[Qgis-user] Profile from vector point along a straight line

[venerio giuseppe anardu]

Thank you Alexandre for your suggestion: problem solved!





Il Martedì 19 Novembre 2013 16:16, Alexandre Neto <senhor.neto at gmail.com> ha scritto:
 
Hello giuseppe,
You can do it directly on a spreadsheet like libreoffice calc. Get the X and Y coordinates, and elevation from each point, For each point, calculate the distance to the previous point using:

 sqrt((x2-x1)^2 + (y2-y1)^2)

and in a new column calculate acumulate that value (This is the M column).
You can then use the M column and the Z to create a area chart.


Hope this helps.

Alexandre Neto



On Tue, Nov 19, 2013 at 2:57 PM, venerio giuseppe anardu <anardu.geol at yahoo.it> wrote:

I knew and already used that plugin: I have several points on a surface and in that case it suits my purposes because I interpolated the vector points to obtain a DTM raster to use the plugin.
>But in this case I'd need a way to accomplish the task directly from surveyed vector points without interpolating: in other words a profile made by vector points not by interpolated raster surface.
>I've made some esperiments, but interpolate a raster surfece from points surveyed on a straight line, as I supposed, gave unacceptable results...
>
>Giuseppe
>
>
>
>
>
>
>
>Il Martedì 19 Novembre 2013 15:29, Alfonso Flaquer <alfonsofla220 at gmail.com> ha scritto:
> 
>Hi Guiseppe,
>In Qgis 1.8 exist a plugin named Profile Tool. This plugin allow you to create a topographic profile from a raster layer. Maybe you can create a raster from your vector data.
>regards
>
>
>
>Hola Guiseppe,
>En Qgis 1.8 existe un plugin llamado "Profile Tool". este plugin permite realizar un perfil topográfico a partir de un archivo raster. Quizás puedas obtener un raster de tus datos vectoriales y luego utilizar el plugin.
>
>
>Saludos
>
>
>
>2013/11/18 venerio giuseppe anardu <anardu.geol at yahoo.it>
>
>Hello to everybody,
>>
>>I have to make a topographic profile of some vector points surveyed along a straight line, wich is the best way to do it?
>>
>>Many thanks in advance,
>>Giuseppe
>>
>>
>>
>>
>>_______________________________________________
>>Qgis-user mailing list
>>Qgis-user at lists.osgeo.org
>>http://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>
>
>
>-- 
>AfLa 
>
>
>_______________________________________________
>Qgis-user mailing list
>Qgis-user at lists.osgeo.org
>http://lists.osgeo.org/mailman/listinfo/qgis-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20131120/eeb65093/attachment.html>