You can certainly measure this with current surveying techniques.
Not easily. And compared to what? The classic USGS survey markers don't have their height measured accurately enough, and they move with the land. The USGS does have precision "vertical control point" markers, and there are about ten of them along the northeastern coast of San Francisco. The highest precision vertical control point nearby is a GPS station on top of Building 1 at Fort Mason, and its height is valid only to 1.35cm accuracy at 95% confidence.[2] Absolute elevation is tough to measure at those scales.
Relative elevation, relative to the average of all ground points for, say, a kilometer radius, is something a radar satellite can do well.
Not easily. And compared to what? The classic USGS survey markers don't have their height measured accurately enough, and they move with the land. The USGS does have precision "vertical control point" markers, and there are about ten of them along the northeastern coast of San Francisco. The highest precision vertical control point nearby is a GPS station on top of Building 1 at Fort Mason, and its height is valid only to 1.35cm accuracy at 95% confidence.[2] Absolute elevation is tough to measure at those scales.
Relative elevation, relative to the average of all ground points for, say, a kilometer radius, is something a radar satellite can do well.
[1] https://www.ngs.noaa.gov/NGSDataExplorer/ [2] http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=AF8575