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| GeoCommunity Mailing List |
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| Subject: | GISList: Conflation Confusion Conclusions... |
| Date: |
01/29/2003 08:48:08 AM |
| From: |
Lega, Robert |
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Hi all.... I received many response to my question about conflating point =
attributes to polygon features. Mostly these came in the form of essential=
ly rebuilding the poly coverage using the point cover. This would have bee=
n the best way to proceed if, however all my points landed inside its own c=
orresponding poly. But, as you all know, things just are not that easy, mo=
st of my points were outside polys, many polys contained multiple points, a=
nd other scenarios that you can imagine.=20=20
I'd like to thank Jeff Hankley who suggested:
"In ArcEdit, try making your polygon coverage the edit coverage and your e=
ditfeature label, delete the existing labels (if there are any) and do a "g=
et" on labels from your point coverage. Quitsave, and build polys."
Also Chris Markel deserves my thanks for this response:
"I would think the Identity overlay function in Arc Workstation would allow
you to do this. I think it would work whether you have one point per
polygon, or several points per polygon - I think Identity will output points
with the polygon attributes of the polygon they fall in. Transferring the
attributes of several points to one polygon presents you with the
many-to-one problem, however."
Jason MacEachern, thanks for your suggestion:
"If you are sure that each point will fall within one polygon (i.e. 1-to-1 =
relationship) you could use the IDENTIFY command possibly.=20
IDENTIFY my_pt_cov my_poly_cov my_new_poly_cov POLY # JOIN
will create a new polygon coverage with all the attributes from the input c=
overage joined to the output coverage where they overlap."
And lastly James Graham, thanks for your response as well.
And as you can see each of the above responses required that all of my poin=
ts land inside a polygon, which is not the case. So what I ended up doing =
was using the GNIS Point conflation procedures from NHDinARC, with a slight=
modification, which allowed a radiated perimeter around each point at succ=
essive intervals. It worked great, and even created a Q that allowed me to=
verify each of the multiple radiated points to multiple polys.
Good luck...and thanks again
RSL
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