How to create spatial polygons from a Dataframe?
I have a dataframe containing the coordinates of a set of polygons. This is how I would convert it to a spatialPolygons (package sp)
How to convert a line to a polygon?
For converting lines to polygons, see also st_polygonize below. convert from XX to MULTIXX, e.g. LINESTRING to MULTILINESTRING convert from MULTIXX to XX if MULTIXX has length one (else, it will still convert but warn about loss of information)
How to reduce the size of a SFC?
Just to make the point, we can for instance rotate the counties of North Carolina 90 degrees clockwise around their centroid, and shrink them to 75% of their original size: The coordinate reference system of objects of class sf or sfc is obtained by st_crs, and replaced by st_crs<-: an alternative, more pipe-friendly version of st_crs<- is
How to dissolving polygons in ArcGIS with SF?
Consider counties by two groups in ArcGIS. The ArcGIS dissolve command yields two polygons, regardless of the fact that the eastern peninsula consists of additional separate polygons. Like so: This is the functionality I’d like to replicate in sf, however I cannot as demonstrated below.
How to separate a multipolygon geometry into several polygons?
As mentioned by Edzer performing an st_cast converts the MULTIPOLYGON object into several POLYGON objects: Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers.
How are polygons defined in ArcGIS Simple Feature Access?
I am not too familiar with how ArcGIS defines a polygon, but the simple feature access (an ISO standard) specification of a polygon is a single ring with zero or more inner rings denoting holes. This means that under that specification, if you have the main land + a couple of islands, you don’t have a single polygon.