GPS Surveys within Falls Creek: Implementation and Processing for Aerial Photography (4434) |
| Chee Yin Lee, David Silcock, Lucas Holden and Sue Lynn Choy (Australia) |
Ms. Chee Yin Lee
Student
RMIT University
Geospatial Sciences
Bld. 12, lvl 11 394-412 Swanston Street
Melbourne
3001
Australia
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| Corresponding author Ms. Chee Yin Lee (email: s3019542[at]student.rmit.edu.au, tel.: + 61 4 37676602) |
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| [ abstract ] [ paper ] [ handouts ] |
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Published on the web 2010-01-14
Received 2009-11-19 / Accepted 2010-01-14 |
| This paper is one of selection of papers published for the FIG Congress 2010 in Sydney, Australia and has undergone the FIG Peer Review Process. |
FIG Congress 2010
ISBN 978-87-90907-87-7 ISSN 2308-3441
http://www.fig.net/resources/proceedings/fig_proceedings/fig2010/index.htm
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Abstract |
| This paper details GPS surveys undertaken in Falls Creek Ski Resort for a research project. Static, rapid-static and RTK GPS surveys were undertaken to establish a framework of accurate positional points with in the study area. Campaigns involved control surveys, coordination of photo control and elevation profiles, utilising the different GPS positioning techniques listed. The logistical problems of coordinating survey marks in areas of sparse survey control, deploying photo control targets over snow for image acquisition are discussed. The imagery acquired, in both winter (snow cover) and spring (no-snow cover), was later used to create surface models. The required positional accuracies resulting from the GPS surveys, for the photogrammetric validation purposes, were <20 mm for both Easting and Northing (MGA94, Zone 55), and <50 mm for elevation (AHD). The required post-processing and results of rigorous network adjustment are also detailed. GPS static data was network adjusted from simultaneous state-wide GPSnet data (Land Victoria’s GPS network) using MGA94 coordinates derived from the ARGN (Penna et al.,2005). Network adjustments were required to obtained the best possible coordinates for control marks and photo control targets. All GPS processing and network adjustments were performed using Trimble Geomatics Office™ (TGO™, 2003). Ausgeiod98 was used to model AHD elevations since no AHD benchmark was available. Network adjusted control marks agreed well with independent checks obtained from the online AUSPOS GPS data processing service. All network adjustment residuals satisfied the required accuracies. |
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| Keywords: Positioning; Photogrammetry |
