Suppose one wants to make polygons A and B, and their respective attributes to be one unique polygon C. What is this GIS operation called?
Is there any difference in GIS terminology about "joining" and "merging" geometries? Or does the terminology expand to different concepts besides geometries?
As an example, I could not find the answer reading tag wikis in GIS SE.
Currently, the excerpt and wiki of merge says:
In the context of GIS, merge typically refers to either
- combining two or more geometries into a new, single geometry
- combining the records of two different tables into a single table (similar to append)
- combining multiple raster files (stacked or adjacent) into one.
A specific type or method of merging is dissolve.
And the excerpt of joins states:
The process of connecting two or more datasets based on a common attribute or spatial location.
"Connecting two or more datasets based on a common attribute" seems to be the same as the second bullet in the merge wiki.