[Qgis-user] z factor

[Nicolas Cadieux]

Hi,
Thanks for the heads up. I will check.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 27 nov. 2020 à 06:01, Bernd Vogelgesang <bernd.vogelgesang at gmx.de> a écrit :
> 
> 
>> On 27.11.20 10:52, Raymond Nijssen wrote:
>> ...
>> 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"?
> Isn't that already covered by the "Projestions" plugin?
>> 
>> 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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