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Questions tagged [fiona]

Fiona is OGR's new, neat, Pythonic API

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1answer
1k views

differences in distance between shapely and geopy

I am getting totally different distances from shapely and geopy. On one hand - it makes total sense, shapely measures on a plane and geopy measures on a spheroid. But the differences are so dramatic, ...
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2answers
2k 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 ...
2
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1answer
4k views

Using Geometry collections with Fiona to write output of Multipoints and Points?

I am getting the following error on this function: ValueError: Record's geometry type does not match collection schema's geometry type: 'Point' != 'MultiPoint' The problem is that I have multipoints ...
3
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2answers
16k views

How to measure distance using shapely

Reading the documentation...it looks like I should have this right, but I don't. The example is: Point(0,0).distance(Point(1,1)) 1.4142135623730951 Based on this example I wrote this block (....
2
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1answer
509 views

How to call 'shapely' .coords on a fiona filtered list?

I have to filter a shapefile by attribute then compare it to another shapefile using .coords...however I am a bit perplexed how to do this as my filter is returning a list type...(and .coords requires ...
2
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1answer
676 views

Error with Python Script using Shapely

My professor gave us a basic Python script that demonstrated how Shapely works with a shapefile, however it's not working for me. Here is the code: from shapely.geometry import mapping, shape from ...
0
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1answer
1k views

Shapefile projection for Matplotlib Basemap

Preface: First time working with GIS data. I'm using python's Basemap library for overlaying data on maps. The tutorial I'm using includes a shapefile for London (london_wards.shp). I use the ...
1
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3answers
9k views

Only read specific attribute columns of a shapefile with Geopandas / Fiona

Having geopandas installed in my Python environment, I can read a shapefile into a geodataframe with In: import geopandas as gpd myShapefile = gpd.read_file(path_to_my_shapefile) print(myShapefile) ...
1
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1answer
3k views

Multi-part Geometrical Intersection error

I am working with intersection of polygon and line segments (continued from a previous question). When a Line intersects with a Polygon, the result is a LineString; When a LineRing intersects with ...
8
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1answer
8k views

Line vs. Polygon Intersection Coordinates

I am working with Python, Shapely and Fiona... Is there any way where I can give in an input of a line shapefile and a polygon shapefile, and get a result of the intersection points and their ...
1
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0answers
181 views

Fiona write crashes

I am trying to write a new shapefile with fiona but after creating the features, i keep getting this output after the program crashes: The program '[6668] python.exe' has exited with code -1073741819 ...
6
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2answers
16k views

Convert shapely polygon coordinates

I am trying to work with a shapefile using shapely, fiona and python. The original coordinate system is in latitude and longitude that I am trying to convert to state plane system. So I want an ...
3
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2answers
40k views

How to fix python ImportError: DLL load failed: The specified module could not be found?

During import fiona, I am getting following error. Error is different from other user so I asked this question may be it is repeated. import fiona Traceback (most recent call last): File "D:/...
13
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3answers
9k views

Understanding use of spatial indexes with RTree?

I'm having trouble understanding the use of spatial indexes with RTree. Example: I have 300 buffered points, and I need to know each buffer's intersection area with a polygon shapefile. The polygon ...
1
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2answers
643 views

Different output for Fiona Shapefile CRS

Loving fiona, but have a small coordinate system issue. I'm trying to read the crs property on a shapefile to validate projection. Below I contrast fiona documentation with what is output on my ...
4
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1answer
6k views

Iterate through a shapefile

How do i iterate through a shapefile using shapely. This is my code but it keeps outputting the same id. I think that it keeps looking at the same record. fc = fiona.open("file1.shp") print fc.schema ...
0
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1answer
226 views

Writing shapefile with projection defined crashes Fiona?

I have the same problem as in Writing shapefile with projection defined crashes fiona It says that was an issue with GDAL. I cleaned my site-packages of anything GDAL, fiona, six related. Then ...
5
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2answers
7k views

Count the number of points in a (multi)polygon in shapely?

I'm using Python, Shapely and Fiona to process some shapefiles. Is there an easy way to count the number of points in a polygon/multipolygon in Shapely and Fiona?
1
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1answer
477 views

Properly writing floats to feature properties of a new shapefile in Fiona

The following piece of code returns a shp following the driver and crs of a model .shp. import numpy as np #just to test I correctly handle data types import fiona from shapely.geometry import ...
1
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1answer
198 views

Is it possible to read shapefile field aliases values using fiona?

I am using fiona to read a shapefile, but not sure about how to get field aliases. Is this possible using this great library?
18
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1answer
1k views

Calculating Focal Statistics for Special Neighborhood?

I'm looking to calculate focal statistics for each cell of a raster, within a neighborhood of a specified criteria. Background - I have three binary rasters, each representing a single vegetation ...
4
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1answer
4k views

Fiona + Shapely: Loading a set of LineStrings and writing their centroids to a shapefile, including original properties

I am using Fiona to load a set of links. Then I put every record in the rows of a pandas.DataFrame. Then I get the centroid of each LineString using Shapely. Afterwards I copy the schema of the ...
3
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2answers
2k views

shapefile record has no attribute named bounds

This is the code that I am using to print the bounds of my shapefile. import fiona import shapely import shapely.geometry fc = fiona.open("filename.shp") shapefile_record = fc.next() shape = ...
4
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1answer
3k views

Shapely/ Python looping through a number of polygons

I am trying to loop through a set of polygons in shapely so using python) to determine whether they overlap or not. I do not want to do it manually as later i want to generalise the procedure and do ...
2
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1answer
711 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. ...
2
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0answers
104 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 ...
2
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1answer
1k views

