Hi, As you mentioned we decided for SI units and we should stick to that.
As the value is a float anyways, I can't see any advantages in moving from SI as "tansport unit". Nevertheless it is unhandy. So I'd use the SI unit and add a getter methods "toNanoTesla()" to get readable values (according to base/time.toMilliseconds()) This way, the use of a non-SI unit is clearly visible in the source code. Steffen Am 07.07.2014 14:47, schrieb Leif Christensen: > Hi, > > do we have a standard unit / convention for magnetometer readings? > > In the xsens_imu and imu_xsens drivers, we are just forwarding the > values from the xsens, which confirms to no standard at all (arbitrary > unit with 1 being the magnetic field strength at calibration time in > Enschede, Netherlands). The stim300, imu_kvh_1750 have no magnetometer > inside. > > Some are using Tesla, some Gauss (10^-4 T). > > Most of the time we are interested in the magnetic flux density of the > (distorted) earth magnetic field, which ranges from 30µT (equator) to 60 > µT (pole). > > Apart from being the derived SI unit, Tesla is a little bit unhandy for > these ranges, I think. But if we have a standard there, I would go with > that. If not, I would either propose µT or Gauss. > > Total magnetic field strength today in Bremen (IGRF11 model): > 49429.8 nT > 49.4298 µT > 0.494298 G > 0.0000494298 T > > LG, > Leif > -- Steffen Planthaber Weltraumrobotik Besuchsadresse der Nebengeschäftstelle: DFKI GmbH Robotics Innovation Center Robert-Hooke-Straße 5 28359 Bremen, Germany Postadresse der Hauptgeschäftsstelle Standort Bremen: DFKI GmbH Robotics Innovation Center Robert-Hooke-Straße 1 28359 Bremen, Germany Tel.: +49 421 178 45-4125 Zentrale: +49 421 178 45-0 Fax: +49 421 178 45-4150 (Faxe bitte namentlich kennzeichnen) E-Mail: [email protected] Weitere Informationen: http://www.dfki.de/robotik ----------------------------------------------------------------------- Deutsches Forschungszentrum fuer Kuenstliche Intelligenz GmbH Firmensitz: Trippstadter Straße 122, D-67663 Kaiserslautern Geschaeftsfuehrung: Prof. Dr. Dr. h.c. mult. Wolfgang Wahlster (Vorsitzender) Dr. Walter Olthoff Vorsitzender des Aufsichtsrats: Prof. Dr. h.c. Hans A. Aukes Amtsgericht Kaiserslautern, HRB 2313 Sitz der Gesellschaft: Kaiserslautern (HRB 2313) USt-Id.Nr.: DE 148646973 Steuernummer: 19/673/0060/3 ----------------------------------------------------------------------- _______________________________________________ Rock-dev mailing list [email protected] http://www.dfki.de/mailman/cgi-bin/listinfo/rock-dev
