Shared edges are a pain. You might try preprocessing a version of your planning applications layer and shrink 'em just a bit (10 cm). That way you remove the coincident lines and would get just cases where there is overlaps. I did that here for a polygon selection operation involving counties selecting other counties (we also hit quad boundaries and watersheds where touches weren't an issue). Worked great.
I used ArcInfo to do the buffering but now you can use GEOS and one of the many clients that are out there, including MapScript. I think there's a buffer perl script example shipped with newer versions of MapServer. Steve >>> Mike Saunt <[EMAIL PROTECTED]> 04/10/07 6:10 AM >>> Thanks Richard The highlighting now works a treat - I used an Expression in the end i.e. qstring=(([UPRN] = 100061562714) OR ([UPRN] = 100061561248)) The only other thing I would love to do via the straight CGI is to be able to specify a negativeTOLERANCE. Bascially I have some land parcels (Polygons) that have planning applications (Polygons) over teh top. I want the user to be able to select one or more Land Parcels (done above) and then only find the Planning Applications that Intersect but don't BUTT onto as they would come from a different property. The easiest way I thought of was to have a negative tolerance of say 10cm or so but MapServer doesn't seem to like negative TOLERANCES. Any thoughts? Cheers mike On 04/04/07, Richard Greenwood <[EMAIL PROTECTED]> wrote: > > On 4/3/07, Mike Saunt <[EMAIL PROTECTED]> wrote: > > > I want a user to be able to interactively from multiple clicks on a map > to > > select features and then they can issue a query taking all selected > features > > and doing feature intersect queries against multiple other > layers. Pretty > > simple! > > You could do an asynchronous call to mapserv for each click and get > the each feature ID back, and store it in a JavaScrit array. > > > I'm fine with writing wrapper code to allow the user to select a feature > at > > a point - MODE=QUERY - and then find and store the feature id's for > > subsequent calls to the CGI > > > > Is there a way to be able to pass multiple feature id's to MapServer to > > highlight as selected in a maps? > > Yes, with mode=itemnquery > > Then in the same fashion can I pass > > multiple feature id's (acting as the selection again) to then be used in > a > > NQUERY to find which features from other layers intersect. > > If I was doing it, and if I could use postgis, I would pass the > parameters to a php page, run the query in postgis, get the feature > IDs back, and then do another itemnquery with mapserv to graphically > render it. This would not require mapscript, but would require php or > some other server-side language that can connect to postgis. > > Rich > > -- > Richard Greenwood > [EMAIL PROTECTED] > www.greenwoodmap.com >
