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

[Alexandre Neto]

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
>
>
>
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