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Package pygeodesy :: Module osgr :: Class Osgr
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Class Osgr

  object --+        
           |        
named._Named --+    
               |    
named._NamedBase --+
                   |
                  Osgr

Ordnance Survey Grid References (OSGR) coordinates on the National Grid.

Instance Methods
 
__init__(self, easting, northing, datum=None, resolution=0, **name)
New Osgr coordinate.
 
__str__(self)
Default str(self).
 
parse(self, strOSGR, **name)
Parse an OSGR reference to a similar Osgr instance.
 
toLatLon(self, LatLon=None, datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran..., kTM=False, eps=1e-05, **LatLon_kwds)
Convert this Osgr coordinate to an (ellipsoidal) geodetic point.
 
toRepr(self, GD=None, fmt='[%s]', sep=', ', **prec)
Return a string representation of this Osgr coordinate.
 
toStr(self, GD=None, sep='', **prec)
Return this Osgr coordinate as a string.

Inherited from named._NamedBase: __repr__, others

Inherited from named._Named: __format__, __imatmul__, __matmul__, __rmatmul__, attrs, classof, copy, dup, methodname, rename, renamed, toStr2

Inherited from object: __delattr__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Properties
  datum
Get the datum (Datum).
  easting
Get the easting (meter).
  falsing0
Get the OS National Grid falsing (EasNor2Tuple).
  iteration
Get the most recent Osgr.toLatLon iteration number (int) or None if not available/applicable.
  latlon0
Get the OS National Grid origin (LatLon2Tuple).
  northing
Get the northing (meter).
  resolution
Get the OSGR resolution (meter, power of 10) or 0 if undefined.
  scale0
Get the OS National Grid central scale (scalar).

Inherited from named._Named: classname, classnaming, name, named, named2, named3, named4, sizeof

Inherited from object: __class__

Method Details

__init__ (self, easting, northing, datum=None, resolution=0, **name)
(Constructor)

 

New Osgr coordinate.

Arguments:
  • easting - Easting from the OS National Grid origin (meter).
  • northing - Northing from the OS National Grid origin (meter).
  • datum - Override default datum (Datums.OSGB36).
  • resolution - Optional resolution (meter), 0 for default.
  • name - Optional name=NN (str).
Raises:
  • OSGRError - Invalid or negative easting or northing or datum not an Datums.OSGB36 equivalent.
Overrides: object.__init__

__str__ (self)
(Informal representation operator)

 

Default str(self).

Overrides: object.__str__
(inherited documentation)

parse (self, strOSGR, **name)

 

Parse an OSGR reference to a similar Osgr instance.

Arguments:
  • strOSGR - The OSGR reference (str), see function parseOSGR.
  • name - Optional name=NN (str), overriding this name.
Returns:
The similar instance (Osgr)
Raises:

toLatLon (self, LatLon=None, datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran..., kTM=False, eps=1e-05, **LatLon_kwds)

 

Convert this Osgr coordinate to an (ellipsoidal) geodetic point.

Arguments:
  • LatLon - Optional ellipsoidal class to return the geodetic point (LatLon) or None.
  • datum - Optional datum to convert to (Datum, Ellipsoid, Ellipsoid2, Ellipsoid2 or a_f2Tuple).
  • kTM - If True, use Karney's Krüger method from module ktm, otherwise use the Ordnance Survey formulation (bool).
  • eps - Tolerance for OS convergence (meter).
  • LatLon_kwds - Optional, additional LatLon keyword arguments, ignored if LatLon is None.
Returns:
A LatLon instance or if LatLon is None a LatLonDatum3Tuple(lat, lon, datum).
Raises:
  • OSGRError - No convergence.
  • TypeError - If LatLon is not ellipsoidal or datum is invalid or conversion to datum failed.
Notes:
  • While OS grid references are based on the OSGB36 datum, the Ordnance Survey have deprecated the use of OSGB36 for lat-/longitude coordinates (in favour of WGS84). Hence, this method returns WGS84 by default with OSGB36 as an option, see.
  • The formulation implemented here due to Thomas, Redfearn, etc. is as published by the Ordnance Survey, but is inferior to Krüger as used by e.g. Karney 2011.

toRepr (self, GD=None, fmt='[%s]', sep=', ', **prec)

 

Return a string representation of this Osgr coordinate.

