Raster access speeds… and size limits

 

I need to be able to handle large raster images, and to be able to find values from cells very quickly.

There are many ways to do this…. here’s a look at a few:

Method	Handles GeoCoords	Max Size	Read Access Speed
DOTSPATIAL Raster	Yes	Medium (9k x 9k)	2.6 million per second
C# dictionary	No	Small (5k x 5k)	50 million per second
EMGU IMGs	No	Large (30k x 30k)	3.2 million per second
C# BMP (.net)	No	Medium (9k x 9k)	1 million per second
C# FastBMP	No	Medium (9k x 9k)	33 million per second
Rasterlite	Yes	Large (internal tiling)	(to do)
GDAL	Yes	Large	(to do)
R (grids)	(to do)	(to do)	(to do)
XNA texture	No	Small   (4k x 4k)	(to do)