Please complete this exercise by the end of day on Thursday, 23 November, 2023 (the day before next week’s work session).
To start this assignment, accept the GitHub classroom
assignment, and clone your own
repository, e.g., in a CSC
instance. Make sure you commit and push all changes you make (you can
revisit instructions on how to use
git and the JupyterLab git-plugin
on the website of the Geo-Python
To preview the exercise without logging in, you can find the open course copy of the course’s GitHub repository at github.com/Automating-GIS-processes-2022/Exercise-3. Don’t attempt to commit changes to that repository, but rather work with your personal GitHub classroom copy (see above).
Coordinate reference systems#
Remember the difference between defining a CRS, and re-projecting a layer into
a new CRS! Before re-projecting, the layer should have a valid CRS definition
which you can check like this:
To define a projection, assign a new CRS to a geo-data frame’s
data.crs = pyproj.CRS("EPSG:4326")
This will update the metadata, only. The actual coordinate values will remained unmodified. Use this only if the original CRS definition is missing or invalid.
To re-project a
geopandas.GeoDataFrame, use its
data = data.to_crs("EPSG:4326")
This will actually transform the geometry features of the data frame, AND re-define the CRS definition stored in the