Roadway Symbology Extension.

The extension allows the user to label road segments by reading two field values from the 
active theme.  One field represents the road classification and one field represents the 
road number. The program does look for defaults. They are:

ROAD_CLASS  =  Road classification value
ROAD_NUM = Road designation

If these fields are not found then the program will request the fields from the user.

Different road symbols are displayed based on the following road classifications:

Value	Road Class	Symbol
===============================
1	Interstate	shield
2	Federal Highway	shield
3	State Highway	square
4	County Roads	circle
5       ?               Diamond
6	?		Triangle
7	?		Pentagon
8	?		Octagon

The road numbers are then read from the ROAD_NUM field and placed in the center of the 
symbol. These road numbers can contain alpha-numerics but must be 3 characters or less in 
length.

The application adds two new buttons and one new tool in the view document interface
The buttons do the following:

a) Batch symbol processing for segments in the active theme. You will be asked to enter 
a minimum line length to symbolize. This helps weed out short segments that don't need 
to be symbolized. All lines longer than the input length will be symbolized at the center 
of the line.

b) Initialize the symbol fields and the symbol size. Use this option to specify fields 
and to specify symbol size.

Symbol size is specified in points (72 per inch) and scaled to a particular map scale.
Thus, if you are printing a map at 1:24,000 scale and you want the symbols to be 1/10 of
an inch you would set the font  size to 7.2 (72/10) at 1:24,000 scale.

Each symbol added is attached to the active theme which should be a line theme that
represents roads of some kind.

The tool added is an interactive symbol placement tool. You should see it as the right-most
tool in the toolbar. Just press the tool and select the line you want to symbolize and the
road_class value will be read and the appropriate symbol placed at that point with the
road designation from the road_num field.

You will need to load the font (roadsym.ttf) using the Font manager for your specific 
version of windows.


Known Problems

1) For some reason the symbols are not  persistent. That is, after you place some symbols 
and you save the project and exit ArcView, the next time you open the project the symbols 
are not right. To fix this you can select all the graphics and then use the symbol palette 
to change the font to the DNR Roadway Symbols font. Once you do that the symbols are 
persistent and stay the way you expect them to.

2) This application does not function on the UNIX version of ArcView.