Maps and mappers of the 2021 calendar: Valters Zeizis, cover

Q: Tell us about yourself.

A: I work as an Oceanologist for the Latvian met-office and work with meteorological and marine data. I have experience working with various spatial data, but I guess my favorite source is Satellite data. I tend to experiment with various sensors and processing methods and often share my results on social media. I think in a nutshell it’s also how I became engaged with the makers of GeoHipster calendar.

Q: Tell us the story behind your map (what inspired you to make it, what did you learn while making it, or any other aspects of the map or its creation you would like people to know).

A: The image that is on the cover of this year’s calendar shows suspended sediment in the Gulf of Riga. The image shows suspended sediment that is poured into the sea during springtime river runoff. Relatively stable marine currents form beautiful patterns, while the coloring is related to optical properties of water – the density and size of the suspended matter. The inspiration behind the image is purely aesthetic, but in a sense it’s also analytical. It is also a rare occasion of a cloudless Satellite overpass during a very interesting and large scale natural event.

Q: Tell us about the tools, data, etc., you used to make the map.

A: The image is made using Sentinel 2 data that has been processed by a script which enhances NDWI (normalized difference water index). The image came about while I was playing with the script (https://custom-scripts.sentinel-hub.com/custom-scripts/sentinel-2/selective_enhancement_based_on_indices/) and looking at the phenomena in a familiar area. After I was satisfied with the capture I also did some post-processing in GIMP.

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