Hi Calvin, On 28/06/19 01:18, Nyall Dawson wrote: > On Fri, 28 Jun 2019 at 05:14, C Hamilton <[email protected]> wrote: >> >> How much interested would there be for a plugin to display sunrise and >> sunset information for a particular location on the earth's surface. Is >> anyone already working on this? There doesn't seem to be a capability for >> this, but perhaps I have missed it. Are there other astronomical >> calculations that would be worth while in QGIS? (Moon asimuth/position, >> phase) >> >> I a trying to get a sense of interest and also make sure I am not >> duplicating a capability someone is already working on. > > This would be super-handy. I've needed this value in the past on > different projects, and would love to see an easy way to calculate it > in QGIS. > > Can I suggest that the best form this would take would be a new > expression function? E.g. sunrise(point_in_wgs_84, target_date) -> > gives a time value in return. That would give maximum flexibility in > terms of use (mmmm, i like the idea of dynamically styling event > points using a different icon whether they occurred at night or day! I > could imagine this being used heavily alongside Time Manager) . > > I'd love to see it in core, if you want to contribute it as a c++ > function. I'm happy to mentor here, and writing new expression > functions is a great, self-contained way to dive into the QGIS code > base.
I agree, it can be useful. As a reference, also GRASS has since ages similar calculations: https://grass.osgeo.org/grass77/manuals/r.sun.html and related commands. Cheers. -- Paolo Cavallini - www.faunalia.eu QGIS.ORG Chair: http://planet.qgis.org/planet/user/28/tag/qgis%20board/ _______________________________________________ QGIS-Developer mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
