Projection System

Basic example

This is the simplest projection that will automatically create a GeoTIFF image (for later use in other software) of the proper size and projected using the equirectangular projection. It will then be explained further later.

"Composite Name": {
   "equation": "ch2, ch2, ch1",
   "project": {
      "config": {
         "type": "equirec",
         "auto": true,
         "scalar_x": 0.016,
         "scalar_y": -0.016
      },
      "draw_map_overlay": true,
      "individual_equalize": true,
      "img_format": ".tif"
   }
}

Projection types

type :

equirec (equirectangular)
stereo (sterographic)
utm (Universal Transverse Mercator)
geos (for geostationary satellites)
tpers
webmerc

Common parameters for all projections

These can be omitted in automatic mode, or can be set anyway to override. If they are omitted but needed, they default to zero.

lat0 (float) Latitude of the origin of the projection

lon0 (float) Longitude of the origin of the projection

offset_x (float) Offset of the projection from the center (in meters)

offset_y (float) Offset of the projection from the center (in mesters)

scalar_x (float) Scale of the projection (in meters per pixel)

scalar_y (float) Scale of the projection (in meters per pixel)

Extra parameters for UTM

zone: (int) UTM zone

south: (boolean) if you’re north (false) or south (true) of the equator

Extra parameters for GEOS

altitude: (float) Altitude of the satellite (in meters)

sweep_x: (boolean) Sweep mode of the GEOS projection

Extra parameters for TPERS

altitude: (float) Altitude of the satellite (in meters)

tilt: (float) Tilt of the satellite (in degrees)

azimuth: (float) Azimuth of the satellite (in degrees)

Alternative mode for Stereo

Mandatory:

center_lat (float) Latitude of the center of the projection (degrees)
center_lon (float) Longitude of the center of the projection (degrees)
scale (float) Scale of the image(meters per pixel)
width (int) Width of the image (in pixels)
height (int) Height of the image (in pixels)

Alternative mode for TPERS

Mandatory:

center_lat (float) Latitude of the center of the projection (degrees)
center_lon (float) Longitude of the center of the projection (degrees)
scale (float) Scale of the image(meters per pixel)
width (int) Width of the image (in pixels)
height (int) Height of the image (in pixels)

Optional:

altitude: (float) Altitude of the satellite (in meters)
tilt: (float) Tilt of the satellite (in degrees)
azimuth: (float) Azimuth of the satellite (in degrees)

Alternative mode for UTM

Mandatory:

scale (float) Scale of the image(meters per pixel)
width (int) Width of the image (in pixels)
height (int) Height of the image (in pixels)

Optional:

zone: (int) UTM zone
south: (boolean) if you’re north (false) or south (true) of the equator