mirror of
https://github.com/wassname/PyCRS.git
synced 2026-07-16 01:20:27 +08:00
Added almost all params, made front API usable, and added crs transform draw testing.
Next step figure out more stable proj4 parsing of datums and proj etc, with adding more specific names. Then consistently make to_esriwkt work.
This commit is contained in:
Karim Bahgat
+167
-83
@@ -9,59 +9,59 @@ from . import ellipsoids
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from . import parameters
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from . import units
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from . import projections
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from . import webscrape
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def from_epsg_code(string):
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def from_epsg_code(code):
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# must go online (or look up local table) to get crs details
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pass
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code = str(code)
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proj4 = webscrape.crscode_to_string("epsg", code, "proj4")
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crs = from_proj4(proj4)
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return crs
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def from_esri_code(string):
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def from_esri_code(code):
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# must go online (or look up local table) to get crs details
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pass
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code = str(code)
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proj4 = webscrape.crscode_to_string("esri", code, "proj4")
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crs = from_proj4(proj4)
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return crs
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def from_sr_code(string):
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def from_sr_code(code):
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# must go online (or look up local table) to get crs details
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pass
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code = str(code)
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proj4 = webscrape.crscode_to_string("sr-org", code, "proj4")
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crs = from_proj4(proj4)
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return crs
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def from_esri_wkt(string):
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# parse arguments into components
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# use args to create crs
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pass
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def from_ogc_wkt(string):
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# parse arguments into components
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# use args to create crs
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pass
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def from_unknown_wkt(string):
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# detect if ogc wkt or esri wkt
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# TIPS: esri wkt datums all use "D_" before the datum name
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# then load with appropriate function
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pass
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##def from_esri_wkt(string):
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## # parse arguments into components
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## # use args to create crs
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## pass
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##
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##def from_ogc_wkt(string):
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## # parse arguments into components
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## # use args to create crs
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## pass
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##
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##def from_unknown_wkt(string):
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## # detect if ogc wkt or esri wkt
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## # TIPS: esri wkt datums all use "D_" before the datum name
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## # then load with appropriate function
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## pass
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def from_proj4(string):
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# parse arguments into components
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# use args to create crs
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## proj=robin +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs
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##
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## PROJCS["World_Robinson",
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## GEOGCS["GCS_WGS_1984",
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## DATUM["WGS_1984",
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## SPHEROID["WGS_1984",6378137,298.257223563]],
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## PRIMEM["Greenwich",0],
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## UNIT["Degree",0.017453292519943295]],
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## PROJECTION["Robinson"],
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## PARAMETER["False_Easting",0],
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## PARAMETER["False_Northing",0],
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## PARAMETER["Central_Meridian",0],
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## UNIT["Meter",1],
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## AUTHORITY["EPSG","54030"]]
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# SLIGTHLY MESSY STILL, CLEANUP..
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params = []
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partdict = dict([part.split("=") for part in string.split()
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if not part.startswith("+no_defs")])
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# INIT CODES...?
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# eg, +init=epsg code...?
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# DATUM
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# datum param is required
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@@ -71,26 +71,58 @@ def from_proj4(string):
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if partdict["+datum"] == "WGS84":
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datumdef = datums.WGS84()
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# ELLIPS
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# ellipse param is required
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if "+ellps" in partdict:
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# get predefined ellips def
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if partdict["+ellps"] == "WGS84":
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ellipsdef = ellipsoids.WGS84()
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elif partdict["+datum"] == "NAD83":
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datumdef = datums.NAD83()
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else:
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raise Exception("Could not find required +ellps element")
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## create datum and ellips param objs
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ellips = parameters.Ellipsoid(ellipsdef,
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semimaj_ax=partdict.get("+a"),
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inv_flat=partdict.get("+f"))
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datum = parameters.Datum(datumdef, ellips)
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datumdef = datums.Unknown()
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else:
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raise Exception("Could not find required +datum element")
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datumdef = datums.Unknown()
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# ELLIPS
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# ellipse param is required
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if "+ellps" in partdict:
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# get predefined ellips def
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if partdict["+ellps"] == "WGS84":
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ellipsdef = ellipsoids.WGS84()
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elif partdict["+ellps"] == "WGS72":
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ellipsdef = ellipsoids.WGS72()
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elif partdict["+ellps"] == "intl":
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ellipsdef = ellipsoids.International()
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elif partdict["+ellps"] == "GRS80":
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ellipsdef = ellipsoids.GRS80()
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else:
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raise Exception("Could not find required +ellps element")
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# TO WGS 84 COEFFS
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if "+towgs84" in partdict:
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coeffs = partdict["+towgs84"].split(",")
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datumshift = parameters.DatumShift(coeffs)
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# if no datum, use ellips + towgs84 params to create the correct datum
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# ...??
