[Qgis-user] z factor

[Bernd Vogelgesang]

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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