mirror of
https://github.com/wassname/PyCRS.git
synced 2026-06-27 16:10:29 +08:00
Karim Bahgat
306 lines
7.7 KiB
Python
306 lines
7.7 KiB
Python
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#################
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# CRS CLASSES
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#################
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# first classes for each crs element, from the proj4 common paramter listing
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# https://trac.osgeo.org/proj/wiki/GenParms
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# note also that in wkt the names of "PROJECTION", "DATUM", and "SPHEROID"
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# matter and seem to be interpreted and computed upon, ie they carry meaning
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# that is commonly understood by programs, so is not explicit in the crs specification.
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# the paramters below simply modify certain aspects of the proj/datum/spheroids
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# note that the names in wkt of "PROJCS" and "GEOGCS" seem to be purely
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# for identifying and branding and can be changed at will.
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# they do however act as shortcuts, so that proj4 can use +init=... to load
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# everything automatically
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# some of these names imply certain combinations of datum and spheroid and paramters.
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# so in proj4 one simply needs to give that name, but in wkt one needs to spell it all out.
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# +unit and +to_metre are what makes up 'UNIT["Meter",1.0]'
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##+a Semimajor radius of the ellipsoid axis
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class SemiMajorRadius:
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proj4 = "+a"
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def __init__(self, value):
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pass
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##+alpha ? Used with Oblique Mercator and possibly a few others
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class Azimuth:
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proj4 = "+alpha"
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esri_wkt = "azimuth"
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ogc_wkt = "azimuth"
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geotiff = "AzimuthAngle"
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def __init__(self, value):
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pass
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##+axis Axis orientation (new in 4.8.0)
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class AxisOrientation:
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proj4 = "+axis"
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esri_wkt = None
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ogc_wkt = "AXIS"
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geotiff = None
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def __init__(self, value):
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pass
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##+b Semiminor radius of the ellipsoid axis
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class SemiMinorRadius:
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proj4 = "+b"
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def __init__(self, value):
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pass
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##+datum Datum name (see `proj -ld`)
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class DatumName:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+datum=%s" %self.value
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def to_ogc_wkt(self):
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return 'DATUM[%s]' %self.value
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def to_esri_wkt(self):
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return self.to_ogc_wkt()
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def to_geotiff(self):
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pass
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#return "GeogGeodeticDatum"
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##+ellps Ellipsoid name (see `proj -le`)
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class EllipsoidName:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+ellps=%s" %self.value
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def to_ogc_wkt(self):
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return 'SPHEROID[%s]' %self.value
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def to_esri_wkt(self):
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return self.to_ogc_wkt()
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def to_geotiff(self):
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pass
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#return "GeogEllipsoid"
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##+k Scaling factor (old name)
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##+k_0 Scaling factor (new name)
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class ScalingFactor:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+k_0=%s" %self.value
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def to_ogc_wkt(self):
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return 'PARAMETER["scale_factor", %s]' %self.value
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def to_esri_wkt(self):
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raise Exception("Paramater not supported by ESRI WKT")
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def to_geotiff(self):
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pass
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#return "ScaleAtNatOrigin" # or ScaleAtCenter?
