Συμβολή Αυτόνομων Συστημάτων Πλοήγησης (UAV) για τη χαρτογράφηση διαρροών νερού

Transcription

1 Ημερίδα: ΟΛΟΚΛΗΡΩΜΕΝΗ ΧΡΗΣΗ ΔΟΡΥΦΟΡΙΚΩΝ, ΓΕΩΦYΣΙΚΩΝ ΚΑΙ ΥΠΕΡΦΑΣΜΑΤΙΚΩΝ ΤΕΧΝΟΛΟΓΙΩΝ ΓΙΑ ΠΑΡΑΚΟΛΟΥΘΗΣΗ ΔΙΑΡΡΟΩΝ ΝΕΡΟΥ ΣΕ ΔΙΚΤΥΑ ΥΔΡΕΥΣΗΣ ΣΤΗΝ ΚΥΠΡΟ. Συμβολή Αυτόνομων Συστημάτων Πλοήγησης (UAV) για τη χαρτογράφηση διαρροών νερού Δρ. Κυριάκος Θεμιστοκλέους ΤΕΧΝΟΛΟΓΙΚΟ ΠΑΝΕΠΙΣΤΗΜΙΟ ΚΥΠΡΟΥ Τμήμα Πολιτικών Μηχανικών και Μηχανικών Γεωπληροφορικής ΚΥΠΡΙΑΚΗ ΔΗΜΟΚΡΑΤΙΑ ΕΥΡΩΠΑΙΚΗ ΕΝΩΣΗ

2 Outline Objectives Materials/Methods Results Conclusions

3 Objectives The objective of the study was to use remote sensing technologies for the detection and monitoring of water leakages for water utility systems located in open fields. A low altitude system was deployed to observe water leakages from different heights. Figure 1. Positive crop mark (barley crops) formed over buried archaeological remains (left). Spectral signatures over buried relics and healthy vegetation (right).

4 Methods Ground spectroradiometric results indicate that spectral signatures of crops can be used as an alternative approach to identify water leakages. Low altitude airborne systems can fill the gap observed between satellite/aerial data with ground truth data retrieved in the field using spectroradiometers Satellite sensors Aerial sensors Low altitude sensors Figure 1. Positive crop mark (barley crops) formed over buried archaeological remains (left). Spectral signatures over buried relics and healthy vegetation (right). Ground spectroscopy Ground surface

5 Low altitude airborne systems

6 Materials Study area 3 Meter diameter balloon needed in order to hold the required payload

7 Materials Study area Ground control mechanism and aerial platform Low altitude airborne system including air balloon, spectroradiometer, and researcher wearing ground control mechanism with harness GER 1500 along with the spectralon panel

8 Materials Study area GER 1500 HR1024

9 Materials-Spectroradiometer Spectroradiometric measurement of reflectance panel Spectroradiometric measurement of target Remote Sensing Laboratory Limassol, CYPRUS

10 Materials Two VIS cameras were placed parallel in order to create stereopairs to conduct photogrammetry. The platform system with cameras lifted from the ground Remote Sensing Laboratory Limassol, CYPRUS

11 Materials The internal camera calibration test field of NTUA Remote Sensing Laboratory Limassol, CYPRUS

12 Materials- Infrared conversion Canon 350D Remote Sensing Laboratory Limassol, CYPRUS

13 Oktokopter

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15 Miniature spectroradiometer employed on UAV nm

16 Multispectral camera and photographs

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18 Infrared photograph of study area Remote Sensing Laboratory Limassol, CYPRUS

19 Methods Identification of pipeline from satellite imagery

20 Methods Identification of pipeline from satellite imagery Remote Sensing Laboratory Limassol, CYPRUS

21 Methods Identification of pipeline from satellite imagery Remote Sensing Laboratory Limassol, CYPRUS

22 Remote Sensing Laboratory Limassol, CYPRUS The low altitue system deployed over the leakage in the Lakatameia waterpipe

23 Water pipe UAV system deployed over the leakage in the Lakatameia waterpipe

24 UAV system deployed over the leakage in the Mandria waterpipe

25 Thermal camera

26 RESULTS

27 Results Ground spectral signatures of diffrent targets in the Lakatameia pipeline

28 Results Ground spectral signatures over dry and wet soil in the Lakatameia pipeline

29 Results Spectral signatures of wet soil in the Lakatameia pipeline at different heights using the low altitude system Remote Sensing Laboratory Limassol, CYPRUS

30 Results Spectral signatures of dry soil in the Lakatameia pipeline at different heights using the low altitude system Remote Sensing Laboratory Limassol, CYPRUS

31 Results The spectral signature tends to increase as the low altitude airborne system rises up (until 10 meters) while a small decrease of the reflectance is observed afterwards (16 meters) which can be associated with the larger area covered from the spectroradiometer. As well, the very near infrared range of the spectrum can be used on areas with bare soil or with vegetation.

32 Results

33 Results

34 Ground penetrating radar

35 Preliminary conclusions The preliminary results of this study have shown that remote sensing techniques are able to detect areas of the pipeline with water leakages. The use of ground spectroradiometric data along with the low altitude system indicates significant differences in the reflectance values in areas where the problem is observed.

36 Preliminary Conclusions The proposed system provides an innovative, low cost method which combines several remote sensing resources that can be used to detect sub-surface water leakages. The low altitude airborne sensor system is a useful resource to fill the gap observed between satellite/aerial data with ground truth data retrieved in the field using spectroradiometers. The study found that the spectral signatures changes as a result of elevation.