Hello again,
Thanks to all who responded to my posting on the DWG to TAB translation problems I
have seen. I did some testing on some of the suggestions and thought I would share my
results.
I took a simple AutoCAD 14 drawing containing several entities, created at real world
dimensions in an XY position corresponding to the general area of work we perform. We
work in NAD83 State Plane, Washington North Zone, so an XY of 1800000,145000 is
common. I created a simple arc, a pline arc, and a small polygon with 100' sides and
a 25' fillet arc in one corner, and some simple text. I saved the drawing in several
formats, DWG 12, 13 and 14 and DXF 12,13 and 14. I then tried several
import-translation procedures.
1) I used Universal Translator to bring in the DWG. The results for the 3 DWG
versions were the same. The simple arc was the cleanest, resulting in a Mapinfo arc,
no chords or distortion. The pline arcs were less clean. I got chords of fairly even
spacing on the individual pline arc (which was a radius of about 151'), but very
differing chord lengths on the small 25' arc that was part of the closed polygon.
This resulted in a figure that looked fine from a distance, but looked like a jagged
saw cut as you zoomed in. The text came over fine in all versions.
2) I used UT to translate the DXF versions. There was no difference from the DWG
versions. They produced the same results.
3) I used Table Import to bring in the DXF versions and found that the simple arc
became a polyline with chords. They were uniform chords, however. The polyline arcs
produced similar results from the UT translation, that is, uniform chords on the large
arc, but saw cut chords on the small arc. The saw cut chords were just in different
areas than the ones from the UT translation.
It appears that Mapinfo is going to convert a pline arc in Autocad to a chorded
polyline no matter what procedure you use. To test this, I took one of the clean
simple arcs and combined it with a polyline created in Mapinfo, then made a region of
the result. I ended up with a chorded polyline. I really have no major problem with
this, but I would like to end up with a more uniformly chorded polyline in the smaller
arcs.
Just for your info...
Thanks again,
Bruce Dawson PLS
Douglas County TLS
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