Grid 90: Space view perspective or orthographic
Grids
| Octets | Key | Type | Content |
| 7-8 | Nx | unsigned | Nx number of points along x-axis (columns) |
| 9-10 | Ny | unsigned | Ny number of points along y-axis (rows or lines) |
| 11-13 | latitudeOfSubSatellitePoint | signed | Lap latitude of sub-satellite point |
| 14-16 | longitudeOfSubSatellitePoint | signed | Lop longitude of sub-satellite point |
| 17 | resolutionAndComponentFlags | codeflag | Resolution and component flags (see Code table 7) |
| 18-20 | dx | unsigned | dx apparent diameter of Earth in grid lengths, in x-direction |
| 21-23 | dy | unsigned | dy apparent diameter of Earth in grid lengths, in y-direction |
| 24-25 | Xp | unsigned | Xp x-coordinate of sub-satellite point |
| 26-27 | Yp | unsigned | Yp y-coordinate of sub-satellite point |
| 28 | scanningMode | codeflag | Scanning mode (flags see Flag/Code table 8) |
| 29-31 | orientationOfTheGrid | unsigned | Orientation of the grid; i.e. the angle in millidegrees between the increasing y-axis and the meridian of the sub-satellite point in the direction of increasing latitude (see Note (3)) |
| 32-34 | Nr | unsigned | Nr - altitude of the camera from the Earth's centre, measured in units of the Earth's (equatorial) radius multiplied by a scale factor of 106 (see Note (4)) |
| 35-36 | Xo | unsigned | Xo x-coordinate of origin of sector image |
| 37-38 | Yo | unsigned | Yo y-coordinate of origin of sector image |
| 39-44 | Set to zero (reserved) |
( 1) It is assumed that the satellite is at its nominal position, i.e. it is looking directly at its sub-satellite point.
( 2) Octets 32-34 shall be set to all ones (missing) to indicate the orthographic view (from infinite distance).
( 3) It is the angle between the increasing y-axis and the meridian 180°E if the sub-satellite point is the North Pole; or the meridian 0° if the sub-satellite point is the South Pole.
( 4) The apparent angular size of the Earth will be given by 2 x Arcsin (1/Nr).
( 5) The horizontal and vertical angular resolutions of the sensor (Rx and Ry), needed for navigation equations, can be calculated from the following: Rx = 2 x Arcsin (1/Nr) / dx Ry = 2 x Arcsin (1/Nr) / dy