geos

I am using Python3.4 on Mac OSX and I am trying to import shapely. I am however unable to do so. Here is my traceback: from shapely.geometry import Point File "/Users/tc9/Library/Python/3.4/lib/python/site-packages/shapely/geometry/__init__.py", line 4, in <module> from .base import CAP_STYLE, JOIN_STYLE File "/Users/tc9/Library/Python/3.4/lib/python/site-packages/shapely/geometry/base.py", line 9, in <module> from shapely.coords import CoordinateSequence File "/Users/tc9/Library/Python/3.4/lib/python/site-packages/shapely/coords.py", line 8, in <module> from shapely.geos import lgeos File "

I have the following (simplified) Model: class Zone(gismodels.Model): name = gismodels.CharField() poly = gismodels.PolygonField() I want to create and save a polygon that represents a circle, based upon a given point and radius. The only way I can figure out how to achieve this, is to call the postgis ST_Buffer function using raw SQL. I'm really hoping that there is another way. Is it possible to access the GEOS buffer methods? Yes, it is possible to use the geos buffer method : >>> from django.contrib.gis import geos >>> center = geos.Point(5, 5) >>> radius = 2 >>> circle = center.buffer

I'm a newbie to making/plotting on maps with python, been trying to follow this blogpost to generate a world map (http://sciblogs.co.nz/seeing-data/2011/08/12/plotting-geographic-data-on-a-world-map-with-python/). Got stuck with a few things here: Installing Basemap (a Matplotlib extension for plotting data on geographic projections). from mpl_toolkits.basemap import Basemap Traceback (most recent call last): File "geos_demo.py", line 1, in <module> from mpl_toolkits.basemap import Basemap ImportError: No module named mpl_toolkits.basemap Install Shapely, but the following error occurs [1]:

There is a polyline with a list of coordinates of the vertices = [(x1,y1), (x2,y2), (x3,y3),...] and a point(x,y). In Shapely, geometry1.distance(geometry2) returns the shortest distance between the two geometries. >>> from shapely.geometry import LineString, Point >>> line = LineString([(0, 0), (5, 7), (12, 6)]) # geometry2 >>> list(line.coords) [(0.0, 0.0), (5.0, 7.0), (12.0, 6.0)] >>> p = Point(4,8) # geometry1 >>> list(p.coords) [(4.0, 8.0)] >>> p.distance(line) 1.4142135623730951 But I also need to find the coordinate of the point on the line that is closest to the point(x,y). In the