Development the map of spatial radiation dose by using unmanned helicopterat low altitude and development of vegetation and land cover map

using hyperspectral technology

３． Expected effect(1)Development of spatial radiation dose at basins of village forest . Basins of village forest is the regular vocation of village forest people.(2)Construction of GIS system that have potential to formulate radioactivity control by combine vegetation and land cover map with spatial radiation dose.

１． Flow of experiment

２． Experimental objective(1)The low-cost and highly efficient spatial radiation monitoring system using unmanned helicopter .(2) Development of vegetation and land cover map using hyperspectral images.(3)Management of the spatial information by the GIS.

山木屋地区における山地斜面の空間線量率分布。この測定を無人ヘリで行うことにより、低コスト、簡便に空間線量率マップを作成。

No.6

Technical summary

Measuring the spatialRadiation dose automaticallywith Minisurveyor.

Automatic measurement of hyperspectral data and spatial radiation dose by unmanned helicopter with winch system.

Hyperspectral Camera

Winch

Scintillator

Measuring result ofspatial radiation doseat elementary school.

Vegetation and landcover map from the hyperspectral data.

Spatial radiation dose map atYamakiya mountain slope. Using unmanned helicopter, we can make this map at low costand more efficiently.

　

　 　

Developing the easy and safe mapping system for spatial radiation dose distribution at low altitude in living space including surrounding forest slope using autonomous unmanned helicopter (UAV), and vegetation/land cover map using hyperspectral technique . Obtained data are evaluated for its utility for decontamination planning using geographic information system (GIS).

１． Developing mapping system for spatial radiation distribution map at the watershed level using UAV.２． Developing the vegetation/land cover mapping method using hyperspectral technique. ３． Constructing measured information management system using GIS

Kawamata （ Fukushima ）

Content of the project

Overview of the project

Main place

Chiba University

　 Results 　1.Low-cost, high efficiency radiation monitoring by electric multicopter （ Minisurveyor ）

2. High-performance, accurate monitoring by YAMAHA/RMAX　unmanned engine helicopter

3.Development of vegetation and land cover map using hyperspectral images

Spatial radiation dose rate map at Yamakiya ElementarySchool

Below　is　the　results　of　air　dose　rate　in　August　and　November　at　Yamakiya　Elementary　Schoool.　Minisurveyor　can　measure　the　spatial　dose　over　surplus　soil,　that　is　unmeasurable　by　walking　survey.　The　demonstration　experiment　of　the　autonomous　(programmed)　flying　show　that　Minisurveyor　can　achieve　high　efficiency　automatic　radiation　monitoring　(see　the　right　figure　below)

Results of spatial dose measurement by aoutonomous (programmed) flying

Figures　shows　different　visible-near　infrared　Spectra　in　each　land　coverage　and　roof　materials.　Each　roof　mateirials　have　different　spectral　characteristics　(left　figure)　and　image　classiication　can　be　achieved　based　on　these　spectral　features.It　is　necessary　to　acquire　the　ground　survey　(grand　truth　data)　to　specify　the　kind　of　each　classification　item.

Hyperspectral characteristics of each land cover (left), false color image (middle), image classificatoin result (right).

・ We　developed　the　low-cost　and　highly　efficient　spatial　radiation　monitoring　system　using　unmanned　helicopter　(Minisurveyor,　YAMAHA/RMAX)　covering　the　　area　including　not　only　the　field　in　the　low　ground　region　and　the　place　of　residence　but　also　forests　and　waste　land　where　the　walking　survey　is　impossible.　・ We　also　developed　the　hyperspectral　(super-multi　wavelength)　aerial　photographing　system　that　can　obtain　continuous　spectrum　between　the　visible　and　　near　infrared　region　and　demonstrated　the　land　cover　classification　using　　hyperspectral　image.・ We　verified　ideal　way　of　managing　geographic　information　system　(GIS)　for　combining　the　obtained　spatial　information　with　various　attributes　about　land.

The　experiment　demonstrated　that　unmanned　helicopter　can　conduct　the　proximitiy　measurement　above　the　tree　crown　of　a　forest　(immeasurable　by　walking　survey),　and　estimate　the　effect　of　the　circumference　geogra-phical　feature　given　to　a　space　dose　by　acquring　the　data　according　to　altitude　in　several　different　topogra-phic　features.

Measuring result at each alititude over the schoolyard

Spatial dose rate at the north side of the elementary school

Measuring result at each alititude over the paddy field

Spatial dose rate over the forest

August,2013 November,2013

Altitude:10mVelocity:　2m/sec