About a year ago we performed a poc on Cesium-ion-SDK-1.75 .
After examining this version, it turned out that we were missing some features in the field of measurements, viewshed and analysis.
After a conversation with Roberto we got a dedicated (special) version, with these features
This version was to our satisfaction and it was agreed that these features would go into the next version of Cesium-ion SDK.
Now, we want to upgrade to the Cesium-ion-SDK-1.89 version
and it turned out that these features are missing or partially realized in the version.
Bottom line is that the features do not work.
I would love for your reference,