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##+lat_0 Latitude of origin
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class LatitudeOrigin:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+lat_0=%s" %self.value
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def to_ogc_wkt(self):
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return 'PARAMETER["latitude_of_origin", %s]' %self.value
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def to_esri_wkt(self):
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raise Exception("Paramater not supported by ESRI WKT")
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def to_geotiff(self):
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pass
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#return "ProjCenterLat"
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##+lat_1 Latitude of first standard parallel
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class LatitudeFirstStndParallel:
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proj4 = "+lat_1"
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def __init__(self, value):
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pass
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##+lat_2 Latitude of second standard parallel
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class LatitudeSecondStndParallel:
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proj4 = "+lat_2"
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def __init__(self, value):
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pass
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##+lat_ts Latitude of true scale
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class LatitudeTrueScale:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+lat_ts=%s" %self.value
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def to_ogc_wkt(self):
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return 'PARAMETER["Standard_Parallel_1", %s]' %self.value
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def to_esri_wkt(self):
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return self.to_ogc_wkt()
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def to_geotiff(self):
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pass
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#return "ProjStdParallel1"
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##+lon_0 Central meridian
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class CentralMeridian:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+lon_0=%s" %self.value
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def to_ogc_wkt(self):
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return 'PARAMETER["Central_Meridian", %s]' %self.value
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def to_esri_wkt(self):
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return self.to_ogc_wkt()
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def to_geotiff(self):
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pass
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#return "ProjCenterLong"
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##+lonc ? Longitude used with Oblique Mercator and possibly a few others
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class LongitudeSpecial:
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proj4 = "+lonc"
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def __init__(self, value):
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pass
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##+lon_wrap Center longitude to use for wrapping (see below)
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##+over Allow longitude output outside -180 to 180 range, disables wrapping (see below)
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##+pm Alternate prime meridian (typically a city name, see below)
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class PrimeMeridian:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+pm=%s" %self.value
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def to_ogc_wkt(self):
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return 'PRIMEM["Greenwich", %s]' %self.value
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def to_esri_wkt(self):
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return self.to_ogc_wkt()
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##+proj Projection name (see `proj -l`)
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class ProjectionName:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+proj=%s" %self.value
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def to_ogc_wkt(self):
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return 'PROJECTION["%s"]' %self.value
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def to_esri_wkt(self):
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return self.to_ogc_wkt()
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##+south Denotes southern hemisphere UTM zone
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##+towgs84 3 or 7 term datum transform parameters (see below)
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class DatumShift:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+towgs84=%s" %"".join((str(val) for val in self.value))
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def to_ogc_wkt(self):
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return "TOWGS84[%s]" %"".join((str(val) for val in self.value))
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def to_esri_wkt(self):
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raise Exception("Paramater not supported by ESRI WKT")
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##+to_meter Multiplier to convert map units to 1.0m
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class MeterMultiplier:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+to_meter=%s" %self.value
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def to_ogc_wkt(self):
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# the stuff that comes after UNITS["meter", ... # must be combined with unittype in a unit class to make wkt
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return str(self.value)
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def to_esri_wkt(self):
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return self.to_ogc_wkt()
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##+units meters, US survey feet, etc.
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class UnitType:
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def __init__(self, value):
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self.value = value
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def to_proj4(self):
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return "+units=%s" %self.value
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def to_ogc_wkt(self):
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# the stuff that comes after UNITS[... # must be combined with metermultiplier in a unit class to make wkt
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return str(self.value)
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def to_esri_wkt(self):
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return self.to_ogc_wkt()
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# special...
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class Unit:
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def __init__(self, unittype, metermultiplier):
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self.unittype = unittype
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self.metermultiplier = metermultiplier
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def to_proj4(self):
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return "+%s +%s" %(self.unittype, self.metermultiplier)
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def to_ogc_wkt(self):
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return 'UNIT["%s", %s]' %(self.unittype.to_ogc_wkt(), self.metermultiplier.to_ogc_wkt())
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def to_esri_wkt(self):
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return self.to_ogc_wkt()
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##+x_0 False easting
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class FalseEasting:
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proj4 = "+x_0"
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esri_wkt = "False_Easting"
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ogc_wkt = "false_easting"
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geotiff = "FalseEasting"
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def __init__(self, value):
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pass
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##+y_0 False northing
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class FalseEasting:
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proj4 = "+y_0"
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esri_wkt = "False_Northing"
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ogc_wkt = "false_northing"
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geotiff = "FalseNorthing"
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def __init__(self, value):
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pass
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# then the final CRS object which is instantiated with all of these?
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# remember to use +no_defs when outputting to proj4
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# ...
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