Hi Winfried, usually in QGIS, unless it's specified differently, the distance field is in the same units as the project properties. So, 5km would be 5000m in the the projected UTM zones which use meters. If 0,05 worked then I assume that your project is in degrees/minutes/seconds (https://en.wikipedia.org/wiki/Decimal_degrees) which is approximately 5km at the equator, close enough for what you want to do this time.
One of the key things you'll need to know about if you keep working on GIS stuff is projections, QGIS can automatically reproject for map displays. However, when doing a calculation / operation that involves 2 or more inputs then I make sure to reproject all the inputs to the same system and work on those files only (save as and select a common projection) knowing the UTM zone or whatever meters/feet projection is used locally is helpful when you need to work out distances and areas in useful units. Matt On Tue, May 9, 2017 at 7:22 PM, Winfried <codecompl...@free.fr> wrote: > Thank you. > > Turns out I was pretty close to the solution: The error was in the order > parameters were set in the Spatial Query dialog. Also, there is no > information on the unit used for Distance in the Fixed Distance Buffer; I > guess "0,05" means 5kms. > > <http://osgeo-org.1560.x6.nabble.com/file/n5319849/QGIS.png> > > I'll see if a simple Python script can perform the same thing, or even > split > campsites into regions instead of whole nations. > > > > -- > View this message in context: http://osgeo-org.1560.x6. > nabble.com/Keeping-only-POIs-X-kms-from-a-trace-tp5319730p5319849.html > Sent from the QGIS - User mailing list archive at Nabble.com. > _______________________________________________ > 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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