As stated previously, CCSF sits between two major faults and it is expected that future re-surveys of the HPN will be conducted to determine secular and episodic movements within the area. If future surveys of the HPN follow the specifications and procedures adopted for this survey, the relative accuracy of measured shifts is expected to approach 5-6 millimeters at the 95% level of confidence. Statistically, this means the probability at the 95% level of confidence is that movement (signal) has occurred if the movement between two epochs is greater than the relative 95% error (noise). The differences in successive coordinates could be used to estimate movements but do not provide statistical information about the relative accuracies of movements. Measurements of temporal movements should be based on a rigorous simultaneous least squares adjustment of multiple redundant observations at two different epochs for each point to compute the movement and relative accuracy. The success of this process is predicated on the absolute recovery of the reference frame in this survey which is the IGS08(2005) 2013.54 Epoch based on the National Spatial Reference System (NSRS) CORS. APPENDIX GLOSSARY CCSF City and County of San Francisco CCSF-CS City and County of San Francisco Coordinate System CGPS Continuously GPS Stations in California CORS Continuously Operated Reference Stations in the National Spatial Reference System FGCC Federal Geodetic Control Committee FGDC Federal Geographic Data Committee GIS Geographic Information System GLONASS Globalnaya Navigatsionnaya Sputnikovaya Sistema (Russian GPS system) GNSS Global Navigation Satellite System (GPS and GLONASS used in this survey) GPS Global Positioning System
As stated previously, CCSF sits between two major faults and it is expected that future re-surveys of the HPN will be conducted to determine secular and episodic movements within the area. If future surveys of the HPN follow the specifications and procedures adopted for this survey, the relative accuracy of measured shifts is expected to approach 5-6 millimeters at the 95% level of confidence. Statistically, this means the probability at the 95% level of confidence is that movement (signal) has occurred if the movement between two epochs is greater than the relative 95% error (noise). The differences in successive coordinates could be used to estimate movements but do not provide statistical information about the relative accuracies of movements. Measurements of temporal movements should be based on a rigorous simultaneous least squares adjustment of multiple redundant observations at two different epochs for each point to compute the movement and relative accuracy. The success of this process is predicated on the absolute recovery of the reference frame in this survey which is the IGS08(2005) 2013.54 Epoch based on the National Spatial Reference System (NSRS) CORS. APPENDIX GLOSSARY CCSF City and County of San Francisco CCSF-CS City and County of San Francisco Coordinate System CGPS Continuously GPS Stations in California CORS Continuously Operated Reference Stations in the National Spatial Reference System FGCC Federal Geodetic Control Committee FGDC Federal Geographic Data Committee GIS Geographic Information System GLONASS Globalnaya Navigatsionnaya Sputnikovaya Sistema (Russian GPS system) GNSS Global Navigation Satellite System (GPS and GLONASS used in this survey) GPS Global Positioning System
HPN%20Final%20Survey%20Report%20031114.docx