On Tue, 25 Oct 2016, Dave Roberts wrote:
So now when I see "geometry" in a manual page or GRASS-user posting I interpret that to mean "vertices, nodes, centroids, and associated categories ordered by the (not necessarily consecutive) layer numbers" as that's the essential nature of a record in the coor file that manages all this.
Obviously that's more operational than conceptual so I was wondering where the concept of geometry is actually defined.
Dave, If I may contribute a thought or two to this thread: there are two definitions of 'geometry' which we all use. One definition is coordinate geometry which can be described as where points on a geographic surface are located; the x, y values. Then there's object geometry. When setting a dinner table it's common to place plates, glasses, and flatware in designated positions relative to each other. Same with the controls in a vehicle: the accelerator is on the right, the brake in the center and the clutch on the left (at least here in the US; it's been decades since I drove in the UK). If we think of GRASS' geometry as object geometry, the placement of vector objects relative to each other it might lessen any confusion. Rich _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
