CORS comparision

[mthsdiniz-usp]

Hey all,

i'm starting to develop a work to calculate building subsidence and wanted to start the work by correlating the data generated by dolphin with the ones we can get on CORS Stations.

Assuming i get a campus / locations with "co-located", would it be feasible to pick one of the CORS as a reference point and compare the Dolphin LOS displacements results with the absolute motion from the other CORS?

A few questions around that:

What is the role the "reference date" plays on making it feasible?

Is there any other potential settings that need to be setup in order to get a similar signal between the two?

Thanks!

[scottstanie]

Hi,
That sounds like an interesting use case

What is the input data? Sentinel-1? Or something higher resolution?

And yes I think you should be able to do some kind of double difference between stations to get the relative InSAR movement.

The "reference date" in the configuration is more for manually setting a time of year/specific date that you think is the "best reference".
If you're trying to just look at PS pixels, it shouldn't make a big difference (or, could be changed post-processing).

I'm not sure what other changes might be needed without seeing the input data/type of land cover for the area of interest.
I would only add that if you want full resolution outputs (so the strides are (1, 1)), you may want to set the block_shape in worker settings to (256, 256); my default of (512, 512) assume that some amount of output striding is used.