NTRIP (Networked Transport of RTCM via Internet Protocol) is a protocol to get the RTK corrections in your GPS device which is frequently used nowadays.

Neither RTCM3 messages (as of version 3.3 of the standard), nor the NTRIP handshake include any clarification about the coordinate reference system (CRS) that applies to the corrected coordinates.

"NTRIP-catalog" is an open-source open-data project to create a database that will allow any application to get a good understanding of the CRS that should be used with each provider.

This talk will explain the initial problem, how it is a nightmare for many users, and how we try to fix it with this project that is open to NTRIP providers and consumers.

Mercator projection is nowadays hated by many people. A movement started (at least) in the 1970's by Arno Peters. However it has unique properties that other projections miss. Those properties are useful not only in surveying (big scales), but also in worldwide data representation (small scales).

This talk will explain the pros and cons of the Mercator projection and compare it to other projections. It will explain how to measure distances in any projection. I hope it will give hints to decide which projection to use depending on the purpose of the map.