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GeoJSON (.geojson)

Background & Context

    • MIME type: application/geo+json.
    • GeoJSON GIS format.
    • Geospatial data interchange format based on JavaScript Object Notation (JSON).
    • Open standard format for representing simple geographical features.
    • GeoJSON identifies GeoJSON objects with list of rules in the Wolfram Language.
    • GeoJSON is specified by RFC 7946.

Import

Import Elements

  • General Import elements:
  • "Elements" list of elements and options available in this file
    "Summary"summary of the file
    "Rules"list of rules for all available elements
  • Data representation elements:
  • "Data"rule-based representation for each feature of the GeoJSON archive
    "Graphics"all geometric features combined into a single GeoGraphics object
    "GraphicsList"list of graphics representing the geometric features of a GeoJSON archive
  • Import by default uses the "Graphics" element for the GeoJSON format.
  • Spatial information elements:
  • "CoordinateSystem"name of the coordinate reference system
    "SpatialRange"range of geographic coordinates, typically given in decimal degrees
  • Low-level meta-information from the file:
  • "CoordinateSystemInformation"raw parameters of the coordinate reference system

Options

  • Export options:
  • "Compact"Falsewhether to omit line breaks and tabs

Examples

open allclose all

Basic Examples  (3)Summary of the most common use cases

Import the contents of a GeoJSON file:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-uzt3x
Out[1]=1

Export a GeoGraphics object as a GeoJSON file:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-1jigqu
Out[1]=1
In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-jq8ie1
Out[2]=2

Import the GeoJSON file:

In[3]:=3
✖
https://wolfram.com/xid/0xayhn0jk7ic-hec6tl
Out[3]=3

Print the GeoJSON code:

In[4]:=4
✖
https://wolfram.com/xid/0xayhn0jk7ic-yq4k69

Read a GeoJSON file as a string:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-ptbb0d
Out[1]=1

Import the string and interpret it as a GeoGraphics object:

In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-ndez67
Out[2]=2

Scope  (6)Survey of the scope of standard use cases

Export a GeoGraphics map as a GeoJSON file:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-5gbph5
Out[1]=1
In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-03h994
Out[2]=2

Import the file:

In[3]:=3
✖
https://wolfram.com/xid/0xayhn0jk7ic-k6h9m4
Out[3]=3

Export a GeoGraphics object as a string using the GeoJSON format:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-kmg87u
Out[1]=1

Specify explicitly the GeoJSON format to export a GeoGraphics object to a JSON file:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-zsq39s
Out[1]=1
In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-tj6x4h
Out[2]=2

Import the file as pure JSON:

In[3]:=3
✖
https://wolfram.com/xid/0xayhn0jk7ic-i23uan
Out[3]=3

Import the file as GeoJSON:

In[4]:=4
✖
https://wolfram.com/xid/0xayhn0jk7ic-9itvy9
Out[4]=4

Export a GeoGraphics expression containing graphical directives, encoded as GeoJSON properties:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-p3q0mc
Out[1]=1
In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-8s6bxu
Out[2]=2

Import back the GeoGraphics data:

In[3]:=3
✖
https://wolfram.com/xid/0xayhn0jk7ic-r7phii
Out[3]=3

Import a particular element from a GeoJSON file:

In[4]:=4
✖
https://wolfram.com/xid/0xayhn0jk7ic-q0ahfc
Out[4]=4

Export GeoGraphics primitives and directives of different types:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-gcaown
Out[1]=1
In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-tgb2xm
Out[2]=2

Import the file:

In[3]:=3
✖
https://wolfram.com/xid/0xayhn0jk7ic-ioguvi
Out[3]=3

Give the list of possible elements to import from a GeoJSON file:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-o7eqq2
Out[1]=1

Import one element:

In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-bpbgzg
Out[2]=2

Import several elements:

In[3]:=3
✖
https://wolfram.com/xid/0xayhn0jk7ic-gerev
Out[3]=3

Import Elements  (4)

"Data"  (1)

The "Data" element returns the data in the GeoJSON file, interpreted as Wolfram Language expressions:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-1wnr1h
Out[1]=1

"Graphics"  (1)

Import the GeoGraphics version of a GeoJSON file:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-4ggijj
Out[1]=1

"GraphicsList"  (1)

Import a GeoJSON file as a complete GeoGraphics object:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-l0p9hv
Out[1]=1

Import a list of GeoGraphics objects for the respective geo primitives:

In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-0gfb7f
Out[2]=2

"SpatialRange"  (1)

Get the spatial range used in a GeoJSON file:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-n5pcmk
Out[1]=1

Compare to the GeoJSON specification of that geo range:

In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-qg9xay

That GeoJSON file contains only bounding box information, which is used when importing to GeoGraphics:

In[3]:=3
✖
https://wolfram.com/xid/0xayhn0jk7ic-nmhhun
Out[3]=3

Export Options  (1)

"Compact"  (1)

Return a compact form of the code by limiting indentation:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-9akcml
Out[1]=1

Applications  (1)Sample problems that can be solved with this function

Download earthquake data for the East Coast of the US:

In[1]:=1
✖
https://wolfram.com/xid/0xayhn0jk7ic-igz2gz

Export a GeoGraphics map of the data as a GeoJSON file, so that it can be used in other applications:

In[2]:=2
✖
https://wolfram.com/xid/0xayhn0jk7ic-f47h4a
Out[2]=2
In[3]:=3
✖
https://wolfram.com/xid/0xayhn0jk7ic-58diot
Out[3]=3

Verify the result, importing the "Data" element of the GeoJSON file:

In[4]:=4
✖
https://wolfram.com/xid/0xayhn0jk7ic-b7n65f
Out[4]=4

Import the GeoJSON file using a relief geo background, to show correlation with the topography:

In[5]:=5
✖
https://wolfram.com/xid/0xayhn0jk7ic-reg2uo
Out[5]=5