3D, Drone, Image Processing, Optics, Photogrammetry, UAS

Inventorying linear assets– really high resolution orthos

I have been contemplating all sorts of varied uses of Structure from Motion techniques. One of those outputs, in addition to using sUAVs (drones) is just to orthorectify and generate 3D meshes from ordinary photos. This has really great potential for linear assets like streams and rivers, trails and roads. We’ll have to being to contemplate how we’ll use (and summarize!) the incredible amount of … Continue reading Inventorying linear assets– really high resolution orthos

Unknown's avatarsmathermatherLeave a comment
Cartography, Recreation, TileStache, Trail Curation, Trails

Parks Data Cake, part deux

Following up on my previous post, I have started to detail the how of our parks map rendering works, including a GitHub repository with all the code and data to build your own in TileStache. One of these days, we’ll port this to TileMill, but in the mean time, it works and works wonderfully.   — Addendum — Truth in advertising– the contours data were … Continue reading Parks Data Cake, part deux

Unknown's avatarsmathermatherLeave a comment
PostGIS, PostGIS Cookbook

Packt Sale — 2 books for the price of one

Now I feel like a salesman. I feel obliged to mention the Packt buy one get one free sale (ends tomorrow): http://www.packtpub.com/?utm_source=referral&utm_medium=marketingPR&utm_campaign=2000thTitle If you want a postgresql title to go with the PostGIS Cookbook (just sayin’): http://www.packtpub.com/search?keys=postgresql&sort=0&types=0&forthcoming=1&available=1&count=20&op=Go Ok. Enough. Back to fun reading:   Continue reading Packt Sale — 2 books for the price of one

Unknown's avatarsmathermatherLeave a comment
Cartography, Recreation, TileStache, Trail Curation, Trails

Parks Data Cake

Stamen has a great blog entry on mapping for parks on their blog. It’s a teaser for a deeper dive in mapping parks, and I’m staying tuned, as their write-ups tend to be detailed, thoughtful, and complete. I thought I’d offer my own teaser– a bit of work done collaboratively with GreenInfo Network.  It started with their basemap– something they spent a few person-years refining from … Continue reading Parks Data Cake

Unknown's avatarsmathermather4 Comments
GDAL

Custom projections using spatialreference.org and gdal

Every now and then I get the urge to define my own projection. Usually, I sit down for a while, hit my head on the wall, and the urge passes. For a few years I have worked with the Lake Erie and Allegheny Partnership for Biodiversity on various projects. Now we are getting deep into region-wide data collection, and so I decided to define an … Continue reading Custom projections using spatialreference.org and gdal

Unknown's avatarsmathermather3 Comments
Database, PostGIS, PostGIS Cookbook, PostgreSQL, SQL

PostGIS Cookbook(s)

This is starting to feel real… PostGIS Cookbook(s).  2904 pages. Page count for a single book can be calculated as in the following code: The preceding query will result in the following: A special thanks to my family, my co-authors, all the contributors to PostGIS, and to Regina Obe for helping me through the hardest bit of code in my part of the book. Check … Continue reading PostGIS Cookbook(s)

Unknown's avatarsmathermather3 Comments
3D, Bundler, Camera Calibration, Drone, Image Processing, Optics, Photogrammetry, PMVS, UAS

Short follow up: Photogrammetrically Derived Point Clouds

In my previous post, https://smathermather.wordpress.com/2014/02/04/big-dmn-post-photogrammetrically-derived-point-clouds/, I briefly cover software for creating photogrammetrically derived point clouds.  I didn’t summarize, like this, but PDPCs can be created in three easy steps: Structure from Motion for unordered image collections Clustering Views for Multi-view Stereo Multi-view stereo (dense point cloud reconstruction) But, unfairly, I gloss over some of the complications of creating meaningful data from PDPC processing. Truth told, … Continue reading Short follow up: Photogrammetrically Derived Point Clouds

Unknown's avatarsmathermatherLeave a comment
3D, Bundler, Camera Calibration, Drone, Image Processing, Optics, Photogrammetry, PMVS, UAS

Big d@mn post: Photogrammetrically Derived Point Clouds

I chatted with Howard Butler (@howardbutler) today about a project he’s working on with Uday Verma (@udayverma @udaykverma) called Greyhound (https://github.com/hobu/greyhound) a pointcloud querying and streaming framework over websockets for the web and your native apps. It’s a really promising project, and I hope to kick the tires of it really soon. The conversation inspired this post, which I’ve been meaning to do for a … Continue reading Big d@mn post: Photogrammetrically Derived Point Clouds

Unknown's avatarsmathermather4 Comments