testing cartopy instead of geopandas

mapconverter-cartopy.py

@@ -0,0 +1,64 @@
+import cartopy.io.shapereader as shpreader
+import numpy as np
+from tqdm import tqdm 
+import zipfile
+from io import BytesIO
+#from urllib.request import urlopen
+import requests
+import argparse
+import os
+
+def convertLinestring(linestring):
+	outlist = []
+
+	pointx = linestring.coords.xy[0]
+	pointy = linestring.coords.xy[1]
+			
+	for j in range(len(pointx)):
+		outlist.extend([float(pointx[j]),float(pointy[j])])
+
+	outlist.extend([0,0])
+	return outlist
+
+def extractLines(shapefile, tolerance):
+	print("Extracting map lines")
+	outlist = []
+
+	for i in tqdm(range(len(shapefile))):
+
+		simplified = shapefile[i].geometry.simplify(tolerance, preserve_topology=False)
+
+		if(simplified.geom_type == "LineString"):
+			outlist.extend(convertLinestring(simplified))
+			
+		elif(simplified.geom_type == "MultiPolygon" or simplified.geom_type == "Polygon"):
+
+			if(simplified.boundary.geom_type == "MultiLineString"):
+				for boundary in simplified.boundary:
+					outlist.extend(convertLinestring(boundary))
+			else:
+				outlist.extend(convertLinestring(simplified.boundary))
+	
+		else:
+			print("Unsupported type: " + simplified.geom_type)
+
+
+
+	return outlist
+
+parser = argparse.ArgumentParser(description='viz1090 Natural Earth Data Map Converter')
+parser.add_argument("--tolerance", default=0.001, type=float, help="map simplification tolerance")
+parser.add_argument("--scale", default="10m", choices=["10m","50m","110m"], type=str, help="map file scale")
+parser.add_argument("mapfile", type=str, help="shapefile to load (e.g., from https://www.naturalearthdata.com/downloads/")	
+
+args = parser.parse_args()
+
+shapefile = list(shpreader.Reader(args.mapfile).records())
+
+outlist = extractLines(shapefile, args.tolerance)
+
+bin_file = open("mapdata.bin", "wb")
+np.asarray(outlist).astype(np.single).tofile(bin_file)
+bin_file.close()
+
+print("Wrote %d points" % (len(outlist) / 2))