I am mapping some rural areas. Basically there are 90% farmland, on some spots farm yards and even residential areas. I would no simply make the whole area farmland and put inside the farm yards and residential areas. Is this okay? Should I go even further and put natural wood on top of this landuse=farmland as they are quite small compared to the area of farmland? On which point should we start to make disjunct areas of landuse and when is it okay to nest them? asked 01 Dec '12, 17:55  AddisMap_Ale... edited 01 Dec '12, 17:55 |
One Answer:
You shouldn't stack them on top of each other. Use a multipolygon for the farmland, so the other landuses are holes in it. Go to the bottom of the page for a practical example. Reply to the first comment: If you have one big area of farmland and inside it are ten farmyards and twenty little patches of wood, then however you are going to map it, this requires you to draw 31 polygons. The multipolygon adds 1 (one) relation to it. One relation does not constitute a huge amount of data compared to the 31 other objects you have to map anyway. answered 01 Dec '12, 19:59  cartinus edited 06 Dec '12, 19:05 |
Is this really necessary? I think this would create a huge amount of additional data were I do not see the use.