# 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
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On Fri, Feb 19, 2021 at 11:49 AM Benedikt Hallinger <b...@hallinger.org>
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
> > <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
> >>
> >> [2]
> >> Mentes a vírusoktól. www.avg.com [2]
> >>
> >> 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 [1] [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] [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
> >>
> >> [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
> > 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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