This is a pre-production deployment of Warehouse, however changes made here WILL affect the production instance of PyPI.
Latest Version Dependencies status unknown Test status unknown Test coverage unknown
Project Description

Karta is a package for spatial analysis in Python. It streamlines data processing by providing efficient generic geographical types for vector and raster sources as well as a selection of analysis functions.

For example, read or create vector geometries:

point = Point((-130.0, 52.0), crs=LonLatWGS84)
line = read_geojson("linedata.json")
polygon = Polygon([(-515005.78, -1301130.53),
                   (-579174.89, -1282271.94),
                   (-542977.83, -1221147.82),
                   (-437864.05, -1251641.55),
                   (-438160.72, -1252421.48),
                   (-437961.28, -1285314.00)],
                   crs=NSIDCNorth)

Perform simple queries:

point2 = Point((-25.0, 48.0), crs=LonLatWGS84)
point.distance(point2)          # Distance in geographical units
line.intersects(polygon)        # True or False
ch = polygon.convex_hull()      # Returns a new polygon
ch.to_shapefile("poly.shp")

Load and manipulate raster data:

grid = read_gtiff("landsat_scene.tif")  # Leverages GDAL
grid.profile(line)              # Collect data along a line
grid.resample(500.0, 500.0)     # Return a grid resampled at a new resolution

Documentation

See the online manual, the tutorial, or read the API documentation.

The manual can be built offline using Sphinx. Building the documentation requires numpydoc.

Package Overview

  • karta.crs: framework for coordinate reference systems and geodetic calculations
  • karta.vector.geometry: geometry classes Point, Multipoint, Line, and Polygon with associated methods such as length, area, intersections, membership testing, convex hulls, and affine transformations
  • karta.raster.grid: Grid classes including RegularGrid class (supporting CRS-aware clipping, sampling, profiling along vector tracks), and experimental WarpedGrid
  • tests: unit tests, to be run with python tests/runtests.py

Formats

Karta provides a basic working interface to several of common file formats. Currently implemented are:

  • vector
    • GeoJSON (r,w)
    • ESRI Shapefiles (via GDAL) (r,w)
    • GPS eXchange (GPX) (r,w)
  • raster
    • GeoTiff (via GDAL) (r,w)
    • ESRI ASCII Grid (r,w)

Karta implements the Python `__geo_interface__ attribute <https://gist.github.com/sgillies/2217756>`__ for vector geometries. This permits data to be exchanged between Karta and external modules that also implement __geo_interface__ (e.g. shapely, fastkml).

Installation

The easiest way to install in production is via pip. Installation requires a recent version of setuptools:

pip install -U setuptools

Then, to install the latest release from PyPI:

pip install karta

Building from source

Building from source requires Cython:

pip install Cython

Then, clone the repository and install:

git clone https://github.com/fortyninemaps/karta.git karta
pip install -r karta/requirements.txt
pip install karta/

Dependencies

  • numpy >= >1.7
  • gdal >= 1.10
  • pyproj >= 1.9
  • blosc >= 1.2
  • C99-compliant compiler

Karta supports Python 2.7 and Python 3.4+.

Release History

Release History

0.7.4

This version

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0.7.3

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0.7.2

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0.7.1

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0.7

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0.7b1

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0.6.1

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0.6

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0.5.4

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0.5.3

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0.5.2

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0.5.1

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0.5.1.dev0

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0.5.0

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0.5.0b1

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0.5.0a0

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0.4.6

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0.4.5

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0.4.4

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0.4.3

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0.4.2.4

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0.4.2.3

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0.4.2.2

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0.4.2.1

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0.4.2

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0.4.1

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0.4.0.2

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0.4.0.1

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0.4.0

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0.4.0b5

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0.4.0b4

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0.4.0b3

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0.4.0b2

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0.4.0b

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0.3.0

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0.2.4

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0.2.3

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0.2.2

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0.2.1

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0.2.0

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0.1.0.2

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0.1.0.1

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0.1

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Download Files

Download Files

TODO: Brief introduction on what you do with files - including link to relevant help section.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
karta-0.7.4.tar.gz (1.1 MB) Copy SHA256 Checksum SHA256 Source Oct 12, 2016

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