In Leeds, UK, there's a part of the River Aire which goes under the Leeds Armley Industrial Museum. The Aire is represented by a polygon. How should this be mapped? Currently, I've got a multipolygon which the building is placed upon. But how do I map the actual course of the river? I placed that on the map, but it's visible under the building which doesn't look right. I've also got the same problem near the service road which enters the building. ![rendering screenshot][1] [1]: http://i.minus.com/jNdvB9H8mzAeF.jpg

In Leeds, UK, there's a part of the River Aire which goes under the Leeds Armley Industrial Museum. The Aire is represented by a polygon. How should this be mapped? Currently, I've got a multipolygon which the building is placed upon. But how do I map the actual course of the river? I placed that on the map, but it's visible under the building which doesn't look right. I've also got the same problem near the service road which enters the building. ![alt text][1] ![rendering screenshot][1] [1]: http://i.minus.com/jNdvB9H8mzAeF.jpg

In Leeds, UK, there's a part of the River Aire which goes under the Leeds Armley Industrial Museum. The Aire is represented by a polygon. How should this be mapped? Currently, I've got a multipolygon which the building is placed upon. But how do I map the actual course of the river? I placed that on the map, but it's visible under the building which doesn't look right. I've also got the same problem near the service road which enters the building. ![alt text][1] [1]: http://i.minus.com/jNdvB9H8mzAeF.jpg