public class Geostationary
extends Object
Describe: https://cf-pcmdi.llnl.gov/trac/ticket/72
Accepted for CF-1.7
grid_mapping_name = geostationary
Map parameters:
latitude_of_projection_origin
longitude_of_projection_origin
perspective_point_height
false_easting
false_northing
sweep_angle_axis
fixed_angle_axis
Map coordinates:
The x (abscissa) and y (ordinate) rectangular coordinates are identified by the standard_name attribute value projection_x_coordinate and projection_y_coordinate
respectively. In the case of this projection, the projection coordinates in this projection are directly related to the scanning angle of the satellite instrument,
and their units are radians.
Notes:
The algorithm for computing the mapping may be found at http://www.eumetsat.int/idcplg?IdcService=GET_FILE&dDocName=PDF_CGMS_03&RevisionSelectionMethod=LatestReleased.
This document assumes the point of observation is directly over the equator, and that the sweep_angle_axis is y.
Notes on using the PROJ.4 software packages for computing the mapping may be found at http://trac.osgeo.org/proj/wiki/proj%3Dgeos and
http://remotesensing.org/geotiff/proj_list/geos.html .
The "perspective_point_height" is the distance to the surface of the ellipsoid. Adding the earth major axis gives the distance from the centre of the earth.
The "sweep_angle_axis" attribute indicates which axis the instrument sweeps. The value = "y" corresponds to the spin-stabilized Meteosat satellites,
the value = "x" to the GOES-R satellite.
The "fixed_angle_axis" attribute indicates which axis the instrument is fixed. The values are opposite to "sweep_angle_axis". Only one of those two attributes are
mandatory.
- Since:
- 12/5/13
- Author:
- caron