PostGIS ST_Intersection of polygons can return lines

What is the difference between ST_Overlaps and ST_Intersects?

Use ST_Intersects to determine whether two geometries intersect. Use ST_Crosses to determine whether one geometry crosses another. Use ST_Overlaps to determine whether two geometries of the same dimension overlap.

How does St_ intersection work?

The ST_Intersection() function takes two ST_Geometry objects and returns the intersection set as an ST_Geometry object. If the two objects do not intersect, the return value is an empty geometry.

What is overlapping polygons in geometry?

For polygon geometry, any area that is occupied by two or more features is considered an overlap. For line geometry, only lines that overlap completely (a line segment is incident with another line segment) are considered overlapping. Lines that intersect at a point are not considered overlapping.

What is the difference between ST_Union and ST_Intersection?

ST_Intersection(geometry A, geometry B): Returns a geometry that represents the shared portion of geomA and geomB. The geography implementation does a transform to geometry to do the intersection and then transform back to WGS84. ST_Union(): Returns a geometry that represents the point set union of the Geometries.

What is the difference between ST_Intersects and ST_Contains?

ST_Intersects()



This function determines whether or not two geometries share the same space in any way. Unlike ST_Contains(), which tests whether or not one geometry is fully within another, ST_Intersects() looks for intersection between any parts of the geometries.

What is the difference between ST_Within and ST_Contains R?

In colloquial terms, ST_Contains determines whether the first geometry given to it encloses the second geometry (whether the first contains the second). ST_Within determines whether the first geometry is completely inside the second (whether the first is within the second).

How does the intersect tool work?

The Intersect tool calculates the geometric intersection of any number of feature classes and feature layers. The features, or portion of features, that are common to all inputs (that is, they intersect) will be written to the output feature class.

How does intersect work in Solidworks?

You can intersect solids, surfaces, or planes to modify existing geometry, or to create new geometry with the Intersect tool. For example, you can add open surface geometry to a solid, remove material from a model, or you can create geometry from an enclosed cavity.

What does the intersect function do?

SQL INTERSECT operator combines two select statements and returns only the dataset that is common in both the statements. To put it simply, it acts as a mathematical intersection. In mathematics, the intersection of A and B is the common data present in both A and B.