Re: [osg-users] convertLatLongHeightToXYZ

[Robert Osfield]

On 12 November 2016 at 08:56, Rambabu Repaka  wrote:
> Hi,Can anyone post a code where function converts latitude,longitude,height 
> to x,y,z and returns the x,y,z coordinates in osg.

You don't need anyone to post code for you, if you have the OSG you
already have the code. Just look at the OSG examples that use the
osg::EllipsoidModel.  You really shouldn't need the community to hand
hold you through every line of code.

Robert.
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Re: [osg-users] convertLatLongHeightToXYZ

[Rambabu Repaka]

Hi,Can anyone post a code where function converts latitude,longitude,height to 
x,y,z and returns the x,y,z coordinates in osg.

... 

Thank you!

Cheers,
Rambabu

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Re: [osg-users] convertLatLongHeightToXYZ

[lucie lemonnier]

Hi,

Thank you everyone for your replies.
In fact, I made a mistake because I built my terrain with VPB with the option 
--geocentric so my terrain is geocentric. I didn't remember anymore. In fact, I 
rotate the terrain and that's why it seem flat. But your answers helped me a 
lot because I might build flat terrain.

Thank you!

Cheers,
lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[lucie lemonnier]

Hi,

In fact, my model is not spheroid, it is a flat terrain.
That's why I need simply the position.

Thank you!

Cheers,
lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC]

Lucie,

If you're on a flat earth, you shouldn't be using the
convertLatLongHeightToXYZ method. This is only used for mapping spheroid
coordinates to geocentric (origin is at the center of the spheroid)
coordinates. Because you were referencing this method, it was assumed that
you were using this type of mapping.

If you want to get X,Y from a Lat,Long pair, you need to use some other
projection or mapping. You could use a Plate Carree projection or something
similar http://en.wikipedia.org/wiki/Equirectangular_projection. May I also
suggest that you use something like GeoTrans or GDAL to assist you in what
you need to do.

-Shayne

-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of lucie
lemonnier
Sent: Friday, October 01, 2010 3:06 AM
To: osg-users@lists.openscenegraph.org
Subject: Re: [osg-users] convertLatLongHeightToXYZ

Hi,

In fact, my model is not spheroid, it is a flat terrain.
That's why I need simply the position.

Thank you!

Cheers,
lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[Glenn Waldron]

Lucie,

FYI, the osgEarth project contains a SpatialReference class that provides
general coordinate conversion functionality. (It uses GDAL/OGR under the
hood.) You might take a look at this for ideas. http://osgearth.org

Glenn Waldron : Pelican Mapping


On Fri, Oct 1, 2010 at 9:50 AM, Tueller, Shayne R Civ USAF AFMC 519
SMXS/MXDEC shayne.tuel...@hill.af.mil wrote:

 Lucie,

 If you're on a flat earth, you shouldn't be using the
 convertLatLongHeightToXYZ method. This is only used for mapping spheroid
 coordinates to geocentric (origin is at the center of the spheroid)
 coordinates. Because you were referencing this method, it was assumed that
 you were using this type of mapping.

 If you want to get X,Y from a Lat,Long pair, you need to use some other
 projection or mapping. You could use a Plate Carree projection or something
 similar http://en.wikipedia.org/wiki/Equirectangular_projection. May I
 also
 suggest that you use something like GeoTrans or GDAL to assist you in what
 you need to do.

 -Shayne

 -Original Message-
 From: osg-users-boun...@lists.openscenegraph.org
 [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of lucie
 lemonnier
 Sent: Friday, October 01, 2010 3:06 AM
 To: osg-users@lists.openscenegraph.org
 Subject: Re: [osg-users] convertLatLongHeightToXYZ

 Hi,

 In fact, my model is not spheroid, it is a flat terrain.
 That's why I need simply the position.

 Thank you!

 Cheers,
 lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[lucie lemonnier]

Hi,

Thank you for your replies!
This helps me a lot!

Cheers,
lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[lucie lemonnier]

Hi,
The function 
ellipsoid-computeLocalToWorldTransformFromLatLongHeight(osg::DegreesToRadians(lat),osg::DegreesToRadians(lon),
 altitude, position);
give me the same values of X,Y,Z as if I use directly the function 
ellipsoid-convertLatLongHeightToXYZ(osg::DegreesToRadians(lat),osg::DegreesToRadians(lon),
 altitude, position);
I don't understand.
Can you clear up me?

Thank you!

Cheers,
lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC]

Yes, they're both equivalent in that they return position info but the
former returns a matrix for you to use in your transform node so that your
model will be positioned correctly on the spheroid. I believe the up
vector of the model will then match the up vector at that position on the
spheroid so that things are oriented correctly (i.e. a car appears upright
sitting on the ground).