Open a .osm.pbf file with fiona in python

I would like to open a .osm.pbf using fiona in Python. I can't find much documentation on this. How can I does one do this? I have done it using ogr2ogr.
3
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3answers
11k views

MultiLineString to separate individual lines using Python with GDAL/OGR, Fiona, Shapely

There are lots of MultiLineString features in a polyline shapefile. The problem is to split these lines into separate individual lines. There is a similar question with PostGIS, but I need to code in ...
31
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4answers
17k views

More Efficient Spatial join in Python without QGIS, ArcGIS, PostGIS, etc

I'm attempting to do a spatial join much like the example here: Is there a python option to "join attributes by location"?. However, that approach seems really inefficient / slow. Even ...
1
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0answers
36 views

How can I filter a MultiPoint Z / xyz points against a 2d polygon [duplicate]

I would like to filter point data from LIDAR scans (3d) by parcel plot lines (2d). I began with loading the lidar data into microsoft sql and performing a STIntersects between the MultiPoint and the ...
0
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1answer
419 views

Change Attirbute Name (Fiona)

I have a shapefile that has 2 attributes named "X" and "Y". I want to change this to "Lon" and "Lat". My (limited) experience tells me that I should read in the original shapefile, preserve the ...
3
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2answers
965 views

Writing shapefile with projection defined crashes fiona

I've just started trying to use Fiona to write out shapefiles. I found the example code below, which seems to work fine from shapely.geometry import mapping, Polygon import fiona # Here's an example ...
0
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1answer
169 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 : ...
4
votes
1answer
11k views

Using Fiona to write a new shapefile from scratch

I am new to Fiona, and trying to wrap my head around reading a csv file and writing out an ESRI shapefile. I have most of it down, but am missing two things; (1) defining the projection/spatial ...
-1
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1answer
374 views

Fiona error on installation [closed]

Receiving the following error when installing Fiona.Does anyone can guide ? error: Unable to find vcvarsall.bat
4
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1answer
2k views

Select by attributes within the fiona Python module

Is it possible to select polygons from a shapefile based upon their attributes using the Fiona Python module? I can't seem to find anything in the docs, but it seems like a strange thing not to be ...
8
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2answers
5k views

Fiona: get each feature extent (bounds)

I was looking in Fiona to get for each feature its extent but I didn't find how. I have try to far to do something like below import fiona with fiona.open('countries/ne_10m_admin_0_countries.shp', '...
0
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1answer
2k views

geopandas error when writing to_file() “ValueError: 'long' is not in list”

I'm having a problem getting the "to_file()" function to work with geopandas import geopandas as gpd f = gpd.read_file('fin.shp') f.to_file('fout.shp') Error Output: ---------------------------...
1
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2answers
674 views

Add joined data in fiona with new schema

Looked more closely at problem on how to add data to a shapefile using fiona. Docs for fiona very unclear on how to do this. I know how to add a schema after that looks very unwieldy and can not ...
1
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2answers
325 views

Old Windows Installers for python library fiona

Due the the recent bug as presented here for fiona 1.1, i am obliged to use a version of fiona in 1.0.x on windows 8.1. however, i can't find older versions of the installer at here. Are there any ...
2
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3answers
716 views

How to get a bbox selection of huge shapefile as GeoJSON?

I have a 4.29 GB Shapefile from which I want to extract features as GeoJSON, defined by a bounding box. This should be as fast as possible, because I want to use it in a web application. My first ...
3
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2answers
2k views

Folium GeoJSON Overlay Not Appearing

I am in the midst of a task which involves the clustering of assessment neighborhoods into larger neighborhoods (data link). The goal is build these neighborhoods in a manner consistent with major ...
5
votes
5answers
8k views

How to install Fiona to read Shapefile attributes with OSGeo4W?

I´m developing a plugin in Python and I need to read the shapefile attributes, so I found the Fiona API and dbfpy also but I don't understand how to install these packages because I install the QGIS ...
17
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1answer
6k views

Finding Nearest Line Segments to Point using shapely?

Background From a known Point, I require to establish the nearest surrounding "visible perimeter" against a table of MultiLineStrings, as shown on the diagram. I've searched this site with a number ...
2
votes
1answer
5k views

Finding differences between two shapefiles in Python

I'm trying to find out whether there were any border changes between two yearly shapefiles. I've heard a lot of praise for Python's open source GIS tools like Shapely/Fiona, and thought I would try ...
0
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1answer
1k 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 ...
1
vote
2answers
272 views

Fiona: won't install in Debian7.x-64bits/Python2.7

I need to install Fiona in my Debian7.x-64bits/Python2.7 machine. I already installed GDAL/OGR, pip, virtualenv, and six. I am using Python 2.7 so argparse is also installed. The installation protocol ...
4
votes
1answer
5k views

Fiona - Preffered method for defining a schema

I'm fairly new to the world of python and GIS - so this is definitely a beginner question. I am following Tom Macwrights small guide to Shapely and Fiona, and I noticed that even when opening the ...
1
vote
2answers
1k views

problems with py2exe, shapely and fiona

I have a short python script, called test: import fiona with fiona.open("C:\\Essai_compil", 'r') as l_Obs_shp: for shp in l_Obs_shp: print shp['geometry'] I want to compile with ...
11
votes
2answers
15k views

Creating Shapely MultiPolygons from shapefile MultiPolygons

I'm reading a shapefile using Fiona: with fiona.open('data/boroughs/boroughs_n.shp') as source: mpolys = [p for p in source] candidate = polys[0]['geometry'] this gives me a dict containing a ...