About Selecting Layers/Data Sets
Selecting a layer or data set defines the features that are used to
classify
LIDAR points. The selection
can be an existing layer in the map or a data set that you navigate
to using a file dialog.
The layer or data set can be a point, line, or polygon type. The specific
type selected determines the
spatial
relationships that can be applied toward points in the classification.
For example: point and line types only support the "within distance"
relationship where as, polygon types support "within distance"
as well as the "completely within" relationship.
Performance Tip
Polygon and polyline data sets that contain features with large numbers
of vertices can produce very slow classification times. This is due
to the number of cycles the program must make over the feature geometry's
vertices when determining if points meet your defined spatial relationship.
The program may seem to be hung or stalled but is working and will
eventually finish. A workaround to produce better performance is to
clip the data set to a tile data set. This produces smaller geometries
that have significantly fewer vertices resulting in less cycles the
program must make when determining if points meet your spatial relationships.
Consult ArcGIS Documentation for help on clipping data sets to tile
data layers for further assistance.
