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PostGIS at 20, The Beginning · Paul Ramsey

Twenty years ago today, the first email on the postgis users mailing list (at that time hosted on yahoogroups.com) was sent, announcing the first numbered release of PostGIS.

The early history of PostGIS was tightly bound to a consulting company I had started a few years prior, Refractions Research. My early contracts ended up being with provincial government managers who, for their own idio. ....

Phil Kayal , Frank Warmerdam , Martin Davi , Chris Hodgson , Daniel Morissette , Jeff Lounsbury , Dave Blasby , Graeme Leeming , Geotools Geoserver , Refractions Research , Spatial Data Option , Sun Ultra , Executive Geospatial Engineer , மார்டின் டேவி , கிறிஸ் ஹோட்சன் , டேனியல் மோரிஸ்சேத்தே , ஜெஃப் லவுன்பரி , சூரியன் அல்ட்ரா ,

A Handy Introduction to Cloud Optimized GeoTIFFs

Since I started working at Planet, I kept hearing about Cloud Optimized GeoTIFFs (COGs). My colleague Chris Holmes even wrote a post explaining what they are and how they’re useful. I decided to implement a Go library to be able to work with COGs. Much of Planet’s satellite imagery is in the GeoTIFF format, including this nice image of Los Angeles from our February 2018 Global Basemap:
An image of Los Angeles from Planet’s February 2018 Basemap. ©2018 Planet Labs Inc, CC BY-SA 4.0.
As a first step to writing a library, I needed to learn about 1) Cloud Optimized GeoTIFFs, 2) GeoTIFFs in general, and 3) even more general than that: TIFFs. I’ve always found binary file formats intimidating they just look like gibberish when you dump them into the console! But there’s logic in that gibberish. Here’s what you can gain from my exploration of this 30-year-old file format. ....

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