The geojson-types package

[Tags:bsd3, library]

Provides data types, lens operators and (de)serialization of GeoJSON data to/from JSON and BSON using aeson and bson.

This library uses a the lens library a lot. It provides Iso / Prism to convert from and to GeoJSON objects.

e.g. to convert a latitude/longitude given as a pair of Double to a Position, use the _Position Iso as a Getter on that pair:

 _Position :: BaseType t => Iso' (t, t) (Position t)

 pos :: Position Double
 pos = (57.324, 7.2342) ^. _Position

to then convert it to a Point object use _Point:

 _Point :: Iso' (Position t) (GeoJSON Point t)

 p :: GeoJSON Point Double
 p = pos ^. _Point

 ps :: GeoJSON MultiPoint Double
 ps = [p,p,p,p] ^. _MultiPoint

The library also provides type classes for working polymorphic over user defined data types.

e.g. for a data type:

 data Location =
   Location
     locationName :: String,
     locationLat :: Double,
     locationLon :: Double

one can implement the type class HasGeoJSON to provide a Getter to a any GeoJSON object. In this example a Point.

 instance HasGeoJSON Point Double Location where
  geoJSON = to $ \loc ->
    (locationLat loc, locationLon loc) ^. _Position . _Point

Properties

Versions 0.1, 0.1.1, 0.1.2, 0.1.3
Dependencies aeson (>=0.11), base (==4.8.*), bson (>=0.3), bytestring (>=0.10), lens (>=4.14), text (>=1.2) [details]
License BSD3
Copyright Copyright (c) 2016 Markus Barenhoff
Author Markus Barenhoff
Maintainer Markus Barenhoff <mbarenh@alios.org>
Category Data
Home page https://github.com/alios/geojson-types/
Bug tracker https://github.com/alios/geojson-types/issues
Uploaded Mon May 16 18:00:42 UTC 2016 by alios
Distributions NixOS:0.1.3
Downloads 136 total (4 in the last 30 days)
Votes
0 []
Status Docs available [build log]
Last success reported on 2016-05-16 [all 1 reports]

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