Comments (28)
yes but there are many many other methods (=projection methods whithout ellipsoid projections)
so this is only! for ellipsoids
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in germany also b=Breite l=Länge h=Höhe
maybe the russian was taking over the german
but nowadys rather everywhere lat and lon are common
I can later add this to the manual and we leave blh...
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shall we add for all a separate file?
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could be also possible. Do you mean the helmparms3d output format?
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updated
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Relax, @dr-ni .
We don't have a single projection algorithm.
B-L-H <-> X-Y-Z translation is a translation from one kind of 3D coordinates to another kind of 3D coordinates. 3D!!!
It's just that X-Y-Z depends only on the center point and three vectors, and B-L-H depends on the whole 3D figure - an ellipsoid. But both of these systems are 3D, without projections.
Dont worry, be happy.
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yes, but this is only working for ellipsoid projection methods, isn't it?
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Not, @dr-ni .
This works for ellipsoids. Without any projections.
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Not, @dr-ni .
We do not use any (ANI!) projections.
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I know but what is with all those other stuff that is not based on ellipsoidal coordinate systems
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@dr-ni say:
but what is with all those other stuff
- https://proj.org
- https://github.com/Geo-Linux-Calculations/geofindkey
- https://github.com/Geo-Linux-Calculations/gnumeric-ols/tree/master/spreadsheets/conformaltrans
- https://github.com/Geo-Linux-Calculations/gauss-kruger
- https://github.com/Geo-Linux-Calculations/geoconformimage
- https://github.com/ImageProcessing-ElectronicPublications/photoquick-examples/tree/main/plugins/transform/geometry
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off course - this was what I was thinking about
if we support ellipsoids we also should support any other common local/global coordinate transformation
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@dr-ni say:
we also should support any other common local/global coordinate transformation
Not. I introduced the B-L-H <-> X-Y-Z transformation, only because the B-L-H representation is more common and this transformation is not projective.
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nice paper :-)
to avoid further missunderstanding - should we use instead of blh lat lon h
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@dr-ni say:
instead of blh lat lon h
And what is the short entry? This one doesn't go anywhere.
"The "latitude" (abbreviation: Lat., φ, or phi)"
"The "longitude" (abbreviation: Long., λ, or lambda)"
In Russia geodesic "latitude" - B, geodesic "longitude" - L.
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are spheres also working with helmeltrans
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@dr-ni say:
are spheres also
Yes. They are sometimes used to machine spherical triangles. This is an approximation, but very good.
@dr-ni say:
shall we add for all a separate file?
Crazy?! Dirty repository! Who needs to create it himself. Just put this file in a "prominent place".
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ok, so we add the file to the ellipsoids folder?
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@dr-ni say:
ok, so we add the file to the ellipsoids folder?
Not. To the documentation. Next to README.md
PS: Crazy thought: Shouldn't we make a separate helmert3d-data, hang up a banner there about collecting transformation matrices? Such a warehouse "with the world by thread".
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@dr-ni say:
Do you mean the helmparms3d output format?
Yes.
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but has to be checked always if correct and no spam
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@dr-ni say:
but has to be checked always if correct and no spam
Issues are always open. Kind people will tell you.
PS: I said that the idea is delusional.
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ok can you open it?
I'll add the file to the repo, anyway
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@dr-ni say:
ok can you open it?
I am a disgusting "marketer". This business will not go with me in charge. Let's leave crazy ideas to posterity.
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ok
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Hi @dr-ni
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I'm asking myself if this upgrade is a reliable one?
many precisions are so unrealistic, for example WGS84:
WGS_84 6378137.0 6356752.3142451793
0.0000000003 m precisions????!!!
for example 1 Å = 100 pm = 0.1 nm = 10^{−10} m
The Ångström is used in particular in crystallography and chemistry to be able to work with "simple" numerical values. 1 Å is the typical order of magnitude for atomic radii and distances between atoms in crystal structures and bond lengths in molecules. Even the moon forces the earth surface around ±50 cm
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@dr-ni . The initial values are a
and 1/f
. I already wrote about this. The polar axis b
is calculated b=a*(1-f)
. Number of characters for storage only f
.
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Related Issues (9)
- Release? HOT 31
- Links? HOT 10
- towgs84 parameter HOT 51
- Ellipsoid? HOT 3
- Residual analysis HOT 4
- Optional? HOT 2
- Compare and test data? HOT 1
- Calculate NTV2 grid HOT 2
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