%0 Journal Article
%T Static Horizontal Positions Determined with a Consumer-Grade GNSS Receiver: One Assessment of the Number of Fixes Necessary
%A Pete Bettinger
%A Krista Merry
%J Croatian Journal of Forest Engineering
%D 2012
%I University of Zagreb
%X Over the course of a year, a consumer-grade GNSS receiver was used to collect data in three forest types in northeastern Georgia (USA). During each visit, fifty position fixes were collected to estimate a horizontal position. Since there has been a significant amount of debate regarding the appropriate number of position fixes to collect to determine a position, this analysis was conducted to understand whether the static horizontal position error (a) changed over the collection period of fifty position fixes, (b) was significantly different than a single position fix collected to estimate the positions, and (c) was a function of forest type. We failed to reject the hypothesis that static horizontal position accuracy does not significantly change with increasing numbers of position fixes collected to determine a position, yet we favor rejecting the hypothesis that trends do not differ by forest type or by density of trees per unit area. The results are not entirely conclusive, and the time (season) of year may influence the results observed within certain forest types (e.g., young coniferous forests).We observed a trend that the static horizontal position accuracy in a young coniferous forest, on average, improved from a position determined by a single position fix to a position determined from the average of fifty position fixes. A much less relevant trend in accuracy was observed in a deciduous forest, and no trend at all was observed in an older coniferous forest.
%K global navigation satellite systems
%K static horizontal position accuracy
%K root mean squared error
%K linear regression
%U http://hrcak.srce.hr/file/128050