Height Evaluation and Linear Accuracy of Digital Level, Total station, GPS and Orthophoto

Authors

  • Abdulrahman F. Heeto Department of Surveying Engineering, University of Duhok, Kurdistan Region – Iraq
  • Yousif Y. Zaia Department of Surveying Engineering, University of Duhok, Kurdistan Region – Iraq
  • Sami M. Gilyane Department of Surveying Engineering, University of Duhok, Kurdistan Region – Iraq

DOI:

https://doi.org/10.25007/ajnu.v7n4a268

Keywords:

Digital level, Total station and DGPS, Orthophoto, Linear accuracy, Analysis and Comparison

Abstract

In this research, Digital level (DL), Total station (TS) and GPS were used to assess accuracy and precision of the height component. Field observations were implemented in two tested areas. A reference network which consisted of 34 points on area1 and 10 control points on area2 which had been observed five times using Digital level, RTK-GPS and Total station (TS) where Digital level was considered as a base for comparison. Several known control points were used as check points to evaluate the accuracy of measurements. According to the obtained results, TS and GPS-RTK measurements were compared with the adjusted reference points measured by precise Digital level (DNA 03). Around ±15 mm standard deviation for TS and ±13.5 mm for GPS were achieved. Linear accuracy of TS, GPS, and orthophotos measurements from Vossing German Company were also investigated in regular features within the same tested areas. The actual lengths were measured with steel tape up to a millimeter accuracy and were considered as being a base for comparing. The maximum deviation 22mm accuracy has been obtained in area2 and 12 mm in area1. The study shows that the extracted features from orthophotos had less accuracy in hilly regions due to relief displacement whereas they were more accurate in gentle slopes.

Downloads

Download data is not yet available.

References

1. ABDULRAHMAN, F. H. 2013. The use of targets to improve the precision of Mobile Laser Scanning.. PhD., thesis, University of Nottingham.
2. AHMED, E. M. 2012. Performance Analysis of the RTK Technique in an Urban Environment. Australian Surveyor, 45, 47-54.
3. AMIN, M. N. K. A. Z. M. Multipath Error Detection Using Different GPS Receiver’s Antenna.. Proceedings of the 3rd FIG Regional Conference., October 3-7, 2004. 2004 Jakarta, Indonesia..
4. BORGELT S C., HARRISON J D., HARRISON, K. A. S. & BIRRELL., S. J. 1996. Evaluation of GPS for Applications in Precision Agriculture. Appl. Eng. Agric., 12, 633–638.
5. CHEKOLE., S. D. 2014. Surveying with GPS, total station and terrestrial laser scanner: a comparative study.. Master of Science thesis in Geodesy Royal Institute of Technology (KTH), Stockholm, Sweden.
6. EHSANI, M. R., UPADHYAYA, S. K. & MATTSON, M. L. 2004. Seed Location Mapping Using RTK GPS. Trans. ASAE., 47, 909-914.
7. JONSSON K.O., ANDERSSON A., JACOBSSON S.O., VANDEVOORDE S., LAMBERT D.M. & C.J., F. 2003. SWEPOS Network-RTK Services, status, applications and experiences.. ION GPS/GNSS Portland, Oregon, U.S.A.
8. KOSTOV, G. P. 2011. Using of both Fast Static and RTK Modes for GNSS Determinations to Obtain Required high Accuracy and Productivity, According to the Current Possibilities of the IT.. Marrakech, Morocco.
9. LIN, L. S. Application of GPS RTK and total station systems on dynamic monitoring land use.. Proceedings of the ISPRS Congress., 2004 Istanbul, Turkey
10. SJÖBERG, L. E. 2012. Lecture notes on the course AH2923 Global Navigation Satellite System (GNSS), Division of Geodesy, KTH, Stockholm, Sweden.

Published

2018-12-08

How to Cite

Heeto, A. F., Zaia, Y. Y., & Gilyane, S. M. (2018). Height Evaluation and Linear Accuracy of Digital Level, Total station, GPS and Orthophoto. Academic Journal of Nawroz University, 7(4), 27–37. https://doi.org/10.25007/ajnu.v7n4a268

Issue

Section

Articles