Fig. 1
From: Transforming CCTV cameras into NO2 sensors at city scale for adaptive policymaking
Multi-level representation of all data sources. (A) The six layers of factors presented in this research. (B) The spatial representation as graph of knowledge of the camera (red nodes) and NO2 (blue nodes) inputs. The locations of the cameras and NO2 sensors do not need to align. The figure was created by the first author using Python programming language (using geopandas and matplotlib). (C) The multi-level representation of the studied data modalities shows several spatial and temporal resolutions in which different data modalities are aligned to conduct this research.
