation values of a given terrain in each pixel. Corresponding metadata include map projection information so pixels can be associated with latitude and longitude. Values are measured relative to the planetary geoid reference radius of 2440 km (i.e. elevation). Generally, the MESSENGER DEM products described here are derived from MESSENGER MDIS image data. The DEMs are typically derived using stereo photogrammetry (i.e., stereo pairs or sets) or stereo photoclinometry (i.e., shape from shading) techniques. The primary PDS product is a DEM provided in both PDS image (.IMG) and JPEG 2000 (.JP2) format files. Associated with each DEM product is the list of lower-level MDIS products (specified by their SOURCE_PRODUCT_IDs) used to create that DEM." DATA_SET_DESC = " Data Set Overview ================= The data set consists of digital elevation models (DEM) of Mercury produced by several institutions participating in the MESSENGER mission. Each DEM data producer applies different techniques to derive their products. The SIS describes each technique in detail. The data set contains several global DEM products and some specially selected regional DEM products. Each product are gridded map projections of various resolutions and provided in PDS compliant IMG format.These gridded map products may contain interpolated values at some grid points. Those process by which each product is created is described in the SIS. Global map products are provided in equirectangular projections where the raster image extends from 0 to 360 degrees positive east longitudes in the sample direction and -90 to 90 degrees latitude extents from bottom to top in the line direction. Polar stereographic projections are provided for both the north and south poles. These projections are square images that extend from 65 degrees latitude poleward where the four centermost pixels surround the pole. Resolutions vary by product. Regional DEM products that highlight certain features on Mercury's surface were selected by team members. These products are provided in equirectangular projection with postive east longitudes. Longitude and resolution ranges vary by product. Dataset projections are given in DEM_EQU_MAP.CAT and DEM_POLAR_MAP.CAT. Geospatially labelled, JPEG 2000 format products for each DEM are also provided. PDS compliant .LBL and XML files accompany each JPEG 2000 file. Pixel level information can be read from these files using an appropriate reader. The data providers do not provide support for commercially available data analysis products. Additionally, internally produced software for the visualization or interpretation of data products is not provided. The file names developed for this PDS archive are restricted to a maximum 36-character base name and 3 character extension name with a period separating the file and extension names. Also known as the '36.3' format, this is compliant with the ISO 9660 Level 2 specification (maximum of 40 characters), which is required by PDS. Global PRODUCT IDs are of the form: MSGR_DEM_iii_pp_c_Vnn.IMG where where: iii = producer institution USG = U.S. Geological Survey DLR = German Aerospace Center PSI = Planetary Science Institute ASU = Arizona State University pp = projection EQ = Equirectangular NP = North Polar Stereographic SP = South Polar Stereographic c = product code I = image format file J = JPEG 2000 file T = GEOTIFF file S = source product list file C = point cloud file nn = 2 digit version number The following is an example Global PRODUCT ID with a description of the individual components: MDGR_DEM_USG_NP_I_V01 For this image: Producer Institution = U. S. Geological Survey Projection = North Polar Stereographic Product Code = Image format file Version Number = 01 Regional PRODUCT IDs are of the form: MSGR_DEM_iii_pp_haaabbbb_mm_ss_c_Vnn.ext where: iii = producer institution ASU = Arizona State University pp = projection EQ = equirectangular 00 = not applicable h = hemisphere of center latitude. N = North S = South aaa = center latitude of projection in degrees (first two chars are whole degrees, third char is tenth of degree) (e.g., 23.4 degrees would be given as '234'.) bbbb= center longitude of projection in degrees measured eastward 0-359 (first three chars are whole degrees, third char is tenth of degree) (e.g., 251.5 degrees would be given as '2515'.) mm = product type DM = primary 32-bit DEM product OR = 16-bit orthophoto SR = shaded relief map CR = color-shaded relief map CL = legend associated with the color-shaded relief map SM = slope map SL = slope map legend CF = confidence product ss = map scale in km/pixel truncated to the nearest integer, '00' if not applicable c = product code I = image format file J = JPEG 2000 file T = GEOTIFF file S = source product list file C = point cloud file nn = 2 digit version number The following is an example Regional PRODUCT ID with a description of the individual components: MSGR_DEM_ASU_EQ_N2180000_DM_81_I_V01 For this image: Producer Institution = Arizona State University Projection = Equatorial Centroid of image = 21.8N, 000.0. Product class = standard 32-bit DEM Map scale = 81 km/pixel Product Code = Image format file Version Number = 01 DEM file names are of the form PRODUCT_ID.ttt where: ttt = file type .IMG = PDS image format .JP2 = JPEG 2000 format .LBL = PDS label file .TXT = ancillary file, list of source product IDs .TAB = ancillary table data file .XML = auxiliary file containing XML metadata relating to some JPEG 2000 products " CONFIDENCE_LEVEL_NOTE = " Confidence Level Overview ========================= Known issues of concern are described below. Review ====== This archival data set will be examined by a peer review panel prior to its acceptance by the Planetary Data System (PDS). The peer review will be conducted in accordance with PDS procedures. Data Coverage and Quality ========================= The USGS DEM has been compared with the MLA and radar occultation combined product for accuracy. Additional comparisons will be made, and the results published in a peer-reviewed paper." END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_MISSION MISSION_NAME = "MESSENGER" END_OBJECT = DATA_SET_MISSION OBJECT = DATA_SET_TARGET TARGET_NAME = "MERCURY" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = MESS INSTRUMENT_ID = {"MDIS-NAC","MDIS-WAC"} END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "HAWKINSETAL2007" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "HAWKINSETAL2009" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END