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# COMBINE DATUM AND ELLIPS
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## create datum and ellips param objs
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ellips = parameters.Ellipsoid(ellipsdef,
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semimaj_ax=partdict.get("+a"),
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inv_flat=partdict.get("+f"))
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if "+datum" in partdict:
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datum = parameters.Datum(datumdef, ellips)
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elif "+towgs84" in partdict:
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datum = parameters.Datum(datumdef, ellips, datumshift)
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else:
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datum = parameters.Datum(datumdef, ellips)
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# PRIME MERIDIAN
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@@ -99,7 +131,7 @@ def from_proj4(string):
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# overwrite with user input
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if "+pm" in partdict:
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# for now only support longitude, later add name support:
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# for now only support longitude, later add name support from below:
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## greenwich 0dE
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## lisbon 9d07'54.862"W
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## paris 2d20'14.025"E
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@@ -134,6 +166,9 @@ def from_proj4(string):
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if partdict["+proj"] == "robin":
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projdef = projections.Robinson()
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elif partdict["+proj"] == "omerc":
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projdef = projections.ObliqueMercator()
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elif partdict["+proj"] == "longlat":
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projdef = None
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# set geogcs axis in correct order
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@@ -177,6 +212,56 @@ def from_proj4(string):
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obj = parameters.FalseNorthing(val)
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params.append(obj)
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# SCALING FACTOR
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if "+k_0" in partdict or "+k" in partdict:
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if "+k_0" in partdict: val = partdict["+k_0"]
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elif "+k" in partdict: val = partdict["+k"]
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obj = parameters.ScalingFactor(val)
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params.append(obj)
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# LATITUDE ORIGIN
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if "+lat_0" in partdict:
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val = partdict["+lat_0"]
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obj = parameters.LatitudeOrigin(val)
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params.append(obj)
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# LATITUDE TRUE SCALE
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if "+lat_ts" in partdict:
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val = partdict["+lat_ts"]
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obj = parameters.LatitudeTrueScale(val)
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params.append(obj)
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# LONGITUDE CENTER
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if "+lonc" in partdict:
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val = partdict["+lonc"]
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obj = parameters.LongitudeCenter(val)
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params.append(obj)
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# AZIMUTH
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if "+alpha" in partdict:
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val = partdict["+alpha"]
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obj = parameters.Azimuth(val)
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params.append(obj)
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# STD PARALLEL 1
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if "+lat1" in partdict:
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val = partdict["+lat1"]
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obj = parameters.LatitudeFirstStndParallel(val)
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params.append(obj)
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# STD PARALLEL 2
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if "+lat2" in partdict:
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val = partdict["+lat2"]
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obj = parameters.LatitudeSecondStndParallel(val)
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params.append(obj)
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# UNIT
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## set default
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@@ -208,33 +293,32 @@ def from_proj4(string):
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return crs
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def from_ogc_urn(string):
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# hmmm, seems like ogc urn could be anything incl online link, epsg, etc...
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# if necessary, must go online (or lookup local table) to get details
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# maybe test which of these and run their function?
