[Qgis-user] How calculate sequential values based on spatial pattern
Bernd Vogelgesang
bernd.vogelgesang at gmx.de
Tue May 7 10:02:26 PDT 2019
Hi Alexandre,
did you find time have a look at this stuff?
I would be very interested in an "easy" solution with SQL and virtual
layers :)
Cheers,
Bernd
Am 05.05.19 um 10:25 schrieb Alexandre Neto:
> That is actually quite easy using a bit of SQL in a virtual layer.
> After all the west to east and north to south is just a matter of
> adding a X and a Y fields and order first by X, then by Y.
>
> I am not at my computer now, but when I came back I will try to get
> you a ready to use query.
>
> Alex
>
> A qui, 2/05/2019, 17:39, Fernando M. Roxo da Motta <petro at roxo.org
> <mailto:petro at roxo.org>> escreveu:
>
> On Thu, 2 May 2019 06:52:43 +0000, Karl Magnus Jönsson
> <Karl-Magnus.Jonsson at kristianstad.se
> <mailto:Karl-Magnus.Jonsson at kristianstad.se>> wrote:
>
>
> > Hi!
> > One way could be to calculate the sequence and coordinates in Excel
> > or something similar. If the points are regularly spaced of course.
> > Then save to csv, import in QGIS and save to whatever.
>
> That can be a great idea.
>
> In my problem all a have to start is a polygon, not necessarily
> regular, and the directions and spacing of the lines. The lines
> in the
> grid doesn't have to be orthogonal and almost never NS/EW.
>
> That seems to be a little cumbersome for an excel spreadsheet. 🤔🤔
>
>
>
> >
> > Cheers!
> >
> > Karl-Magnus Jönsson
> >
> >
> > -----Ursprungligt meddelande-----
> > Från: Qgis-user [mailto:qgis-user-bounces at lists.osgeo.org
> <mailto:qgis-user-bounces at lists.osgeo.org>] För
> > Fernando M. Roxo da Motta Skickat: den 2 maj 2019 02:16
> > Till: qgis-user at lists.osgeo.org <mailto:qgis-user at lists.osgeo.org>
> > Ämne: Re: [Qgis-user] How calculate sequential values based on
> > spatial pattern
> >
> > On Wed, 1 May 2019 16:38:41 -0500, Apoyo Carbono
> > <ana.munevar at fcgsas.com <mailto:ana.munevar at fcgsas.com>> wrote:
> >
> >
> > > Hi!
> > > I need your help. I need to Create a numbers sequentially in a
> > > "Points shapefile" with a spacial pattern.
> > > For example, the point number 1 start northwestern and the next
> > > numbers points will be order from west to east. For the next
> row (to
> > > South) going from west to east too.
> > > And so on, the values points increase to the south. Therefore the
> > > last point will be in the southeast.
> > > For now I'm doing manual but it is around 1,000 points!
> >
> > This looks like a lot to a 3D seismic survey. 🤔🤔🤔
> >
> > I had a script for Qgis 2.x that worked well enough to be
> useful to
> > me. The points were generated using a grid support. In your case I
> > would have a set of EW lines spaced regularly from north to
> south, and
> > numbered that way.
> >
> > During the points generation I had two (among others) attributes
> > associated to each point. The first one was a point number within
> > the line and the other the line number.
> >
> > The points were generated so that all points with the same point
> > number were parallel to another set of line (usually
> perpendicular to
> > the first one).
> >
> > I don't know if this is like you are looking for, the point here
> > (pun unintended) were to associate the numbering attribut while
> > generating the points.
> >
> > Hope this helps.
> >
> >
> > >
> > > I hope that you understand my situation. Can you help me? I could
> > > send you the shapefile with an example better explained
> > >
> >
> >
> > Roxo
> >
> > P.S.- It is possible to still have tose set of scripts luking around
> > somewhere, they were never ported to 3.X. They were too horrible to
> > begin with. 😇😇
>
>
>
>
>
>
>
>
> Roxo
>
> --
> ---------------- Non luctari, ludare -------------------+ WYSIWYG
> Fernando M. Roxo da Motta <petro at roxo.org <mailto:petro at roxo.org>>
> | Editor?
> Except where explicitly stated I speak on my own behalf.| VI !!
> PU5RXO | I see text,
> ------------ Quis custodiet ipsos custodes?-------------+ I get text!
>
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