Colleted esri_wkt and esri_wkt parsing into one function which works, and added find() methods in each mod for easier name-to-obj parsing

pycrs/datums.py

@@ -1,4 +1,26 @@
 
+
+def find(datumname, crstype, strict=False):
+    if not strict:
+        datumname = datumname.lower()
+    for itemname,item in globals().items():
+        if itemname.startswith("_"):
+            continue
+        try:
+            if hasattr(item, crstype):
+                itemname = getattr(item, crstype)
+                if not strict:
+                    itemname = itemname.lower()
+                if datumname == itemname:
+                    return item
+        except:
+            pass
+    else:
+        return None
+
+    
+
+
 class WGS84:
     proj4 = "WGS84"
     ogc_wkt = "WGS_1984"
@@ -31,6 +53,14 @@ class NAD27:
     ellipsdef = "" # ellipsoids...
     to_wgs84 = None
 
+class SphereArcInfo:
+    proj4 = "" # no name
+    ogc_wkt = "D_Sphere_ARC_INFO" # confirmed but odd that uses D_
+    esri_wkt = "D_Sphere_ARC_INFO"
+
+    semimaj_ax = 6370997.0
+    inv_flat = 0.0
+
 class Unknown:
     proj4 = "unknown" # no datum name, just ellips + towgs84 params...
     ogc_wkt = "Unknown"

pycrs/ellipsoids.py

@@ -1,5 +1,27 @@
 
 
+def find(ellipsname, crstype, strict=False):
+    if not strict:
+        ellipsname = ellipsname.lower()
+    for itemname,item in globals().items():
+        if itemname.startswith("_"):
+            continue
+        try:
+            if hasattr(item, crstype):
+                itemname = getattr(item, crstype)
+                if not strict:
+                    itemname = itemname.lower()
+                if ellipsname == itemname:
+                    return item
+        except:
+            pass
+    else:
+        return None
+
+
+
+
+
 class WGS84:
     proj4 = "WGS84"
     ogc_wkt = "WGS_1984"
@@ -49,5 +71,20 @@ class Airy1830:
     semimaj_ax = 6377563.396
     inv_flat = 299.3249646
 
+class SphereArcInfo:
+    proj4 = "" # no name
+    ogc_wkt = "Sphere_ARC_INFO"
+    esri_wkt = "Sphere_ARC_INFO"
+
+    semimaj_ax = 6370997.0
+    inv_flat = 0.0
+
+
+
+
+
+
+
+
 
     

pycrs/parameters.py

@@ -22,22 +22,44 @@
 
 # +unit and +to_metre are what makes up 'UNIT["Meter",1.0]'
 
+from . import datums
 from . import directions
 
+################
 
-# ONLY PURE VALUES INSIDE ELLIPSOID...
+def find(paramname, crstype, strict=False):
+    if not strict:
+        paramname = paramname.lower()
+    for itemname,item in globals().items():
+        if itemname.startswith("_"):
+            continue
+        try:
+            if hasattr(item, crstype):
+                itemname = getattr(item, crstype)
+                if not strict:
+                    itemname = itemname.lower()
+                if paramname == itemname:
+                    return item
+        except:
+            pass
+    else:
+        return None
+    
 
-##+a         Semimajor radius of the ellipsoid axis
-class SemiMajorRadius:
-    proj4 = "+a"    
-    def __init__(self, value):
-        pass
+# NOT CURRENTLY USED, BUT SHOULD BE
+# FOR NOW ONLY SET AS PURE VALUES INSIDE ELLIPSOID...
 
