comparing linestring

Hi,
I received a data set (water courses) of linestrings. This
data set was weeded out by removing some vertices to make
the linestrings smoother. Other data has since been placed atop
of this modified set.
However, the client wants us to use the original data set
vertices.
I now need to identify which vertices have been removed using
the new modified file versus the original watercourse file.
Is there a procedure or a process that would help me to
identify these vertices?

thanks in advance for any help.

John Celebre

 

John,

There are a couple of commercial apps out there to compare files.
Axiom has a good one.
If you merged the two files together, I suppose you could use
Microstation's DELDUP.ma to generate a report of duplicates.
Basically, you are looking for elements that are NOT duplicate, which
would be the ones changed.

However, I would probably end up writing an app to do this.
It also depends on what information you really need.
Do you want to know what elements have had vertices removed?
Or do you want to know what vertices were removed?
What do you plan on doing with the information?

I am unaware of an existing application to give you this information.

Gerald

 

Dear John
Try this site :http://home.comcast.net/~hksys/download.html and look
for dgncompr307. It can compare differences between dgn's and write
them to another dgn. Mayby that is wath you need.

Greetings Chris Blauw

 

Gerald
Thanks a lot for responding. I need to locate the vertices
that have been removed so that I can modify our "new data set" to
match the original linestrings vertices.
So just locating where the new vertices don't match the
original vertices would be enough to do the job.
thanks again,
John Celebre

 

Dear Chris
Thanks a lot for responding. I went to the link, but when I
clicked on the utility "dgncompr307" it responded with:
"action canceled - IE unable to link to web page".
I have used this site before, but it appears inactive
presently. Where you able to access the "downloadable files"?

thanks again
John Celebre

 

Try:

http://home.comcast.net/~hksys/

Geoff Houck

 

How about just referencing one data set file to the other data set file,
turning on level symbology and setting the level symbology of each file to
different colors. then just visually looking at the differences (turn off
level with other elements on them).

 

Kents idea is well illustrated here:
http://www.askinga.com/article.asp?ArticleID=88

 

Using that you might want to change reference update sequence
REFERENCES>SETTINGS>UPDATE SEQUENCE