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https://github.com/wassname/PyCRS.git
synced 2026-07-09 00:20:33 +08:00
Basic ogc wkt parsing into crsobj works.
Next: - Comb through to smooth out kinks, like how to handle default values such as datum (not always needed) or unit when not specified (on parsing or on outputting). Or handling basic lat long crs without proj. Adding wkt axis parsing. Cleaning messy wkt parsing maybe. - And finally add esri wkt, copy paste mostly, but some small differences.
This commit is contained in:
Karim Bahgat
+141
-10
@@ -73,7 +73,7 @@ def from_ogc_wkt(string):
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return consumed
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def _next_elem(chars, char):
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"char can be any char"
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"char must be the first char of the text that precedes brackets"
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header = ""
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# skip until next header
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while not char.isalpha():
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@@ -144,25 +144,150 @@ def from_ogc_wkt(string):
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char = next(chars, None)
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# parse into actual crs objects
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for header, content in crstuples:
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# toplevel collection
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def _parse(header, content):
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if header.upper() == "PROJCS":
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# find name
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# find geogcs elem
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name = content[0].strip('"')
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# find geogcs elem (by running parse again)
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subheader, subcontent = content[1]
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geogcs = _parse(subheader, subcontent)
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# find projection elem
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subheader, subcontent = content[2]
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for itemname in dir(projections):
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item = getattr(projections, itemname)
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try:
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item = item()
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if hasattr(item, "ogc_wkt") and subcontent[0].strip('"') == item.ogc_wkt:
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projdef = item
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break
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except:
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pass
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else:
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projdef = None
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proj = parameters.Projection(projdef)
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# find params
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params = []
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for part in content:
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if isinstance(part, tuple):
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subheader,subcontent = part
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if subheader == "PARAMETER":
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if subcontent[0] == '"Azimuth"':
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item = parameters.Azimuth(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"scale_factor"':
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item = parameters.ScalingFactor(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"latitude_of_origin"':
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item = parameters.LatitudeOrigin(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"standard_parallel_1"':
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item = parameters.LatitudeFirstStndParallel(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"standard_parallel_2"':
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item = parameters.LatitudeSecondStndParallel(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"Standard_Parallel_1"':
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item = parameters.LatitudeTrueScale(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"Central_Meridian"':
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item = parameters.CentralMeridian(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"Longitude_Of_Center"':
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item = parameters.LongitudeCenter(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"false_easting"':
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item = parameters.FalseEasting(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"false_northing"':
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item = parameters.FalseNorthing(subcontent[1])
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params.append(item)
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elif subcontent[0] == '"satellite_height"':
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item = parameters.SatelliteHeight(subcontent[1])
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params.append(item)
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# find unit
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pass
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#projcs = parameters.ProjCS("Unknown", geogcs, proj, params, unit)
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for part in content:
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if isinstance(part, tuple):
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subheader,subcontent = part
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if subheader == "UNIT":
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break
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if subcontent[0].strip('"') == "Meters":
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unittype = parameters.UnitType(units.Meter())
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elif subcontent[0].strip('"') == "degree":
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unittype = parameters.UnitType(units.Degree())
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metmult = parameters.MeterMultiplier(subcontent[1])
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unit = parameters.Unit(unittype, metmult)
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# find twin axis maybe
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## if len(content) >= 6:
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## twinax = (parameters.Axis(
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## else:
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## twinax = None
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# put it all together
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projcs = parameters.ProjCS("Unknown", geogcs, proj, params, unit) #, twinax)
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return projcs
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elif header.upper() == "GEOGCS":
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pass
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# name
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name = content[0]
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# datum
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subheader, subcontent = content[1]
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## datum name
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for itemname in dir(datums):
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item = getattr(datums, itemname)
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try:
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item = item()
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if hasattr(item, "ogc_wkt") and subcontent[0].strip('"') == item.ogc_wkt:
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datumdef = item
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break
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except:
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pass
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else:
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datumdef = datums.Unknown()
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## datum ellipsoid
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subsubheader, subsubcontent = subcontent[1]
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for itemname in dir(ellipsoids):
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item = getattr(ellipsoids, itemname)
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try:
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item = item()
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if hasattr(item, "ogc_wkt") and subsubcontent[0].strip('"') == item.ogc_wkt:
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ellipsdef = item
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break
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except:
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pass
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else:
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ellipsdef = None
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ellipsoid = parameters.Ellipsoid(ellipsdef, subsubcontent[1], subsubcontent[2])
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## datum shift
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if len(subcontent) >= 3:
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subsubheader, subsubcontent = subcontent[2]
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datumshift = parameters.DatumShift(subsubcontent)
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else:
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datumshift = None
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## put it all togehter
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datum = parameters.Datum(datumdef, ellipsoid, datumshift)
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# prime mer
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subheader, subcontent = content[2]
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prime_mer = parameters.PrimeMeridian(subcontent[1])
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# angunit
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subheader, subcontent = content[3]
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if subcontent[0].strip('"') == "Meters":
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unittype = parameters.UnitType(units.Meter())
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elif subcontent[0].strip('"') == "degree":
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unittype = parameters.UnitType(units.Degree())
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metmult = parameters.MeterMultiplier(subcontent[1])
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angunit = parameters.AngularUnit(unittype, metmult)
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# twin axis
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# ...
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# put it all together
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geogcs = parameters.GeogCS(name, datum, prime_mer, angunit, twin_ax=None)
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return geogcs
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# toplevel collection
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header, content in crstuples[0]
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toplevel = _parse(header, content)
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crs = parameters.CRS(toplevel)
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# use args to create crs
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return crstuples
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return crs
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##def from_unknown_wkt(string):
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## # detect if ogc wkt or esri wkt
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@@ -408,6 +533,12 @@ def from_proj4(string):
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obj = parameters.SatelliteHeight(val)
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params.append(obj)
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# TILT ANGLE
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if "+tilt" in partdict:
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val = partdict["+tilt"]
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obj = parameters.TiltAngle(val)
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params.append(obj)
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# PROJCS
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projcs = parameters.ProjCS("Unknown", geogcs, proj, params, unit)
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