Tuning the Rasterizer

I'm not sure anyone cares about this kind of thing, but...




These are pictures of a test of the rasterizer. The rasterizer is code in both the DSF creator* and X-Plane that converts polygons into lines or boxes. What good is that? We use it to:

• Plant trees inside a polygonal forest in a DSF.
• Process all of the elevation points inside a polygonal water body when making a DSF.

Etc., etc. These were from a performance test rasterizing the Mississippi delta at 1201 x 1201; because the vector data is insanely detailed (something like 2 million line segments I think) it's a good test of performance. The blue lines represent a line fit, but the white lines are a "box fit" - that is, they ensure that not only are they "inside" the water, but the area above and below them are too.

* Programming geeks can use this code - it's in PolyRasterUtils.