Can MapViewer display spatial data in different projections?
Yes. Prior to version 10.1.2, all the spatial data rendered by MapViewer had to be in the same spatial reference system (SRS). If your data comes from different sources and they use different SRS’s, you had to explicitly use Oracle Spatial’s coordinate system functions to transform them into a single reference system for viewing purposes. Starting with 10.1.2, MapViewer can now perform on-the-fly projection of your spatial data. To enable this, you must specify a master srid in your map request. If a theme being requested has a different srid for its data, MapViewer will invoke Spatial’s coordinate transformation functions to transform that theme’s data into the master srid. The transformation is done in the database server as part of the query. The result is sent to MapViewer for rendering. The original data in the database will not be modified.
