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That used to be the case, but these days it is mostly satellite data. The newer civilian satellites (a lot of them are dual-purpose military/civilian) are capa
by jofer 13y ago
That used to be the case, but these days it is mostly satellite data.
The newer civilian satellites (a lot of them are dual-purpose military/civilian) are capable of resolutions below 1m. ~2m resolution satellite imagery has been available for over a decade now (e.g. the IKONOS and recent SPOT satellites).
I think (?) most of Google's imagery currently comes from the GeoEye-1 satellite, which they partially funded.
- jofer 13y agoJust to make to make what I'm saying more clear: I'm certainly not disagreeing that the highest zoom levels in major cities are aerial photographs. The city-block level imagery available globally is from satellite, though. For example, compare this (probably satellite, little building lean and ~1m resolution): http://goo.gl/maps/mJadH http://goo.gl/maps/mJadH To this (definitely aerial, lots of "lean" and ~10-20cm resolution): http://goo.gl/maps/WYnvE http://goo.gl/maps/WYnvE