[gdal-dev] R: Problem using ogrlineref

[Nicola Baraldo (ICONSULTING)]

Hi Dmitry,

thank you for you response. There is a way to do the step 2 using GDAL?
Moreover, if the path lengths are not multiple of the split size (e.g. 1000m), how the last segment is handled?

Best regards,
Nicola

Da: gdal-dev [mailto:gdal-dev-bounces at lists.osgeo.org] Per conto di Dmitry Baryshnikov
Inviato: martedì 7 giugno 2016 16:16
A: gdal-dev at lists.osgeo.org
Oggetto: Re: [gdal-dev] Problem using ogrlineref

Hi Nicola,

The idea of ogrlineref was follow:
1. You have layer with some lines and some reper points with known linear coordinates
2. The reper points divide lines on equal parts (e.i. 1000 m) - this is important that parts should be equal
3. The result file will have special structure (required fields: beg, end, scale, and some optional)
4. During referencing  ogrlineref make attribute query and get needed part based on beg and end fields (which is rather fast), and than calc point position inside this part.

In your case, the simple way is to extract begin and end point of your lines and make them reper points. After that all steps are usual.

There is no sense to move other fields into the parts file from your original datasource. But you can use -lf option to store some value and use it in future for join with your original data.


Best regards,

    Dmitry
07.06.2016 15:19, Nicola Baraldo (ICONSULTING) пишет:
Hi guys,

I am trying to split some routes into segments of the same length (dynamic segmentation) using ogrlineref command.
My data is stored in a shapefile containing a set of paths, for each path I know the length in meters.

I have tried ogrlineref with –create, –get_coord and - get_subline.
For the first option I don’t have a reper datasource to provide because I don’t have mile-stones, are they really necessaries?
The second and third options give me the following error for each path contained in the input shapefile; with –get_coord I have tried both options “–m 0” and “–m 1000”, with –get_subline I have tried “-mb 0 -me 1” options.


Can someone help me using this command? Is there a better way to perform dynamic segmentation using GDAL?
Moreover my shapefile contains also a lot of other fields, there is a way to keep these information also in the output file?

Thanks,
Nicola



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