Satu Dahlqvist
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Research Interests
Satu Dahlqvist has a total of 3 co-authors. Here are the top co-authors by number of shared publications:
- Martin Vermeer
Department of Surveying, Aalto University School of Engineering, Espoo, Finland
1 shared publication - Panu Salo
Department of Surveying, School of Engineering, Aalto University, P.O. Box 11200, Otakaari 1, FI-00076 Espoo, Finland
1 shared publication - Petri Rönnholm
Department of Built Environment, Aalto University, P.O. Box 15800, 00076 Aalto, Finland
1 shared publication
Latest Publications
- Open Access
- 31 August 2011
- Published by MDPI AG in Remote Sensing
- Vol. 3 (9) , 1902-1913
Evaluating the Correctness of Airborne Laser Scanning Data Heights Using Vehicle-Based RTK and VRS GPS Observations
In this study, we describe a system in which a GPS receiver mounted on the roof of a car is used to provide reference information to evaluate the elevation accuracy and georeferencing of airborne laser scanning (ALS) point clouds. The concept was evaluated in the Klaukkala test area where a number of roads were traversed to collect real-time kinematic data. Two test cases were evaluated, including one case using the real-time kinematic (RTK) method with a dedicated GPS base station at a known benchmark in the area and another case using the GNSSnet virtual reference station service (VRS). The utility of both GPS methods was confirmed. When all test data were included, the mean difference between ALS data and GPS-based observations was −2.4 cm for both RTK and VRS GPS cases. The corresponding dispersions were ±4.5 cm and ±5.9 cm, respectively. In addition, our examination did not reveal the presence of any significant rotation between ALS and GPS data.
- 31 August 2011
- Published by MDPI AG in Remote Sensing
- Vol. 3 (9) , 1902-1913
Open AccessEvaluating the Correctness of Airborne Laser Scanning Data Heights Using Vehicle-Based RTK and VRS GPS Observations
In this study, we describe a system in which a GPS receiver mounted on the roof of a car is used to provide reference information to evaluate the elevation accuracy and georeferencing of airborne laser scanning (ALS) point clouds. The concept was evaluated in the Klaukkala test area where a number of roads were traversed to collect real-time kinematic data. Two test cases were evaluated, including one case using the real-time kinematic (RTK) method with a dedicated GPS base station at a known benchmark in the area and another case using the GNSSnet virtual reference station service (VRS). The utility of both GPS methods was confirmed. When all test data were included, the mean difference between ALS data and GPS-based observations was −2.4 cm for both RTK and VRS GPS cases. The corresponding dispersions were ±4.5 cm and ±5.9 cm, respectively. In addition, our examination did not reveal the presence of any significant rotation between ALS and GPS data.