SLIDE 1
Asia Rice Technical demonstration site I Thailand
Preesan Rakwatin Researcher Geo-Informatics and Space Development Agency, THAILAND preesan@gistda.or.th
SLIDE 2 Radarsat-2 (VV,VH) acquisition for JECAM project
Date Beam Pass Taken 3-Apr-2014 Wide Fine (F0W2) Ascending Y 8-Apr-2014 Wide Fine (F0W2) Descending Y 27-Apr-2014 Wide Fine (F0W2) Ascending Y 2-May-2014 Wide Fine (F0W2) Descending Y 21-May-2014 Wide Fine (F0W2) Ascending Y 26-May-2014 Wide Fine (F0W2) Descending 14-Jun-2014 Wide Fine (F0W2) Ascending 19-Jun-2014 Wide Fine (F0W2) Descending 8-Jul-2014 Wide Fine (F0W2) Ascending 13-Jul-2014 Wide Fine (F0W2) Descending 1-Aug-2014 Wide Fine (F0W2) Ascending 6-Aug-2014 Wide Fine (F0W2) Descending 25-Aug-2014 Wide Fine (F0W2) Ascending 30-Aug-2014 Wide Fine (F0W2) Descending 18-Sep-2014 Wide Fine (F0W2) Ascending 23-Sep-2014 Wide Fine (F0W2) Descending 12-Oct-2014 Wide Fine (F0W2) Ascending 17-Oct-2014 Wide Fine (F0W2) Descending
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Radarsat-2, Wide (VV,VH) 3 April
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Radarsat-2, Wide (VV,VH) 27 April
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Radarsat-2 (HH,HV) Fine beam
31 Jan 24 Feb 20 Mar 13 Apr 7 May
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Field server for agriculture monitoring
SLIDE 10 NECTEC field server
The field server at a rice crop field in Suphanburi province, Thailand
10
Rain gauge tipping-bucket Digital Cameras; RGB and NIR sensors Pyranometer Anemometer Temperature and Humidity sensors
SLIDE 11
Photo at a rice crop field in Suphanburi province, Thailand on date of July 1, 2012
SLIDE 12
Image
The flowchart of rice crop height measurement
Band Selection
Filtering Thresholding Height Measuring Rice Crop Height
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SLIDE 14 Excessive green (ExG)
Vegetation Index
2 ExG g r b
Normalized Green-Red Difference Index (NGRDI)
g r NGRDI g r
ExGR is a difference of ExG and ExR.
ExGR ExG ExR
R r R G B G g R G B B b R G B
When rgb is normalised of RGB component.
1.4 ExR r g
…
Similar in RGB normalized When
To measure the levels of live green plants, vegetation indices will be considered
SLIDE 15 RGB image (Suphan Buri) Rice field segmentation
ExG is varied between [-2, 2].
2 ExG g r b Excessive Green :
_
1, ( , ) 0,
rice field
Mask i j (i, j) 0.2 ExG
Initial rice field mask
SLIDE 16 End of cycle
ExG index
Seedling Tillering Heading Normalized Excessive Green Excessive Green Harvest
Day of Cycle
SLIDE 17 Experiments
Comparative results of vegetation indices (ExG, NGRDI, ExGR)
Suphanburi Roi Et
SLIDE 18 Tillering Heading Seedling Harvest Tillering Heading Seedling Harvest
End of cycle
weed
Rice growing stages, Suphanburi
SLIDE 19 Tillering Heading Seedling Harvest Lighting interference Difficult case for analysing
Rice growing stages, Roi Et
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SLIDE 22 Using Time Series Segmentation for Deriving Vegetation Phenology Indices from MODIS NDVI Data
Ref: Chandola, V.; Dafeng Hui; Lianhong Gu; Bhaduri, B.; Vatsavai, R.R., "Using Time Series Segmentation for Deriving Vegetation Phenology Indices from MODIS NDVI Data," Data Mining Workshops (ICDMW), 2010 IEEE International Conference on , pp.202,208, 13-13 Dec. 2010
SLIDE 23
Nothing Nothing Increasing Maximum Decreasing
Ideal NDVI Data
SLIDE 24 nothing Increasing Maximum Decreasin g
𝑄0 𝑄
1
𝑄2 𝑄3
HMM for NDVI Data
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SLIDE 26
Result
SLIDE 27
Result
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Radarsat-2 (HH,HV) wall to wall acquisition
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Radarsat-2 (HH,HV) wall to wall acquisition
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Radarsat-2 (HH,HV) wall to wall acquisition
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Radarsat-2 (HH,HV) wall to wall acquisition
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Radarsat-2 (HH,HV) wall to wall acquisition
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Radarsat-2 (HH,HV) wall to wall acquisition
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Radarsat-2 (HH,HV) wall to wall acquisition
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Radarsat-2 (HH,HV) wall to wall acquisition
