Lib.Proj Namespace Reference

Classes
class	Proj
	Projection class. More...

Functions
	d2r (ll)
	Convenience function for converting a tuple of angles expressed in degrees to radians.
	r2d (xy)
	Convenience function for converting a tuple of angles expressed in radians to degrees.
	c2s (indata, pcs_id)
	Function for converting a lon/lat coordinate pair to a pair of PCS (projection-specific) coordinates.
	s2c (indata, pcs_id)
	Function for converting a PCS (projection-specific) XY coordinate pair to a lon/lat coordinate pair.
	ScaleResolutionFromReal (lat, scale)
	Function for converting real resolution on the Earth's surface (meters) to projection-specific resolution.
	RealResolutionFromScale (lat, scale)
	Function for converting projection-specific resolution real resolution on the Earth's surface (meters).

Variables
	error = _proj.error
	Exception.
	dmstor = _proj.dmstor
	Helper.
float	dr = math.pi / 180.0
	degrees to radians
float	rd = 180.0 / math.pi
	radians to degrees

Detailed Description

Copyright (C) 1997 - Swedish Meteorological and Hydrological Institute (SMHI)

This file is part of RAVE.

RAVE is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

RAVE is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with RAVE.  If not, see <http://www.gnu.org/licenses/>.

Function Documentation

c2s()

Lib.Proj.c2s	(		indata,
			pcs_id )

Function for converting a lon/lat coordinate pair to a pair of PCS (projection-specific) coordinates.

Parameters

ll	variable-length tuple containing lon/lat coordinate pairs
pcs_id	string identifier of the projection to use. Check registered projections using 'projection_rgistry'

Returns

tuple of PCS XY coordinate pairs

d2r()

Lib.Proj.d2r

(

ll

)

Convenience function for converting a tuple of angles expressed in degrees to radians.

Parameters

ll	tuple of angles expressed in degrees

Returns

tuple of angles expressed in radians

r2d()

Lib.Proj.r2d

(

xy

)

Convenience function for converting a tuple of angles expressed in radians to degrees.

Parameters

xy	tuple of angles expressed in radians

Returns

tuple of angles expressed in degrees

RealResolutionFromScale()

Lib.Proj.RealResolutionFromScale	(		lat,
			scale )

Function for converting projection-specific resolution real resolution on the Earth's surface (meters).

Based on Petr Novak's work reported to OPERA.

Parameters

lat	float latitude position
scale	float resolution in projection-specific space

Returns

float surface resolution on the Earth in meters

s2c()

Lib.Proj.s2c	(		indata,
			pcs_id )

Function for converting a PCS (projection-specific) XY coordinate pair to a lon/lat coordinate pair.

Parameters

xy	tuple of PCS XY coordinates
pcs_id	string identifier of the projection to use. Check registered projections using 'projection_rgistry'

Returns

tuple of lon/lat coordinates

ScaleResolutionFromReal()

Lib.Proj.ScaleResolutionFromReal	(		lat,
			scale )

Function for converting real resolution on the Earth's surface (meters) to projection-specific resolution.

Based on Petr Novak's work reported to OPERA.

Parameters

lat	float latitude position
scale	float surface resolution on the Earth in meters

Returns

float representing the resolution expressed in projection-specific space

Variable Documentation

dmstor

Lib.Proj.dmstor = _proj.dmstor

Helper.

dr

float Lib.Proj.dr = math.pi / 180.0

degrees to radians

error

Lib.Proj.error = _proj.error

Exception.

rd

float Lib.Proj.rd = 180.0 / math.pi

radians to degrees