-##+b         Semiminor radius of the ellipsoid axis
-class SemiMinorRadius:
-    proj4 = "+b"
-    def __init__(self, value):
-        pass
+####+a         Semimajor radius of the ellipsoid axis
+##class SemiMajorRadius:
+##    proj4 = "+a"    
+##    def __init__(self, value):
+##        pass
+##
+####+b         Semiminor radius of the ellipsoid axis
+##class SemiMinorRadius:
+##    proj4 = "+b"
+##    def __init__(self, value):
+##        pass
     
 
 
@@ -49,6 +71,7 @@ class Azimuth:
     esri_wkt = "azimuth"
     ogc_wkt = "azimuth"
     geotiff = "AzimuthAngle"
+    
     def __init__(self, value):
         self.value = value
 
@@ -59,10 +82,14 @@ class Azimuth:
         return 'PARAMETER["Azimuth",%s]' % self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()    
+        return 'PARAMETER["Azimuth",%s]' % self.value
     
 ##+datum     Datum name (see `proj -ld`)
 class Datum:
+    proj4 = "+datum"
+    ogc_wkt = "DATUM"
+    esri_wkt = "DATUM"
+    
     def __init__(self, name, ellipsoid, datumshift=None):
         """
         Arguments:
@@ -77,6 +104,8 @@ class Datum:
     def to_proj4(self):
         if self.datumshift:
             return "%s %s" % (self.ellips.to_proj4(), self.datumshift.to_proj4())
+        elif isinstance(self.name, datums.Unknown):
+            return "%s" % self.ellips.to_proj4()
         else:
             return "+datum=%s %s" % (self.name.proj4, self.ellips.to_proj4())
 
@@ -87,7 +116,10 @@ class Datum:
             return 'DATUM["%s", %s]' % (self.name.ogc_wkt, self.ellips.to_ogc_wkt())
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        if self.datumshift:
+            return 'DATUM["%s", %s, %s]' % (self.name.esri_wkt, self.ellips.to_esri_wkt(), self.datumshift.to_esri_wkt())
+        else:
+            return 'DATUM["%s", %s]' % (self.name.esri_wkt, self.ellips.to_esri_wkt())
 
     def to_geotiff(self):
         pass
@@ -95,6 +127,10 @@ class Datum:
     
 ##+ellps     Ellipsoid name (see `proj -le`)
 class Ellipsoid:
+    proj4 = "+ellps"
+    ogc_wkt = "SPHEROID"
+    esri_wkt = "SPHEROID"
+
     def __init__(self, name, semimaj_ax=None, inv_flat=None):
         """
         Arguments:
@@ -119,7 +155,7 @@ class Ellipsoid:
         return 'SPHEROID["%s", %s, %s]' % (self.name.ogc_wkt, self.semimaj_ax, self.inv_flat)
     
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'SPHEROID["%s", %s, %s]' % (self.name.esri_wkt, self.semimaj_ax, self.inv_flat)
 
     def to_geotiff(self):
         pass
@@ -127,6 +163,9 @@ class Ellipsoid:
 
 #GEOGCS
 class GeogCS:
+    ogc_wkt = "GEOGCS"
+    esri_wkt = "GEOGCS"
+
     def __init__(self, name, datum, prime_mer, angunit, twin_ax=None):
         """
         Arguments:
@@ -143,16 +182,20 @@ class GeogCS:
         self.twin_ax = twin_ax
 
     def to_proj4(self):
-        return "%s %s %s" % (self.datum.to_proj4(), self.prime_mer.to_proj4(), self.angunit.to_proj4() ) #+axis= AND #, self.twin_ax[0].proj4, self.twin_ax[1].proj4 )
+        # dont parse axis to proj4, because in proj4, axis only applies to the cs, ie the projcs (not the geogcs, where wkt can specify with axis)
+        return "%s %s %s" % (self.datum.to_proj4(), self.prime_mer.to_proj4(), self.angunit.to_proj4() ) 
 
     def to_ogc_wkt(self):
         return 'GEOGCS["%s", %s, %s, %s, AXIS["Lon", %s], AXIS["Lat", %s]]' % (self.name, self.datum.to_ogc_wkt(), self.prime_mer.to_ogc_wkt(), self.angunit.to_ogc_wkt(), self.twin_ax[0].ogc_wkt, self.twin_ax[1].ogc_wkt )
     
