Calculating map scale

DerekVince — Sun, 12 Dec 2021 16:56:35 GMT

Hi all

I have a geometry (an Envelope) defined by 2 lat/lon points. I'm having trouble wrapping my head around the concept of the camera scale (in 2D) needed to exactly encapsulate that envelope. I know that if I zoom the current view to the envelope then I will get the scale I'm looking for. However, this also changes the actual view in the scene. I'm looking to determine the Scale in a way that does not affect the users view.

MapView view= MapView.Active;
await QueuedTask.Run(() =>
{
   // This works, but changes the user's view. Not good!
   view.ZoomTo(envelope);
   Debug.WriteLine("Scale: " + view.Camera.Scale);
});

Is there a way to manually calculate that scale value, or, to determine it somehow without affecting the view for the user?

Thanks

Re: Calculating map scale

Amadeus111 — Thu, 11 Feb 2021 22:35:34 GMT

It is an old post but maybe it would help someone. You might need to insert the last line in another QueuedTask

await QueuedTask.Run(() => { //1st get the current envelope, so you can go back to it later after calc Envelope currentExtent = MapView.Active.Extent; currentExtGeometry = currentExtent.Clone(); // Get your scale for the envelope view.ZoomTo(envelope); Debug.WriteLine("Scale: " + view.Camera.Scale); //Goback to previous extent MapView.Active.ZoomTo(currentExtGeometry); });

topic Calculating map scale in ArcGIS Pro SDK Questions

Calculating map scale

Re: Calculating map scale