Crazy Shapes in TAP

So far when you did spherical geometry in ADQL, you had points, circles, and polygons as data types, and you could test for intersection and containment as operations. This feature set is a bit unsatisfying because there are no (algebraic) groups in this picture: When you join or intersect two circles, the result only is … Continue reading “Crazy Shapes in TAP”

The Bochum Galactic Disk Survey

About a year ago, I reported on a workshop on “Large Surveys with Small Telescopes” in Bamberg; at around the same time, I’ve published an example for those, the Bochum Galactic Disk Survey BGDS, which used a twin 15 cm robotic telescope in some no longer forsaken place in the Andes mountains to monitor the … Continue reading “The Bochum Galactic Disk Survey”

DaCHS is Bustered

DaCHS is developed on Debian, and Debian is the recommended deployment platform. Hence, a new major release of Debian (where major means for them: We may break stuff) is always a big thing for me. And so it was with the release that came in July, codenamed “buster”. Both on the “big thing” and on … Continue reading “DaCHS is Bustered”

Space and Time not lost on the Registry

If you are an astronomer and you’ve ever tried looking for data in the Virtual Observatory Registry, chances are you have wondered “Why can’t I enter my position here?” Or perhaps “So, I’m looking for images in [NIII] – where would I go?” Both of these are examples for the use of Space-Time Coordinates (STC) … Continue reading “Space and Time not lost on the Registry”

GAVO at the Northern Spring Interop

Every half year, VO enthusiasts from all over the world gather for an “Interoperability conference”, or Interop for short. The latest such event, the Shanghai Interop 2017, ended Friday a week ago. It has been a “long” one again after the short southern spring Interop in Trieste last year (featured in this blog). As usual, … Continue reading “GAVO at the Northern Spring Interop”