Layer Estimates:

Layer: Index to Extract DEM tiles (ID:0)
Count: 70438
Extent:

XMin: 339999.99988447
YMin: -0.000133189861662686
XMax: 3060000.00016231
YMax: 1099999.99999364
Spatial Reference: 103122 (6543)
Vertical Spatial Reference: 105703 (6360)