MILLIMETER LEVEL ACCURACY POINT POSITIONING IN WOODLAND AREA BY USING HYBRID METHOD


Pırtı A.

Forestry Ideas, vol.28, no.1, pp.119-131, 2020 (Refereed Journals of Other Institutions) identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 1
  • Publication Date: 2020
  • Title of Journal : Forestry Ideas
  • Page Numbers: pp.119-131

Abstract

The hybrid techniques (rapid static/total station) can be very helpful technology for centimetre and millimetre level positioning in the woodland. Point Positioning with CORS GNSS (Continuously Operating Reference Stations Global Navigation Satellite System) in the woodland is a significant challenge in terms of time saving to obtain high accurate coordinates of the points. The time for integer carrier-phase ambiguity solution takes approximately one-hour or more time for point positioning under the woodland with GNSS surveys. In this study, hybrid techniques for estimating point coordinates under woodland has been performed, which gives the positioning results with millimetre and centimetre level accuracy and nearly 30 minutes are required to provide the new point location in the woodland. The proposed method may also have practical usage for forest-woodland areas applications with desired accuracy at mm level, which is reached in a short observation time. A fieldwork has been performed to obtain coordinates of the point (K) in woodland with CORS GNSS system and supplementary measurements by establishing two control points (T1 , T2 ) observed by rapid static method located at the border of the woodland. On the other hand, the coordinates of point (K) have been also gained by using a static method (3 hours observation). The coordinate differences (static-hybrid) show that a satisfactory solution for woodland is reached at mm level in a short observation time.