PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2022-04-24 NOTE = "Description of contents of BROWSE directory" END_OBJECT = TEXT END MRDR browse products are organized into 30 subdirectories named by the Mars Chart containing the latitude and longitude of its upper left corner, e.g. MC01. Latitude and longitude limits of Mars Charts are given below. Identifer Chart Name Latitude Range Longitude Range MC01 Mare Boreum 60 to 90 -180 to 180 MC02 Diacria 30 to 60 -180 to -120 MC03 Arcadia 30 to 60 -120 to -60 MC04 Mare Acidalium 30 to 60 -60 to 0 MC05 Ismenius Lacus 30 to 60 0 to 60 MC06 Casius 30 to 60 60 to 120 MC07 Cebrenia 30 to 60 60 to 180 MC08 Amazonis 0 to 30 -180 to -135 MC09 Tharsis 0 to 30 -135 to -90 MC10 Lunae Palus 0 to 30 -90 to -45 MC11 Oxia Palus 0 to 30 -45 to 0 MC12 Arabia 0 to 30 0 to 45 MC13 Syrtis Major 0 to 30 45 to 90 MC14 Amenthes 0 to 30 90 to 135 MC15 Elysium 0 to 30 135 to 180 MC16 Memnonia 0 to -30 -180 to -135 MC17 Phoenicis Lacus 0 to -30 -135 to -90 MC18 Coprates 0 to -30 -90 to -45 MC19 Margaritifer Sinus 0 to -30 -45 to 0 MC20 Sinus Sabaeus 0 to -30 0 to 45 MC21 Iapygia 0 to -30 45 to 90 MC22 Mare Tyrrhenum 0 to -30 90 to 135 MC23 Aeolis 0 to -30 135 to 180 MC24 Phaethontis -30 to -60 -180 to -120 MC25 Thaumasia -30 to -60 -120 to -60 MC26 Argyre -30 to -60 -60 to 0 MC27 Noachis -30 to -60 0 to 60 MC28 Hellas -30 to -60 60 to 120 MC29 Eridania -30 to -60 120 to 180 MC30 Mare Australe -60 to -90 -180 to 180 BROWSE PRODUCTS FOR VERSION 4 MRDRs The MRDR browse product set consists of three data files and a detached PDS label file. The label file contains the metadata and pointers to the three data files. The three data files are 1) an IMG file containing the browse product image as a three-band PDS IMAGE object; 2) a PNG file containing the browse product image in the Portable Network Graphics file format (three bands and an alpha transparency channel); and 3) a HDR file associated with the IMG file which stores file format (and map projection information) in the ENVI header format. This allows users of the ENVI image processing software to readily read in the image data. The SOURCE_PRODUCT_ID keyword in the PDS label links the browse products to the source MTRDR. The following formulations are used. Abbreviation = TRU Name = True color R Component = R600 G Component = R530 B Component = R440 Additional description: An enhanced natural color representation of the scene composed of spectral channels across the visible spectrum. Contrast greater than the human eye would see. Abbreviation = VNA Name = VNIR albedo R Component = R770 G Component = R770 B Component = R770 Additional description: Reflectance at 770 nm as a proxy for VNIR albedo and may be used to correlate spectral variations with morphology. Abbreviation = FEM Name = Fe Minerals R Component = BD530_2 G Component = SH600_2 B Component = BDI1000VIS Additional description: Mafic minerals appear blue, nanophase ferric oxides red, and dust-coated mafic rocks or lithified dust yellow/green. Abbreviation = FM2 Name = Fe minerals, v2 R Component = BD530_2 G Component = BD920_2 B Component = BDI1000VIS Additional description: Mafic minerals appear blue, crystalline hematite green or yellow, and nanophase ferric oxides red. Abbreviation = TAN Name = Tandem R Component = R2529 G Component = IRA B Component = R770 Additional description: Enhanced visible to infrared false color representation of the scene, incorporating spectral data from both (VNIR and IR) detectors. Abbreviation = IRA Name = IR albedo R Component = R1300 G Component = R1300 B Component = R1300 Additional description: Reflectance at 1330 nm as a proxy for IR albedo and may be used to correlate spectral variations with morphology. Abbreviation = FAL Name = False color R Component = R2529 G Component = R1506 B Component = R1080 Additional description: Red to orange coloration is typically characteristic of olivine-rich material, blue/green colors are often indicative of clay mineralogy, green colors may indicate carbonate, and gray/brown colors often indicate basaltic material. Abbreviation = MAF Name = Mafic mineralogy R Component = OLINDEX3 G Component = LCPINDEX2 B