PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2014-12-01, P. Garcia prepared; 2016-04-01, JHUAPL:M. Reid/S. Ensor revised." 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 = 2016-05-06 PRODUCER_FULL_NAME = "KRIS BECKER" DETAILED_CATALOG_FLAG = "N" CITATION_DESC = "K. Becker, M. Robinson, F. Pruesker, 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 2,439.4 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) techniques. The primary PDS product is a DEM provided in both PDS image (.IMG) and JPEG 2000 (.JP2) format files. Associated with some of the DEM products is a list of lower-level MDIS products provided either as an accompanying table (*.TAB) file or as text (*.TXT) files in the EXTRAS directory." 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 simple cylindrical 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 accompany the USGS and DLR DEMs. GeoTIFF format products in the EXTRAS directory accompany the ASU DEMs. PDS compliant .LBL files accompany each JPEG 2000 file. Supporting .XML files accompany the USGS JPEG 2000 products from which pixel level information can be read using an appropriate reader. The data providers do not provide support for commercially available data analysis products. No internally produced software for the visualization or interpretation of data products is 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. USGS DEM PRODUCT IDs are of the form: MSGR_DEM_iii_pp_c_Vnn.IMG where where: iii = producer institution USG = U.S. Geological Survey pp = projection SC = Simple Cylindrical NP = North Polar Stereographic SP = South Polar Stereographic 00 = not applicable c = product code I = image format file J = JPEG 2000 file S = source product list file C = point cloud file nn = 2 digit version number The following is an example POLAR 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 DLR PRODUCT IDs are of the form: MSGR_DEM_DLR_pp_Haa_mm_sss_c_Vnn.ext where: iii = producer institution DLR = German Aerospace Center pp = projection EQ = equirectangular 00 = not applicable aa = the IAU-defined quadrangle number on planet Mercury 00-11 mm = product type DM = primary 16-bit DEM product sss = map scale in m/pixel truncated to the nearest integer, '000' if not applicable c = product code I = image format file J = JPEG 2000 file P = PNG file (if available for EXTRAS directory) nn = 2 digit version number The following is an example Regional PRODUCT ID with a description of the individual components: MSGR_DEM_DLR_EQ_H06_DM_222_I_V01 For this image: Producer Institution = German Aerospace Center (DLR) Projection = Equatorial Covers H06 quadrangle Product class = standard 16-bit DEM Map scale = 222 m/pixel Product Code = Image format file Version Number = 01 Regional ASU PRODUCT IDs are of the form: MSGR_DEM_ASU_pp_aaaaabb_mm_sss_c_Vnn.ext iii = producer institution ASU = Arizona State University pp = projection EQ = equirectangular 00 = not applicable aaaaa = designation of the site name that the DEM covers bb = designation of the stereo pair = a uniquely numbered integer stereo pair for the site MS = mosaic of the site containing all the stereo paris mm = product type DM = primary 16-bit DEM product CF = confidence map CL = legend associated with the color-shaded relief map CS = color-shaded relief map OR = 16-bit orthorectified image SL = slope map legend SM = slope map TS = terrain shaded relief map RM = readme file (located in INDEX/REGIONAL directory) ss = map scale in m/pixel truncated to the nearest integer, 00 if not applicable c = product code I = image format file T = GEOTIFF file (if available for EXTRAS directory) S = source product list file nn = 2 digit version number 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 free format text file .TAB = ancillary table data file .XML = auxiliary file containing XML metadata relating to some JPEG 2000 products .TIF = TIFF files " CONFIDENCE_LEVEL_NOTE = " Confidence Level Overview ========================= Known issues of concern are described in the DEM SIS. Review ====== This archival data set was examined by a peer review panel prior to its acceptance by the Planetary Data System (PDS). The peer review was conducted in accordance with PDS procedures. Data Coverage and Quality ========================= Descriptions of data coverage and quality are included in the DEM SIS." 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