The Los Angeles County, California, Department of Regional Planning (DRP) developed the Green Zones Program in 2015, to attain equitable development for the next 20 years, and to help update the Los Angeles County General Plan. Centering on environmental justice and community engagement, the program aimed to ensure that residents of all income levels can enjoy the development of the County under the changing climate and severe heat. The Green Zones Program Framework contained four elements: land use policy, community engagement, environmental justice screening map, and prevention and mitigation. "Groundtruthing" was the main procedural tool utilized by the program to collect and study the potential environmental hazards information in the communities. It emphasized the importance of collaboration with community members and community-based organizations. Groundtruthing was not a one-time event, but a continuing effort between the government and the local communities.