Get ground point lat/lng from aerial lat/lng/alt/heading/angle?

CesiumJS
1

**What is the correct approach to get a ground point lat/lng from and aerial model (****lat/lng/altitude)**with a camera (heading/angle)?

Thanks in advance!

Best Regards,

Chris

2

Hi Chris,

Sorry, what do you mean? Do you mean, how to get the point at the center of the current camera view?

If so, what you need is something like the following:

var screenCenter = new Cesium.Cartesian2();

var canvas = viewer.canvas;

screenCenter.x = Math.floor(canvas.clientWidth / 2);

screenCenter.y = Math.floor(canvas.clientHeight / 2);

var position = viewer.scene.camera.pickEllipsoid(screenCenter);

``

Use viewer.scene.globe.pick() instead of viwer.scene.camera.pickEllipsoid if you want the pick to be sensitive to terrain height.

See here for examples in action: http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Picking.html&label=Showcases

Hope that helps!

  • Rachel
3

Hey Rachel,

Sorry for the lack of detail. I have an airplane model rendered in my map that has an onboard camera with a heading and an angle pointing down towards the globe. I want to get the lat/lng of the ground point that the center of the onboard camera is looking at given the airplane model lat/lng/alt and the properties of the direction that the camera is looking.

Does that make sense?

Best Regards,

Chris

4

Hi Chris,

Yes that makes sense! That’s what the code I’ve given you should do.

Best,

  • Rachel