An image coordinate system defines the spatial reference in terms of a primary image. A primary image displayed in its own image coordinate system exhibits no distortions; other images and features can be projected to overlap with the primary image using its image coordinate system. Many imagery-centric workflows require displaying images in image coordinate systems instead of map coordinates (geographic or projected coordinate systems); for example, oblique images are distorted significantly when displayed in map coordinates but can be displayed nicely in a top-up view without distortions.
Only image services support image coordinate systems. To get an image's image coordinate system, use Raster ICS; to project geometries between a geographic or projected coordinate system and an image coordinate system, use Project. Image coordinate systems can be used in image service operations when spatial reference or geometry parameters are needed.
{
  "icsid": <icsid> //an ics id is the objectid of the image in a mosaic dataset.
}{
  "icsid": 9,
}{
  "ics": <ics> //the full ics json, which include transformations and map spatial reference information and specific to each image.
}{
  "ics": {
    "name": "AMD_MAMD_CAT\\Raster.OBJECTID = 9",
    "alias":"",
    "abbreviation":"",
    "remarks":"",
    "geodataXform": {
      "xf_0": {
        "polynomialOrder":1,
        "spatialReference": {"wkid":null},
        "coeffX":[9623.012693429835,-0.9999999999964793,-2.6535897933527304E-6],
        "coeffY":[9566.987232235868,2.6535897933527304E-6,-0.9999999999964793],
        "inverseCoeffX":[9623.012693429835,-0.9999999999964793,-2.6535897933527304E-6],
        "inverseCoeffY":[9566.987232235868,2.6535897933527304E-6,-0.9999999999964793],
        "name":"",
        "type":"PolynomialXform"
      },
      "xf_1": {
        "spatialReference":{"wkid":null},
        "coefficients":[1,0,0,0,1,-9567],
        "cellsizeRatio":0,
        "type":"GeometricXform"
      },
      "xf_2": {
        "spatialReference":{"wkid":54004,"latestWkid":54004},
        "constantZ":355.956,
        "ZFactor":1,
        "ZOffset":0,
        "correctGeoid":false,
        "requireDEM":false,
        "interiorOrientation": {
          "polynomialOrder":1,
          "spatialReference":{"wkid":null},
          "coeffX":[-122009.1743773452,25.00342950222755,-0.0022927308709069037],
          "coeffY":[120345.98809819827,0.004618452740478162,24.9975640326764],
          "inverseCoeffX":[4879.256039082114,0.0399945128715,3.6682236000000004E-6],
          "inverseCoeffY":[-4815.210096242967,-7.3892307E-6,0.0400038972498],
          "name":"",
          "type":"PolynomialXform"
        },
        "konrady":true,
        "konradyParameters":[-1.2603314589834097E-5,1.6224555868275652E-15,-3.6421117033555566E-26,0,0],
        "konradyType":"esriRasterKonradyESRI",
        "curvatureAndRefraction":true,
        "earthRadius":6378137,
        "averageZ":355.956,
        "principalPoint":{"x":-7,"y":-9},
        "focalLength":153643,
        "polarity":-1,
        "sensorPosition":{"x":4490522.42482,"y":5479087.21653,"z":1124.11318},
        "exteriorOrientation":[-0.02457152019,-0.999287714912,0.028640936125,0.999696909733,-0.024517669223,0.002229925319,-0.001526127978,0.028687047991,0.999587276935],
        "clockwise":true,
        "type":"FrameXform"
      },
      "requireDEM":false,
      "type":"CompositeXform"
    },
    "extent":{"xmin":4489902.49613457,"ymin":5478442.107347395,"xmax":4491127.765586247,"ymax":5479675.116981766},
    "nativeExtent":{"xmin":-0.5,"ymin":-0.5,"xmax":9623.5,"ymax":9567.5},
    "dx":1,
    "dy":1,
    "type":"ImageCoordinateSystem"
  }
}