Central Valley Historic Mapping Project

Using the Data

When querying the Central Valley Historic Mapping Project GIS it is important to understand the limitations of the digital coverages. The maps were created using a variety of independent sources with varying scale, accuracy, and completeness.

On the other hand, the information is extremely useful as a regional measurement of natural vegetation change. Using the associated GIS database, queries can be made to estimate regional change at four different stages over a 100-year time span.

A set of queries was run in order to gather acreage statistics on land use changes. Queries were as follows:

Valley wide totals for developed acreage versus non-developed acreage.

Regional totals for developed acreage versus non-developed acreage.

Final project document is available for download.

Using the Data | Valley Wide Totals | Regional Totals

HOME | Partnerships | Research | GIS Data and Maps | Using the Data