Not surprisingly, I made some mistakes in the Lidar Shootout blog, not the least of which is the location and affiliation of Etienne Racine and Pierre Racine out of Montreal Laval University in Quebec City. I jumped the gun on stats too, so we’re working on pounding out the details of the final numbers for the shootout… . More charts and numbers forthcoming… . Continue reading LiDAR Shootout! — Revisions
I’ve spent little time looking at the formatting on my blog. As the code has gotten longer, it’s gotten unacceptable that tabs and other formatting don’t show up correctly. A little google-fu and thanks to this blog post: http://www.sohtanaka.com/web-design/styling-pre-tags-with-css-code-block/ I’ve reformated 25+ of my posts with more readable code with tabs and the whole bit. I could go through and reformat everything, but I probably … Continue reading HTML Tags for code pre & code tags
Just a plug for Civic Commons, a network dedicated to: “Let’s Save the Public Millions of Dollars “Government entities at all levels face substantial and similar IT challenges, but today, each must take them on independently. Why can’t they share their technology, eliminating redundancy, fostering innovation, and cutting costs? We think they can. Civic Commons helps government agencies work together. ” I haven’t used Civic … Continue reading Civic Commons
This will be a very quick post today. We wanted to use some historical USGS quads for analysis. We had a ready source, used ArcGIS to georeference them to a grid, but then wanted something approaching a seamless product. Enter gdal. First step, create an image to put the mosaic into: gdal_merge -o usgs_merge.tif -createonly input1.tif input2.tif … Then mosaic into that. Since we have … Continue reading Historical USGS Quads
Start-up scripts in Debian Linux aren’t exactly straight forward for the un-initiated. Actually, if memory serves me, they aren’t any more straight forward on Ubuntu Linux either, but such is heredity. We are transitioning some of our GeoServer instances over to 64-bit Debian Linux. In my test Ubuntu environment, I had a hack in place to force the Tomcat Java Servlet to launch on startup, … Continue reading Debian Configuration– Tomcat on Boot
I’ve said before that I work in a hybrid shop– part ESRI, part Open Source. We use GeoExt/OpenLayers/GeoServer/PostGIS for the Enterprise stuff, and ESRI for the analyses, some specialized cartography, and the easy way out on one-off projects. I mostly blog about the Open Source stuff, ’cause that’s where my heart (and budget) lays. So, now for some ESRI Fan geek-dum. Plus the obligatory work … Continue reading ArcGIS, Layer Packages and Workarounds
IMCORR is a package distributed by the National Snow and Ice Data Center (did you know we have one of those?), or NSIDC, that performs image cross correlation between two images using a comparison between a moving image chip in each image. It measures the displacement (in pixels) between the objects found in the two images, and writes that out to a text file. It … Continue reading IMCORR– using image correlation to georeference an image
At home, I work on a Mac, so when I want to do work here, my scripting language changes. In this case, I prefer BASH as my control script. I downloaded libLAS and did the standard Unix ./configure, make, sudo make install dance in the decompressed libLAS directory ./configure make sudo make install Now I have some tools to manipulate LiDAR las files at home. … Continue reading LiDAR data in BASH using libLAS
Just as I’ve started getting good traffic on this blog, a collegue and I have started another one called Anantasesha, largely on the GIS stack we’re putting together for internal use, but also may include some interesting other bits of code and musings. Check it out: http://anantasesha.wordpress.com Continue reading Another Blog
Smathermather's Weblog 