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'GEOGCS["%s", %s, %s, %s, AXIS["Lon", %s], AXIS["Lat", %s]]' % (self.name, self.datum.to_esri_wkt(), self.prime_mer.to_esri_wkt(), self.angunit.to_esri_wkt(), self.twin_ax[0].esri_wkt, self.twin_ax[1].esri_wkt )
 
 #PROJCS
 class ProjCS:
+    ogc_wkt = "PROJCS"
+    esri_wkt = "PROJCS"
+    
     def __init__(self, name, geogcs, proj, params, unit, twin_ax=None):
         """
         Arguments:
@@ -173,7 +216,6 @@ class ProjCS:
         string = "%s %s " % (self.proj.to_proj4(), self.geogcs.to_proj4())
         string += " ".join(param.to_proj4() for param in self.params)
         string += " %s" % self.unit.to_proj4()
-        # in proj4, axis only applies to the cs, ie the projcs (not the geogcs, where wkt can specify with axis)
         string += " +axis=" + self.twin_ax[0].proj4 + self.twin_ax[1].proj4 + "u" # up set as default because only proj4 can set it I think...
         return string
 
@@ -185,11 +227,18 @@ class ProjCS:
         return string
     
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        string = 'PROJCS["%s", %s, %s, ' % (self.name, self.geogcs.to_esri_wkt(), self.proj.to_esri_wkt() )
+        string += ", ".join(param.to_esri_wkt() for param in self.params)
+        string += ', %s' % self.unit.to_esri_wkt()
+        string += ', AXIS["X", %s], AXIS["Y", %s]]' % (self.twin_ax[0].esri_wkt, self.twin_ax[1].esri_wkt )
+        return string
 
 ##+k         Scaling factor (old name)
 ##+k_0       Scaling factor (new name)
 class ScalingFactor:
+    proj4 = "+k"
+    ogc_wkt = "scale_factor"
+    
     def __init__(self, value):
         self.value = value
 
@@ -200,6 +249,7 @@ class ScalingFactor:
         return 'PARAMETER["scale_factor", %s]' %self.value
 
     def to_esri_wkt(self):
+        # REALLY??
         raise Exception("Paramater not supported by ESRI WKT")
 
     def to_geotiff(self):
@@ -208,6 +258,10 @@ class ScalingFactor:
 
 ##+lat_0     Latitude of origin
 class LatitudeOrigin:
+    proj4 = "+lat_0"
+    ogc_wkt = "latitude_of_origin"
+    esri_wkt = "Latitude_Of_Origin"
+    
     def __init__(self, value):
         self.value = value
 
@@ -219,7 +273,7 @@ class LatitudeOrigin:
         return 'PARAMETER["latitude_of_origin", %s]' %self.value
 
     def to_esri_wkt(self):
-        raise Exception("Paramater not supported by ESRI WKT")
+        return 'PARAMETER["Latitude_Of_Origin", %s]' %self.value
 
     def to_geotiff(self):
         pass
@@ -227,6 +281,10 @@ class LatitudeOrigin:
     
 ##+lat_1     Latitude of first standard parallel
 class LatitudeFirstStndParallel:
+    proj4 = "+lat_1"
+    ogc_wkt = "standard_parallel_1"
+    esri_wkt = "Standard_Parallel_1"
+    
     def __init__(self, value):
         self.value = value
         
@@ -237,7 +295,7 @@ class LatitudeFirstStndParallel:
         return 'PARAMETER["standard_parallel_1", %s]' %self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PARAMETER["Standard_Parallel_1", %s]' %self.value
 
     def to_geotiff(self):
         pass
@@ -245,6 +303,10 @@ class LatitudeFirstStndParallel:
     
 ##+lat_2     Latitude of second standard parallel
 class LatitudeSecondStndParallel:
+    proj4 = "+lat_2"
+    ogc_wkt = "standard_parallel_2"
+    esri_wkt = "Standard_Parallel_2"
+    
     def __init__(self, value):
         self.value = value
     
