Drawing Geodetic Data

TPC includes tTPC includes tools to draw geodetic survey data. This includes carrying true bearings through geodetic positions and plotting the equivalent CRS coordinates so that East-West lines appear curved in the drawing to accomodate any latitudinal arc plus the ability to plot geodetic ground distances at the project elevation.

Drawing Settings

In TPC, you set the Miscellaneous Drawing Settings to draw true bearings and geodetic ground distances.

1. From the Drawing View choose Tools | Drawing Settings and left click the Miscellaneous tab.
2. From the Units pulldown list, select the distances units you want to display. Typically, your survey will be in feet, but you may want to display chains to match the GLO notes.
3. From the Distance pulldown list, select 'Geodetic Distance (at project elevation = 1,500 PLSS)'. The elevation displayed in the list will match the project elevation you set in the CRS dialog.
4. From the Direction pulldown list, select 'True Bearing (mean course convergence PLSS)'.

When you return to the drawing, TPC will use your selections to redraw the survey line annotations. If you are using curve or line tables, they will be updated to reflect your selections.

Reporting the Distance and Direction Types in the Drawing

As an aid to those who will use your drawings in the future, TPC allows you to clearly identify what distances and directions you have selected to annotate your drawing. It does this by providing a text variable that takes the description from the pulldown lists you used above and places that text in your drawing.

1. From the Drawing View choose Draw | Text.
2. Following the prompts for this command, left click a starting point for the text insertion they type $DISTANCETYPE and press Enter twice.
3. Repeat steps 1 and 2 above, this time typing $DIRECTIONTYPE.

Once the text is inserted, you can move them to an appropriate spot on the drawing and modify their properties.

Reporting the Distance and Direction Types in the Drawing Data Manager

If you open the Drawing Data Manager for this drawing, you will see the Distance and Direction types added along with rotation and scale.