On 04/22/2013 04:38 PM, Vincent Bain wrote:
Le lundi 22 avril 2013 à 14:58 +0200, Moritz Lennert a écrit :On 22/04/13 14:41, Vincent Bain wrote:Thank you Moritz,- I'm not sure I like the difference in size of cat values between layers. It gives the idea that there is one important and two secondary layers.Sorry, I don't understand. Cats values are all the same font size in the drawing (I turned "1" values to sth else, perhaps an optical illusion)Sorry, I was confused by your "id". I'm not sure that this id is helpful in your drawing as most users will never be confronted to id's, only to cat values. I think making them this prominent in the drawing might cause more confusion than help in understanding.I agree with you that most users won't feel concerned by the feature-id, especially the majority of people working on imported data (what's more for the user, there's no way to manage this internal numbering). Those who learn grass in order to /produce/ geographical data may very soon in their learning process be concerned by this. My humble opinion is that awareness of the existence of a geometrical identifier is an integral part of the problem. I would keep it in the sketch, perhaps as you suggest in a less prominent appearance.
+1. Like so many, I also got confused about this the first time I started working with the GRASS vector API. Maybe you could put a short note somewhere on the illustration stating that "the internal feature ID is assigned automatically and can be used to select geometries directly (using v.edit)" or similar. Best, Ben
No, what I meant is to have a unique cat for each plot in layer 2 and then have an attibute table with columns cat and type, the second then giving the type of the plot, while the first is a unique identifier of each plot.OK, I'll have a look. Thanks, V. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
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