The geojson-types package

[ Tags: bsd3, data, library ] [ Propose Tags ]

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 205 total (6 in the last 30 days)
Rating 0.0 (0 ratings) [clear rating]
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Status Docs available [build log]
Last success reported on 2016-05-16 [all 1 reports]
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