An international team of astronomers has produced the largest and sharpest map of the sky at ultra-low radio frequencies, using the Low Frequency Array (LOFAR) radio telescope. The map published in the journal Astronomy & Astrophysics reveals more than 25,000 active supermassive black holes in distant galaxies.
Daily Image
New aerial picture of superterp
© CC-BY-4.0 Nationaal Georegister
The maps are published as part of PDOK ("Publieke data op de kaart") and are available in various forms - such as WMS - under a CC-BY 4.0 license. They can be viewed online for the whole of The Netherlands at PDOK viewer: choose 'Selecteer een dataset', add 'Overige kaarten / Luchtfoto's / Luchtfoto (25cm) 2020'. The 2020 map is not available there yet, I used QGIS with the PDOK plugin to get direct access to the underlying WMTS server.
Apart from being nice desktop backgrounds, these photos could help in validating antenna positions and assessing the state of some antennas. The orthophotos are of high quality and the positions should be accurate to a few cm.