This metadata document describes the collection and processing of topographic elevation point data derived from Interferometric Synthetic Aperture Radar (IfSAR) measurement for coastal Southern California. Collection consists of topographic elevations from the California counties of Santa Barbara, Ventura, Los Angeles, Orange, and San Diego, and the hydrologic units within those counties that drain to the Pacific Ocean along with offshore islands within the Channel Islands. The resulting data include (1) Digital Elevation Model (DEM), (2) Raw magnitude radar reflectance data, and (3) Height Variance data. This metadata record describes the height variance data.The height variance value represents the variance in the individual elevation values from multiple IfSAR flights that were used calculate the elevation for each cell in the DEM data set. ACCESS CONSTRAINTS: None, USE CONSTRAINTS: These data depict the heights at the time of the survey and are only accurate for that time. Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of it's limitations., DISTRIBUTION LIABILITY: Any conclusions drawn from analysis of this information are not the responsibility of NOAA, the Coastal Services Center or it's partners. 2004 2004 20080102 Elevation Elevation, Digital elevation model (DEM), Raw magnitude radar imagery (MAG), Height variance data, DSM, GeoSAR, RADAR, Mapping, Bathymetry/Topography, Interferometric Synthetic Aperture Radar (IfSAR), Interferometric Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce 33.631677 degrees_north -115.973179 degrees_east 20020101 20030101 Grid