Yes, it is necessary, we are forced to cheat at the Hungarian EOV coordinates. Thanks. I'm looking forward to the Windows installer.
Balázs. On Mon, Feb 22, 2021 at 9:19 PM Martin Budaj <[email protected]> wrote: > Hi, > > Proj 4 and 5 uses a different conversion than Proj 6+ resulting in the > height difference. > > Actually, the behaviour of Therion was inconsistent: when doing internal > conversions it transformed only x and y coordinates, but when creating e.g. > KML output it transformed all x, y and z coordinates. The latest commit > (b6bcc92) unifies this to converting just x and y for all coordinate > systems transformations. > > If there is a real need for a switch between converting and not converting > the heights, let us know. > > Martin > > On Fri, Feb 19, 2021 at 8:41 PM Balambér Hakapesz <[email protected]> > wrote: > >> 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 < >> [email protected]> 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 <[email protected]> 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 < >>>> [email protected]> 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_-8081509530659361150_m_1264032343771874480_m_-3468513418640853693_m_2109412960721514408_m_-5536043658431662593_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>>>> >>>>> On Fri, Feb 19, 2021 at 11:06 AM Benedikt Hallinger < >>>>> [email protected]> 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 >>>>>> > <[email protected]> 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 >>>>>> >>> [email protected] >>>>>> >>> https://mailman.speleo.sk/listinfo/therion >>>>>> >> _______________________________________________ >>>>>> >> Therion mailing list >>>>>> >> [email protected] >>>>>> >> 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 >>>>>> > [email protected] >>>>>> > https://mailman.speleo.sk/listinfo/therion >>>>>> _______________________________________________ >>>>>> Therion mailing list >>>>>> [email protected] >>>>>> 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_-8081509530659361150_m_1264032343771874480_m_-3468513418640853693_m_2109412960721514408_m_-5536043658431662593_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>>>> _______________________________________________ >>>>> Therion mailing list >>>>> [email protected] >>>>> https://mailman.speleo.sk/listinfo/therion >>>>> >>>> _______________________________________________ >>>> Therion mailing list >>>> [email protected] >>>> https://mailman.speleo.sk/listinfo/therion >>>> >>> _______________________________________________ >> Therion mailing list >> [email protected] >> https://mailman.speleo.sk/listinfo/therion >> > _______________________________________________ > Therion mailing list > [email protected] > https://mailman.speleo.sk/listinfo/therion >
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