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Fiona reads and writes spatial data files

Project description

Fiona is OGR’s neat, nimble, no-nonsense API.

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 feature records as mappings from shapefiles or other GIS vector formats and write mappings as records to files using the same formats. That’s all. There aren’t any feature or geometry classes. Records and their geometries are just data.

For more details, see:

Dependencies

Fiona requires Python 2.6+ and libgdal 1.8+. To build from a source distribution or repository clone you will need a C compiler and GDAL and Python development headers and libraries. While there are no official binary distributions or Windows support at this time, you can find Windows installers at http://www.lfd.uci.edu/%7Egohlke/pythonlibs/#fiona.

Installation

Unix-like systems

Assuming you’re using a virtualenv (if not, skip to the 4th command) and GDAL/OGR libraries, headers, and gdal-config program are installed to well known locations on your system (via your system’s package manager), installation is this simple:

$ mkdir fiona_env
$ virtualenv fiona_env
$ source fiona_env/bin/activate
(fiona_env)$ pip install Fiona

If gdal-config is not available or if GDAL/OGR headers and libs aren’t installed to a well known location, you must set include dirs, library dirs, and libraries options via the setup.cfg file or setup command line as shown below (using git):

(fiona_env)$ git clone git://github.com/Toblerity/Fiona.git
(fiona_env)$ cd Fiona
(fiona_env)$ python setup.py build_ext -I/path/to/gdal/include -L/path/to/gdal/lib -lgdal install

Windows

Binary installers are available at http://www.lfd.uci.edu/~gohlke/pythonlibs/#fiona and coming eventually to PyPI.

Usage

Records are read from and written to file-like Collection objects. Records are mappings modeled on the GeoJSON format. They don’t have any spatial methods of their own, so if you want to do anything fancy with them you will probably need Shapely or something like it. Here is an example of using Fiona to read some records from one data file, change their geometry attributes, and write them to a new data file.

import fiona

# Open a file for reading. We'll call this the "source."
with fiona.open('docs/data/test_uk.shp', 'r') as source:

    # The file we'll write to, the "sink", must be initialized with a
    # coordinate system, a format driver name, and a record schema.
    sink_schema = source.schema.copy()
    sink_schema['geometry'] = 'Point'

    # Open an output file, using the same format driver and coordinate
    # reference system as the source.
    with fiona.open(
            'test_write.shp', 'w',
            crs=source.crs, driver=source.driver, schema=sink_schema,
            ) as sink:

        # Process only the records intersecting a box.
        for f in source.filter(bbox=(-5.0, 55.0, 0.0, 60.0)):

            # Get a point on the boundary of the record's geometry.
            f['geometry'] = {
                'type': 'Point',
                'coordinates': f['geometry']['coordinates'][0][0]}

            # Write the record out.
            sink.write(f)

    # The sink's contents are flushed to disk and the file is closed
    # when its ``with`` block ends. This effectively executes
    # ``sink.flush(); sink.close()``.

Development and testing

Building from the source requires Cython. Tests require Nose. If the GDAL/OGR libraries, headers, and gdal-config program are installed to well known locations on your system (via your system’s package manager), you can do this:

(fiona_env)$ git clone git://github.com/Toblerity/Fiona.git
(fiona_env)$ cd Fiona
(fiona_env)$ python setup.py build_ext --inplace
(fiona_env)$ python setup.py develop
(fiona_env)$ python setup.py nosetests

If you have a non-standard environment, you’ll need to specify the include and lib dirs and GDAL library on the command line:

(fiona_env)$ python setup.py build_ext -I/path/to/gdal/include -L/path/to/gdal/lib -lgdal develop
(fiona_env)$ python setup.py nosetests

Changes

0.12 (2013-04-15)

  • Fix broken installation of extension modules (#35).
  • Log CPL errors at their matching Python log levels.
  • Use upper case for encoding names within OGR, lower case in Python.

0.11 (2013-04-14)

  • Cythonize .pyx files (#34).
  • Work with or around OGR’s internal recoding of record data (#35).
  • Fix bug in serialization of int/float PROJ.4 params.

0.10 (2013-03-23)

  • Add function to get the width of str type properties.
  • Handle validation and schema representation of 3D geometry types (#29).
  • Return {‘geometry’: None} in the case of a NULL geometry (#31).

0.9.1 (2013-03-07)

  • Silence the logger in ogrext.so (can be overridden).
  • Allow user specification of record field encoding (like ‘Windows-1252’ for Natural Earth shapefiles) to help when OGR can’t detect it.

0.9 (2013-03-06)

  • Accessing file metadata (crs, schema, bounds) on never inspected closed files returns None without exceptions.
  • Add a dict of supported_drivers and their supported modes.
  • Raise ValueError for unsupported drivers and modes.
  • Remove asserts from ogrext.pyx.
  • Add validate_record method to collections.
  • Add helpful coordinate system functions to fiona.crs.
  • Promote use of fiona.open over fiona.collection.
  • Handle Shapefile’s mix of LineString/Polygon and multis (#18).
  • Allow users to specify width of shapefile text fields (#20).

0.8 (2012-02-21)

  • Replaced .opened attribute with .closed (product of collection() is always opened). Also a __del__() which will close a Collection, but still not to be depended upon.
  • Added writerecords method.
  • Added a record buffer and better counting of records in a collection.
  • Manage one iterator per collection/session.
  • Added a read-only bounds property.

0.7 (2012-01-29)

  • Initial timezone-naive support for date, time, and datetime fields. Don’t use these field types if you can avoid them. RFC 3339 datetimes in a string field are much better.

0.6.2 (2012-01-10)

  • Diagnose and set the driver property of collection in read mode.
  • Fail if collection paths are not to files. Multi-collection workspaces are a (maybe) TODO.

0.6.1 (2012-01-06)

  • Handle the case of undefined crs for disk collections.

0.6 (2012-01-05)

  • Support for collection coordinate reference systems based on Proj4.
  • Redirect OGR warnings and errors to the Fiona log.
  • Assert that pointers returned from the ograpi functions are not NULL before using.

0.5 (2011-12-19)

  • Support for reading and writing collections of any geometry type.
  • Feature and Geometry classes replaced by mappings (dicts).
  • Removal of Workspace class.

0.2 (2011-09-16)

  • Rename WorldMill to Fiona.

0.1.1 (2008-12-04)

  • Support for features with no geometry.

Credits

Fiona is written by:

With contributions by:

Fiona would not be possible without the great work of Frank Warmerdam and other GDAL/OGR developers.

Some portions of this work were supported by a grant (for Pleiades) from the U.S. National Endowment for the Humanities (http://www.neh.gov).

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