I ran these tests a while back, but I’m just getting to post them now. These were run on a late model MacBook Pro, with a 2.4GHz Intel Core 2 Duo, with a couple of gigs of RAM on PostgreSQL. In Postgre, if I run SELECT version(); I get: PostgreSQL 8.4.1 on i386-apple-darwin10.0.0, compiled by GCC i686-apple-darwin10-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5493), 64-bit My … Continue reading PostGIS and LiDAR, the saga continues
I loaded a set of contours into the database that are really nice, up-to-date LiDAR and breakline derived contours. The are engineering grade aerial contours, but they are a very big and complex dataset. So I’ve done what I had hoped was the hard part, using shp2pgsql, I’ve converted them to PostGIS insert statements and dumped them into the database only to find that some … Continue reading Clipping Data
I completed this project a long time ago and have not blogged on it in over a year. None-the-less, I realized that I hadn’t posted any final images for the viewshed analysis with Povray. So here is the summer viewshed analysis. This is rendered with about (I think) 150,000 trees, each with 100,000+ leaves. The cell tower here is in red. The landscape colored in … Continue reading Viewshed Analyses in Povray– Final Image
Just another shot of our digital surface model of the forest. This time, I rendered it with all of the trees at base elevation 0 (zero), placed the orthographic camera at height 150, so our 16-bit range we’re rendering to should scale 0-150 feet to 0-65535 values, giving us a precision of 0.002 feet. The original LiDAR data has a precision of 0.01 feet, so … Continue reading Digital Surface Model– a whole forest and more part Deux
Let’s start putting some of the pieces together. Earlier, I presented a method for deriving a digital surface model from LiDAR data of a forest canopy, using a tree-shaped interpolator that scales the individual tree canopy shapes according to the height of the LiDAR return from the ground. Now I present the whole project, forest and all. I wanted to render my DSM at a … Continue reading Digital Surface Model– a whole forest and then some
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