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Doesn't PDOK provide 8 cm resolution photos of The Netherlands?

lucgommans 4y ago
Recently at an OSM meetup with the local government in Aachen (Germany), they mentioned that some imagery they shot was deemed too invasive and only used internally. I thought that was 10cm, but now checking what is available, looks like I was wrong! Probably it was 5-7cm then? Or maybe this was rather about the imagery available from different angles, so you can see into gardens from different directions? In iD I see that indeed the PDOK imagery is now labeled 7.5cm, but checking that against the Belgian and German 10cm: PDOK 7.5cm: https://snipboard.io/fbWqYM.jpg https://snipboard.io/fbWqYM.jpg AIV Flanders 10cm: https://snipboard.io/Ahn4lJ.jpg https://snipboard.io/Ahn4lJ.jpg NRW (Germany) 10cm: https://snipboard.io/RpT3vA.jpg https://snipboard.io/RpT3vA.jpg PDOK's looks awful, much worse than 10. Maybe some regions are available in a higher resolution?
- isoprophlex 4y ago
  That is indeed awful, you're right. I remember that satellietdataportaal.nl or something like that allowed access to uncompressed files, maybe they're better. I'll see if I can find my old credentials and compare. But yeah, compared to those 10 cm images, that can't be effective 7.5 cm/px. Related: Apple Maps uses some data source that is ridiculously high res for my street. They've updated the image now sadly, but for a while I saw a gangly brown haired silhouette chasing two blonde haired kids across the street. I was super sure that was me and my kids; slanted shadows gave the right relative sizes, too. Cool and creepy at the same time.
  - iggldiggl 4y ago
    For the Dutch railway network, ProRail has commissioned a set of aerial images shot from a helicopter at a height of roughly 190 m, which is ridiculously high-res and available for viewing here: https://twiav.nl/nl/luchtfoto_prorail.php https://twiav.nl/nl/luchtfoto_prorail.php You can clearly make out individual paving stones or even the catenary wire, so the resolution must be somewhere in the 1 or 2 cm range.

Recently at an OSM meetup with the local government in Aachen (Germany), they mentioned that some imagery they shot was deemed too invasive and only used internally. I thought that was 10cm, but now checking what is available, looks like I was wrong! Probably it was 5-7cm then? Or maybe this was rather about the imagery available from different angles, so you can see into gardens from different directions? In iD I see that indeed the PDOK imagery is now labeled 7.5cm, but checking that against the Belgian and German 10cm: PDOK 7.5cm: https://snipboard.io/fbWqYM.jpg https://snipboard.io/fbWqYM.jpg AIV Flanders 10cm: https://snipboard.io/Ahn4lJ.jpg https://snipboard.io/Ahn4lJ.jpg NRW (Germany) 10cm: https://snipboard.io/RpT3vA.jpg https://snipboard.io/RpT3vA.jpg PDOK's looks awful, much worse than 10. Maybe some regions are available in a higher resolution?

isoprophlex 4y ago
That is indeed awful, you're right. I remember that satellietdataportaal.nl or something like that allowed access to uncompressed files, maybe they're better. I'll see if I can find my old credentials and compare. But yeah, compared to those 10 cm images, that can't be effective 7.5 cm/px. Related: Apple Maps uses some data source that is ridiculously high res for my street. They've updated the image now sadly, but for a while I saw a gangly brown haired silhouette chasing two blonde haired kids across the street. I was super sure that was me and my kids; slanted shadows gave the right relative sizes, too. Cool and creepy at the same time.
- iggldiggl 4y ago
  For the Dutch railway network, ProRail has commissioned a set of aerial images shot from a helicopter at a height of roughly 190 m, which is ridiculously high-res and available for viewing here: https://twiav.nl/nl/luchtfoto_prorail.php https://twiav.nl/nl/luchtfoto_prorail.php You can clearly make out individual paving stones or even the catenary wire, so the resolution must be somewhere in the 1 or 2 cm range.