Fiona is OGR's neater API
Project description
Fiona is OGR’s neater API – sleek and elegant on the outside, indomitable power on the inside.
Fiona provides a minimal, uncomplicated Python interface to the open source GIS community’s most trusted geodata access library and integrates readily with other Python GIS packages such as pyproj, Rtree, and Shapely.
How minimal? Fiona can read features as mappings from shapefiles or other GIS vector formats and write mappings as features to files using the same formats. That’s all. There aren’t any feature or geometry classes. Features and their geometries are just data.
Dependencies
Fiona requires Python 2.6+ and libgdal 1.3.2+.
Installation
Assuming you will install in a virtual environment:
$ virtualenv .
$ source bin/activate
(Fiona)$ pip install -d Fiona Fiona-0.5.tar.gz
(Fiona)$ export GDAL=${PATH_TO_GDAL}
(Fiona)$ cd Fiona
(Fiona)$ python setup.py build_ext -I ${GDAL}/include -L ${GDAL}/lib install
If GDAL/OGR headers and libs aren’t installed to a well known location, you must pass the locations in using setup arguments as shown above.
Usage
Collections are much like file objects. Features are mappings modeled on the GeoJSON format and if you want to do anything fancy with them you will probably need Shapely or something like it:
from fiona import collection
from shapely import asShape, mapping
# Open a source of features
with collection("docs/data/test_uk.shp", "r") as source:
# Define a schema for the feature sink
schema = input.schema.copy()
schema['geometry'] = 'Point'
# Open a new sink for features
with collection(
"test_write.shp", "w", driver="ESRI Shapefile", schema=schema
) as sink:
# Process only the features intersecting a box
for f in source.filter(bbox=(-5.0, 55.0, 0.0, 60.0)):
# Get their centroids using Shapely
f['geometry'] = mapping(asShape(f['geometry']).centroid)
# Stage feature for writing
sink.write(f)
# The sink shapefile is written to disk when its ``with`` block ends
Development and testing
Building from the source requires Cython. Tests require Nose. From the distribution root:
$ virtualenv .
$ source bin/activate
(Fiona)$ ./cypsrc
(Fiona)$ export GDAL=${PATH_TO_GDAL}
(Fiona)$ python setup.py build_ext -I ${GDAL}/include -L ${GDAL}/lib develop
(Fiona)$ python setup.py nosetests
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