[Qgis-user] z factor

[Nicolas Cadieux]

Hi,

I did suggest it indeed.  Ideally, it would go in the QGIS core every time they ask for a z factor. (Like under shading in the layer style).  I will probably play around with it just to learn who to make a plugin but if you want to put it in your plugin, go ahead.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 27 nov. 2020 à 08:43, C Hamilton <adenaculture at gmail.com> a écrit :
> 
> 
> 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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