[mapserver-users] combine objects (was Rosa and CGI)

[Lowell.Filak]

Sorry about that. For lack of a better term(s): the "in" would be the two
polygons you want to join and the "out" would be the single shape that is
a result of the joined polygons.
Great information and points. I will be interested to see what other CGI
users have as solutions.
Lowell F.

On Tue, 14 May 2002, Richard Greenwood wrote:

> At 01:26 PM 5/14/2002 -0400, you wrote:
> >Could a feature join be done in mapscript? Theoretically I believe yes,
> >because the nature of a shape is more like a region than it is a polygon.
> >However
> >I have not tried combining two "in" shapeObjects into a single "out"
> >shapeObj.
>
> You lost me there - what is an "in" and an "out" object?
>
> >A step back may be required at this point to see if joinning the
> >shapes will cause more of a problem then it is worth. For example: if you
> >have two parcel polygons that both share a common parcel identifier but do
> >NOT share a common acreage you can not combine the individual polygons
> >into a single "shape" without loosing one of the distinct acreages or
> >combining the two acreages together before assigning the new acreage
> >value. If the CGI version does require a single record you may want to
> >look at using mapscript to handle the many-to-one or many-to-many
> >relationships.
>
> Yes, good point. I am always struggling with the one-to-many relationship
> problems associated with parcel mapping. With the CGI version of mapserver,
> I found it necessary to aggregate multi-polygon parcels into single objects
> so that if I queried for a parcel I only got one object back to map. e.g.
> If I have a multi-polygon parcel X and did an itemquery on X (like an
> address look up), I got back each polygon as a separate map (not what I
> wanted), so I aggregated all my multi-polygon parcels into single objects
> and got the results I wanted from itemquery: a single object in a single
> map. In my case it was more important to be able to show all of the
> multi-polygon parcel in one map than to carry attribute data for the
> individual polygons.
>
> And I agree with you that the best way might be to use mapscript, unless
> someone can show me how to highlite multiple objects in one itemquery map.
>
> Best regards,
> Rich
>
>
> Richard W. Greenwood, PLS
> Greenwood Mapping, Inc.
> Rich at GreenwoodMap.com
> (307) 733-0203
> http://www.GreenwoodMap.com
>