Chamberlin Trimetric¶
Classification |
Miscellaneous |
Available forms |
Forward spherical projection |
Defined area |
Global |
Alias |
chamb |
Domain |
2D |
Input type |
Geodetic coordinates |
Output type |
Projected coordinates |

proj-string: +proj=chamb +lat_1=10 +lon_1=30 +lon_2=40
¶
Parameters¶
Required¶
Note
Control points should be oriented clockwise.
- +lat_1=<value>¶
Latitude of the first control point.
- +lon_1=<value>¶
Longitude of the first control point.
- +lat_2=<value>¶
Latitude of the second control point.
- +lon_2=<value>¶
Longitude of the second control point.
- +lat_3=<value>¶
Latitude of the third control point.
- +lon_3=<value>¶
Longitude of the third control point.
Optional¶
- +lon_0=<value>¶
Longitude of projection center.
Defaults to 0.0.
Note
The default convention is to interpret this value as decimal degrees. To specify radians instead, follow the value with the "r" character.
Example: +lon_0=1.570796r
See Projection Units for more information.
- +R=<value>¶
Radius of the sphere, given in meters. If used in conjunction with
+ellps
,+R
takes precedence.See Ellipsoid size parameters for more information.
- +x_0=<value>¶
False easting.
Defaults to 0.0.
- +y_0=<value>¶
False northing.
Defaults to 0.0.