Interpreting wombling maps: point data

The layer types that appear are listed below; the name of each layer includes its boundary name (e.g. "Boundary 1: points"), though a few types have no suffix (e.g. "Boundary 1"). As the locations of candidate Boundary Elements vary between numeric and categorical point data sets, each type of boundary has some specific map layers.

You can view, customize, and query these maps as you would any other map in BoundarySeer.

Map layers

numeric data

1. "Boundary: points" is a point layer showing the locations of Boundary Elements (BEs, locations where Boundary Membership Value (BMV) = 1).

2. "Boundary: triangles" is a polygon layer showing the Delaunay triangulation. For crisp boundaries, Delaunay triangles with BMV = 1 appear in color. For fuzzy boundaries, this layer displays the "core boundary" triangles (in black), and the other locations that are in the boundary but not in the core (gray).

3. "Boundary: boundary links" is a line layer showing the subboundary connections between centroids of boundary elements.

categorical data

4. "Boundary" is a line layer showing the BEs. For categorical data, BMVs are determined at the Voronoi edges. When you delineate crisp boundaries, the layer shows the edges with BMV = 1 (see categorical wombling). If you do fuzzy categorical wombling, the edges that comprise boundaries are shown in different colors according to BMV.

all data types

5. "Boundary: B.L.V." is a layer showing the BLVs of all candidate BEs. For numeric data, it is a polygon layer similar to "Boundary: triangles" but illustrating BLV rather than BMV. For categorical data, it is a line layer.