Shapely is a BSD-licensed Python package for manipulation and analysis of planar geometric objects.

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1answer
132 views

Area in KM from Polygon of coordinates

I have polygons from coordinates in (python shapely) that looks like this POLYGON ((24.8085317 46.8512821, 24.7986952 46.8574619, 24.8088238 46.8664741, 24.8155239 46.8576335, 24.8085317 46.8512821)) ...
0
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1answer
138 views

Why can't Basemap's readshapefile read the world_adm0 shapefile?

I'm using the world shape file that can be found at https://trac.openstreetmap.org/browser/applications/editors/merkaartor-branches/merkaartor-0.14-fixes/share/world_shp/world_adm0.shp?rev=17052. ...
0
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1answer
89 views

Add attributes to an output shapefile schema (via meta)

I am trying to copy the schema of an existing shapefile and add to it in an output shapefile. Somehow I am not getting anywhere with this...though the docs seem very clear (and the download page : ...
0
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1answer
451 views

Calculating intersection between points and polygon in shapefile

I want accomplish the following using command line python tools only (shapely + fiona) I was wondering if there was a straightforward way for me to do the following: Read in a shapefile (all ...
3
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0answers
402 views

Importing matplotlib basemap and shapely

I'm not sure if this is the right place to ask this, but here we go. I have a python script that uses matplotlib's basemap and another part that uses shapely to do an intersection of 2 polygons. If ...
2
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0answers
72 views

Where is my Polygon?

I created this script to merge all of the polygons in a shapefile into a single polygon. I am using Python 2.7.5, Shapely 1.3.0, and Fiona 1.1.5. def merge(path_in, path_out): #Import Libraries ...
1
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0answers
11 views

Shapely's object.project method dealing with overlapping polyline

So I am interested in knowing how far along a polyline a given point sits. Python's shapely package has a method to do such a thing, see the below code: from shapely.geometry import LineString ip = ...
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0answers
81 views

Point in Polygon using Rtree and Shapely

This is a repeat of my question over on StackOverflow. All, I am wondering what the correct syntax is for doing a point in polygon search using Shapely and RTree. I'm really interested in speeding ...
1
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0answers
60 views

Reading/writing utf-8 encoded data using Fiona?

So I have a 'cpg' file with my 'in_file' shapefile data (definitely set to 'utf-8'). I was using 'meta' to create the same schema/crs as 'in_file'...though it runs, my text fields are borked on ...
1
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0answers
230 views

Generate random points in polygon. Algorithm question

i created a Random Point Generator in python using the algorithm described here by @whuber. The algorithm is implemented using Shapely, PostGIS and psycopg2. To boost performance pythons ...
1
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0answers
105 views

Adding a Property (attribute) to a geometry in Shapely/Fiona

Once you have line and polygon geometries, intersection using Shapely is very straight forward. What I did after that is to integrate all the looped 'intersected' geometries into a MultiLineString. ...
1
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0answers
56 views

Point in Polygon operation for 100G of data

I have lat/lon point locations for over a billion points, all based in the US. For each point I would like to generate a dataset that links them to their county and to their MSA according to US Census ...
1
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0answers
138 views

How to shift vertices of shapes in shapefile using FOSS python library?

I need to shift each vertice of shape in a shapefile (of any type:point, line, polygon, multiline etc.) with Python. I need to loop in all shapes, get the vertices, get it's coordinates and for each ...
1
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0answers
382 views

Install shapely for QGIS on Mac

I know there are a number of similar questions, but none of them have answers that allow me to use shapely in QGIS. In particular I am trying to install the Contour plugin, but this fails with the ...
1
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0answers
245 views

Why does polygon.intersection(complex_linestring) split the linestring and mess up Z?

I have a complex (self crossing) line with Z values which I'd like to truncate to the area inside a box. The problem is Shapely splits the line into simple (non-crossing) sections and the Z value at ...
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0answers
20 views

Understanding output point in polygon solution?

My question refers to an old solution which is provided in How do I find out if a given lat lon is in a KML Linear ring using shapely? Using python3 I needed to update the code somewhat to get this ...
0
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0answers
20 views

Finding common segments in Shapely LineStrings

I have two identically-sized collections of Shapely LineStrings, representing two sets of routes from a common origin to a set of common destinations. For each "pair" of routes (i.e. set_a[0], ...
0
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0answers
108 views

how to remove a point or polygon in shapely python

I want to place minimum number of sensors(circles) to cover a maximum area(polygon). I am using "Shapely",python module. I want to know if a sensor i.e a point buffer inside the range of the other ...
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0answers
102 views

need help creating layer with geom type wkbGeometryCollection with gdal python

I am having trouble creating a layer with geom type as geometry collection. Thus I am unable to output to a shapefile. I have attached code below. dstLayer is null. This does not happen if geom type ...