🚀 It's launch day for @esaearth.esa.int's HydroGNSS satellite along with #IrideSpazio and #Iceye satellites.

Tune in today, 26 November, from 18:01 GMT/19:01 CET, to watch the liftoff live on #ESAwebTV.

📺 watch.esa.int

@ukspaceagency.bsky.social

Tropospheric delays in ground‐based GNSS multipath reflectometry—Experimental evidence from coastal sites We find clear evidence of tropospheric delay in data from 22 sites around the world This delay is elevation and height dependent and results in tidal constituents that are around 2% (2 cm/m) too sm...

✏️ Note: The sea-level values shown are relative (not referenced to a datum).

For more detailed info related with tropospheric effects in GNSS-IR, I recommend the following paper by Simon Williams and Felipe Nievinski:

📖 doi.org/10.1002/2016...

For those interested in GNSS-IR: the tropospheric height bias can significantly affect sea-level estimates. Here’s an example from the AC12 station in Alaska (~68 m above sea level). The difference between results with (blue) and without (orange) tropospheric correction is clear.

#GNSSIR #SeaLevel

IOC data for Hawaii showing waves arriving at Hawaii over a period of hours, live at 30th July 06:53 UTC.

Tsunamis in Hawaii. Heights in metres. Notice how the first wave wasn't the biggest. Real time data at www.ioc-sealevelmonitoring.org/station.php?...

Cemali Altuntas - Researcher & Geomatics Engineer

I’m happy to announce my new academic portfolio website!

You can find details about my academic background, a list of my publications, projects, and software, as well as my contact information. I also plan to release open-source, web-based GNSS-IR tools soon.

cemalialtuntas.github.io