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.nijs...@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 > >> > >> > >> > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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