{
  "body": "mars",
  "title": "Tianwen-1 MoRIC global colour orthomosaic",
  "source": "https://alasky.cds.unistra.fr/MocServer/query?ID=CDS/P/Mars/Tianwen1-MoRIC&get=record&fmt=html",
  "originalProduct": "https://doi.org/10.12350/CLPDS.GRAS.TW1.MoRIC-DOM_076_Global.vA",
  "paper": "https://doi.org/10.1016/j.scib.2024.04.045",
  "credit": "Tianwen-1 MoRIC / NAOC / GRAS / Chinese Academy of Sciences; HiPS and cutouts: CDS / Universit\u00e9 de Strasbourg / CNRS",
  "license": "ODbL-1.0, as declared for the CDS HiPS database. This derived WebP tile database is also available under ODbL-1.0; original observation rights remain with NAOC / GRAS.",
  "licenseUrl": "https://opendatacommons.org/licenses/odbl/1-0/",
  "hips": "https://alasky.cds.unistra.fr/Planets/CDS_P_Mars_Tianwen1-MoRIC",
  "observations": "MoRIC visible-light images, November 2021\u2013July 2022; photometric/geometric correction and true-colour reconstruction by the source team.",
  "nativeSurveyMetresPerPixel": 76,
  "limitations": "The downloadable colour map is resampled to 16384 \u00d7 8192 (about 1.3 km/pixel at the equator). The existing CTX/HiRISE landing-site images remain separate, finer layers. Seasonal polar/cloud appearance belongs to the source observations.",
  "coordinates": "Planetocentric latitude; east longitude -180 to +180; north-up; zero longitude in the centre.",
  "cutoutProcessing": "CDS hips2fits: four 4096 \u00d7 8192 CAR strips, fov 180 degrees, centres -135/-45/45/135 east longitude and latitude 0; inverse_longitude=true; PNG, min_cut=0, max_cut=255, linear. No per-strip histogram stretching.",
  "inputSha256": "62a3a18fdb0edf476abc45db389f088e8bc782b88f951f320b9feab94d3fae35",
  "inputSize": [
    16384,
    8192
  ],
  "inputBytes": 153494491,
  "tileSize": 512,
  "gutter": 2,
  "levels": 4,
  "faces": 6,
  "tiles": 510,
  "totalWebpBytes": 21521926,
  "tileMinBytes": 14122,
  "tileMaxBytes": 90926,
  "overviewBytes": {
    "1024": 120250,
    "2048": 459806
  },
  "quality": 94,
  "qualitySamples": [
    {
      "face": 0,
      "psnr": 42.22,
      "meanAbsoluteError": 1.457
    },
    {
      "face": 1,
      "psnr": 45.2,
      "meanAbsoluteError": 0.989
    },
    {
      "face": 2,
      "psnr": 42.56,
      "meanAbsoluteError": 1.401
    },
    {
      "face": 3,
      "psnr": 42.89,
      "meanAbsoluteError": 1.38
    },
    {
      "face": 4,
      "psnr": 44.61,
      "meanAbsoluteError": 1.104
    },
    {
      "face": 5,
      "psnr": 44.02,
      "meanAbsoluteError": 1.167
    }
  ],
  "processing": "North-up -180..180 east-longitude sRGB input; bilinear cube reprojection, Lanczos mipmaps, WebP quality 94. No generated detail or colour adjustment.",
  "colourCalibration": "Source team: atmospheric and Lommel-Seeliger photometric corrections; MMS visible reflectance converted using CIE 1931 colour matching; MoRIC colour correction matrix and Korolev ice/snow white-balance reference. See Liu et al. (2024).",
  "colourReference": "https://science.nasa.gov/asset/hubble/true-color-image-of-mars/",
  "closeRangeColour": "Monochrome CTX and HiRISE imagery supplies finer brightness detail. Its colour is inherited from this coarser Tianwen-1 map; it is not independently measured sub-metre RGB.",
  "northPolarDetail": {
    "survey": "https://alasky.cds.unistra.fr/Planets/CDS_P_Mars_Tianwen1-MoRIC",
    "request": {
      "url": "https://alasky.cds.unistra.fr/hips-image-services/hips2fits?hips=CDS%2FP%2FMars%2FTianwen1-MoRIC&wcs=%7B%22NAXIS%22%3A+2%2C+%22NAXIS1%22%3A+4104%2C+%22NAXIS2%22%3A+4104%2C+%22WCSAXES%22%3A+2%2C+%22CTYPE1%22%3A+%22RA---TAN%22%2C+%22CTYPE2%22%3A+%22DEC--TAN%22%2C+%22CRVAL1%22%3A+270%2C+%22CRVAL2%22%3A+90%2C+%22CRPIX1%22%3A+2052.5%2C+%22CRPIX2%22%3A+2052.5%2C+%22CDELT1%22%3A+0.006994113710093057%2C+%22CDELT2%22%3A+0.006994113710093057%2C+%22CUNIT1%22%3A+%22deg%22%2C+%22CUNIT2%22%3A+%22deg%22%7D&width=4104&height=4104&format=png&min_cut=0&max_cut=255&stretch=linear",
      "wcs": {
        "NAXIS": 2,
        "NAXIS1": 4104,
        "NAXIS2": 4104,
        "WCSAXES": 2,
        "CTYPE1": "RA---TAN",
        "CTYPE2": "DEC--TAN",
        "CRVAL1": 270,
        "CRVAL2": 90,
        "CRPIX1": 2052.5,
        "CRPIX2": 2052.5,
        "CDELT1": 0.006994113710093057,
        "CDELT2": 0.006994113710093057,
        "CUNIT1": "deg",
        "CUNIT2": "deg"
      }
    },
    "inputSha256": "4ddd13a2af062ba6356fdf10a0cc18dac9995cc79d0849b9e5aa06cb8b9ca3ce",
    "inputSize": [
      4104,
      4104
    ],
    "inputBytes": 26983109,
    "processing": "Rotate the documented polar TAN cutout 180 degrees into cube +Y; Lanczos mipmaps; WebP quality 94. Same unmodified colour balance as the global source.",
    "coverage": "Cube face 2, u and v from 0.375 to 0.625. Covers the entire region north of 75.96 degrees, extending to 70.53 degrees in the square corners.",
    "levels": {
      "4": {
        "rowMin": 6,
        "rowMax": 9,
        "columnMin": 6,
        "columnMax": 9
      },
      "5": {
        "rowMin": 12,
        "rowMax": 19,
        "columnMin": 12,
        "columnMax": 19
      }
    },
    "metresPerPixelAtPole": 413.8,
    "tiles": 80,
    "totalWebpBytes": 3436422,
    "registrationCorrelationWithGlobalMap": 0.987307,
    "reference": "https://www.esa.int/ESA_Multimedia/Images/2017/02/Colour_mosaic_of_Mars_north_polar_ice_cap",
    "referenceUse": "ESA/DLR/FU Berlin HRSC mosaic used to check spiral trough geography only; no ESA pixels or colour processing copied."
  },
  "displayColour": "A restrained 1.25\u00d7 linear-light chroma enhancement around Rec.709 luminance is applied in the Mars material. It preserves neutral ice and is identical for the overview, streamed pages and terrain colour. This is an enhanced display, not a new scientific colour calibration. Source WebP pixels are unchanged; no distance-dependent tint."
}