Arguments:
  • GD - If bool, in- or exclude the 2-letter grid designation and get the new prec behavior, otherwise if None, default to the DEPRECATED definition prec=5 for backward compatibility.
  • fmt - Enclosing backets format (str).
  • sep - Separator to join (str) or None to return an unjoined 2- or 3-tuple of strs.
  • prec - Precison prec=0, the number of decimal digits (int) or if negative, the number of units to drop, like MGRS PRECISION.
Returns:
This OSGR as (str), "[G:GD, E:meter, N:meter]" or if GD=False "[OSGR:easting,northing]" or GD=False and prec > 0 if "[OSGR:easting.d,northing.d]".
Raises:
  • OSGRError - If GD not in (None, True, False) or if prec < -4 and GD=False.
  • ValueError - Invalid prec.
Overrides: named._Named.toRepr

Note: OSGR easting and northing values are truncated, not rounded.

toStr (self, GD=None, sep='', **prec)

 

Return this Osgr coordinate as a string.

Arguments:
  • GD - If bool, in- or exclude the 2-letter grid designation and get the new prec behavior, otherwise if None, default to the DEPRECATED definition prec=5 for backward compatibility.
  • sep - Separator to join (str) or None to return an unjoined 2- or 3-tuple of strs.
  • prec - Precison prec=0, the number of decimal digits (int) or if negative, the number of units to drop, like MGRS PRECISION.
Returns:
This OSGR as (str), "GD meter meter" or if GD=False "easting,northing" or if GD=False and prec > 0 "easting.d,northing.d"
Raises:
  • OSGRError - If GD not in (None, True, False) or if prec < -4 and GD=False.
  • ValueError - Invalid prec.
Overrides: named._Named.toStr

Note: OSGR easting and northing values are truncated, not rounded.


Property Details

datum

Get the datum (Datum).

Get method:
datum(self) - Get the datum (Datum).
Set method:
_fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:
_fdel(inst) - Zap the cached/memoized property value.

easting

Get the easting (meter).

Get method:
easting(self) - Get the easting (meter).
Set method:
_fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:
_fdel(inst) - Zap the cached/memoized property value.

falsing0

Get the OS National Grid falsing (EasNor2Tuple).

Get method:
falsing0(self) - Get the OS National Grid falsing (EasNor2Tuple).
Set method:
_fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:
_fdel(inst) - Zap the cached/memoized property value.

iteration

Get the most recent Osgr.toLatLon iteration number (int) or None if not available/applicable.

Get method:
iteration(self) - Get the most recent Osgr.toLatLon iteration number (int) or None if not available/applicable.
Set method:
_fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:
_fdel(inst) - Zap the cached/memoized property value.

latlon0

Get the OS National Grid origin (LatLon2Tuple).

Get method:
latlon0(self) - Get the OS National Grid origin (LatLon2Tuple).
Set method:
_fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:
_fdel(inst) - Zap the cached/memoized property value.

northing

Get the northing (meter).

Get method:
northing(self) - Get the northing (meter).
Set method:
_fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:
_fdel(inst) - Zap the cached/memoized property value.

resolution

Get the OSGR resolution (meter, power of 10) or 0 if undefined.

Get method:
resolution(self) - Get the OSGR resolution (meter, power of 10) or 0 if undefined.
Set method:
_fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:
_fdel(inst) - Zap the cached/memoized property value.

scale0

Get the OS National Grid central scale (scalar).

Get method:
scale0(self) - Get the OS National Grid central scale (scalar).
Set method:
_fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:
_fdel(inst) - Zap the cached/memoized property value.

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