Are there datums
and coordinate systems
that address the issue of shifting coordinates through time? If so, what are some of the strategies and methods that the datums
and coordinate systems
use to address the issue?
To provide some context:
Several Earth processes, plate tectonics and isostatic rebound, affect where a (x, y, z)
location is (or perhaps better, is calculated to be) in a time step t1
in comparison to a different time step t2
. In some areas of the world, such as California, USA, this movement can be in the magnitude of centimeters per year. For some GIS analysis the shift in (x, y, z)
locations could have a serious effect on the results, for example examining sediment flux that rely on comparing raster cells and/or coordinates across different time steps often spanning several years or decades.