Comment by zetalemur - Hacker Neue

zetalemur Dec 17, 2022 parent

It's a nice start but what we also need would be an "OpenRasterMap" project - a project where we collect raster data (more and more data gets available) and store the entire planet (RGBN aerial imagery) in let's say 1m/Pixel.

It might be feasible to store entire planet's raster tiles in 10 years in a (beefy) desktop machine.

geo-matik Dec 18, 2022

Sentinel-2 provides worldwide coverage in 10m resolution and is open data. It would be challenging to reach worldwide 1m coverage, even for the big players.

You may also want to have a look at OpenTopography, following a similar principle but for elevation data.

zetalemur OP Dec 20, 2022

Yes, I am aware of Sentinel-2 10m data (RGBN), there are even commercial offerings. Actually the storage requirements are not that big for 10m, like ~4TB for the entire (non-water) world. Napkin math:

  - 15000 Sentinel-2 scenes over land
  - 10980^2 pixels per scene
  - 50% lossless compression per scene
  - 4 channels (RGB and infrared)

This results in 15000 * 10980^2 * 4 * 0.5 / 1024*4 ~ 3.3TB. This matches commercial offerings like in https://cloudless.eox.at/#data. Of course we have to add lower-scale imagery that is often used to provide XYZ tiling that would further increase the storage requirements.

Thanks for the link to OpenTopography, it's an interesting project and elevation data is extremely valuable.

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