Data sets with OGC 3D Tiles

[vvoovv]

Use #497 for technical discussions.

Data set	Country	Data Provider	License	3D Format	View	Root URL
Helsinki	Finland	City of Helsinki		b3dm	link	link
Aarhus	Denmark			b3dm	link	link
Aurillac	France	CRAIG	Open	b3dm	link	link
Bourgoin-Jallieu	France	CRAIG	Open	b3dm	link	link
Clermont-Ferrand	France	CRAIG	Open	b3dm	link	link
Gex	France	CRAIG	Open	b3dm	link	link
Issoire	France	CRAIG	Open	b3dm	link	link
Le Puy-en-Velay	France	CRAIG	Open	b3dm	link	link
Montluçon	France	CRAIG	Open	b3dm	link	link
Moulins	France	CRAIG	Open	b3dm	link	link
Riom	France	CRAIG	Open	b3dm	link	link
Saint-Étienne	France	CRAIG	Open	b3dm	link	link
Saint-Étienne (2 quartiers)	France	CRAIG	Open	b3dm	link	link
Strasbourg	France	Eurométropole de Strasbourg		b3dm	link	link
San-Francisco Demo	USA	Aerometrex	Commercial	b3dm	link	link

[jo-chemla]

See from the official cesium 3d-tiles repo

• 3d-tiles sample-data for sample test data
• as well as data-providers for some demo datasets - usually behind paywalls, except for some open-data samples.

Other examples: cesium ion, aerometrex san-francisco, vexcel 3d-cities

[vvoovv]

@jo-chemla

Do you know any data sets available in the OGC 3D Tiles 1.1 format?

[jo-chemla]

The first link has sample datasets which or 1.1, but made for tests, these are not real data.

When you create a cesium ion free account, you do have access to some 3dtiles datasets - where cesium ion handles access/keys a bit differently than the same tilesets which would be hosted on a standard server, with SAS keys or JWTs. But most datasets seem to be 1.0 spec b3dm. Same for the aerometrex and vexcel tilesets, these are b3dm 1.0.

What you could do is use CesiumGS/3d-tiles-tools, with the upgrade command, like below. This would probably involve downloading the whole 1.0 tileset before conversion, and requires to follow thoroughly the licensing of that test tileset.

npx 3d-tiles-tools upgrade -i ./specs/data/TilesetOfTilesets/tileset.json -o ./output/upgraded --targetVersion 1.1

I do not have in mind public tilesets which do follow the 1.1 spec, will dig a bit!

@bertt did recommend some 1.1 tilesets Rotterdam pg2b3dm pdok.nl/kadaster implicit and explicit. These are not photorealistic ones but can still be useful for testing.

[vvoovv]

explicit

Unfortunately I am getting the error Extension EXT_meshopt_compression is not available on this addon version for the above dataset.

[jo-chemla]

Linked issue for EXT_meshopt_compression extension support within glTF-Blender-IO here

[tbenazzi]

Hello Guys,
We are actually diving into 1.1 format and we could definetely provide a dataset to analyse and test it

[vvoovv]

Hi @tbenazzi

You are very welcome to provide a link to the root tile of your dataset.

[vvoovv]

@tbenazzi

We are ready to test your dataset (see the latest messages at #497). Please provide a link to the root tile of the dataset.

[jo-chemla]

Here are a few other open-data 3dtiles tilesets:

• Auvergne Rhone Alpes tileset.json, see metadata & viewer
• Métropole Européenne de Lille tileset.json (metadata)
• AGI Headquarters tileset.json
• Still the Cesium Ion Asset Depot, require an account but ahs lots of 3dtiles samples
• Planet Labs has a collection of satellite stereo imagery 3dtiles, see the STAC catalog eg angkor-wat tileset.json

Other:

• Strasbourg Od@CiT city had an amazing collection of datasets available here (3dtiles tilesets and others) but seem unavailable at the moment
• Plateau for Japan data is an interesting resource, but could not find direct link to tilesets
• Metropolis of Lyon (metadata) multiple tilesets located in here

