[gdal-dev] converting lines to linestrings
Hi, I'm not sure if this is the correct list to address this on, but I have lots of files, each with a bunch of lines that start & stop on each others ends and I need to convert them into line strings, file by file. Is there a command-line (batch) way I can do this? They are currently in DGN (v8) format but I can convert them to SHP, MID/MIF or whatever. What I'm looking to do is to create a batch pipeline that, file by file, will take each line, and if either of its ends are within 0.5m of another line-end, then join them together to form one line string, then output that "snapped up" data to disk. (any format) TIA, Zoltan -- === Zoltan Szecsei PrGISc [PGP0031] Geograph (Pty) Ltd. P.O. Box 7, Muizenberg 7950, South Africa. 65 Main Road, Muizenberg 7945 Western Cape, South Africa. 34° 6'16.35"S 18°28'5.62"E Tel: +27-21-7884897 Mobile: +27-83-6004028 Fax: +27-86-6115323 www.geograph.co.za === ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] converting lines to linestrings
On 11-08-27 02:10 AM, Zoltan Szecsei wrote: Hi, I'm not sure if this is the correct list to address this on, but I have lots of files, each with a bunch of lines that start & stop on each others ends and I need to convert them into line strings, file by file. Is there a command-line (batch) way I can do this? They are currently in DGN (v8) format but I can convert them to SHP, MID/MIF or whatever. What I'm looking to do is to create a batch pipeline that, file by file, will take each line, and if either of its ends are within 0.5m of another line-end, then join them together to form one line string, then output that "snapped up" data to disk. (any format) Zoltan, I do not believe you can accomplish this with ogr2ogr. But it is certainly possible to write a script, for instance in python, that would accomplish this in combination with the OGR API. That is the approach I would take. Best regards, -- ---+-- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush| Geospatial Programmer for Rent ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
RE:Re: [gdal-dev] converting lines to linestrings
Sent from my Verizon Wireless 4GLTE smartphone. From : Frank WarmerdamSubject : Re: [gdal-dev] converting lines to linestrings On 11-08-27 02:10 AM, Zoltan Szecsei wrote:> Hi,> I'm not sure if this is the correct list to address this on, but >> I have lots of files, each with a bunch of lines that start & stop on each> others ends and I need to convert them into line strings, file by file.>> Is there a command-line (batch) way I can do this?>> They are currently in DGN (v8) format but I can convert them to SHP, MID/MIF or> whatever.>> What I'm looking to do is to create a batch pipeline that, file by file, will> take each line, and if either of its ends are within 0.5m of another line-end,> then join them together to form one line string, then output that "snapped up"> data to disk. (any format)Zoltan,I do not believe you can accomplish this with ogr2ogr. But it is certainlypossible to write a script, for instance in python, that would accomplishthis in combination with the OGR API. That is the approach I would take.Best regards,-- ---+--I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.comlight and sound - activate the windows | http://pobox.com/~warmerdamand watch the world go round - Rush | Geospatial Programmer for Rent___gdal-dev mailing listgdal-dev@lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] converting lines to linestrings
On 27-08-2011 17:27, Frank Warmerdam wrote: On 11-08-27 02:10 AM, Zoltan Szecsei wrote: Hi, I'm not sure if this is the correct list to address this on, but I have lots of files, each with a bunch of lines that start & stop on each others ends and I need to convert them into line strings, file by file. Is there a command-line (batch) way I can do this? They are currently in DGN (v8) format but I can convert them to SHP, MID/MIF or whatever. What I'm looking to do is to create a batch pipeline that, file by file, will take each line, and if either of its ends are within 0.5m of another line-end, then join them together to form one line string, then output that "snapped up" data to disk. (any format) Zoltan, I do not believe you can accomplish this with ogr2ogr. But it is certainly possible to write a script, for instance in python, that would accomplish this in combination with the OGR API. That is the approach I would take. Hi, The GMT program 'gmtstitch' will do just that but you will have to convert the DGN files to gmt with ogr2ogr Joaquim ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