@@ -255,7 +317,7 @@ class LatitudeSecondStndParallel:
         return 'PARAMETER["standard_parallel_2", %s]' %self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PARAMETER["Standard_Parallel_2", %s]' %self.value
 
     def to_geotiff(self):
         pass
@@ -263,6 +325,10 @@ class LatitudeSecondStndParallel:
     
 ##+lat_ts    Latitude of true scale
 class LatitudeTrueScale:
+    proj4 = "lat_ts"
+    ogc_wkt = "Standard_Parallel_1"
+    esri_wkt = "Standard_Parallel_1"
+    
     def __init__(self, value):
         self.value = value
 
@@ -273,7 +339,7 @@ class LatitudeTrueScale:
         return 'PARAMETER["Standard_Parallel_1", %s]' %self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PARAMETER["Standard_Parallel_1", %s]' %self.value
 
     def to_geotiff(self):
         pass
@@ -281,6 +347,10 @@ class LatitudeTrueScale:
     
 ##+lon_0     Central meridian
 class CentralMeridian:
+    proj4 = "+lon_0"
+    ogc_wkt = "Central_Meridian"
+    esri_wkt = "Central_Meridian"
+    
     def __init__(self, value):
         self.value = value
 
@@ -291,7 +361,7 @@ class CentralMeridian:
         return 'PARAMETER["Central_Meridian", %s]' %self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PARAMETER["Central_Meridian", %s]' %self.value
 
     def to_geotiff(self):
         pass
@@ -300,6 +370,9 @@ class CentralMeridian:
 ##+lonc      ? Longitude used with Oblique Mercator and possibly a few others
 class LongitudeCenter:
     proj4 = "+lonc"
+    ogc_wkt = "Longitude_Of_Center"
+    esri_wkt = "Longitude_Of_Center"
+    
     def __init__(self, value):
         self.value = value
 
@@ -310,7 +383,7 @@ class LongitudeCenter:
         return 'PARAMETER["Longitude_Of_Center", %s]' %self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PARAMETER["Longitude_Of_Center", %s]' %self.value
     
 ##+lon_wrap  Center longitude to use for wrapping (see below)
     
@@ -318,6 +391,10 @@ class LongitudeCenter:
 
 ##+pm        Alternate prime meridian (typically a city name, see below)
 class PrimeMeridian:
+    proj4 = "+pm"
+    ogc_wkt = "PRIMEM"
+    esri_wkt = "PRIMEM"
+    
     def __init__(self, value):
         """
         Arguments:
@@ -333,10 +410,14 @@ class PrimeMeridian:
         return 'PRIMEM["Greenwich", %s]' %self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PRIMEM["Greenwich", %s]' %self.value
 
 ##+proj      Projection name (see `proj -l`)
 class Projection:
+    proj4 = "+proj"
+    ogc_wkt = "PROJECTION"
+    esri_wkt = "PROJECTION"
+    
     def __init__(self, value):
         self.value = value
 
@@ -347,7 +428,7 @@ class Projection:
         return 'PROJECTION["%s"]' %self.value.ogc_wkt
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PROJECTION["%s"]' %self.value.esri_wkt
 
 ##+zone     UTM zone
     
@@ -355,6 +436,9 @@ class Projection:
     
 ##+towgs84   3 or 7 term datum transform parameters (see below)
 class DatumShift:
+    proj4 = "+towgs84"
+    ogc_wkt = "TOWGS84"
+    
     def __init__(self, value):
         self.value = value
 
@@ -369,6 +453,8 @@ class DatumShift:
     
 ##+to_meter  Multiplier to convert map units to 1.0m
 class MeterMultiplier:
+    proj4 = "+to_meter"
+    
     def __init__(self, value):
         self.value = value
 
@@ -380,10 +466,12 @@ class MeterMultiplier:
         return bytes(self.value)
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return bytes(self.value)
 
 ##+units     meters, US survey feet, etc.
 class UnitType:
+    proj4 = "+units"
+    
     def __init__(self, value):
         """
         Arguments:
@@ -400,10 +488,13 @@ class UnitType:
         return bytes(self.value.ogc_wkt)
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return bytes(self.value.esri_wkt)
 
