Procedures for drafting maps for subsequent ArcInfo (ArcScan) scanning

1. Use a sheet of mylar that has fiducial marks which are registered to the topographic base. Do not draft directly onto a mylar sheet that contains the topographic base.
2. Draft all lines using a 3x0 pen. This includes both lithologic contacts and faults.
3. Structural axes (e.g., anticlines, synclines, etc.) should go on a separate mylar that is, in turn, registered to the topographic base and similarly should be drafted with a 3x0 pen. Plunge symbols (arrowheads) and definer symbols (which define the type of structure, such as the anticline arrows <---->, and syncline arrows ---><---) should go on a separate sheet as well. (The purpose of this is to develop mylar sheets which contain only lines that will be scanned. We don't want arrows to be on the mylars that are to be scanned because they will interupt the process of converting the structural axis lines into vectors.)
4. Make sure none of the drafted lines taper at the ends. Apply constant pressure to the pen along the entire length of each line you draft.
5. Draft all lines solid (i.e., no dashed lines, no dotted lines). The symbology for the type of line (fault vs. contact), and the relative certainty (dashed, dotted) will be added within ArcInfo.
6. Make lines terminate cleanly against another line where appropriate. Do not leave gaps between lines if the things on the ground (faults, contacts) really do touch one-another. Also, don't over-shoot one line a short distance across another unless that's really how the things on the ground are spatially related.
7. Draft marker symbol locations (e.g., strike-and-dips) and text (e.g., lithologic unit symbols and dip magnitudes) on a separate mylar. These features will not be scanned but, rather, their locations will be digitized on a drafting board and the associated text will be entered manually.

   To expedite this process you can determine the longitude/latitude of each feature and write each of those coordinates to a file along with the associated text or measurement. For example you could generate a file containing comma-delimited records of strike and dip coordinates, orientation, and angle as such:

                -118.55431,34.56537,275,20SW 
             

   And you could generate a file containing the locations of formation symbols and coordinates:

                -118.50024,34.56018,Qt 
             

8. Precisely draft at least 4 tic-marks (+) as intersecting lines (each line being at least 1/2 inch long) on the periphery of the map at known earth coordinates (e.g., longitude/latitude). Preferably these would be where tic marks exist on the source map. Use a 4x0 pen to draft these lines.