Contents
What happens when you intersect two polygon classes?
The graphic below illustrates the result of intersecting two polygon feature classes with the Output Type parameter set to LINE. The output line features are where a polygon from one of the input feature classes share a common boundary (intersect at a line) with a polygon from the other input feature class.
How are polygons intersect in ArcGIS help 10.1?
This can be useful to discover polygon overlap and line intersections (as points or lines). Polygons can intersect in three ways: Overlap—Area of overlap can be produced by leaving the Output Type to its default value (LOWEST). Common boundary/touch at a line—This type of intersection can be produced by specifying LINE as the Output Type.
How to clip an overlaying polygon area from an underlying feature?
Using the Edit tool, select the overlaying polygon. Click the Editor drop-down arrow and select Clip. Leave the buffer distance set at 0.00. Under When Clipping Features, select Discard the area that intersects and then click OK. Delete or move the overlaying polygon. The underlying polygon has the overlaying polygon area clipped from the feature.
Where do lines touch on a polygon boundary?
The output point features are where line endpoints touch at a point on the polygon boundary and where lines cross polygon boundaries. No points are generated in the output where lines lie directly along polygon boundaries. The graphic below illustrates the result of intersecting point, line, and polygon feature classes.
How to merge multiple polygons into a single geometry?
The main SELECT query will be the following. This uses ST_DUMP to change the geometry from multipolygon to polygon, and in so doing dissolve overlapping polygons into a single unified geometry. Lastly, the resulting table does not have a primary key (or any attribute data), so adding an ID field that is a PRIMARY KEY is always a good idea.
What kind of geometry can be used in intersect?
The inputs can be any combination of geometry types (point, multipoint, line, or polygon). The output geometry type can only be of the same geometry or a geometry of lower dimension as the input feature class with the lowest dimension geometry (point = 0 dimension, line = 1 dimension, and poly = 2 dimension).
Can a RDMS clip, merge and dissolve polygons?
Although one could use shapefiles and clip, merge, and dissolve the contents, this would create several intermediate datasets. A good alternative is to use a spatial RDMS like PostGIS so that the whole process is reduced to a single query where the only output is a single table. Here’s how it works.
What does intersect at a line mean in ArcGIS?
The output line features are where a polygon from one of the input feature classes share a common boundary (intersect at a line) with a polygon from the other input feature class. The graphic below illustrates the result of intersecting two polygon feature classes with the Output Type parameter set to POINT.
What happens when you intersect two line feature classes?
The graphic below illustrates the result of intersecting two line feature classes with the Output Type parameter set to either LOWEST or LINE. The output line features are where a line from one of the input feature classes overlaps a feature from the other input feature class.
How to intersect lines and polygons in ArcGIS?
Intersecting lines and polygons. In many cases, a polygon or line feature class may contain numerous overlapping polylines, making attribution and simple vector editing difficult. The Intersect command can be used to intersect overlapping polygon or polyline features in the current selection. For example, two overlapping polyline features would…
How to intersect lines and polygons in R?
Following on from an answer about intersecting polygons with lines to chop up a polygon into smaller polygon units (in QGIS), I wanted to try the same thing in R. However, I cannot seem to find a method that works!
Can you create a polygon from a line?
If you have line features, you can create polygon features from them. For example, you might need to create parcel polygons from lot lines, lakes from shorelines, or street polygons from pavement lines.
When does the output feature class contain polygons?
If all inputs are polygons, the output feature class will contain polygons. If one or more of the inputs are lines and none of the inputs are points, the output will be line. If one or more of the inputs are points, the output feature class will contain points.
How are polygons intersect in ArcGIS for desktop?
Polygons can intersect in three ways: Overlap—Area of overlap can be produced by leaving the Output Type to its default value (LOWEST). Common boundary/touch at a line—This type of intersection can be produced by specifying LINE as the Output Type. Touch at a point—This type of intersection can be produced by specifying POINT as the Output Type.
What are the output polygon features in ArcGIS?
The output polygon features are where a polygon from one of the input feature classes or layer intersects a polygon from the other input feature class or layer. The graphic below illustrates the result of intersecting two polygon feature classes with the Output Type parameter set to LINE.