[Qgis-user] contours and symbology

[Sebastian Gutwein]

Bernd,
Thanks for the hint.
The % operator description in QGIS only says: Remainder of division
This has thrown me off in the past because I have tried to search for the
Modulo in the expressions dialog and nothing came up.
I should probably request a change to add the modulo term at the QGIS git
hub.


On Wed, Mar 3, 2021 at 1:45 PM Bernd Vogelgesang <bernd.vogelgesang at gmx.de>
wrote:

> In case someone wants to google for the " % " later: it's called modulo
> operator (damn, took me half an hour to remember that)
>
>
> On 03.03.21 19:20, Sebastian Gutwein wrote:
>
> Sorry typo: "ELEV" :The attribute field that contains your elevation
>
> On Wed, Mar 3, 2021 at 1:19 PM Sebastian Gutwein <bas at rdgland.com> <bas at rdgland.com> wrote:
>
>
> I use rule based styling with this expression for my 100m contour filter
> rule:
> "ELEV" % 100 = 0
> And then another rule that has the Else selected.
> The formula is:
> "ELEV" :The attribute field that contains your label
> % : The remainder from division
> 100 : the divider
> = 0 : the remainder should equal zero.
> This filters all the 100m contours.
>
> On Wed, Mar 3, 2021 at 1:01 PM Azzurra Lentini <azzurralentini at gmail.com> <azzurralentini at gmail.com>
> wrote:
>
>
> Hi to all,
>
> I have extracted contours from a dtm raster 20 m resolution file and the
> result is a vector file of contours with 20 m of interval between the
> contours.
>
> I would like to have two different symbols for these contours: for
> example black colour and thickness 1 for the contours with interval of 100
> m (0, 100, 200, 300 etc.) and grey colour and thickness 0.5 for the
> contours 20, 40, 60, 80, 120, 140 .. etc.).
>
> What can I do?
>
> Normally I create another contours file only for the contours equidistant
> 100 m and I put a different symbol for the 2 layers.
>
> Do you know other ways without the creation of another file?
> maybe rule-based symbology?
>
>
> Thank you, Azzurra
>
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