The time sequence map above shows how land use patterns have changed in the Antioch-Brentwood area of Contra Costa County, California between 1984 and 2002. Each color on the map corresponds to a different category of land use: P = prime farmland, S = farmland of statewide importance, U = unique farmland, L = farmland of local importance, G = grazing land, D = urban and build-up land, X = other land, W = water.
Changes in this area include conversions from irrigated farmland (green) and dryland or idle farmland (yellow) to urban (red) during this period. In addition, land is moving from higher-valued irrigated uses to pasture on Jersey Island in the northeast section of the animation. Information on these changes was gathered from air photos, local comments, and field reconnaissance.
Time sequence maps show how economic, environmental and/or cultural patterns have changed over time. They help us understand the geographic patterns of change in a very visual way. (see Land Use Map in the MapWatch Gallery).
The map was produced by the California Department of Conservation Division of Land Resource Protection.