How to convert MultiLineStringZ object to MultilineString object?












1














I have CAD-data which I transformed to shapefiles. Currently after the transformation the objects still have a Z value which is useless to me.



My question is: How do I convert a MultiLineStringZ-object to a MultiLineString-object?






qgis postgis postgresql







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şener alkan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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    1














    I have CAD-data which I transformed to shapefiles. Currently after the transformation the objects still have a Z value which is useless to me.



    My question is: How do I convert a MultiLineStringZ-object to a MultiLineString-object?






    qgis postgis postgresql







    share|improve this question









    New contributor




    şener alkan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      1












      1








      1







      I have CAD-data which I transformed to shapefiles. Currently after the transformation the objects still have a Z value which is useless to me.



      My question is: How do I convert a MultiLineStringZ-object to a MultiLineString-object?






      qgis postgis postgresql







      share|improve this question









      New contributor




      şener alkan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I have CAD-data which I transformed to shapefiles. Currently after the transformation the objects still have a Z value which is useless to me.



      My question is: How do I convert a MultiLineStringZ-object to a MultiLineString-object?






      qgis postgis postgresql




      qgis postgis postgresql






      share|improve this question









      New contributor




      şener alkan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









      New contributor




      şener alkan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited 5 hours ago









      Erik

      2,812118




      2,812118






      New contributor




      şener alkan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked 6 hours ago









      şener alkan

      61




      61




      New contributor




      şener alkan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      New contributor





      şener alkan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      şener alkan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






















          2 Answers
          2






          active

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          1














          There is a ST_Force2d function in PostGIS which does the job. A new table should be created with 2D geometry and use an insert statement with select to populate the new table:



          insert into new_table (geom, col1, col2, col3) 
          
select ST_Force2D(geom), col1, col2, col2 from old_table;


          You should substitute your real column names into col1, col2, ...
          You can query the table structure with in psql



          d old_table


          or you can use pgadmin with GUI.






          share|improve this answer





















          • It's working, Thanks for your answer
            – şener alkan
            4 hours ago










          • Could you accept my answer clicking on the up arrow beside my answer?
            – Zoltan
            2 hours ago



















          1














          Run the drop z values algorithm from the QGIS processing toolbox






          share|improve this answer























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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            1














            There is a ST_Force2d function in PostGIS which does the job. A new table should be created with 2D geometry and use an insert statement with select to populate the new table:



            insert into new_table (geom, col1, col2, col3) 
            
select ST_Force2D(geom), col1, col2, col2 from old_table;


            You should substitute your real column names into col1, col2, ...
            You can query the table structure with in psql



            d old_table


            or you can use pgadmin with GUI.






            share|improve this answer





















            • It's working, Thanks for your answer
              – şener alkan
              4 hours ago










            • Could you accept my answer clicking on the up arrow beside my answer?
              – Zoltan
              2 hours ago
















            1














            There is a ST_Force2d function in PostGIS which does the job. A new table should be created with 2D geometry and use an insert statement with select to populate the new table:



            insert into new_table (geom, col1, col2, col3) 
            
select ST_Force2D(geom), col1, col2, col2 from old_table;


            You should substitute your real column names into col1, col2, ...
            You can query the table structure with in psql



            d old_table


            or you can use pgadmin with GUI.






            share|improve this answer





















            • It's working, Thanks for your answer
              – şener alkan
              4 hours ago










            • Could you accept my answer clicking on the up arrow beside my answer?
              – Zoltan
              2 hours ago














            1












            1








            1






            There is a ST_Force2d function in PostGIS which does the job. A new table should be created with 2D geometry and use an insert statement with select to populate the new table:



            insert into new_table (geom, col1, col2, col3) 
            
select ST_Force2D(geom), col1, col2, col2 from old_table;


            You should substitute your real column names into col1, col2, ...
            You can query the table structure with in psql



            d old_table


            or you can use pgadmin with GUI.






            share|improve this answer












            There is a ST_Force2d function in PostGIS which does the job. A new table should be created with 2D geometry and use an insert statement with select to populate the new table:



            insert into new_table (geom, col1, col2, col3) 
            
select ST_Force2D(geom), col1, col2, col2 from old_table;


            You should substitute your real column names into col1, col2, ...
            You can query the table structure with in psql



            d old_table


            or you can use pgadmin with GUI.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 5 hours ago









            Zoltan

            2,997716




            2,997716












            • It's working, Thanks for your answer
              – şener alkan
              4 hours ago










            • Could you accept my answer clicking on the up arrow beside my answer?
              – Zoltan
              2 hours ago


















            • It's working, Thanks for your answer
              – şener alkan
              4 hours ago










            • Could you accept my answer clicking on the up arrow beside my answer?
              – Zoltan
              2 hours ago
















            It's working, Thanks for your answer
            – şener alkan
            4 hours ago




            It's working, Thanks for your answer
            – şener alkan
            4 hours ago












            Could you accept my answer clicking on the up arrow beside my answer?
            – Zoltan
            2 hours ago




            Could you accept my answer clicking on the up arrow beside my answer?
            – Zoltan
            2 hours ago













            1














            Run the drop z values algorithm from the QGIS processing toolbox






            share|improve this answer




























              1














              Run the drop z values algorithm from the QGIS processing toolbox






              share|improve this answer


























                1












                1








                1






                Run the drop z values algorithm from the QGIS processing toolbox






                share|improve this answer














                Run the drop z values algorithm from the QGIS processing toolbox







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 4 hours ago









                Erik

                2,812118




                2,812118










                answered 5 hours ago









                ndawson

                18k22640




                18k22640






















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