 # special...
 class Unit:
+    ogc_wkt = "UNIT"
+    esri_wkt = "UNIT"
+    
     def __init__(self, unittype, metermultiplier):
         self.unittype = unittype
         self.metermultiplier = metermultiplier
@@ -415,10 +506,13 @@ class Unit:
         return 'UNIT["%s", %s]' %(self.unittype.to_ogc_wkt(), self.metermultiplier.to_ogc_wkt())
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'UNIT["%s", %s]' %(self.unittype.to_esri_wkt(), self.metermultiplier.to_esri_wkt())
 
 # angular unit
 class AngularUnit:
+    ogc_wkt = "UNIT"
+    esri_wkt = "UNIT"
+    
     def __init__(self, unittype, metermultiplier):
         self.unittype = unittype
         self.metermultiplier = metermultiplier
@@ -431,7 +525,7 @@ class AngularUnit:
         return 'UNIT["%s", %s]' %(self.unittype.to_ogc_wkt(), self.metermultiplier.to_ogc_wkt())
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'UNIT["%s", %s]' %(self.unittype.to_esri_wkt(), self.metermultiplier.to_esri_wkt())
     
 ##+x_0       False easting
 class FalseEasting:
@@ -450,7 +544,7 @@ class FalseEasting:
         return 'PARAMETER["false_easting", %s]' % self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PARAMETER["False_Easting", %s]' % self.value
     
 ##+y_0       False northing
 class FalseNorthing:
@@ -469,10 +563,14 @@ class FalseNorthing:
         return 'PARAMETER["false_northing", %s]' % self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PARAMETER["False_Northing", %s]' % self.value
 
 ##+h       Satellite height
 class SatelliteHeight:
+    proj4 = "+h"
+    ogc_wkt = "satellite_height"
+    esri_wkt = "satellite_height"
+    
     def __init__(self, value):
         self.value = value
 
@@ -483,10 +581,12 @@ class SatelliteHeight:
         return 'PARAMETER["satellite_height", %s]' % self.value
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return 'PARAMETER["satellite_height", %s]' % self.value
 
 ##+tilt     Tilt angle
 class TiltAngle:
+    proj4 = "+tilt"
+    
     def __init__(self, value):
         self.value = value
 
@@ -494,10 +594,10 @@ class TiltAngle:
         return "+tilt=%s" %self.value
 
     def to_ogc_wkt(self):
-        raise Exception("Paramater not supported by OGC WKT")
+        raise Exception("Parameter not supported by OGC WKT")
 
     def to_esri_wkt(self):
-        raise Exception("Paramater not supported by ESRI WKT")
+        raise Exception("Parameter not supported by ESRI WKT")
 
     
 # then the final CRS object which is instantiated with all of these?
@@ -508,12 +608,15 @@ class CRS:
         self.toplevel = toplevel
         
     def to_proj4(self):
-        return "%s +no_defs" % self.toplevel.to_proj4()
+        if isinstance(self.toplevel, ProjCS):
+            return "%s +no_defs" % self.toplevel.to_proj4()
+        elif isinstance(self.toplevel, GeogCS):
+            return "+proj=longlat %s +no_defs" % self.toplevel.to_proj4()
 
     def to_ogc_wkt(self):
         return "%s" % self.toplevel.to_ogc_wkt()
 
     def to_esri_wkt(self):
-        return self.to_ogc_wkt()
+        return "%s" % self.toplevel.to_esri_wkt()
 
