Explore using GEDTM30

[cheginit]

A new set of topo products has been released that can be found here. They provide the data in COGs, so they're easy to subset. I think exploring their usage is worthwhile.

[barneydobson]

Yep and I think more generally exploring the impact of different DEMs/scales/and other datasets for synthetic networks is a whole fish. I was actually grilled on choice of using OSM the other day xD

[cheginit]

Right. For GEDTM30, I was referring to incorporating some of their other products like TWI and slope in the algorithm.

Regarding OSM, I agree, there are some other datasets that improve upon OSM like GRIP, but I am not aware of a convenient package like osmnx that provides access to those, maybe pyosmium?

[barneydobson]

This was my response too ;)

For slope - that is a parameter in the SWMM model catchments, but it is already calculated from the DEM? I guess this product has greater accuracy?

For TWI - this seems like it will be particularly relevant when incorporating the 2D flood modelling with synxflow - one of the key tasks in that will be sourcing the relevant data to set up their model so it seems like this could be very promising!

[cheginit]

For slope, that's what I was thinking too. It'd be interesting to quantify its impact on the mode performance.