Target layer: Polyline

Description:  If switched ON analyzes the nodes of the polylines visible in the view after each refresh of the screen and draws nodes classified by their valence. The symbols for the different types of nodes can be set in the ET GeoTools Control Panel - Draw Tab. The user can adjust also the maximum number of visible features  for which the nodes will be analyzed and drawn automatically after each operation that triggers screen refresh. If the visible features are more than the user specified amount, the command is automatically turned off. The default value for the Max Features Auto Redraw is 1000 features. This should work fine on an average PC, but it is entirely up to the user to set this value to any number if it does not slow down the refreshing of the screen. In the Control Panel the user can set also which nodes to be drawn

• Regular Nodes - nodes in which three or more polylines intersect
• Pseudo Nodes - nodes in which only two polylines meet
• Dangling Nodes - nodes with only one pertaining polyline

Advantages: 

• The command allows visualization of the topological relations between the polylines, identifying problems in the topology. Use the tools available in ET GeoTools (Intersect, Clean Dangles, Extend, Clean Pseudo Nodes etc.) to fix such problems.  
• It is not dependant on the Topology introduced in ArcGIS 8.3 and can be used in any version of ArcGIS 8.1 and above
• Can be used with any license (ArcView, ArcEditor or ArcInfo)

IMPORTANT NOTE:

In ArcGIS 9.2 a per feature class XY Tolerance was introduced when working with geodatabase feature classes. From ArcGIS documentation about the XY Tolerance:

"It  is used to resolve inexact intersection locations of coordinates during clustering operations" 

This however sometimes creates problems after very simple editing of the data. The Draw Nodes tool has two options for comparing coordinates:

• Using the precision of the feature class
• Using the true coordinates

In most of the cases we recommend using the precision of the feature class, but if you finalize data for export to other packages you can select the "Use true coordinate comparison" option in the ET GeoTools Control Panel - Draw Tab. If there are some dangling nodes that are not displayed when using the precision of the feature class option you might try to rectify them using the Clean Polylines command.