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No, you don't need separate vector files for each zoom level. Of course they could speed things a little bit up but will also require much more storage space than using a single database for a specific area. However do note that PBF files are not suited for on-demand rendering. They are designed for efficiently storing OSM data, not for running queries on ...


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Here is how you could get the slope, using R and the raster package. To (also) get the intercept see help(calc) library(raster) # your file # b <- brick("file.nc") # example data: b <- brick(system.file("external/rlogo.grd", package="raster")) # here time is 1 to n, but you can set it something else time <- 1:nlayers(b) # write a function that ...


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You can generate new cross sections using Hec-Ras, you draw a line like a center of your river then you need to use the coordinates of your cross sections (I used Covadis software to get them). this video expalin the process https://www.youtube.com/watch?v=VlsTNNIi6Kc



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