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.
100 lines
2.9 KiB
Python
100 lines
2.9 KiB
Python
import pycrs
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###########################
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# Drawing routine for testing
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def render_world(crs):
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import urllib2
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import json
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import pygeoj
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import pyagg
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import pyproj
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import random
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c = pyagg.Canvas(600,600)
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c.geographic_space()
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raw = urllib2.urlopen("https://raw.githubusercontent.com/johan/world.geo.json/master/countries.geo.json").read()
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rawdict = json.loads(raw)
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data = pygeoj.load(data=rawdict)
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proj4 = crs.to_proj4()
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fromproj = pyproj.Proj("+init=EPSG:4326")
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toproj = pyproj.Proj(proj4)
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print data.bbox
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for feat in data:
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if feat.geometry.type == "Polygon":
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feat.geometry.coordinates = [zip(*pyproj.transform(fromproj, toproj, zip(*ring)[0], zip(*ring)[1]))
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for ring in feat.geometry.coordinates]
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elif feat.geometry.type == "MultiPolygon":
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feat.geometry.coordinates = [
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[zip(*pyproj.transform(fromproj, toproj, zip(*ring)[0], zip(*ring)[1]))
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for ring in poly]
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for poly in feat.geometry.coordinates]
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data.add_all_bboxes()
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xmins, ymins, xmaxs, ymaxs = zip(*(feat.geometry.bbox for feat in data))
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bbox = (min(xmins), min(ymins), max(xmaxs), max(ymaxs))#33333, 33333) # to avoid inf bounds and no render
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# print data.bbox #PYGEOJ data.bbox doesnt update.........FIX!
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print bbox
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c.zoom_bbox(*bbox)
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for feat in data:
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try: c.draw_geojson(feat.geometry,
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fillcolor=tuple(random.randrange(255) for _ in range(3)),
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outlinecolor="white")
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except:
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# NOTE: feat.__geo_interface__ is one level too high maybe??
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print feat.geometry
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c.view()
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###########################
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# OGC WKT
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print "testing ogc wkt"
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crs = pycrs.parser.from_sr_code(54030)
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#crs = pycrs.parser.from_sr_code(22)
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print crs.to_proj4()
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wkt = crs.to_ogc_wkt()
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print "Original:", wkt
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print "Reconstructed:", pycrs.parser.from_ogc_wkt(wkt).to_ogc_wkt()
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render_world(crs)
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###########################
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# PROJ4
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print "testing proj4"
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#proj4 = "+proj=robin +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
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#proj4 = "+proj=longlat +ellps=WGS84 +datum=WGS84"
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#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 "
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proj4 = "+proj=larr +datum=WGS84 +lon_0=0 +lat_ts=45 +x_0=0 +y_0=0 +ellps=WGS84 +units=m +no_defs"
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#proj4 = "+proj=nsper +datum=WGS84 +ellps=WGS84 +lon_0=44 +lat_0=30 +h=200000000"
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#crs = pycrs.parser.from_esri_code(54030)
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#crs = pycrs.parser.from_sr_code(7898)
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#crs = pycrs.parser.from_epsg_code(4324)
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#crs = pycrs.parser.from_sr_code(6618)
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crs = pycrs.parser.from_proj4(proj4)
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#crs = pycrs.parser.from_ogc_wkt(wkt)
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print crs.to_proj4()
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render_world(crs)
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###########################
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# PRJ FILE
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crs = pycrs.loader.from_file("testfiles/natearth.prj")
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print crs
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