Category: SFCGAL

3D, Database, PostGIS, PostgreSQL, SFCGAL, SQL

The easiest way to get PostGIS and friends running:

Docker.  See: https://github.com/vpicavet/docker-pggis for a quick and easy Docker running PostGIS. Understand, this isn’t production ready (the connection permissions make my teeth hurt a little) but, so nice to have a one stop shop for postgis, pgrouting, and pointcloud. Now I may have to write blog posts on pointcloud. Point cloud didn’t get in the PostGIS Cookbook because it was too hard to build. I … Continue reading The easiest way to get PostGIS and friends running:

smathermather7 Comments
3D, Analysis, Database, Drone, Image Processing, Optics, Other, Photogrammetry, PostGIS, PostgreSQL, QGIS, SFCGAL, SQL, UAS

UAS (drone) Footprint Geometries Calculated in PostGIS with SFCGAL — for real this time

In my earlier post, I made a claim that SFCGAL was used in this figure: It dawned on my afterwards, while I was using 3D, I hadn’t actually employed any of the analysis goodies that come with SFCGAL.  Well, here it is– a footprint as calculated using the view angles and a real terrain model: Here it is compared with the initial calculation: Continue reading UAS (drone) Footprint Geometries Calculated in PostGIS with SFCGAL — for real this time

smathermather3 Comments
3D, Database, PostGIS, PostgreSQL, SFCGAL, SQL

More cutting room floor stuff… — 3D pyramid maker

A little more leftover code from the PostGIS Cookbook— a little tool for making pyramids for SFCGAL enabled PostGIS databases. https://github.com/smathermather/postgis-etc/blob/master/3D/pyramidMaker.sql Edit:  Actually, I think this would work without SFCGAL, but what would be the point… . Edit 2:  Let’s embed some code:   Continue reading More cutting room floor stuff… — 3D pyramid maker

smathermatherLeave a comment
3D, Database, PostGIS, PostgreSQL, SFCGAL, SQL

More cutting room floor stuff… .

ST_3DIntersection performs volumetric intersections for us in PostGIS, if we have SFCGAL enabled for our PostGIS back end.  Much like a normal PostGIS intersection, this is the mathematical definition of an interesection, so it returns the volumetric portion of the intersection, plus 3D linestrings and 3D points and other bits and pieces that qualify for the intersection.  As a little patch, I wrote a quick … Continue reading More cutting room floor stuff… .

smathermather4 Comments
3D, Analysis, Database, Drone, PostGIS, PostgreSQL, SFCGAL, SQL, UAS

O man. Epic 3D on its way. I could drone on and on about #postgis

Still working furiously on final edits for the PostGIS Cookbook.  My last chapter is the last one that the Packt editors and managers are waiting for, but it will be the best I’ve contributed to the book, so I think it will be worth everyone’s time. The trick with this chapter is that when I first wrote it, it was before the heavy lifting the … Continue reading O man. Epic 3D on its way. I could drone on and on about #postgis

smathermather7 Comments
3D, Analysis, Database, PostGIS, PostgreSQL, SFCGAL, SQL

ST_Extrude screen shot: PostGIS with SFCGAL

I have been working a bit to get horao working to visualize PostGIS 3D data.  In the mean time, I have a little work around for viewing 3D extrudes a 3Dish way (i.e. isometric) The nightly build of QGIS now allows you to visualize polyhedral surfaces, the output type of ST_Extrude.  So, I cheated.  ST_Extrude takes 4 parameters: an input geometry, and extrusion along the … Continue reading ST_Extrude screen shot: PostGIS with SFCGAL

smathermather1 Comment