Component = HCPINDEX2 Additional description: Olivine and Fe-phyllosilicate share a 1000-1700 nm bowl-shaped absorption and will appear red in the MAF browse product. Low- and high-Ca pyroxene display an additional ~2000-nm absorption and appear green/cyan and blue/magenta respectively. Abbreviation = HYD Name = Hydrated mineralogy R Component = SINDEX2 G Component = BD2100_2 B Component = BD1900_2 Additional description: Polyhydrated sulfates have strong 1900 nm and 2400 nm absorption bands, and thus appear magenta in the HYD browse product. Monohydrated sulfates have a strong 2100 nm absorption and a weak 2400 nm absorption band, and thus appear yellow/green in the HYD browse product. Blue colors are indicative of other hydrated minerals (such as clays, glass, carbonate, or zeolite). Abbreviation = PHY Name = Phyllosilicates R Component = D2300 G Component = D2200 B Component = BD1900r2 Additional description: Fe/Mg-OH bearing minerals (e.g., Fe/Mg-phyllosilicate) will appear red, or magenta (when hydrated). Al/Si-OH bearing minerals (e.g., Al-phyllosilicates or hydrated silica) will appear green, or cyan (when hydrated). Blue colors are indicative of other hydrated minerals (such as sulfates, glass, carbonate, or water ice). Abbreviation = PFM Name = Phyllosilicates with Fe and Mg R Component = BD2355 G Component = D2300 B Component = BD2290 Additional description: Red/yellow colors indicate the presence of prehnite, chlorite, epidote, or Ca/Fe carbonate, while cyan colors indicate the presence of Fe/Mg-smectites or Mg-carbonate. Abbreviation = PAL Name = Phyllosilicates with Al R Component = BD2210_2 G Component = BD2190 B Component = BD2165 Additional description: Red/yellow colors indicate the presence of Al-smectites or hydrated silica, cyan colors may indicate the alunite, and light/white colors indicate the presence of kaolinite group minerals. Abbreviation = HYS Name = Hydrated silica R Component = MIN2250 G Component = BD2250 B Component = BD1900r2 Additional information: Light red/yellow colors indicate the presence of hydrated silica, whereas cyan colors indicate Al-OH minerals. Additionally, jarosite will appear yellow. Blue colors are indicative of other hydrated minerals (such as sulfates, clays, glass, carbonate, or water ice). Abbreviation = ICE Name = Ices R Component = BD1900_2 G Component = BD1500_2 B Component = BD1435 Additional information: CO2 frost or ice displays a sharp 1435-nm absorption and thus appears blue in the ICE browse product. Water ice or frost has a strong 1500 nm absorption and thus appears green in the ICE browse product. Red colors are indicative of hydrated minerals (such as sulfates, clays, glass, carbonate, or water ice). Abbreviation = IC2 Name = Ices, v2 R Component = R3920 G Component = BD1500_2 B Component = BD1435 Additional information: CO2 frost or ice displays a sharp 1435-nm absorption and thus appears blue in the IC2 browse product. Water ice or frost has a strong 1500 nm absorption and thus appears green in the IC2 browse product. The 3920-nm spectral channel is a discriminator for icy vs. ice-free material with ices having a lower solar reflected and thermal emission radiance at this wavelength, so ice-free material appears red. Abbreviation = CHL Name = Chloride R Component = ISLOPE G Component = BD3000 B Component = IRR2 Additional information: Martian chloride deposits have a relatively positive near-infrared spectral slope and are comparatively desiccated, so chlorides appear blue in the CHL browse product. Yellow/green colors are indicative of hydrated minerals, especially phyllosilicates. Abbreviation = CAR Name = Carbonates R Component = D2300 G Component = BD2500H2 B Component = BD1900_2 Additional information: Blueish- or yellowish-white colors indicate Mg-carbonate, while red/magenta colors indicate Fe/Mg-phyllosilicate. Blue colors are indicative of other hydrated minerals (such as sulfates, clays, glass, or carbonate). Abbreviation = CR2 Name = Carbonates, v2 R Component = MIN2295_2480 G Component = MIN2345_2537 B Component = CINDEX2 Additional information: Red/magenta colors indicate Mg-carbonates, while green/cyan colors indicate Fe/Ca-carbonates.