[gdal-dev] drawing line using OGR and mysql in mapserver
Murat Beyhan
beyhan at deprem.gov.tr
Fri Mar 2 07:42:25 EST 2012
Dear Chaitanya,
I see what you explain first I convert lat lon data to string then I
concatenate them to string again. But I would like to ask
I have already add data to mysql table as follows is this also correct
because when I browse table it seems it store data in geometry field
but mapserver gives error
Unable to identify source field 'fault' for geometry.
any way
I will try to convert data first then I can return back you.
Regards...
ps.
ogrinfo
MYSQL:dynamic,user=root,password=mysql_123,host=localhost,port=3306,tables=geom
INFO: Open of
`MYSQL:dynamic,user=root,password=mysql_123,host=localhost,port=3306,tables=geom'
using driver `MySQL' successful.
1: geom (None)
it say none in geom
may be first I have to do what you say
thanks
Murat
On Fri, 2012-03-02 at 18:05 +0530, Chaitanya kumar CH wrote:
> Murat,
>
> Put aside linestrings and geometries. First you need to have a wkt
> representation of your line segment. Your MySQL query is returning a
> number. That should be an indicator that your query was wrong. You
> were using the wrong operator. You need to convert the latitude and
> longitude values to string and concatenate the them with the other
> strings to make up the wkt of linestring geometries. Otherwise, MySQL
> is just adding the string and decimal values mathematically.
>
> Use the CONVERT function as described in the website:
> http://www.geeksengine.com/database/single-row-functions/conversion-functions.php
>
> On Fri, Mar 2, 2012 at 5:38 PM, Murat Beyhan <beyhan at deprem.gov.tr>
> wrote:
> 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
> > >
> >
> > > --
> > > This message has been scanned for viruses and
> > > dangerous content by MailScanner, and is
> > > 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
> >
> >
> >
> >
> > --
> > This message has been scanned for viruses and
> > dangerous content by MailScanner, and is
> > believed to be clean.
> >
> >
> >
> >
> >
> >
> > --
> > 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
> > 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
>
>
>
>
> --
> This message has been scanned for viruses and
> dangerous content by MailScanner, and is
> believed to be clean.
>
>
>
>
>
> --
> 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
> 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
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
More information about the gdal-dev
mailing list