I noticed that the Copernicus DEM (Digital Elevation Model) for both GLO-30 and GLO-90 is available to download freely at opentopography.org. This peaked my interest to see how Timișoara (altough, having a flat terrain) looks like, and to see if it would be possible to do 3D print of it’s Digital Elevation Model.

Not only Copernicus DEM is covered on opentopography.org for our AOI:

Since the recent post, where I only included True Color Imagery using Sentinel-2 data, providing an overview of some major cities, I thought it might also be interesting to extend those examples so we can have a look at the vegetation around (and also inside) of the cities.

We can use a simple Normalized Difference Vegetation Index (NDVI) that is computed like so:

$$ NDVI = \frac{NIR - RED}{NIR + RED} $$

We propose to showcase the capabilities of the recently created data catalog at the Computer Science department, West University of Timișoara. The catalog exposes Sentinel-2 imagery (currently) using STAC Catalogs.

We store Sentinel-2 L1C products from 2017-01-01 till present, covering the whole territory of Romania. This post will illustrate the usage of stackstac in order to turn a STAC Collection into an xarray dataframe that is later processed using dask showing a timelapse of some big cities in Romania throughout the years. The work presented is based on the stackstac example.