https://github.com/springmeyer/couchdb-mapnik

sample setup for rendering geojson polygons out of couchdb
https://github.com/springmeyer/couchdb-mapnik

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sample setup for rendering geojson polygons out of couchdb

• Host: GitHub
• URL: https://github.com/springmeyer/couchdb-mapnik
• Owner: springmeyer
• Created: 2011-05-26T06:45:32.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2011-05-26T07:23:12.000Z (over 13 years ago)
• Last Synced: 2024-11-04T06:35:20.491Z (about 1 month ago)
• Homepage:
• Size: 426 KB
• Stars: 9
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# CouchDB & Mapnik

## Requirements

 * Couchdb - I tested with CouchDBI Version 1.0.2.0.

 

 * GDAL trunk (>= 1.9.0) with couch support (http://www.gdal.org/ogr/drv_couchdb.html)

 * Mapnik trunk (>= 2.0.0) with OGR plugin (http://trac.mapnik.org/wiki/OGR)

 

 * nik2img.py - optionally for easy rendering via command line (http://trac.mapnik.org/wiki/Nik2Img)

## TODO

 * Track down the cause of this warning:

```

ERROR 1: FetchNextRowsSpatialFilter() failed : not_found, missing handler: _spatial

```

 * Add support for geocouch (which will likely remove the above warning)

## Usage

Create a couch document for a given shapefile:

    ogr2ogr -lco UPDATE_PERMISSIONS=ALL -f couchdb couchdb:http://127.0.0.1:5984 world_merc.shp

Then query the document to make sure the geojson is in there:

    ogrinfo couchdb:http://127.0.0.1:5984/ -so -al world_merc

You should get:

```

$ ogrinfo couchdb:http://127.0.0.1:5984/ -so -al world_merc

INFO: Open of `couchdb:http://127.0.0.1:5984/'

      using driver `CouchDB' successful.

Layer name: world_merc

Geometry: Polygon

Feature Count: 245

Extent: (-20037508.342789, -8283343.693883) - (20037508.342789, 18365151.363070)

Layer SRS WKT:

PROJCS["Google Maps Global Mercator",

    GEOGCS["GCS_WGS_1984",

        DATUM["WGS_1984",

            SPHEROID["WGS_84",6378137,298.257223563]],

        PRIMEM["Greenwich",0],

        UNIT["Degree",0.017453292519943295]],

    PROJECTION["Mercator_2SP"],

    PARAMETER["standard_parallel_1",0],

    PARAMETER["latitude_of_origin",0],

    PARAMETER["central_meridian",0],

    PARAMETER["false_easting",0],

    PARAMETER["false_northing",0],

    UNIT["Meter",1]]

_id: String (0.0)

_rev: String (0.0)

FIPS: String (0.0)

ISO2: String (0.0)

ISO3: String (0.0)

UN: Integer (0.0)

NAME: String (0.0)

AREA: Integer (0.0)

POP2005: Integer (0.0)

REGION: Integer (0.0)

SUBREGION: Integer (0.0)

LON: Real (0.0)

LAT: Real (0.0)

```

Then try rendering with nik2img:

    # install first

    sudo easy_install nik2img

    

    # then render

    nik2img.py couchmap.xml world.png

# Thanks

[Even](http://even.rouault.free.fr/) is the humble but brilliant fellow who added couch support to OGR virtually overnight.