[gdal-dev] drawing line using OGR and mysql in mapserver
Murat Beyhan
beyhan at deprem.gov.tr
Fri Mar 2 07:08:25 EST 2012
Chaitanya,
I could not do this using sql sorry.
But I have an another idea is it good way to store these data as a
spatial database in MySql.
I try this but when I insert data to mysql table
I have problem .
I have created a table
as follows
eq_id varchar(14)
fault linestring
then I will insert data (if I success how to do that)
then I will use this table from mapserver.
is this proper way.
Or how to declare geom column as string at sql statement as follows
create view lineview as select eq_id, "LINESTRING(" + lon1 + " " + lat1
+ "," + lon2 + " " + lat2 + ")" as geom from sfault
please give your idea...
On Thu, 2012-03-01 at 14:40 +0530, Chaitanya kumar CH wrote:
> Murat,
>
>
> It's not working. the geom field should not be 'Real'. It should be
> 'String'. Try something else other than the '+' operator in the SQL
> syntax to create the geom field in the view.
>
> On Thu, Mar 1, 2012 at 12:48 PM, Murat Beyhan <beyhan at deprem.gov.tr>
> wrote:
> Chaitanya,
>
> I have had a progress about VRT data access
> but I afraid something wrong in mapserver .map file.
>
> here is the test.vrt file and I use in map file with
> connection ogr
> functionality. :
>
> <OGRVRTDataSource>
> <OGRVRTLayer name="dynamic">
> <SrcDataSource>MYSQL:dynamic,user=root,password=mysql_passwd,host=localhost,port=3306,tables=lineview</SrcDataSource>
> <SrcSql>select eq_id, geom from lineview</SrcSql>
> <GeometryType>wkbLineString</GeometryType>
> <GeometryField encoding="WKT" field="geom"/>
>
> </OGRVRTLayer>
> </OGRVRTDataSource>
>
> then the command
>
>
> [murat at localhost stations]$ ogrinfo -ro -al test.vrt
> INFO: Open of `test.vrt'
> using driver `VRT' successful.
>
>
> Layer name: dynamic
> Geometry: Line String
> Feature Count: 2
> Layer SRS WKT:
> (unknown)
>
> eq_id: String (42.0)
> geom: Real (23.0)
> OGRFeature(dynamic):0
> eq_id (String) = 20111023101120
> geom (Real) = 164
>
> OGRFeature(dynamic):1
> eq_id (String) = 20100308023229
> geom (Real) = 163
>
>
>
> it works now but mapserver gives an error as follows:
>
> Server error!
> The server encountered an internal error and was unable to
> complete your
> request.
>
> Error message:
> Premature end of script headers: mapserv
>
> If you think this is a server error, please contact the
> webmaster.
>
>
> Error 500
> 10.14.0.67
> Apache/2.2.14 (Mandriva Linux/PREFORK-1.6mdv2010.0)
>
>
>
> I think I will solve it with your help.
>
> Many thanks
>
> Murat
>
>
> On Thu, 2012-03-01 at 09:22 +0530, Chaitanya kumar CH wrote:
> > Murat,
> >
> > You should check MySQL's SQL syntax to concatenate strings
> and
> > decimals to produce a string.
> >
> > On Wednesday, February 29, 2012, Murat Beyhan
> <beyhan at deprem.gov.tr>
> > wrote:
> > > Chaitanya,
> > >
> > > here is the structure of table on database
> > >
> > > sfault :
> > >
> > > eq_id varchar(14)
> > > lat1 decimal(7,4)
> > > lon1 decimal(7,4)
> > > lat2 decimal(7,4)
> > > lon2 decimal(7,4)
> > >
> > > lineview :
> > >
> > >
> > > eq_id varchar(14)
> > > geom double
> > >
> > >
> > > it seams geom as double
> > > I thing it should be geometry isn't it?
> > >
> > > may be I have to change structure of lineview by changing
> following
> > > Roberts' suggestion to create view on database
> > >
> > > create view lineview as select eq_id, "LINESTRING(" +
> lon1 + " " +
> > lat1
> > > + "," + lon2 + " " + lat2 + ")" as geom from sfault
> > >
> > >
> > > but I'm not sure for the line.
> > >
> > > VTR for points, I have tested and works well
> > >
> > >
> > > but for line still could not achieved yet, please give me
> another
> > idea.
> > >
> > > here is test.vrt file
> > >
> > > <OGRVRTDataSource>
> > > <OGRVRTLayer name="sta">
> > >
> >
> <SrcDataSource>MYSQL:stations,user=root,password=mysql_passwd,host=localhost,port=3306,tables=sta</SrcDataSource>
> > > <SrcSQL>SELECT sta_id as name,type,latitude,longitude from
> sta where
> > > type like "%SMACH%"</SrcSQL>
> > > <GeometryType>wkbPoint</GeometryType>
> > > <GeometryField encoding="PointFromColumns" x="longitude"
> > y="latitude"/>
> > > </OGRVRTLayer>
> > > </OGRVRTDataSource>
> > >
> > > and following code gives successful result as you see
> > >
> > >
> > > ogrinfo -ro -al test.vrt
> > >
> > > INFO: Open of `test.vrt' using driver `VRT' successful.
