PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2017-05-12 NOTE = "Description of contents of the EXTRAS directory" END_OBJECT = TEXT END ============================================================================= MDIS SHAPEFILES ============================================================================= The MDIS EXTRAS directories contain shapefiles that record the MDIS image coverage area of Mercury during the orbital mission. In addition to the spatial coverage info, each record has attributes describing the image. These attributes are extracted from the PDS labels. Please see http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf for a description of the shapefile format. MDIS image footprints ===================== Individual MDIS image footprints polygons. img_footprints/cumulative All images during orbital mission img_footprints/controlled_only Subset of images in USGS global control set Image polygon attributes contained in shapefiles obs_id[INT] -- image observation ID filename -- image filename ydoy_path -- Year, Day of Year storage path. i.e. (2015_001) obs_type -- text description of intent of image site_id -- for targeted images, the ID of the site of interest instr_id -- imager, MDIS-NAC or MDIS-WAC dqi -- data quality ID, see Data Product SIS for description phase_name -- Name of mission phase. i.e. "MERCURY ORBIT YEAR 4" start_time -- Image exposure start time seq_name -- Unused for MESSENGER Mercury orbit phases sc_alt[FLOAT] -- spacecraft altitude met_exp[FLOAT] -- MET assigned to exposure (not the exposure start) det_temp[FLOAT] -- Detector temperature in degC exp_drtn[FLOAT] -- exposure duration in milliseconds filter_no[INT] -- filter number (1-12 for WAC, 0 for NAC) lines[INT] -- number of lines samples[INT] -- number of columns sat_pix[INT] -- number of saturated pixels center_lat[FLOAT] -- latitude of image center in degrees center_lon[FLOAT] -- longitude of image center in degrees slant_d[FLOAT] -- distance from camera to intercept of image center in km smear_mag[FLOAT] -- smear magnitude in pixels i_angle[FLOAT] -- solar incidence angle of image center in degrees p_angle[FLOAT] -- solar phase angle of image center in degrees e_angle[FLOAT] -- emission angle of image center in degrees hor_scale[FLOAT] -- horizontal pixel scale of image center in meters ver_scale[FLOAT] -- vertical pixel scale of image center in meters Quality scores used for stacking images into a map (lower is better) These are based on combinations of image resolution, incidence and emission and often have a favored 'optimal' incidence angle which scores best bdr_metric[FLOAT] -- alternate for monochrome map (68deg incidence) bdr_met2[FLOAT] -- alternate formula monochrome map mdr_metric[FLOAT] -- 8-color map hsi_metric[FLOAT] -- high-incidence map alb_metric[FLOAT] -- albedo, or low-incidence map md3_metric[FLOAT] -- 3-color map bdr_i71met[FLOAT] -- alternate for monochrome map (71deg incidence) bdr_i74met[FLOAT] -- used for BDR monochrome map (74deg incidence) bdr_i74me2[FLOAT] -- alternate for monochrome map (74deg incidence) bdr_i77met[FLOAT] -- alternate for monochrome map (77deg incidence) hii_i80met[FLOAT] -- alternate for high-incidence mono-maps (80deg incidence) hii_i83met[FLOAT] -- alternate for high-incidence mono-maps (83deg incidence) hii_i86met[FLOAT] -- used for HIE and HIW maps (86deg incidence) piv_goal[FLOAT] -- goal angle for pivot platform in counts (when applicable) piv_pos[FLOAT] -- pivot angle for pivot platform in counts piv_read[FLOAT] -- pivot resolver angle in counts comp12_8[FLOAT] -- 12 to 8 bit compression flag comp_alg[FLOAT] -- 8 bit lookup table number used for compression smear_az[FLOAT] -- smear azimuth in degrees north_az[FLOAT] -- north azimuth in degrees sub_sc_az[FLOAT] -- sub-spacecraft point aziumuth in degrees sub_sol_az[FLOAT] -- sub-solar point azimuth in degrees wvl_ratio[INT] -- wavelet compression ratio sub_sc_lat[FLOAT] -- sub-spacecraft point latitude in degrees sub_sc_lon[FLOAT] -- sub-spacecraft point longitude in degrees subsol_lat[FLOAT] -- sub-solar point latitude in degrees subsol_lon[FLOAT] -- sub-solar point longitude in degrees sub-solar ground azimuth values subsol_ga[FLOAT] -- computed using sub-solar azimuth and north azimuth subsol_ga2[FLOAT] -- computed using image center lat/lon and sub-solar lat/lon Color footprint shapefiles ========================== Polygons are image shared area for MDIS image colorsets. Each record represents the overlap of a set of color images. clr_footprints/mdr 8-color global campaign clr_footprints/md3 3-color campaign clr_footprints/md3/H01 3-color campaign color set used for north polar map tile H01 clr_footprints/mp5 Min-phase 5-color northern area map campaign clr_footprints/clr_targets Three shapefiles for 3, 8, and 11 color targets clr_footprints/clr_regions Two shapefiles for 3-color Caloris and B30 regions Colorset polygon attributes contained in shapefiles start_obs[INT] -- first observation ID (in time) for this set obs_list -- list of all observation IDs in the set src_shp -- image footprint shapefile used to generate this record seq_type -- campaign the sequence belongs to. i.e. MDR WAC 8-bands seq_length[INT] -- number of images in colorset sequence seq_hscale[FLOAT] -- horizontal pixel scale of first image seq_i[FLOAT] -- solar incidence of center pixel in first image seq_p[FLOAT] -- solar phase of center pixel in first image seq_e[FLOAT] -- emission angle of center pixel in first image mdr_metric[FLOAT] -- 8-color map quality score for first image site_id[INT] -- for targeted images, the ID of the site of interest det_temp[FLOAT] -- detector temperature of first image in degC ============================================================================= MDIS MP5 Browse Image ============================================================================= A PNG format browse image (*.PNG) of the MDIS 5-color Map Projected Multispectral Reduced Data Records (MP5) product is provided in the EXTRAS/BROWSE/H01/ directory. It is accompanied by a GDAL-compatible map projection metadata file in XML format. This product is named the same as its associated PNG files, except that it has a ".PNG.aux.xml" file extension. This filename is retained for compatibility with GDAL-based software.