setting elevation incorrect outside of west coast north america

[kfarr]

setting elevation of 3dtiles from google maps lat/long was incorrect – using a ‘constant’ to convert between is faulty for the following cases

• longitudes other than US / western hemisphere. More research on how to convert between elevation and google 3d tiles height (aka cesium 3dtiles standard)
• setting proper height of 3dtiles also doesn't work as expected for northwestern hemisphere high elevation areas such as 48.4069835, -114.3008482 example scene https://3dstreet.app/#/scenes/d26ddfeb-7e46-4c63-bd22-bd58d100b049.json