A NEW COMPACT HYPERSPECTRAL IMAGING SYSTEM (COSI) FOR UAS

Transcription

1 A NEW COMPACT HYPERSPECTRAL IMAGING SYSTEM (COSI) FOR UAS A. SIMA, P. Baeck, S. Livens, J. Blommaert, S. Delalieux, B. Delauré - Flemish Institute for Technological Research VITO NV, Belgium M. BOONEN pcfruit vzv, Belgium

2 COMPACT HYPERSPECTRAL IMAGING SYSTEM COSI CAM Image size 2048 x 1088 Swath 40 m [150m ] Hypercube ground sampling distance Spectral range Spectral resolution Data storage Mass Dimensions 4 cm [15cm] nm nm (in prep.) 5-10 nm (72 bands) On-board 500 g 6cm x 7cm x 11.6cm EGU

3 HIGH SPATIAL RESOLUTION HYPERSPECTRAL DATA 3 1 m

4 VEGETATION INDEX MAP Data acquired in collaboration with CRA-W, Gembloux (B) 4 Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions

5 LINEARLY VARIABLE FILTERS STEP LINE FILTER» Line based interference filter» Filter with varying thickness deposited directly on the detector» Every image row (8 rows) captures different spectral band and cover different spatial location» Scanning motion required EGU Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions

6 RAW IMAGE CAPTURED BY THE COSI CAMERA 600nm 700nm 800nm 900nm EGU Data acquired in collaboration with pcfruit, St. Truiden (B)

7 DATA PROCESSING» Dedicated data processing chain developed in-house based on photogrammetry and computer vision principles raw image spectral image» GNSS data or ground control points not required but increase quality of data scaling and georeferencing» Radiometric and spectral corrections required to derive reflectance from DN values recorded by the sensor EGU » Need of calibrated spectral reference targets index map Action information map

8 HYPERSPECTRAL DATA CAPTURED BY THE COSI CAMERA» Orthorectified» Georeferenced» GSD = 4cm (@40m) EGU m 8 Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions

9 DIGITAL SURFACE MODEL EXTRACTED FROM COSI DATA EGU Data acquired in collaboration with pcfruit, St. Truiden (B)

10 CHLOROPHYL RELATED VEGETATION INDEX 10

11 CHLOROPHYL RELATED VEGETATION INDEX (ZONES) 11

12 DATA ACQUISITION CAMPAIGNS Number of test flights performed in 2015 covering diverse agricultural environment:» Strawberry field» Winter wheat» Natural grassland,» Pear orchard EGU Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions

13 Data acquisition campaigns Complete imaging system for small rotary or fixed wing UAS! Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions

14 STRAWBERRY FIELD EGU Data acquired in collaboration with pcfruit, Sint-Truiden (B) Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions

15 STRAWBERRY FIELD - FALSE COLOUR IMAGE( RGB = 801nm, 667nm, 604nm) COSI GSD = 2.0cm 0.5m RGB GSD = 2.6cm 15

16 WINTER WHEAT FALSE COLOUR (R=801.7nm, G=667.4nm, B=604nm) 2m Data acquired in collaboration with CRA-W, Gembloux (B) EGU

17 WINTER WHEAT - NDVI Data acquired in collaboration with CRA-W, Gembloux (B) 17 Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions

18 PEAR ORCHARD (R=801.7nm, G=667.4nm, B=604nm) GSD=4cm EGU Datasheet Datasheet LVF LVF Processing Processing Products Products Campaigns Campaigns Strawberries Strawberries Wheat Wheat Pears Pears Conclusions Conclusions

19 PEAR ORCHARD (R=801.7nm, G=667.4nm, B=604nm) GSD=4cm 1m 4m EGU Data acquired in collaboration with pcfruit, Kortenaken (B)

20 PEAR ORCHARD DIGITAL SURFACE MODEL GSD = 4cm EGU Data acquired in collaboration with pcfruit, Kortenaken (B)

21 CONCLUSIONS» Compact hyperspectral imaging system has been prototyped, suited for small RPAS, providing very high spatial resolution data» Functionality demonstrated in different agricultural environments» Data processing modules developed to provide wide variety of image products:» Orthorectified hypercube» Digital surface model» Vegetation index maps» Action maps COSI, GSD = 2cm» Commercialization process of the COSI system is ongoing in collaboration with Cubert Gmbh. Nex-6, 16mm lens, GSD = 0.8cm EGU Datasheet LVF Processing Products Campaigns Strawberries Wheat Pears Conclusions