Contents
- 1 What is a multipolygon instance in SQL Server?
- 2 How is a polygon formed in SQL Server?
- 3 How is the geometry data type implemented in SQL Server?
- 4 What makes a multipolygon instance an accepted polygon?
- 5 How many tags are there in a multipolygon?
- 6 How is the multipolygon relation used in real life?
What is a multipolygon instance in SQL Server?
Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance A MultiPolygon instance is a collection of zero or more Polygon instances. The illustration below shows examples of MultiPolygon instances.
How is a polygon formed in SQL Server?
APPLIES TO: SQL Server Azure SQL Database Azure SQL Data Warehouse Parallel Data Warehouse. A Polygon is a two-dimensional surface stored as a sequence of points defining an exterior bounding ring and zero or more interior rings. A Polygon instance can be formed from a ring that has at least three distinct points.
Is the interior of a polygon valid in SQL?
In the following example of a Polygon, the interior and exterior rings overlap and the instance is not valid. In the following example, the invalid instance is made valid with MakeValid ().
How is the geometry data type implemented in SQL Server?
The planar spatial data type, geometry, represents data in a Euclidean (flat) coordinate system. This type is implemented as a common language runtime (CLR) data type in SQL Server. The geometry type is predefined and available in each database.
What makes a multipolygon instance an accepted polygon?
A MultiPolygon instance is accepted one of the following conditions is met. It is an empty MultiPolygon instance. All instances comprising the MultiPolygon instance are accepted Polygon instances. For more information on accepted Polygon instances, see Polygon. The following examples show accepted MultiPolygon instances.
When does an area need a multipolygon relation?
Any area that is more complex than that (e.g., because its outline consists of several ways joined together, or because the area consists of multiple disjoint parts, or has holes) requires a multipolygon relation.
At least one tag describing the kind of feature (such as natural, landuse, building, man made, amenities, leisures, pedestrian areas, waterbanks…) covering that area.
How is the multipolygon relation used in real life?
The multipolygon relation is used to represent complex areas. tag info [More…] 26 505 502 members. Relations of type multipolygon are used to represent complex areas with holes inside or consisting of multiple disjoint areas.
Is the multipolygon in Osmose a valid polygon?
According to Open Geospatial Consortium’s (OGC) OpenGIS rules, this is not a valid polygon. It will create an error note in the Osmose quality assurance tool. More examples of valid multipolygon on the page Multipolygon Examples. The drawing style is always taken from the tagging of the relation itself.