FOSS4G UK 2022 – Sparkgeo represent at key open-source conference
The UK “free and open-source software for geo” (FOSS4G) community came together on November 17th to celebrate PostGIS Day.
open source
STAC it up – A STAC tutorial
In this post we describe the process of taking a federal Canadian dataset and creating a SpatioTemporal Asset Catalog (STAC) using python.
STACLint: Validate your STAC
STACLint is an online validation tool for STACs. With it, you are able to validate STAC catalogs, collections, and items by supplying either a URL or JSON. The tool will crawl nested catalogs and report any errors it finds as it crawls through.
Disparate Data, Technology Fiefdoms (and 65 Pictures of Your Cat) – Video
Will Cadell (@geo_will) presented at FOSS4G 2014. He talked about the importance of considering the commonwealth of data when publishing open data products. Check out his presentation here >>> Presentation Description Up in the frozen wastes of the Northern British Columbia, we organized a hackathon. We based it on the ideas of open data and […]
Turning Down the Noise with Nearblack
What’s all the racket? These little artifacts along the edge of the data look like they should be considered nodata however they show up despite setting the nodata to be transparent. Turns out these cells are slightly off-white and were likely introduced during JPEG compression. This can happen with both 0 (black) and 255 (white) nodata values.
Making the US Census Database Show Up On a Google Map
I wrote up how to build a US Census Tract database earlier. However, we all know that data without a way of showing it on a map, is a little sad. So I wrote up the process I used to make it all available on a Google Map. The process involves the use of PostGIS, Mapnik, […]
Building a US Census Tracts PostGIS Database
This article shows how you (yes, you!) can build your very own US Census Tracts PostGIS database. I had looked over the interwebs for some time under the false assumption that someone, somewhere would have already done this, but it seems not. So this article documents my process. I am running a mac, so some […]
Python Geospatial Development Published
Will Cadell was recently a technical reviewer on the latest edition of Python Geospatial Development. Go check it out on amazon here Here’s the brief: Geospatial development links your data to places on the Earth’s surface. Writing geospatial programs involves tasks such as grouping data by location, storing and analyzing large amounts of […]
ogr2ogr 3D Shapefile Import to PostGIS Tip
A very quick tip for those scratching their heads over trying to import a 3D shapefile (which doesn’t actually have any 3D data, or at least none you care about) into a flat (2D) PostGIS data set and you keep getting a geometry constratint error. with a command like: ogr2ogr -update -append -f PostgreSQL PG:”dbname=postGISdatbase” […]
Using Prepared Geometries in Shapely
Shapely is a great tool for the geospatial developer. With Shapely it is possible to run PostGIS-like operations on non-PostGIS geometries. This can keep your python code looking smooth and consistent. In my experience it can also go rocket fast in certain applications. One of those applications is where you are using the same geometry […]