mirror of
https://github.com/wassname/PyCRS.git
synced 2026-06-27 16:10:29 +08:00
Karim Bahgat
59007ef1fb
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.
65 lines
1.6 KiB
Python
65 lines
1.6 KiB
Python
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import json
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import urllib2
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from . import parser
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#################
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# USER FUNCTIONS
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#################
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# convenience methods for loading from different sources
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def from_url(url, format=None):
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# first get string from url
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string = urllib2.urlopen(url).read()
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# then determine parser
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if format:
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# user specified format
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format = format.lower().replace(" ", "_")
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func = parser.__getattr__("from_%s" % format)
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else:
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# unknown format
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func = parser.from_unknown_text
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# then load
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crs = func(string)
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return crs
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def from_file(filepath):
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if filepath.endswith(".prj"):
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string = open(filepath, "r").read()
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return parser.from_esri_wkt(string)
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elif filepath.endswith((".geojson",".json")):
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raw = open(filepath).read()
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geoj = json.loads(raw)
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if "crs" in geoj:
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crsinfo = geoj["crs"]
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if crsinfo["type"] == "name":
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string = crsinfo["properties"]["name"]
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return parser.from_unknown_text(string)
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elif crsinfo["type"] == "link":
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url = crsinfo["properties"]["name"]
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type = crsinfo["properties"].get("type")
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return loader.from_url(url, format=type)
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else: raise Exception("invalid geojson crs type: must be either name or link")
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else:
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# assume default wgs84 as per the spec
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return parser.from_epsg_code("4326")
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## elif filepath.endswith((".tif",".tiff",".geotiff")):
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## pass
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## # ...
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