Who exactly needs elevation data? What is the use case? Why are people using this? I think

another reason geospatial is so cool is that it cuts across all these different industries and use cases.

And so we have a crazy varied customer base.

Our biggest area is in natural hazard modeling, so like flooding and wildfires, where the elevation of the terrain is really important because water flows downhill and fire more or less flows uphill.

And the terrain is a really big dictator of that.

But there's also, we do a lot of work with aviation for navigation, avoiding the terrain.

There's some legal things around different flight ceilings specified off terrain as a datum.

Where is your data coming from? If I may ask, how often does it change? I guess we have the occasional earthquake or something, but isn't the elevation constant? Take us through the process of how this data gets created and how it gets updated.