Cesium Chinese Website: http://cesiumcn.org/ | China Fast Access: http://cesium.coinidea.com/

Many Cesium users frequently need to visualize hundreds of thousands of 3D buildings across entire cities for real estate, urban planning, or civil engineering projects. To make it easier to create useful digital twins for these industries, we just added support for embedding feature data when uploading KML/COLLADA to Cesium ion.

This means you can now export your 3D buildings from modeling tools (such as CityEngine, Rhino, and 3DCityDB) and include per-building attributes when sharing data on the Cesium ion web.

Philadelphia 3D buildings combined with Cesium World Terrain. Each building can be clicked to display its name, address, and parcel number.

Cesium ion converts your buildings into 3D Tiles to optimize them for the web, while still allowing you to inspect each individual building. The source 3D data for the above example comes from Pennsylvania Spatial Data Access, with addresses, names, parcel numbers, and city-owned attributes from Open Data Philly.

To dive deeper into this visualization, we can use 3D Tiles Styling to highlight all properties owned by the City of Philadelphia and click on them to get their parcel numbers. The parcel number can then be used to look up more information about each building from the city database.

You can use 3D Tiles Styling to highlight all city-owned buildings in Philadelphia, such as museums and historic sites.

To create such a scene for a city, the source data should be one or more KML files that define the location of each 3D model. Here is a snippet from the KML file for Philadelphia buildings.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18

<Placemark>
  <name>Independence Hall</name>
  <Model>
    <Link><href>building.dae</href></Link>
    <!-- Model properties like longitude, latitude, etc... -->
  </Model>
  <ExtendedData>                       
    <Data name="Address">
      <value>500-36 CHESTNUT ST</value>
    </Data>
    <Data name="Parcel_ID">
      <value>313762</value>
    </Data>
    <Data name="Is_City_Owned">
      <value>True</value>
    </Data>
  </ExtendedData> 
</Placemark>

The Placemark name is used as the building name. Any additional data can be added to the tag.

Once you upload your buildings to Cesium ion, you can style and inspect them with Cesium Stories. You can also combine them with other types of content such as CityGML or point clouds, which can also have embedded feature data.

Try creating a Cesium ion account and uploading your 3D buildings.

Author: Omar Shehata

Original link: https://cesium.com/blog/2020/04/09/kml-collada-metadata/

Comment: Cesium is relentlessly promoting Cesium ion and Cesium Stories. You might want to check them out, though personally I’m not a big advocate of online solutions since most people prefer offline setups. Data security is also increasingly important.

Cesium Chinese Website QQ Group: 807482793

Cesium Chinese Website: http://cesiumcn.org/ | China Fast Access: http://cesium.coinidea.com/