joshmarcus / raster-stats

Sinatra app to calculate intersection between polygons and rasters.

raster-stats

Sinatra app to calculate intersection between polygons and rasters.

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

Place your raster on /raster/input/ Browse to http://localhost:9393/upload/RASTERNAME

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 ] ] ] } }]}

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.