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 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, based 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 datum, at a specified confidence level or percentile. For additional terms 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 and notations ACCr the horizontal (radial) accuracy at the 95% confidence – ACCz the vertical linear accuracy at the 95% confidence – ASPRS American Society for Photogrammetry and Remote Sensing – CVA Consolidated Vertical Accuracy – DEM Digital Elevation Model – DTM Digital Terrain Model – 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 Point Spacing NPD Nominal Pulse Density NMAS National Map Accuracy Standard NPS Nominal Pulse Spacing NSSDA National Standard for Spatial Data Accuracy
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, based 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 datum, at a specified confidence level or percentile. For additional terms 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 and notations ACCr – the horizontal (radial) accuracy at the 95% confidence ACCz – the vertical linear accuracy at the 95% confidence ASPRS – American Society for Photogrammetry and Remote Sensing CVA – Consolidated Vertical Accuracy DEM – Digital Elevation Model DTM – Digital Terrain Model 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 Point Spacing NPD Nominal Pulse Density NMAS National Map Accuracy Standard NPS Nominal Pulse Spacing NSSDA National Standard for Spatial Data Accuracy
ASPRS_Positional_Accuracy_Standards_for_Digital_Geospatial_Data_Edition1_V1_FinalDraftForPublication.docx