Links for Chapter 2

Location and Space


Footnote 1

As marketing copy, this one is always already out of date. As of September 2023, the most direct reference to location on the Esri website is to be found here:

Footnote 6

ScapeToad is still at (yes http, not https).

Footnote 8

The TopoJSON format specification is at

Footnote 9

The GeoJSON format specification is at

Footnote 10

You can experiment with the GeoJSON format at

Footnote 11

David Theobald’s bewildered comment about the rendering speed of shapefiles is in an article in ArcUser entitled ‘Understanding topology and shapefiles’:

Footnote 14

The PostGIS project home page:

© 2023 David O’Sullivan