therion 5.5.7+0df52bd+dev (2021-02-18) - using Proj 5.1.0, compiled against 5.1.0
On Fri, Feb 19, 2021 at 8:40 PM Balambér Hakapesz <holl.balaz...@gmail.com> wrote: > latest Therion 5.5.7 (now install): > > <LineString><coordinates> > 19.00961011626948,47.52649337576408,*291*.08568208824045 > 19.00961011450532,47.52649337534078,281.08568208855468 > 19.00962225574169,47.52658294585592,281.08562306819113 > 19.00975449765885,47.52657472222689,281.08549506128293 > </coordinates></LineString> > > On Fri, Feb 19, 2021 at 8:19 PM Martin Budaj <m.bu...@gmail.com> wrote: > >> Hi, >> >> which version of Therion and Proj are you using? I get >> 19.00961002698361,47.52649340144701,262.00000000000000 >> in the kml export with the latest Therion and Proj 7.2.1 >> >> Best wishes >> Martin >> >> On Fri, Feb 19, 2021 at 11:25 AM Balambér Hakapesz < >> holl.balaz...@gmail.com> wrote: >> >>> thconfig: >>> #cs long-lat >>> #fix 0 19.009617 47.526453 262 >>> cs EPSG:23700 # Hungarian EOV >>> fix 0 647151 242509 262 >>> >>> kml: >>> <LineString><coordinates> >>> 19.00961011626948,47.52649337576407,291.08568208889801 >>> >>> 291-262 = 29 m = 44m geoid height - 15m Proj4 error >>> >>> >>> >>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >>> Mentes >>> a vírusoktól. www.avg.com >>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >>> <#m_-3468513418640853693_m_2109412960721514408_m_-5536043658431662593_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>> >>> On Fri, Feb 19, 2021 at 11:06 AM Benedikt Hallinger <b...@hallinger.org> >>> wrote: >>> >>>> Isn't EGM84 the reference ellipsoid currently used by WGS84? >>>> What you get with GPS is *not* sea level, but the altitude above that >>>> reference geoid (which takes into account gravital anonalys). >>>> >>>> If you calibrate your barometric altimeter to the hieght given by a >>>> height coordinate of WGS84 (like read from your car's navi at the >>>> parking lot, or from a map calibrated to WGS84) then you should get >>>> about the same altitude. >>>> If you take the cave location from GPS and enter that coordinates into >>>> the therion dataset wirh correct "cs" marking, the conversion should >>>> yield the correct result. >>>> If you take the altitude from a map (or an altimeter calibrated to that >>>> map) in another coordinate system, you have to either apply an offset >>>> manually, add an instrument correction factor in therion, or supply the >>>> correct coordinate system (which then probalby demands conversion of >>>> the >>>> lat/lon coordinates). >>>> >>>> If generating 3D surfce meshes, you also need to supply matching >>>> coordinate systems data and/or specify the correct "cs" parameter. >>>> >>>> I think your problem comes from mixing coordinate systems in respect to >>>> the height model, either at data input or when using the height mesh. >>>> >>>> >>>> Am 2021-02-19 9:49, schrieb Balambér Hakapesz: >>>> > Very rarely can anyone work at ellipsoidal heights. In local >>>> > coordinate systems, it only makes sense for upper geodetic >>>> > calculations. Only for GPS measurements we get an ellipsoidal >>>> > altitude, even there the devices can immediately calculate the >>>> > altitude of the EGM96 model with an altitude above sea level (with a >>>> > few meters error which is not significant compared to the 15m altitude >>>> > error of handheld GPS). >>>> > Proj4 calculates the horizontal coordinates well, but there is a >>>> > serious error in the height coordinates (for special national >>>> > projections >>>> > (http://www.agt.bme.hu/gis/workshop4/eloadasok/proj_poszter_3d.pdf)), >>>> > so it would be better if not we would count on it but leave the >>>> > altitude unchanged. >>>> > Could it be an option not to change the height with Therion? >>>> > >>>> > [2] >>>> > Mentes a vírusoktól. www.avg.com [2] >>>> > >>>> > On Fri, Feb 19, 2021 at 9:18 AM Benedikt Hallinger >>>> > <b...@hallinger.org> wrote: >>>> > >>>> >> Hi there, >>>> >> if you measure the altitude with a barometric device, you do not get >>>> >> the >>>> >> altitude above the ellipsoid. You have to account for that at the >>>> >> input >>>> >> of your data. >>>> >> >>>> >> With the "cs" command you define your input data to be in a specific >>>> >> >>>> >> coordinate system, and also your altitude has to be given in that >>>> >> system. If you just put the barometric altitude there (which you >>>> >> usually >>>> >> did calibrate to a map, didn't you?) you have to transform the >>>> >> altitude >>>> >> manually if the reference altitude differs. >>>> >> >>>> >> Am 2021-02-19 8:44, schrieb Balambér Hakapesz: >>>> >>> Hi! >>>> >>> >>>> >>> When generating 3D models, Proj4 transforms between different >>>> >>> coordinate systems. >>>> >>> This also transforms the ellipsoidal altitude, but the data always >>>> >>> refer to altitude above sea level and should not be changed. >>>> >>> The finished models do not fit the topography, you have to cheat >>>> >> with >>>> >>> the height to be good. >>>> >>> >>>> >>> Balázs Holl. >>>> >>> >>>> >>> [1] >>>> >>> Mentes a vírusoktól. www.avg.com [1] [1] >>>> >>> >>>> >>> >>>> >>> >>>> >>> Links: >>>> >>> ------ >>>> >>> [1] >>>> >>> >>>> >> >>>> > >>>> http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail >>>> >>> _______________________________________________ >>>> >>> Therion mailing list >>>> >>> Therion@speleo.sk >>>> >>> https://mailman.speleo.sk/listinfo/therion >>>> >> _______________________________________________ >>>> >> Therion mailing list >>>> >> Therion@speleo.sk >>>> >> https://mailman.speleo.sk/listinfo/therion >>>> > >>>> > >>>> > Links: >>>> > ------ >>>> > [1] http://www.avg.com >>>> > [2] >>>> > >>>> http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail >>>> > _______________________________________________ >>>> > Therion mailing list >>>> > Therion@speleo.sk >>>> > https://mailman.speleo.sk/listinfo/therion >>>> _______________________________________________ >>>> Therion mailing list >>>> Therion@speleo.sk >>>> https://mailman.speleo.sk/listinfo/therion >>>> >>> >>> >>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >>> Mentes >>> a vírusoktól. www.avg.com >>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >>> <#m_-3468513418640853693_m_2109412960721514408_m_-5536043658431662593_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>> _______________________________________________ >>> Therion mailing list >>> Therion@speleo.sk >>> https://mailman.speleo.sk/listinfo/therion >>> >> _______________________________________________ >> Therion mailing list >> Therion@speleo.sk >> https://mailman.speleo.sk/listinfo/therion >> >
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