 

pycrs/projections.py

@@ -1,20 +1,46 @@
 
 
+def find(projname, crstype, strict=False):
+    if not strict:
+        projname = projname.lower()
+    for itemname,item in globals().items():
+        if itemname.startswith("_"):
+            continue
+        try:
+            if hasattr(item, crstype):
+                itemname = getattr(item, crstype)
+                if not strict:
+                    itemname = itemname.lower()
+                if projname == itemname:
+                    return item
+        except:
+            pass
+    else:
+        return None
+
+
+
+    
+
 class Robinson:
     proj4 = "robin"
     ogc_wkt = "Robinson"
+    esri_wkt = "Robinson"
 
 class UTM:
     proj4 = "utm"
     ogc_wkt = "Transverse_Mercator"
+    esri_wkt = "Transverse_Mercator"
 
 class ObliqueMercator:
     proj4 = "omerc"
     ogc_wkt = "Hotine_Oblique_Mercator"
+    esri_wkt = "Hotine_Oblique_Mercator_Azimuth_Natural_Origin"
     
 class AlbersEqualArea:
     proj4 = "aea"
-    ogc_wkt = "Albers"
+    ogc_wkt = "Albers_Conic_Equal_Area"
+    esri_wkt = "Albers"
 
 class CylindricalEqualArea:
     proj4 = "cea"
@@ -24,90 +50,112 @@ class CylindricalEqualArea:
 class EquiDistantConic:
     proj4 = "eqdc"
     ogc_wkt = "Equidistant_Conic"
+    esri_wkt = "Equidistant_Conic"
 
 class TransverseMercator:
     proj4 = "tmerc"
     ogc_wkt = "Transverse_Mercator"
+    esri_wkt = "Transverse_Mercator"
 
 class GallStereographic:
     proj4 = "gall"
     ogc_wkt = "Gall_Stereographic"
+    esri_wkt = "Gall_Stereographic"
 
 class Gnomonic:
     proj4 = "gnom"
     ogc_wkt = "Gnomonic"
+    esri_wkt = "Gnomonic"
 
 class LambertAzimuthalEqualArea:
     proj4 = "laea"
     ogc_wkt = "Lambert_Azimuthal_Equal_Area"
+    esri_wkt = "Lambert_Azimuthal_Equal_Area"
 
 class MillerCylindrical:
     proj4 = "mill"
     ogc_wkt = "Miller_Cylindrical"
+    esri_wkt = "Miller_Cylindrical"
 
 class Mollweide:
     proj4 = "moll"
     ogc_wkt = "Mollweide"
+    esri_wkt = "Mollweide"
 
 class ObliqueStereographic:
     proj4 = "sterea"
     ogc_wkt = "Oblique_Stereographic"
+    esri_wkt = "Stereographic_North_Pole"
 
 class Orthographic:
     proj4 = "ortho"
     ogc_wkt = "Orthographic"
+    esri_wkt = "Orthographic"
 
 class PolarStereographic:
     proj4 = "stere"
-    ogc_wkt = "Polar_Stereographic"
+    ogc_wkt = "Polar_Stereographic" # could also be just stereographic
+    esri_wkt = "Stereographic" # but also spelled with additional _South/North_Pole, for the same projection and diff params (maybe just for humans)?...
 
 class Sinusoidal:
     proj4 = "sinu"
     ogc_wkt = "Sinusoidal"
+    esri_wkt = "Sinusoidal"
 
 class VanDerGrinten:
     proj4 = "vandg"
     ogc_wkt = "VanDerGrinten"
+    esri_wkt = "Van_der_Grinten_I"
 
 class Equirectangular:
     proj4 = "eqc"
     ogc_wkt = "Equirectangular"
+    esri_wkt = "Equidistant_Cylindrical"
 
 class LambertConformalConic:
     proj4 = "lcc"
-    ogc_wkt = "Lambert_Conformal_Conic"
+    ogc_wkt = "Lambert_Conformal_Conic" # possible has some variants
+    esri_wkt = "Lambert_Conformal_Conic"
 
 class Krovak:
     proj4 = "krovak"
     ogc_wkt = "Krovak"
+    esri_wkt = "Krovak"
 
 class NearSidedPerspective:
     proj4 = "nsper"
     ogc_wkt = "Near_sided_perspective"
+    esri_wkt = "Near_sided_perspective" # not confirmed
 
 class TiltedPerspective:
     proj4 = "tsper"
     ogc_wkt = "Tilted_perspective"
+    esri_wkt = "Tilted_perspective" # not confirmed
 
