PolygonType¶
A closed plane figure bounded by three or more line segments, representing a geographic area. Contains either the URI of the file containing the polygon, a specific link code for the shape within the file, and a file format, or a minimum of 4 points to describe the polygon in-line. Note that the first and last point must be identical in order to close the polygon. A triangle has 4 points. A geographic time designating the time period that the shape is valid should be included. If the date range is unknown use a SingleDate indicating a date that the shape was known to be valid.
Properties¶
Name |
Type |
Description |
|
|---|---|---|---|
ExternalURI |
anyURI |
0..1 |
Note that ExternalURI points to the boundary file location. |
PolygonLinkCode |
string |
0..1 |
The PolygonLinkCode is the identifier of the specific polygon within the file. For example in an NHGIS file the LinkCodeForPolygon for Tract 101.01 in Hennepin County in Minnesota is 2700530010101. |
ShapeFileFormat |
0..1 |
The format of the shape file existing at the location indicated by the sibling ExternalURI element. |
|
Point |
4..n |
A geographic point defined by a latitude and longitude. A minimum of 4 points is required as the first and last point should be identical in order to close the polygon. Note that a triangle has three sides and requires 3 unique points plus a fourth point replicating the first point in order to close the polygon. |
