Recently (ok, I have been working on-and-off on this for longer than I’d like to admit) we needed to solve a least cost path problem. I poked around and looked at a few solutions. One was in Jared Erikson’s Python GDAL/OGR Cookbook which was fun to play with. This is a fun solution as it’s pretty low level, so you can see all the parts and … Continue reading Least Cost Path or How to Avoid Volcanoes with GrassGIS
I have done a small smattering of posts over the years on cartography and parks. I thought I would share in this post some of the work we have done toward this end for mobile and desktop web. The app itself (still awaiting a full port to webgl) can be found here. Here we take a bit of inspiration from NPS Maps and some of … Continue reading Cartography and Parks
There exist all sorts of interesting point cloud classification approaches, many of them open source and accessible. A set of particularly interesting ones have been released recently via the Computational Geometry Algorithms Library, or CGAL. The description of the CGAL from their web page is as follows: CGAL is a software project that provides easy access to efficient and reliable geomeric algorithms in the form of a … Continue reading Classifying point clouds with CGAL
Reblogged from the OpenDroneMap blog. Recent posts have detailed the improvements in the digital elevation products from OpenDroneMap that are forthcoming, and we are really excited about those. That code is now relatively mature and likely usable for your use case, with only a couple of caveats: The first caveat is that the processing for point clouds takes 3-4 times as long. That said, the … Continue reading Better 3D all the time
(Reblogged from the OpenDroneMap blog) Ok, so far what is available is broken code but that will be fixed. You can check it out in the meantime in this pull request. It calculates the full depthmaps, but does not yet write the PLY file needed for subsequent steps. The trick to improve DEMs was already in our build process: for elevation models, MVE’s dmrecon utility … Continue reading Digital Elevation Model Improvements, cont. with code!
(Reposted from the OpenDroneMap Blog) DEM Improvements continued, this time with an animated gif, a little hillshading, and a modicum of intelligent smoothing. Continue reading Digital Elevation Model Improvements, continued
(Reposted from: the OpenDroneMap Blog) We have some cool new-to-us approaches in the works for digital elevation models. Here’s a quick teaser and comparison old to new. This is a digital surface model over some buildings, fences, and trees in Dar es Salaam: Continue reading Better Digital Elevation Models for Everyone
(Originally published here: https://www.opendronemap.org/2018/11/water-runs-downhill/) Water running downhill is a challenge for elevation models derived from drone imagery. This is for a variety of reasons, some fixable, some unavoidable. The unavoidable ones include the challenges of digital terrain models derived from photogrammetric point clouds, which don’t penetrate the way LiDAR does. The avoidable ones we seek to fix in OpenDroneMap. The fixable problems include poorly … Continue reading Water runs downhill
There is no excerpt because this is a protected post. Continue reading Protected: A Sequel on Gorillas, Pythons, Pandas and some computer code
I had the privilege last summer of attending State of the Map Africa, and getting some insight into the status of OpenStreetMap on the continent. This year, almost as a followup, FOSS4G Dar es Salaam was held in conjunction with the Humanitarian OpenStreetMap Team’s Summit. And so it was that FOSS4G this year was one part FOSS4G, one part HOT, and one part Tanzania, all … Continue reading Women and FOSS4G / HOT Summit in Africa
Smathermather's Weblog 