 class InteruptedGoodeHomolosine:
     proj4 = "igh"
     ogc_wkt = "Interrupted_Goodes_Homolosine"
+    esri_wkt = "Interrupted_Goodes_Homolosine"
 
 class Larrivee:
     proj4 = "larr"
     ogc_wkt = "Larrivee"
+    esri_wkt = "Larrivee" # not confirmed
 
 class LamberEqualAreaConic:
     proj4 = "leac"
     ogc_wkt = "Lambert_Equal_Area_Conic"
+    esri_wkt = "Lambert_Equal_Area_Conic" # not confirmed
 
 class Mercator:
     proj4 = "merc"
-    ogc_wkt = "Mercator"
+    ogc_wkt = "Mercator" # has multiple varieties
+    esri_wkt = "Mercator"
 
 class ObliqueCylindricalEqualArea:
     proj4 = "ocea"
     ogc_wkt = "Oblique_Cylindrical_Equal_Area"
+    esri_wkt = "Oblique_Cylindrical_Equal_Area"
 
         
 

pycrs/units.py

@@ -1,5 +1,30 @@
 
 
+def find(unitname, crstype, strict=False):
+    if not strict:
+        unitname = unitname.lower()
+    for itemname,item in globals().items():
+        if itemname.startswith("_"):
+            continue
+        try:
+            if hasattr(item, crstype):
+                itemname = getattr(item, crstype)
+                # compare
+                if not strict:
+                    itemname = itemname.lower()
+                if unitname == itemname:
+                    return item
+                # special handling of wkt meters which has multiple possibilities
+                elif isinstance(itemname, Meter) and crstype.endswith("wkt") and not strict and unitname in ("meters","meter","metre"):
+                    return item
+        except:
+            pass
+    else:
+        return None
+
+
+
+
 class Meter:
     proj4 = "m"
     ogc_wkt = "Meters" # or is it metre?? sometimes even Meter?

tester.py

@@ -12,16 +12,15 @@ def render_world(crs):
     import pyagg
     import pyproj
     import random
-    c = pyagg.Canvas(600,600)
-    c.geographic_space()
+
+    # load world borders
     raw = urllib2.urlopen("https://raw.githubusercontent.com/johan/world.geo.json/master/countries.geo.json").read()
     rawdict = json.loads(raw)
     data = pygeoj.load(data=rawdict)
-    proj4 = crs.to_proj4()
-    fromproj = pyproj.Proj("+init=EPSG:4326")
-    toproj = pyproj.Proj(proj4)
 
-    print data.bbox
+    # convert coordinates
+    fromproj = pyproj.Proj("+init=EPSG:4326")
+    toproj = pyproj.Proj(crs.to_proj4())
     for feat in data:
         if feat.geometry.type == "Polygon":
             feat.geometry.coordinates = [zip(*pyproj.transform(fromproj, toproj, zip(*ring)[0], zip(*ring)[1]))
@@ -31,19 +30,33 @@ def render_world(crs):
                                         [zip(*pyproj.transform(fromproj, toproj, zip(*ring)[0], zip(*ring)[1]))
                                          for ring in poly]
                                          for poly in feat.geometry.coordinates]
+    # get zoom area
+    # NOTE: PYGEOJ data.bbox doesnt update.........FIX!
     data.add_all_bboxes()
-    xmins, ymins, xmaxs, ymaxs = zip(*(feat.geometry.bbox for feat in data))
-    bbox = (min(xmins), min(ymins), max(xmaxs), max(ymaxs))#33333, 33333) # to avoid inf bounds and no render
-    # print data.bbox #PYGEOJ data.bbox doesnt update.........FIX!
-    print bbox
+    data.update_bbox()
+    bbox = data.bbox
+
+##    # to avoid inf bounds and no render in satellite view
+##    xmins, ymins, xmaxs, ymaxs = zip(*(feat.geometry.bbox for feat in data))
+##    inf = float("inf") 
+##    xmaxs = (xmax for xmax in xmaxs if xmax != inf)
+##    ymaxs = (ymax for ymax in ymaxs if ymax != inf)
+##    bbox = (min(xmins), min(ymins), max(xmaxs), max(ymaxs)) 
+
+    # set up drawing
+    c = pyagg.Canvas(600,600)
+    c.geographic_space()
     c.zoom_bbox(*bbox)
+    c.zoom_out(1.3)
+
+    # draw
     for feat in data:
         try: c.draw_geojson(feat.geometry,
                             fillcolor=tuple(random.randrange(255) for _ in range(3)),
                             outlinecolor="white")
         except:
             # NOTE: feat.__geo_interface__ is one level too high maybe??
-            print feat.geometry
+            print("unable to draw?", feat.geometry)
     c.view()
 
