Hi All, is there any way to access metadata of a specific portion of the Google’s Photorealistic 3D tileset?
I have an app that allows users to set waypoints on the tileset and it’d be nice for my users to know when a specific portion of the map was last updated (as there are some parts of the map that are not updated and if some new buildings pop from construction then it might not show on the tileset).
If there’s no way to access this metadata, then any idea on how often these tilesets get updated?
I’m not aware of specific metadata that is associated with Google Photorealistic 3D Tiles. And I do not know anything about technical details of Google Photorealistic 3D Tiles that is not publicly available.
(Quite the contrary - I’m not deeply involved in that, neither on an organizational, nor on a technical level. The nice thing here is: You can just say “Go on, CesiumJS, load that!”, and there you got it. It’s fortunately not necessary to know many technical details to just use them )
But I’m certainly not the only one who ever looked at the network logs, saw file names like UlRPVEYubm9kZWRhdGEucGxhbmV0b2lkPWVhcnRoLG5vZGVfZGF0YV9lcG9jaD05OTcscGF0aD0zMTYsY2FjaGVfdmVyc2lvbj02LGltYWdlcnlfZXBvY2g9MTAyMCxhbGlnbm1lbnRfdmVyc2lvbj1ST0NLVFJFRV85OTdfR09PR0xFX0RBVFVNXzIwMjUwMjA2VDE0NTNaX2dlbmVyYXRlZF9hdF8yMDI1MDQxOFQxMjA4Wg , dumped that into some Base64 decoder, received RTOTF.nodedata.planetoid=earth,node_data_epoch=997,path=316,cache_version=6,imagery_epoch=1020,alignment_version=ROCKTREE_997_GOOGLE_DATUM_20250206T1453Z_generated_at_20250418T1208Z as the result, and thought "Aha! ".
Now … this is not official, and likely not publicly specified. It’s just an opaque file name. Google could change this, at any point in time, without prior notice. Not sure what others might want to do with this information…
@bertt Was this supposed to go into a different thread? Just checking, because it does not seem to be releated to “Google Photorealistic 3D Tiles” (or I overlooked something)
Currently ,the filename changed to like this "AJVsH2xfLHC_4g2_bLcasTb182l5i_LlBGXs-yNC2Z54PDPQG1OA8SFa1wnS7im8DllU83AM0xdYV3yHtsNeEef5_ImDGawb_TeL6eKLPZ_qgJiZMXvvWgHXqWDyTMcDcg", I cannot decode the fiename by base64 and base64URL, Who know the format of this string? Thanks a lot!
@Shiner_Chen In the meantime, I also saw that they changed the file name pattern into something that apparently no longer is a base64 string. This underlines what I said above:
Unfortunately, I haven’t found a way to derive information from these new file names. It might be a “trivial” encoding of the same information, maybe just something ZIPped or ROT13’d or so. But I didn’t spend too much time investigating it, given that Google apparently does not want people to rely on that.
)
, dumped that into some Base64 decoder, received 
".