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Name: pygeoif
Version: 0.6
Summary: A basic implementation of the __geo_interface__
Home-page: https://github.com/cleder/pygeoif/
Author: Christian Ledermann
Author-email: christian.ledermann@gmail.com
License: LGPL
Description: Introduction
============
PyGeoIf provides a GeoJSON-like protocol for geo-spatial (GIS) vector data.
see https://gist.github.com/2217756
Other Python programs and packages that you may have heard of already
implement this protocol:
* ArcPy http://help.arcgis.com/en/arcgisdesktop/
* descartes https://bitbucket.org/sgillies/descartes/
* geojson http://pypi.python.org/pypi/geojson/
* PySAL http://pysal.geodacenter.org/
* Shapely https://github.com/Toblerity/Shapely
* pyshp https://pypi.python.org/pypi/pyshp
So when you want to write your own geospatial library with support
for this protocol you may use pygeoif as a starting point and build
your functionality on top of it
You may think of pygeoif as a 'shapely ultralight' which lets you
construct geometries and perform **very** basic operations like
reading and writing geometries from/to WKT, constructing line strings
out of points, polygons from linear rings, multi polygons from
polygons, etc. It was inspired by shapely and implements the
geometries in a way that when you are familiar with shapely
you feel right at home with pygeoif
It was written to provide clean and python only geometries for
fastkml_
.. _fastkml: http://pypi.python.org/pypi/fastkml/
PyGeoIf is continually tested with *Travis CI*
.. image:: https://api.travis-ci.org/cleder/pygeoif.png
:target: https://travis-ci.org/cleder/pygeoif
.. image:: https://coveralls.io/repos/cleder/pygeoif/badge.png?branch=master
:target: https://coveralls.io/r/cleder/pygeoif?branch=master
Example
========
>>> from pygeoif import geometry
>>> p = geometry.Point(1,1)
>>> p.__geo_interface__
{'type': 'Point', 'coordinates': (1.0, 1.0)}
>>> print p
POINT (1.0 1.0)
>>> p1 = geometry.Point(0,0)
>>> l = geometry.LineString([p,p1])
>>> l.bounds
(0.0, 0.0, 1.0, 1.0)
>>> dir(l)
['__class__', '__delattr__', '__dict__', '__doc__', '__format__',
'__geo_interface__', '__getattribute__', '__hash__', '__init__',
'__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__',
'__setattr__', '__sizeof__', '__str__', '__subclasshook__',
'__weakref__', '_coordinates', '_geoms', '_type', 'bounds', 'coords',
'geom_type', 'geoms', 'to_wkt']
>>> print l
LINESTRING (1.0 1.0, 0.0 0.0)
You find more examples in the
`test_main.py <https://github.com/cleder/pygeoif/blob/master/pygeoif/test_main.py>`_
file which cover every aspect of pygeoif or in fastkml_.
Classes
========
All classes implement the attribute:
* __geo_interface__: as dicussed above
All geometry classes implement the attributes:
* geom_type: Returns a string specifying the Geometry Type of the object
* bounds: Returns a (minx, miny, maxx, maxy) tuple (float values) that bounds the object.
* wkt: Returns the 'Well Known Text' representation of the object
and the method:
* to_wkt which also prints the object
GeoObject
----------
Base class for Geometry, Feature, and FeatureCollection
Geometry
--------
Base class for geometry objects.
Inherits from Geoobject.
Point
-----
A zero dimensional geometry
A point has zero length and zero area.
Attributes
~~~~~~~~~~~
x, y, z : float
Coordinate values
Example
~~~~~~~~
>>> p = Point(1.0, -1.0)
>>> print p
POINT (1.0000000000000000 -1.0000000000000000)
>>> p.y
-1.0
>>> p.x
1.0
LineString
-----------
A one-dimensional figure comprising one or more line segments
A LineString has non-zero length and zero area. It may approximate a curve
and need not be straight. Unlike a LinearRing, a LineString is not closed.
Attributes
~~~~~~~~~~~
geoms : sequence
A sequence of Points
LinearRing
-----------
A closed one-dimensional geometry comprising one or more line segments
A LinearRing that crosses itself or touches itself at a single point is
invalid and operations on it may fail.
A Linear Ring is self closing
Polygon
--------
A two-dimensional figure bounded by a linear ring
A polygon has a non-zero area. It may have one or more negative-space
"holes" which are also bounded by linear rings. If any rings cross each
other, the geometry is invalid and operations on it may fail.
Attributes
~~~~~~~~~~~
exterior : LinearRing
The ring which bounds the positive space of the polygon.
interiors : sequence
A sequence of rings which bound all existing holes.
MultiPoint
----------
A collection of one or more points
Attributes
~~~~~~~~~~~
geoms : sequence
A sequence of Points
MultiLineString
----------------
A collection of one or more line strings
A MultiLineString has non-zero length and zero area.
Attributes
~~~~~~~~~~~
geoms : sequence
A sequence of LineStrings
MultiPolygon
-------------
A collection of one or more polygons
Attributes
~~~~~~~~~~~~~
geoms : sequence
A sequence of `Polygon` instances
GeometryCollection
-------------------
A heterogenous collection of geometries (Points, LineStrings, LinearRings
and Polygons)
Attributes
~~~~~~~~~~~
geoms : sequence
A sequence of geometry instances
Please note:
GEOMETRYCOLLECTION isn't supported by the Shapefile format.
And this sub-class isn't generally supported by ordinary GIS sw (viewers and so on).
So it's very rarely used in the real GIS professional world.