-Shayne

-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of lucie
lemonnier
Sent: Thursday, September 30, 2010 10:09 AM
To: osg-users@lists.openscenegraph.org
Subject: Re: [osg-users] convertLatLongHeightToXYZ

Hi,
The function
ellipsoid-computeLocalToWorldTransformFromLatLongHeight(osg::DegreesToRadia
ns(lat),osg::DegreesToRadians(lon), altitude, position);
give me the same values of X,Y,Z as if I use directly the function 
ellipsoid-convertLatLongHeightToXYZ(osg::DegreesToRadians(lat),osg::Degrees
ToRadians(lon), altitude, position);
I don't understand.
Can you clear up me?

Thank you!

Cheers,
lucie

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[osg-users] convertLatLongHeightToXYZ

[lucie lemonnier]

Hi,
Can you explain me a little the function 
osg::EllipsoidModel::convertXYZToLatLongHeight?
I don't understand why x and y are calculated based on height.
If I changed the height of a model and I don't change the latitude and 
longitude, x and y change. Why?

Thank you!

Cheers,
lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[Robert Osfield]

HI Lucie,

The XYZ are in Earth Center Earth Fixed coordinates, not local
coordinates to surface of the earth.

Robert.

On Wed, Sep 29, 2010 at 9:52 AM, lucie lemonnier
lucielemonn...@hotmail.fr wrote:
 Hi,
 Can you explain me a little the function 
 osg::EllipsoidModel::convertXYZToLatLongHeight?
 I don't understand why x and y are calculated based on height.
 If I changed the height of a model and I don't change the latitude and 
 longitude, x and y change. Why?

 Thank you!

 Cheers,
 lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[lucie lemonnier]

Hi,

I understood that the XYZ are in Earth Center Earth Fixed coordinates.
So is it normal that X,Y are calculated based on height?
In fact, I put a latitude, longitude and height on a model, I use 
osg::EllipsoidModel::convertLatLongHeightToXYZ to obtain the position x,y,z and 
I transform my point with the MatrixTransforms applied on the terrain model and 
I place my model with the transformed point.
Is it the step to be followed? 

Thank you!

Cheers,
lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[Robert Osfield]

Hi Lucie,

On Wed, Sep 29, 2010 at 10:43 AM, lucie lemonnier
lucielemonn...@hotmail.fr wrote:
 I understood that the XYZ are in Earth Center Earth Fixed coordinates.
 So is it normal that X,Y are calculated based on height?

I'm a bit confused by your question, in ECEF the coordinate is always
XYZ, one doesn't ever just consider XY, this would just be a
projection of the each onto a flat cross section through the side of
the each, not sure what use this would be.

 In fact, I put a latitude, longitude and height on a model, I use 
 osg::EllipsoidModel::convertLatLongHeightToXYZ to obtain the position x,y,z 
 and I transform my point with the MatrixTransforms applied on the terrain 
 model and I place my model with the transformed point.
 Is it the step to be followed?

One normally uses a transform node to enable one to place local
coordinates into the ECEF coordinate frame without lose of precision
when computing intersections and doing rendering.  The osgTerrain
NodeKit uses transforms to avoid numerical issues, so have a look at
src/osgTerrain/GeometryTechnique.cpp  it see how it computes it's
transform and local coordinates.

Robert.
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Re: [osg-users] convertLatLongHeightToXYZ

[lucie lemonnier]

Hi,

Thank you for your reply. 
I will look at this.

Cheers,
lucie

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Re: [osg-users] convertLatLongHeightToXYZ

[Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC]

Lucie,

This is how you would place your model...

osg::Matrixd position;
ellipsoid-computeLocalToWorldTransformFromLatLongHeight(osg::DegreesToRadia
ns(lat),
osg::DegreesToRadians(lon), altitude, position);
transform-setMatrix(position);

where transform is an osg::MatrixTransform node that has your model as a
child node.

The X,Y,Z geocentric Cartesian coordinates from the lat,lon,alt can be
extracted by:

osg::Vec3d pos = position.getTrans();

Keep in mind that an altitude of zero will yield a point on the surface of
the spheroid for a given lat,lon pair. Any altitude  zero is the height
above the ellipsoid/spheroid.

Hope this helps...

-Shayne



-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of lucie
lemonnier
Sent: Wednesday, September 29, 2010 3:44 AM
To: osg-users@lists.openscenegraph.org
Subject: Re: [osg-users] convertLatLongHeightToXYZ

Hi,

I understood that the XYZ are in Earth Center Earth Fixed coordinates.
So is it normal that X,Y are calculated based on height?
In fact, I put a latitude, longitude and height on a model, I use
osg::EllipsoidModel::convertLatLongHeightToXYZ to obtain the position x,y,z
and I transform my point with the MatrixTransforms applied on the terrain
model and I place my model with the transformed point.
Is it the step to be followed? 

Thank you!

Cheers,
lucie

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