An error whose algebraic sign and, to some extent, magnitude bears a fixed relation to systematic error – some condition or set of conditions. Systematic errors follow some fixed pattern and are introduced by data collection procedures, processing or given datum. uncertainty (of measurement) a parameter that characterizes the dispersion of measured values, or the – in which the value most likely lies. It can also be defined as an estimate of the limits of the error “true” in a measurement (where is defined as the difference between the theoretically-unknowable “error” “true” value of a parameter and its measured value).Standard uncertainty refers to uncertainty expressed as a standard deviation. vegetated vertical accuracy (VVA) An estimate of the vertical accuracy, on the 95th percentile, in – terrain where errors do not necessarily approximate a normal distribution. vertical accuracy The measure of the positional accuracy of a data set with respect to a specified – vertical at a specified confidence level or percentile. For additional and more comprehensive definitions of the terms above, reference is made to the Glossary of Mapping Sciences; Manual of Photogrammetry, 6th edition; Digital Elevation Model Technologies and Applications: The DEM Users Manual, 2nd edition; and/or the Manual of Airborne all published by ASPRS. Topographic Lidar, 6. Symbols, abbreviated terms, and notations ACCr the horizontal (radial) accuracy at the 95% confidence level – ACCz the vertical linear accuracy at the 95% confidence – American Society for Photogrammetry and Remote Sensing – CVA Consolidated Vertical Accuracy – FVA Fundamental Vertical Accuracy – GSD Ground Sample Distance – GNSS - Global Navigation Satellite System GPS Global Positioning System – IMU Inertial Measurement Unit – INS Inertial Navigation System – NGPS Nominal Ground Spacing NPD Nominal Pulse Density NPS Nominal Pulse Spacing National Standard for Spatial Data Accuracy NVA Non-vegetated Vertical Accuracy RMSEr the horizontal linear RMSE in the radial direction that includes both x- and y-coordinate errors.
systematic error – An error whose algebraic sign and, to some extent, magnitude bears a fixed relation to some condition or set of conditions. Systematic errors follow some fixed pattern and are introduced by data collection procedures, processing or given datum. uncertainty (of measurement) – a parameter that characterizes the dispersion of measured values, or the in which the “true” value most likely lies. It can also be defined as an estimate of the limits of the error in a measurement (where “error” is defined as the difference between the theoretically-unknowable “true” value of a parameter and its measured value).Standard uncertainty refers to uncertainty expressed as a standard deviation. vegetated vertical accuracy (VVA) – An estimate of the vertical accuracy, on the 95th percentile, in terrain where errors do not necessarily approximate a normal distribution. vertical accuracy – The measure of the positional accuracy of a data set with respect to a specified vertical at a specified confidence level or percentile. For additional and more comprehensive definitions of the terms above, reference is made to the Glossary of Mapping Sciences; Manual of Photogrammetry, 6th edition; Digital Elevation Model Technologies and Applications: The DEM Users Manual, 2nd edition; and/or the Manual of Airborne Topographic Lidar, all published by ASPRS. 6. Symbols, abbreviated terms, and notations ACCr – the horizontal (radial) accuracy at the 95% confidence level ACCz – the vertical linear accuracy at the 95% confidence – American Society for Photogrammetry and Remote Sensing CVA – Consolidated Vertical Accuracy FVA – Fundamental Vertical Accuracy GSD – Ground Sample Distance GNSS - Global Navigation Satellite System GPS – Global Positioning System IMU – Inertial Measurement Unit INS – Inertial Navigation System NGPS Nominal Ground Spacing NPD Nominal Pulse Density NPS Nominal Pulse Spacing National Standard for Spatial Data Accuracy NVA Non-vegetated Vertical Accuracy RMSEr the horizontal linear RMSE in the radial direction that includes both x- and y-coordinate errors.
ASPRS_Positional_Accuracy_Standards_for_Digital_Geospatial_Data_Draft_Rev7_V1.docx