[Qgis-user] z factor

[C Hamilton]

I have a Lat Lon Tools plugin, Field Calculator function that generates the
UTM zone.

Nicolas, you just reminded me that you had suggested this to me earlier as
a plugin. Something like that would be easy to add, but I'm not sure it
fits within Lat Lon Tools which captures different coordinates, but
z-factor is related to the latitude so perhaps it fits.

Does anyone think it would be worth adding to Lat Lon Tools or should it be
a separate plugin?

Calvin

On Fri, Nov 27, 2020 at 4:52 AM Raymond Nijssen <r.nijssen at terglobo.nl>
wrote:

> Hi Nicolas,
>
> It is just a simple formula for calculating the "z-factor" for a given
> latitude. What would that look like in a plugin? Where would it go? What
> would it do or show?
>
> Last week I had a similar idea for a plugin that could tell you which
> UTM zone to pick for your current canvas. I decided it would not be
> worth the effort. But maybe these could go together (and be finished at
> the end of this "KwakFriday"?
>
> Regards,
> Raymond
>
>
> On 27-11-2020 06:13, Nicolas Cadieux wrote:
> > Hi,
> >
> > It's just the Z factor needed when you make a hillshade when the x an y
> > are in degrees and the z is in feet or meters (like SRTM). You can see
> > it if you choose Hillshade under symbology / render type (for a raster
> > layer).  It's basically the length of a degree in meters for latitude.
> >
> >
> https://www.esri.com/arcgis-blog/products/product/imagery/setting-the-z-factor-parameter-correctly/
> >
> >
> > Nicolas
> >
> > On 2020-11-27 12:08 a.m., Richard Duivenvoorde wrote:
> >> On 11/27/20 5:28 AM, Nicolas Cadieux wrote:
> >>> I want to learn to make a QGIS plugin and I was wondering if anybody
> >>> new if there is a QGIS plugin or tool that calculates the z factor
> >>> for a particular latitude? I thought this would be an easy project to
> >>> start with but I don't want to duplicate someone else's work.
> >> Hi Nicolas,
> >>
> >> What do you mean with "calculates the z factor for a particular
> >> latitude"?
> >>
> >> - z-factor as in x,y,z?
> >> - Do you mean based on a crs/datum? So more proj-based?
> >> - Or do you mean based on a known dataset with not enough z-info? So
> >> more extra/intrapolation?
> >> - Raster? Vector?
> >> - Creating a new dataset (processing)? Or just reporting for one lat
> >> (desktop/gui)?
> >>
> >> Just trying to get an idea of your idea :-)
> >>
> >> Regards,
> >>
> >> Richard Duivenvoorde
> >>
> >>
> >>
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