Skip to content

Latest commit

 

History

History
96 lines (65 loc) · 3.99 KB

README.md

File metadata and controls

96 lines (65 loc) · 3.99 KB
Raw

raster-stats

Rails app to calculate intersection stats between polygons and rasters.

Dependencies

Install Mapnik: (https://github.com/mapnik)

Install from packages

First, ensure add-apt-repository is installed:

sudo apt-get install -y python-software-properties

Mapnik v2.1.0

This is the latest in the 2.1.x series.

sudo add-apt-repository ppa:mapnik/v2.1.0 sudo apt-get update sudo apt-get install libmapnik mapnik-utils python-mapnik

These packages come from: https://launchpad.net/~mapnik/+archive/v2.1.0/+packages

Start it

bundle install
shotgun config.ru

The application will be running in port 9393: http://localhost:9393/stats/{polygon in GeoJSON}

Set up

Install starspan 1.2.06 or above (http://starspan.projects.atlas.ca.gov/). The 1.2.06 git repository is in https://github.com/Ecotrust/starspan. You may need GEOS <= 3.2 (http://trac.osgeo.org/geos/) and GDAL (http://www.gdal.org/) to install it.

Raster Management

If you want to upload a raster from an external server: Browse to http://localhost:9393/externalupload/

If you want to use a local raster: Browse to http://localhost:9393/internalupload/

The rasters are split into three folders, based on their resolution: high_resolution, medium_resolution, and low_resolution and it is created a json file on info/ folder.

Example

After starting the server, point your browser to:

http://localhost:9393/STATS/RASTERNAME/{"type": "FeatureCollection","features": [{ "type": "Feature", "id": 0, "properties": { "id": null, "name": 8, "AREA": 7435.85032686457 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -55.199133830905097, 14.166474645080788 ], [ -139.868730478081005, 21.093987098031544 ], [ -166.295907613411686, 80.619279286349169 ], [ -19.022124354384474, 82.671875568704948 ], [ -55.199133830905097, 14.166474645080788 ] ] ] } }]}

Replace STATS with "avg", "sum", "max" or "min".

Replace RASTERNAME with the name of the raster file including extension.

This example uses a massive polygon, so the application will use the low resolution raster.

License

Copyright (c) 2012, WCMC All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  • Neither the name of the nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

References

Rueda, C.A., Greenberg, J.A., and Ustin, S.L. StarSpan: A Tool for Fast Selective Pixel Extraction from Remotely Sensed Data. (2005). Center for Spatial Technologies and Remote Sensing (CSTARS), University of California at Davis, Davis, CA.