mirror of
https://github.com/wassname/PyCRS.git
synced 2026-06-27 16:10:29 +08:00
Karim Bahgat
141 lines
3.7 KiB
Python
141 lines
3.7 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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# load world borders
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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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# convert coordinates
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fromproj = pyproj.Proj("+init=EPSG:4326")
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toproj = pyproj.Proj(crs.to_proj4())
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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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# get zoom area
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# NOTE: PYGEOJ data.bbox doesnt update.........FIX!
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data.add_all_bboxes()
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data.update_bbox()
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bbox = data.bbox
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## # to avoid inf bounds and no render in satellite view
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## xmins, ymins, xmaxs, ymaxs = zip(*(feat.geometry.bbox for feat in data))
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## inf = float("inf")
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## xmaxs = (xmax for xmax in xmaxs if xmax != inf)
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## ymaxs = (ymax for ymax in ymaxs if ymax != inf)
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## bbox = (min(xmins), min(ymins), max(xmaxs), max(ymaxs))
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# set up drawing
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c = pyagg.Canvas(600,600)
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c.geographic_space()
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c.zoom_bbox(*bbox)
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c.zoom_out(1.3)
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# draw
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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("unable to draw?", feat.geometry)
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c.view()
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###########################
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# OGC WKT
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print("--------")
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print("testing ogc wkt")
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print("")
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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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#crs = pycrs.parser.from_esri_code(54031)
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crs = pycrs.parser.from_sr_code(6978)
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wkt = crs.to_ogc_wkt()
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print("Original:", wkt)
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print("")
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crs = pycrs.parser.from_ogc_wkt(wkt)
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print("Reconstructed:", crs.to_ogc_wkt())
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print("")
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#render_world(crs)
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###########################
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# PROJ4
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print("--------")
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print("testing proj4")
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print("")
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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=-60 +lat_0=40 +h=2000000000000000000000000"
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print("Original:", proj4)
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print("")
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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("Reconstructed:", crs.to_proj4())
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print("")
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#render_world(crs)
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###########################
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# ESRI WKT/PRJ FILE
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print("--------")
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print("testing esri prj file")
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print("")
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crs = pycrs.loader.from_file("testfiles/natearth.prj")
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wkt = crs.to_esri_wkt()
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print("Original:", wkt)
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print("")
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crs = pycrs.parser.from_esri_wkt(wkt)
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print("Reconstructed:", crs.to_esri_wkt())
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print("")
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#render_world(crs)
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