Members, I need help or guidance on how to calculate the polygon area, may be I'm doing is a wrong way.
I toggle edit tab i.e the pencil icon and i use vectors geometry tools to export/add geometry columns. But it gives me area as a decimal For God and My Country Consultant in: GIS,Forestry and Environment @ Earth Consult(U) Ltd. CCRP GIS Support-Uganda (The MCKNIGHT Foundation) Rotarian at RC. Bweyogerere Namboole Mob: 0772/0752-841118 Sent from Lumia Windows phone -----Original Message----- From: "Benoît Laurent" <[email protected]> Sent: 23/06/2015 12:05 To: "[email protected]" <[email protected]> Subject: Re: [Qgis-user] Transparency for vector symbol layers Hello Andreas, Thank you very much for your complete answer. Actually, I reached my goal using rule based renderers. Regards, Benoît Hi Benoit, It depends. Yes - you can mix transparent and opaque features. For each color you can also set the opacity/transparency value. However, if two features overlap and you use transparency on the feature level, you can see the features shine through - whereas when the transparency would be on the symbol level (which isn't implemented yet in QGIS) you would first composite all elements in a symbol level and then apply the opacity on the whole group. See http://www.w3.org/TR/2011/REC-SVG11-20110816/masking.html#ObjectAndGroupOpacityProperties for the difference. In http://www.w3.org/TR/2011/REC-SVG11-20110816/images/masking/opacity01.png - if you look at the bottom row of circles - the second pair of circles has the opacity on the group of two circles, whereas the third pair has opacity on every single element. I hope you can see the difference. It would be very cool if QGIS could have a more fine-grained opacity - new opacity on symbol level and new opacity on a whole group of layers. It would make the cartographic options even better ;-) Andreas On 19.06.2015 16:40, Benoît Laurent wrote: Hello, I noticed this feature request : https://hub.qgis.org/issues/3438. Is it possible to have semi-transparent and opaque features within the same layer ? Best regards, Benoît --- L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast. https://www.avast.com/antivirus _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user -- Benoît LAURENT Consultant Optimisation 9, rue Alexandre Fleming, 49066 Angers CEDEX +33 (0)6 28 03 81 32 [email protected] +33 (0)9 54 30 41 14 www.heurisis.eu Visitez le site www.optiscolaire.fr Avant d’imprimer ce mail, pensez à l’environnement L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast. www.avast.com
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