[Imports] Administrative Boundaries and Divisions in Portugal

Andrew Guertin andrew.guertin at uvm.edu
Tue Apr 14 17:24:41 UTC 2015

On 04/13/2015 06:38 PM, Greg Troxel wrote:
> Christoph Hormann <chris_hormann at gmx.de> writes:
>> Since the myth that all or nearly all political boundaries are defined
>> through coordinates is frequently brought up in OSM context a few
>> things to keep in mind:
>> There are three common types of boundary definitions:
>> * definition through point coordinates and geodetic lines between
>> * definition through physical geographical features like rivers or
>> ridges
>> * definition through a mathematical formular based on either coordinates
>> or physical features - this is primarily for maritime boundaries.
> and a fourth (perhaps not true for international boundaries): town
> boundaries in Massachusetts are primarily defined by granite markers.

A fifth: references to other borders

a) borders of larger entities
      The town border continues until it hits the state border, then
      turns and follows the state border...
b) borders of smaller entities
      The town border goes along the border between Alice's land and
      Bob's land...

See http://legislature.vermont.gov/statutes/section/24APPENDIX/003/00001 
for an example of b) style.

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