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# examples urn:ogc:def:crs:OGC:1.3:CRS1
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# or with EPSG instead of OGC
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# If OGC, 1.3 is pdf version, and after that is a name from list below
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# as found in pdf: "Definition identifier URNs in OGC namespace"
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# OGC crs definitions
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# URN | CRS name | Definition reference
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# urn:ogc:def:crs:OGC:1.3:CRS1 Map CS B.2 in OGC 06-042
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# urn:ogc:def:crs:OGC:1.3:CRS84 WGS 84 longitude-latitude B.3 in OGC 06-042
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# urn:ogc:def:crs:OGC:1.3:CRS83 NAD83 longitude-latitude B.4 in OGC 06-042
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# urn:ogc:def:crs:OGC:1.3:CRS27 NAD27 longitude-latitude B.5 in OGC 06-042
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# urn:ogc:def:crs:OGC:1.3:CRS88 NAVD 88 B.6 in OGC 06-042
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# urn:ogc:def:crs:OGC:1.3:AUTO42001:99:8888 Auto universal transverse mercator B.7 in OGC 06-042
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# urn:ogc:def:crs:OGC:1.3:AUTO42002:99:8888 Auto transverse mercator B.8 in OGC 06-042
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# urn:ogc:def:crs:OGC:1.3:AUTO42003:99:8888 Auto orthographic B.9 in OGC 06-042
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# urn:ogc:def:crs:OGC:1.3:AUTO42004:99:8888 Auto equirectangular B.10 in OGC 06-042
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# urn:ogc:def:crs:OGC:1.3:AUTO42005:99 Auto Mollweide B.11 in OGC 06-042
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pass
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##def from_ogc_urn(string):
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## # hmmm, seems like ogc urn could be anything incl online link, epsg, etc...
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## # if necessary, must go online (or lookup local table) to get details
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## # maybe test which of these and run their function?
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## # examples urn:ogc:def:crs:OGC:1.3:CRS1
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## # or with EPSG instead of OGC
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##
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## # If OGC, 1.3 is pdf version, and after that is a name from list below
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## # as found in pdf: "Definition identifier URNs in OGC namespace"
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## # OGC crs definitions
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## # URN | CRS name | Definition reference
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## # urn:ogc:def:crs:OGC:1.3:CRS1 Map CS B.2 in OGC 06-042
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## # urn:ogc:def:crs:OGC:1.3:CRS84 WGS 84 longitude-latitude B.3 in OGC 06-042
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## # urn:ogc:def:crs:OGC:1.3:CRS83 NAD83 longitude-latitude B.4 in OGC 06-042
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## # urn:ogc:def:crs:OGC:1.3:CRS27 NAD27 longitude-latitude B.5 in OGC 06-042
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## # urn:ogc:def:crs:OGC:1.3:CRS88 NAVD 88 B.6 in OGC 06-042
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## # urn:ogc:def:crs:OGC:1.3:AUTO42001:99:8888 Auto universal transverse mercator B.7 in OGC 06-042
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## # urn:ogc:def:crs:OGC:1.3:AUTO42002:99:8888 Auto transverse mercator B.8 in OGC 06-042
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## # urn:ogc:def:crs:OGC:1.3:AUTO42003:99:8888 Auto orthographic B.9 in OGC 06-042
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## # urn:ogc:def:crs:OGC:1.3:AUTO42004:99:8888 Auto equirectangular B.10 in OGC 06-042
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## # urn:ogc:def:crs:OGC:1.3:AUTO42005:99 Auto Mollweide B.11 in OGC 06-042
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##
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## pass
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def from_unknown_text(text):
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# detect type and load with appropriate function
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"""Detect type and load with appropriate function"""
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if string.startswith("urn:"):
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from_ogc_urn(string)
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@@ -246,15 +330,15 @@ def from_unknown_text(text):
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from_unknown_wkt(string)
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elif string.startswith("EPSG:"):
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from_epsg_code(string)
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from_epsg_code(string.split(":")[1])
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elif string.startswith("ESRI:"):
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from_esri_code(string)
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from_esri_code(string.split(":")[1])
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elif string.startswith("SR-ORG:"):
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from_sr_code(string)
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from_sr_code(string.split(":")[1])
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else: raise Exception("Could not detect which type of crs")
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def from_geotiff_parameters(**params):
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pass
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##def from_geotiff_parameters(**params):
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## pass
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