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GLTF

GIS File Name

CAMB3D_[Tile Name (ex: E_2)]_GLTF_Buildings.gltf.zip

Updated

Format

glTF and BIN file

Description

The City of Cambridge Geographic Information System (GIS) City-Wide 3D project provides a detailed three-dimensional model of buildings and bridges has been compiled from many sources over several years. The open-source building model collection provides 3D models that are compatible with open-source tools for modeling, model transformation, and web visualization. The model collection is segmented into tiles which is contiguous with the City of Boston 3D tile grid. Each model being assigned to the tile that its centroid falls within. Each three-dimensional building and bridge model is formatted in glTF format.

glTF (Graphic Language Transmission Files) are essentially a JSON file that is often used by Virtual Reality developers. This file is paired with a .bin file that contains vertex data and information can also be contained directly in the JSON

Purpose

The City of Cambridge GIS maintains a 3D model of the city as a visualization and analytical tool for understanding ideas related to the future of the City. The Cambridge 3D model are of buildings and bridges. Each of these components is shared in formats intended to facilitate collaboration between diverse communities who have an interest in understanding places in the city as they have changed or as they may be changed.

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Sources

The Cambridge 3D buildings and bridge layer was initially built using aerial photography from Spring 2010. Photogrammetric updates were added based on imagery from 2014, 2018, 2020, and 2021. Photogrammetric development of the 3D building models was conducted by CyberCity 3D.

Coordinate System

Projected Coordinate System: State Plane Massachusetts Mainland (Feet), North American Datum of 1983.

Vertical Coordinate System for 3D data: North American Vertical Datum, 1988 (NAVD 88) Feet (Height)

Usage Notes

glTF is a standard file format for 3D static models, animation, and moving scenes. Often used in games, AR & VR.