One problem with this app is that these are flatworld bearings
and quickly become inaccurate with distance from origin. A better
way to do this would be to calculate Great Circle azimuths. You
can get these equations at
http://www.best.com/~williams/avform.htm.
- Bill Thoen
Michael Jenne wrote:
> Woody,
> Go to the shareware files at the MapInfo-L Clearinghouse site
> (run by the esteemed Bill Thoen) and download Bearing.zip.
> It's a little application that should fit the bill. The
> program description is:
>
> "Displays compass bearing, distance and beginning and ending
> points of a line drawn in a mapper window. The bearing angle is
> in degrees, from 0-360, where zero is facing true north.
> Program runs on MapInfo 4.02 and later, and includes MB and
> MBX. "
>
> The MapInfo-L site URL is:
>
> http://www.ctmap.com/mapinfo/
>
> Hope this helps. Good luck!
>
> Mike Jenne
>
> Trade or purchase USGS DRG maps at:
> Digital Raster Graphic (DRG) Topographic Map Exchange
> www.pipeline.com/~jcsi-maps/drgs
>
> At 10:09 AM 4/30/99 -0400, ZONING ADMINISTRATOR wrote:
> >I need to determine the angle of an existing line. COGO MBX
> allows us
> >to draw lines at a specific angle, but the info tool only
> gives us the
> >X1, X2, Y1, Y2. I do not have Map Basic, but can use the MB
> Window. Is
> >there an OBJGEOGRAPHY statement or similar approach, perhaps I
> could
> >create a new colomn for angle based on an SQL?
> >
> >Please help me with this brain teaser so I can update parcel
> maps where
> >legals describe angles off of existing lines for which I do
> not know
> >their angular component.
> >
> >- Woody
>
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