 
@@ -53,27 +66,41 @@ def render_world(crs):
 
 ###########################
 # OGC WKT
-print "testing ogc wkt"
-crs = pycrs.parser.from_sr_code(54030)
+print("--------")
+print("testing ogc wkt")
+print("")
+#crs = pycrs.parser.from_sr_code(54030)
 #crs = pycrs.parser.from_sr_code(22)
-print crs.to_proj4()
+#crs = pycrs.parser.from_esri_code(54031)
+crs = pycrs.parser.from_sr_code(6978)
 wkt = crs.to_ogc_wkt()
-print "Original:", wkt
-print "Reconstructed:", pycrs.parser.from_ogc_wkt(wkt).to_ogc_wkt()
 
-render_world(crs)
+print("Original:", wkt)
+print("")
+
+crs = pycrs.parser.from_ogc_wkt(wkt)
+
+print("Reconstructed:", crs.to_ogc_wkt())
+print("")
+
+#render_world(crs)
 
 
 
 
 ###########################
 # PROJ4
-print "testing proj4"
-#proj4 = "+proj=robin +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
+print("--------")
+print("testing proj4")
+print("")
+proj4 = "+proj=robin +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
 #proj4 = "+proj=longlat +ellps=WGS84 +datum=WGS84"
 #proj4 = "+proj=aea +lat_1=24 +lat_2=31.5 +lat_0=24 +lon_0=-84 +x_0=400000 +y_0=0 +ellps=GRS80 +units=m +no_defs "
-proj4 = "+proj=larr +datum=WGS84 +lon_0=0 +lat_ts=45 +x_0=0 +y_0=0 +ellps=WGS84 +units=m +no_defs"
-#proj4 = "+proj=nsper +datum=WGS84 +ellps=WGS84 +lon_0=44 +lat_0=30 +h=200000000"
+#proj4 = "+proj=larr +datum=WGS84 +lon_0=0 +lat_ts=45 +x_0=0 +y_0=0 +ellps=WGS84 +units=m +no_defs"
+#proj4 = "+proj=nsper +datum=WGS84 +ellps=WGS84 +lon_0=-60 +lat_0=40 +h=2000000000000000000000000"
+
+print("Original:", proj4)
+print("")
 
 #crs = pycrs.parser.from_esri_code(54030)
 #crs = pycrs.parser.from_sr_code(7898)
@@ -82,17 +109,31 @@ proj4 = "+proj=larr +datum=WGS84 +lon_0=0 +lat_ts=45 +x_0=0 +y_0=0 +ellps=WGS84
 crs = pycrs.parser.from_proj4(proj4)
 #crs = pycrs.parser.from_ogc_wkt(wkt)
 
-print crs.to_proj4()
+print("Reconstructed:", crs.to_proj4())
+print("")
 
-render_world(crs)
+#render_world(crs)
 
 
 
 
 ###########################
-# PRJ FILE
+# ESRI WKT/PRJ FILE
+print("--------")
+print("testing esri prj file")
+print("")
 crs = pycrs.loader.from_file("testfiles/natearth.prj")
-print crs
+wkt = crs.to_esri_wkt()
+
+print("Original:", wkt)
+print("")
+
+crs = pycrs.parser.from_esri_wkt(wkt)
+
+print("Reconstructed:", crs.to_esri_wkt())
+print("")
+
+#render_world(crs)