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Hi Nicola,<br>
<br>
The first and last segments usually have beg and end fields value
not <span id="result_box" class="short_text" lang="en"><span
class="">a multiple of 1000. <br>
I.e. begin = 576 m, end 1000 m or begin 76200 m, end 76234 m<br>
This is ok, and ogrlineref correctly woks with this case. <br>
<br>
I think, that you can try to play with your data without equal
parts sizes. But ogrlineref need - beg (double), end(double) and
scale (double) fields.<br>
Scale - is spatial length of you part divided on linear lenght.<br>
I.e. scale = part.get_Length() / (end - beg) <br>
</span></span><br>
<pre class="moz-signature" cols="72">Best regards,
Dmitry</pre>
<div class="moz-cite-prefix">07.06.2016 18:25, Nicola Baraldo
(ICONSULTING) пишет:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext">Hi
Dmitry,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext"
lang="EN-US">thank you for you response. There is a way to
do the step 2 using GDAL?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext"
lang="EN-US">Moreover, if the path lengths are not multiple
of the split size (e.g. 1000m), how the last segment is
handled?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext"
lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext"
lang="EN-US">Nicola<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext"
lang="EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="color:windowtext;mso-fareast-language:IT">Da:</span></b><span
style="color:windowtext;mso-fareast-language:IT">
gdal-dev [<a class="moz-txt-link-freetext" href="mailto:gdal-dev-bounces@lists.osgeo.org">mailto:gdal-dev-bounces@lists.osgeo.org</a>]
<b>Per conto di </b>Dmitry Baryshnikov<br>
<b>Inviato:</b> martedì 7 giugno 2016 16:16<br>
<b>A:</b> <a class="moz-txt-link-abbreviated" href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br>
<b>Oggetto:</b> Re: [gdal-dev] Problem using ogrlineref<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Nicola,<br>
<br>
The idea of ogrlineref was follow:<br>
1. You have layer with some lines and some reper points with
known linear coordinates<br>
2. The reper points divide lines on equal parts (e.i. 1000 m)
- this is important that parts should be equal<br>
3. The result file will have special structure (required
fields: beg, end, scale, and some optional)<br>
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.<br>
<br>
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.
<br>
<br>
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.<br>
<br>
<span style="font-size:12.0pt;mso-fareast-language:IT"><o:p></o:p></span></p>
<pre>Best regards,<o:p></o:p></pre>
<pre> Dmitry<o:p></o:p></pre>
<div>
<p class="MsoNormal">07.06.2016 15:19, Nicola Baraldo
(ICONSULTING) пишет:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif">Hi
guys,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US">I am trying to split some routes into
segments of the same length (dynamic segmentation) using
ogrlineref command.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US">My data is stored in a shapefile containing a
set of paths, for each path I know the length in meters.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif">I
have tried ogrlineref with –create, –get_coord and -
get_subline.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US">For the first option I don’t have a reper
datasource to provide because I don’t have mile-stones,
are they really necessaries?</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US">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.</span><o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:IT"><br>
<br>
<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:IT"
lang="EN-US">Can someone help me using this command? Is
there a better way to perform dynamic segmentation using
GDAL?</span><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:IT" lang="EN-US">
</span><span style="font-size:12.0pt;font-family:"Times
New Roman",serif;mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US">Moreover my shapefile contains also a lot of
other fields, there is a way to keep these information
also in the output file?</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US">Nicola</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:IT"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>gdal-dev mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><o:p></o:p></pre>
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