I did say this blog was about GIS, so here’s the first article to prove it. Hey, I can’t talk about bikes all the time!
The problem: Aerial imagery in 1kmx1km tiles. Three years of acquisition (2007, 2008, 2009) abutting within one tile. Each year’s coverage area is on a separate tile with white space in the remainder of the image. It is impossible to see full coverage of the entire tile because one image is always ‘blanking out’ the other two.
Once again, I’m impressed with the ease, quality and functionality of the QGIS/GRASS stack. A perfect final product, a logical workflow, and lots of flexibility. Thinking further on this, I think the r.mapcalc function would have done the same job as r.patch with proper use of isnull() statements. I haven’t tried this, but suspect it would work. Thoughts?
Posted: March 4th, 2010 under GIS.