[vvoovv]

• Auvergne Rhone Alpes tileset.json, see metadata & viewer

There are actually 16 datasets there (each dataset below contains a link to the root tile):

• Aurillac
• Bourgoin
• Clermont
• Gex
• Issoire
• Le Puy en Velay
• Montlucon
• Moulins
• Riom
• Saint Etienne
• Saint Etienne (2 quartiers)
• Valence
• Vichy
• Vienne
• Voiron
• Exemple bati3d non texturé (domérat)

[vvoovv]

• Métropole Européenne de Lille tileset.json (metadata)

I can't open the link for the root tile.

[vvoovv]

• Plateau for Japan data is an interesting resource, but could not find direct link to tilesets

The link is not correct here.

[jo-chemla]

• The provided tileset.json for Métropole Européenne de Lille has a root/content/url that points to pyramid/tileset.json which refers to this tileset.json
• The link to strasbourg Od@CiT actually does work, and it's a very nice dataset, here an example tileset.json
• Plateau is hard to parse. Viewer is here, & here is the google translate url, tehse are z-mostly extruded polygons like OSM, and downloaded as zips rather than endpoints to tileset.json, eg Tokyo 2023

Just did a PR to Cesium 3Dtiles repo to include open-data datasets - not more than these listed above, but maybe someone will add more open-data tilesets to that list in the future!

[tbenazzi]

HI, @vvoovv sorry for the delay,

Please find attached the acces to one tile of our city tileset.
I hope it will help you to understand the architecture of 1.1 json.
Host it where you want. The link expires in 48hours.
Cheers

[jo-chemla]

PS If you want to quickly debug/visualize an existing 3dtiles dataset, just prepend this url to the tileset.json: https://viewer.geofox.ai?tileset=

For example here for Strasbourg

[vvoovv]

• Plateau is hard to parse. Viewer is here,

At least it contain 2 files with the name tileset.json:

1. tileset.json
2. tileset.json

[vvoovv]

Please find attached the acces to one tile of our city tileset.

@tbenazzi

Thank you!

What is the license of your data?

Implicit tiling is not currently supported by the Blosm addon. It may be implemented later.

[tbenazzi]

@vvoovv our data are licensed under Creative Commons Attribution-NonCommercial (CC BY-NC) 4.0.

Feel free to use it for non commercial purposes.

[jo-chemla]

Implicit tiling has been introduced with v1.1 of 3dtiles, the hierarchy uses quadtree or octree structures (with associated children bitmasks) rather than one bounding volumes per child. A good reference to understand the underlying principles and spec is this notebook by geodan.

[vvoovv]

@tbenazzi

Unfortunately Blender's glTF importer can not import your glTF files:
Extension KHR_texture_basisu is not available on this addon version

[jo-chemla]

Thread to track support of ktx2 support within the blender-gltf-io here, awaiting openimageio to support ktx in this thread

Note the ktx pipeline can directly export a ktx file to image file via the extract CLI method. See this js script based on gltf-transform and 3d-tiles-tools if you want to batch process all tiles of an entire tileset to apply the same processing, like decompressing ktx textures.

[vvoovv]

Thread to track support of ktx2 support within the blender-gltf-io here, awaiting openimageio to support ktx in this thread

Also this thread

[tbenazzi]

@tbenazzi

Unfortunately Blender's glTF importer can not import your glTF files: Extension KHR_texture_basisu is not available on this addon version

This Version have a JPG compression Instead of KTX

[vvoovv]

@tbenazzi

Sorry to disturb you. Unfortunately Github does not notify when a message was edited. So I was not aware that you provided a link to the a dataset with the JPEG compressions. The link seems to be expired. Could you please proved a download link again?

[tbenazzi]

@vvoovv a new link to JPG compression asset

[vvoovv]

@tbenazzi

Got the data. Thank you!