Changes between Version 6 and Version 7 of MapGuideRfc51

Timestamp:

07/14/08 16:30:45 (16 years ago)

Author:

tonyfang

Comment:

--

MapGuideRfc51

@@ -36 +36 @@
 We will use a tessellation algorithm to re-project the raster data from one coordinate system to another.
 
-The original image will be divided into a grid of triangles representing the raster in its own coordinate system. Each point on the grid (representing the corners of the triangles) will be transformed into the target coordinate system, and the raster data within each triangle will be transformed appropriately to fit within the new geometry.
+We must first determine how much of the original image is required for our re-projection. The extents of the current viewport must be re-projected into the coordinate system of the original image. The extents of the re-projected viewport need to be determined. This is the portion of the original image that will be required to re-project the image into the current viewport.
+
+The original image (the portion required for the re-projection) will be divided into a grid of triangles representing the raster in its own coordinate system. Each point on the grid (representing the corners of the triangles) will be transformed into the target coordinate system, and the raster data within each triangle will be transformed appropriately to fit within the new geometry.
+
 
 [[Image(raster_reprojection.PNG)]]