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Updated Use Cases (markdown)

tschaub
2013-04-04 08:20:36 -07:00
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Use-Cases.md
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@@ -38,6 +38,8 @@ _Questions/comments from Eric:_
How do we know that the transform's source projection is EPSG:4326? It's not specified anywhere in the application code. Maybe you assume that the user/external projection is EPSG:4326 by default? How do we know that the transform's source projection is EPSG:4326? It's not specified anywhere in the application code. Maybe you assume that the user/external projection is EPSG:4326 by default?
**Answer from Tim**: GeoJSON describes the CRS. For formats that don't describe their CRS, the user would provide a projection property on the source.
You say that "This alternative can be implemented if the layer knows the map projection". Why? The layer renderer knows about the map/view projection, so I think it could be the one providing the projection (the transform's target projection). As I see it the transform operation would occur during the first `render` pass, the one occurring when the layer is added to the map. You say that "This alternative can be implemented if the layer knows the map projection". Why? The layer renderer knows about the map/view projection, so I think it could be the one providing the projection (the transform's target projection). As I see it the transform operation would occur during the first `render` pass, the one occurring when the layer is added to the map.
I've also been thinking about where to store the transformed data. But before that: in most cases, do we really want/need to store both the original data and the transformed data? I'd say no. I've also been thinking about where to store the transformed data. But before that: in most cases, do we really want/need to store both the original data and the transformed data? I'd say no.