> > >
> > > Layer name: sta
> > > Geometry: Point
> > > Feature Count: 12
> > > Layer SRS WKT:
> > > (unknown)
> > > name: String (12.0)
> > > type: String (24.0)
> > > latitude: Real (5.4)
> > > longitude: Real (5.4)
> > > OGRFeature(sta):0
> > > name (String) = 0617
> > > type (String) = SMACH
> > > latitude (Real) = 40.4569
> > > longitude (Real) = 32.6319
> > > POINT (32.631900000000002 40.456899999999997)
> > >
> > > OGRFeature(sta):1
> > > name (String) = 0618
> > > type (String) = SMACH
> > > latitude (Real) = 40.4798
> > > longitude (Real) = 32.4555
> > > POINT (32.4555 40.479799999999997)
> > >
> > > .
> > > .
> > > .
> > > .
> > >
> > >
> > > As you see this works well.
> > >
> > > I hope you can catch point what is wrong or lack of on my
> works....
> > >
> > >
> > > Thanks again
> > >
> > >
> > >
> > >
> > > On Tue, 2012-02-28 at 18:08 +0530, Chaitanya kumar CH
> wrote:
> > >> Murat,
> > >>
> > >>
> > >> I see that your view, lineview, doesn't give the
> expected geometry
> > >> type with ogrinfo. It is showing the datatype as Real.
> Check if the
> > >> datatype of geom is actually string/text.
> > >>
> > >> On Tue, Feb 28, 2012 at 12:49 PM, Murat Beyhan
> > <beyhan at deprem.gov.tr>
> > >> wrote:
> > >> Chaitanya,
> > >>
> > >>
> > >> Map file which is try to draw line as follows
> > >> are there any problem on the code
> > >>
> > >> LAYER
> > >> NAME sfault1
> > >> CONNECTIONTYPE OGR
> > >> CONNECTION '<OGRVRTDataSource>
> > >> <OGRVRTLayer name="lineview">
> > >>
> > >>
> >
> <SrcDataSource>MYSQL:dynamic,user=root,password=mysqlpasswd,host=localhost,port=3306,tables=lineview</SrcDataSource>
> > >> <SrcLayer>lineview</SrcLayer>
> > >> <GeometryType>wkbLineString</GeometryType>
> > >> <GeometryField encoding="WKT" field="geom"/>
> > >> <LayerSRS>WGS84</LayerSRS>
> > >> <FID>eq_id</FID>
> > >> </OGRVRTLayer>
> > >> </OGRVRTDataSource>'
> > >> DATA sfault1
> > >> STATUS on
> > >> TYPE line
> > >> CLASS
> > >> NAME "Source Fault"
> > >> SYMBOL "cline"
> > >> SIZE 3
> > >> COLOR 0 0 255
> > >> END
> > >> END
> > >>
> > >>
> > >> ogrinfo
> > >>
> >
> MYSQL:dynamic,user=root,password=mysqlpasswd,host=localhost,port=3306
> > >> sfault -summary
> > >> INFO: Open of
> > >>
> >
> `MYSQL:dynamic,user=root,password=mysqlpasswd,host=localhost,port=3306'
> > >> using driver `MySQL' successful.
> > >>
> > >> Layer name: sfault
> > >> Geometry: None
> > >> Feature Count: 1
> > >> Layer SRS WKT:
> > >> (unknown)
> > >> eq_id: String (14.0)
> > >> lat1: Real (7.4)
> > >> lon1: Real (7.4)
> > >> lat2: Real (7.4)
> > >> lon2: Real (7.4)
> > >>
> > >> **************linewiew created by following sql
> > >> statement:*************
> > >>
> > >>
> > >> create view lineview as select eq_id,
> "LINESTRING(" + lon1
> > +
> > >> " " + lat1
> > >> + "," + lon2 + " " + lat2 + ")" as geom from
> sfault
> > >>
> > >>
> > >> then
> > >>
> > >> [murat at localhost ~]$ ogrinfo
> > >>
> >
> MYSQL:dynamic,user=root,password=mysqlpasswd,host=localhost,port=3306
> > >> lineview -summary
> > >> INFO: Open of
> > >>
> >
> `MYSQL:dynamic,user=root,password=mysqlpasswd,host=localhost,port=3306'
> > >> using driver `MySQL' successful.
> > >>
> > >> Layer name: lineview
> > >> Geometry: None
> > >> Feature Count: 1
> > >> Layer SRS WKT:
> > >> (unknown)
> > >> eq_id: String (14.0)
> > >> geom: Real (0.0)
> > >>
> > >>
> > >>
> >
> > --
> > Best regards,
> > Chaitanya kumar CH.
> >
> > +91-9494447584
> > 17.2416N 80.1426E
> >
>
> > --
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> > believed to be clean.
>
>
>
> Murat BEYHAN
>
> Jeofizik Y.Müh.
> T.C. Başbakanlık
> Afet ve Acil Durum Yönetimi Başkanlığı
> Deprem Dairesi Başkanlığı
> Eskişehir Yolu 12. Km.
> Lodumlu/ANKARA
> Tel: 312 2872680-1556
> email:beyhan at deprem.gov.tr
>
>
>
>
> --
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>
>
>
>
>
> --
> Best regards,
> Chaitanya kumar CH.
>
> +91-9494447584
> 17.2416N 80.1426E
>
>
> --
> This message has been scanned for viruses and
> dangerous content by MailScanner, and is
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Murat BEYHAN
Jeofizik Y.Müh.
T.C. Başbakanlık
Afet ve Acil Durum Yönetimi Başkanlığı
Deprem Dairesi Başkanlığı
Eskişehir Yolu 12. Km.
Lodumlu/ANKARA
Tel: 312 2872680-1556
email:beyhan at deprem.gov.tr
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