Example
~~~~~~~~
>>> from pygeoif import geometry
>>> p = geometry.Point(1.0, -1.0)
>>> p2 = geometry.Point(1.0, -1.0)
>>> geoms = [p, p2]
>>> c = geometry.GeometryCollection(geoms)
>>> c.__geo_interface__
{'type': 'GeometryCollection', 'geometries': [{'type': 'Point', 'coordinates': (1.0, -1.0)},/
{'type': 'Point', 'coordinates': (1.0, -1.0)}]}
>>> [geom for geom in geoms]
[Point(1.0, -1.0), Point(1.0, -1.0)]
Feature
-------
Aggregates a geometry instance with associated user-defined properties.
Attributes
~~~~~~~~~~~
geometry : object
A geometry instance
properties : dict
A dictionary linking field keys with values associated with with geometry instance
Example
~~~~~~~~
>>> p = Point(1.0, -1.0)
>>> props = {'Name': 'Sample Point', 'Other': 'Other Data'}
>>> a = Feature(p, props)
>>> a.properties
{'Name': 'Sample Point', 'Other': 'Other Data'}
>>> a.properties['Name']
'Sample Point'
FeatureCollection
-----------------
A heterogenous collection of Features
Attributes
~~~~~~~~~~~
features: sequence
A sequence of feature instances
Example
~~~~~~~~
>>> from pygeoif import geometry
>>> p = geometry.Point(1.0, -1.0)
>>> props = {'Name': 'Sample Point', 'Other': 'Other Data'}
>>> a = geometry.Feature(p, props)
>>> p2 = geometry.Point(1.0, -1.0)
>>> props2 = {'Name': 'Sample Point2', 'Other': 'Other Data2'}
>>> b = geometry.Feature(p2, props2)
>>> features = [a, b]
>>> c = geometry.FeatureCollection(features)
>>> c.__geo_interface__
{'type': 'FeatureCollection', 'features': [{'geometry': {'type': 'Point', 'coordinates': (1.0, -1.0)},/
'type': 'Feature', 'properties': {'Other': 'Other Data', 'Name': 'Sample Point'}},/
{'geometry': {'type': 'Point', 'coordinates': (1.0, -1.0)}, 'type': 'Feature',/
'properties': {'Other': 'Other Data2', 'Name': 'Sample Point2'}}]}
>>> [feature for feature in c]
[<Feature Instance Point geometry 2 properties>, <Feature Instance Point geometry 2 properties>]
Functions
=========
as_shape
--------
Create a pygeoif feature from an object that provides the __geo_interface__
>>> from shapely.geometry import Point
>>> from pygeoif import geometry
>>> geometry.as_shape(Point(0,0))
<pygeoif.geometry.Point object at 0x...>
from_wkt
---------
Create a geometry from its WKT representation
>>> p = geometry.from_wkt('POINT (0 1)')
>>> print p
POINT (0.0 1.0)
signed_area
------------
Return the signed area enclosed by a ring using the linear time
algorithm at http://www.cgafaq.info/wiki/Polygon_Area. A value >= 0
indicates a counter-clockwise oriented ring.
orient
-------
Returns a copy of the polygon with exterior in counter-clockwise and
interiors in clockwise orientation for sign=1.0 and the other way round
for sign=-1.0
mapping
-------
Returns the __geo_interface__ dictionary
Development
===========
Installation
------------
You can install PyGeoIf from pypi using pip::
pip install pygeoif
Testing
-------
In order to provide a Travis-CI like testing of the PyGeoIf package during
development, you can use tox (``pip install tox``) to evaluate the tests on
all supported Python interpreters which you have installed on your system.
You can run the tests with ``tox --skip-missin-interpreters`` and are looking
for output similar to the following::
______________________________________________________ summary ______________________________________________________
SKIPPED: py26: InterpreterNotFound: python2.6
py27: commands succeeded
SKIPPED: py32: InterpreterNotFound: python3.2
SKIPPED: py33: InterpreterNotFound: python3.3
py34: commands succeeded
SKIPPED: pypy: InterpreterNotFound: pypy
SKIPPED: pypy3: InterpreterNotFound: pypy3
congratulations :)
You are primarily looking for the ``congratulations :)`` line at the bottom,
signifying that the code is working as expected on all configurations
available.
Changelog
=========
0.6 (2015/08/04)
-----------------
- Add id to feature [jzmiller1]
0.5 (2015/07/13)
-----------------
- Add __iter__ method to FeatureCollection and GeometryCollection [jzmiller1].
- add pypy and pypy3 and python 3.4 to travis.
- Add tox configuration for performing local testing [Ian Lee].
- Add Travis continuous deployment.
0.4 (2013/10/25)
-----------------
- after a year in production promote it to `Development Status :: 5 - Production/Stable`
- MultiPolygons return tuples as the __geo_interface__
0.3.1 (2012/11/15)
------------------
- specify minor python versions tested with Travis CI
- fix for signed area
0.3 (2012/11/14)
-------------------
- add GeometryCollection
- len(Multi*) and len(GeometryCollection) returns the number of contained Geometries
- add orient function to get clockwise or counterclockwise oriented poygons
- add signed_area function
- add _set_orientation method to lineStrings, Polygons and MultiPolygons
0.2.1 (2012/08/02)
-------------------
- as_shape also accepts an object that is neither a dictionary nor has a __geo_interface__ but can be converted into a __geo_interface__ compliant dictionary
0.2 (2012/08/01)
-----------------
- change license to LGPL
- add wkt as a property
- as_shape also accepts a __geo_interface__ compliant dictionary
- test with python3
0.1 (2012/07/27)
-----------------
- initial release
Keywords: GIS Spatial WKT
Platform: UNKNOWN
Classifier: Topic :: Scientific/Engineering :: GIS
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.2
Classifier: Programming Language :: Python :: 3.3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)
Classifier: Development Status :: 5 - Production/Stable
Classifier: Operating System :: OS Independent
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