TY - GEN
T1 - Positional uncertainty in natural resource spatial data
T2 - Proceedings of GIS/LIS '91
AU - Bolstad, Paul
PY - 1991/12/1
Y1 - 1991/12/1
N2 - Errors were estimated for GIS spatial data derived via monoscopic interpretation of 230 mm (9-inch) aerial photographs. Positional and area error were observed for a range of photo scales, camera tilts, and relief. Average positional error was observed between 4 and 104 meters and varied positively with tilt and terrain range and inversely with scale. Maximum average errors were approximately 3 to 4 times overall averages. Average errors in polygon area were observed over a range of polygon sizes, from 40 to 600 meters. Average percent area error ranged from 1.3 to 10.7 percent and was positively related to tilt and terrain range and not related to scale or polygon size. The magnitude of these errors and the availability and cost of correction technologies suggest analytical methods for removing relief and tilt distortion should be used where possible.
AB - Errors were estimated for GIS spatial data derived via monoscopic interpretation of 230 mm (9-inch) aerial photographs. Positional and area error were observed for a range of photo scales, camera tilts, and relief. Average positional error was observed between 4 and 104 meters and varied positively with tilt and terrain range and inversely with scale. Maximum average errors were approximately 3 to 4 times overall averages. Average errors in polygon area were observed over a range of polygon sizes, from 40 to 600 meters. Average percent area error ranged from 1.3 to 10.7 percent and was positively related to tilt and terrain range and not related to scale or polygon size. The magnitude of these errors and the availability and cost of correction technologies suggest analytical methods for removing relief and tilt distortion should be used where possible.
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M3 - Conference contribution
AN - SCOPUS:0026394252
SN - 0944426751
T3 - GIS/LIS 1991 Proceedings
SP - 874
EP - 881
BT - GIS/LIS 1991 Proceedings
PB - Publ by ASPRS
Y2 - 28 October 1991 through 1 November 1991
ER -