The error only occurs when using the EOV (EPSG: 23700) coordinate system. <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> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
On Fri, Feb 19, 2021 at 11:59 AM Balambér Hakapesz <[email protected]> wrote: > # 2021.02.08 created by TopoDroid v 5.0.79 > > #source "../th/kml.th" > source "kml.th" > > layout topodroid > legend on > symbol-hide group centerline > symbol-show point station > debug station-names > endlayout > > export map -layout topodroid -o kml-p.pdf -proj plan > > export map -layout topodroid -o kml-s.pdf -proj extended > > # export model -fomat survex -o kmlth.3d > > export model -output kmlo.3d > export model -output kmlo.lox > export model -output kmlo.dxf > export model -output kmlo.kml > > > > # 2021.02.08 created by TopoDroid v 5.0.79 > > survey kml -title "kml" > > centerline > #cs long-lat > #fix 0 19.009617 47.526453 262 > cs EPSG:23700 #ez felel meg az EOV-nek > fix 0 647151 242509 262 > date 2021.02.08 > # declination 5.0000 degrees > units length meters > units compass clino degrees > data normal from to length compass clino > extend right > 0 1 10.00 180.0 -90.0 > 1 2 10.00 0.0 0.0 > 2 3 10.00 90.0 0.0 > units left right up down meters > data dimensions station left right up down > endcenterline > > endsurvey > > > > > > <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_-6329123508585773583_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > On Fri, Feb 19, 2021 at 11:49 AM Benedikt Hallinger <[email protected]> > wrote: > >> What does the survex/aven file give you, is the error there also >> apparent? >> >> What is your full thconfig file for generating the kml and aven .3d? >> >> Dies the problem also exists when specifying this: >> cs EPSG:4326 >> fix 0 19.009617 47.526453 262 >> >> >> >> Am 2021-02-19 11:25, schrieb Balambér Hakapesz: >> > If I were to enter the ellisoid height, the error of Proj4 would still >> > remain on the EOV projection. >> > I could work in a UTM coordinate system, but it would be much simpler >> > if Therion didn’t recalculate anything. (There is no height issue >> > between UTM and WGS84 because there is no conversion) >> > This error is only present in the national projections where Proj4 >> > performs approximate calculations for the advantage of horizontal >> > coordinates and the disadvantage of height. >> > >> > 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 >> >> >> >> [2] >> >> Mentes a vírusoktól. www.avg.com [2] >> >> >> >> 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 [1] [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] [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 >> >> >> >> [2] >> >> Mentes a vírusoktól. www.avg.com [2] >> > >> > >> > 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_-6329123508585773583_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >
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