Hi, The question, if I understand is correctly, is relevant. In EPSG:4326 shortest distance between two points is better expressed as a curve than as a straight linestring. However, Mapserver does not support curves of any kind.
You may find some workaround from GDAL. Ogr2ogr is having a "segmentize" option for this purpose. It does not support real curves either, but it creates intermediate points so that linestrings are shorter and thus follow the curve better. See http://gdal.org/ogr2ogr.html -Jukka Rahkonen- > -----Alkuperäinen viesti----- > Lähettäjä: mapserver-users-boun...@lists.osgeo.org > [mailto:mapserver-users-boun...@lists.osgeo.org] Puolesta Mr. > Puneet Kishor > Lähetetty: 27. kesäkuuta 2012 17:39 > Vastaanottaja: juliap > Kopio: mapserver-users@lists.osgeo.org > Aihe: Re: [mapserver-users] Curved Lines > > > On Jun 27, 2012, at 2:13 AM, juliap wrote: > > > Hi all, > > > > I have the following layer of type line : > > > > LAYER > > NAME line > > STATUS ON > > TYPE LINE > > CONNECTIONTYPE OGR > > CONNECTION > "MSSQL:server=server;database=database;uid=id;pwd=pwd" > > DATA "SELECT geometry::STLineFromText('LINESTRING (' > > +CAST(Geo.STX AS VARCHAR(54)) > > +' ' > > +CAST(Geo.STY AS VARCHAR(54)) > > +', ' > > +CAST(Geo.STX AS VARCHAR(54)) > > +' ' > > +CAST(Geo.STY AS VARCHAR(54)) > > +')' > > ,4326) > > FROM column WHERE DATEDIFF(mi, CreatedON, > CURRENT_TIMESTAMP) <='%x%'" > > CLASS > > STYLE > > WIDTH 3 > > SIZE 1 > > COLOR 0 0 128 > > END # end of style > > END # end of class > > PROJECTION > > "init=epsg:4326" > > END # end of projection > > END # end of layer > > > > I was wondering how to get a curved line from this data. I > tried using angle > > and gap, but I don't see any changes. > > Any suggestions? > > > > > Your understanding of geometry is a bit off here. In a query > result set, each row is a feature, and a line feature would > be made up of two or points; a curved line feature, of > course, would be made up of three or more points. > > What you are getting in the result set above is a bunch of > features, each of which are a point repeated twice. I think > what you really want is to create a single line feature from > all these points. So, you would probably do some kind of an > aggregate on these points. I don't know the functions > available in SQL Server, but there must be an analog for > Postgres's aggregate functions. You want to collect all the > points and make a line feature from them, and then pass that > to MapServer to draw. You could make a view that does all > this, and then call the view from MapServer. > > Hope this helps. > > > -- > Puneet Kishor > _______________________________________________ > mapserver-users mailing list > mapserver-users@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/mapserver-users > _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
