This historical aerial photography mosaic was used to develop a reconstruction of the historical landscape and prevailing conditions of Napa Valley. The early aerial photography from 1940 and 1942 was one of several data sources used to determine conditions prior to Euro-American modification. A small portion of one image from 1953 was used near St. Helena. The mosaic consists of early black and white aerial photography. 82 photographic prints covering the project area were obtained from the Napa County Resource Conservation District/Natural Resources Conservation Service.
Given the challenges of historical data, accuracy varies in different parts of the image, and in some places horizontal displacement may be as high as 80 meters. For this reason, we recommend that the imagery be used at a coarse scale. Caution should be used when comparing this imagery to more spatially accurate contemporay sources.
Data may be subject to change without prior notification. If this data is modified, changes should be documented in a metadata record that should accompany all redistributed data. If data is transmitted or provided in any form to another user, the data must be accompanied by a copy of this disclaimer and all documentation provided with the original data set, including the full metadata record. SFEI-ASC requests that the use of these data in any map, publication, or report should cite this study or the direct data source(s) used and give proper attribution and credit to the originators of the data.
For more detail refer to the Napa Valley Historical Ecology Atlas.