Asia Rice Technical demonstration site I Thailand Preesan Rakwatin - PowerPoint PPT Presentation

Asia Rice Technical demonstration site I Thailand Preesan Rakwatin Researcher Geo-Informatics and Space Development Agency, THAILAND preesan@gistda.or.th

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

Radarsat-2, Wide (VV,VH) 3 April

Radarsat-2, Wide (VV,VH) 27 April

Radarsat-2 (HH,HV) Fine beam 31 Jan 24 Feb 20 Mar 7 May 13 Apr

Field server for agriculture monitoring

NECTEC field server Pyranometer Rain gauge Anemometer tipping-bucket Temperature and Humidity sensors Digital Cameras; RGB and NIR sensors The field server at a rice crop field in Suphanburi province, Thailand 10

Photo at a rice crop field in Suphanburi province, Thailand on date of July 1, 2012

Image Band Selection Filtering Thresholding Height Measuring Rice Crop Height The flowchart of rice crop height measurement

Vegetation Index To measure the levels of live green plants, vegetation indices will be considered When rgb is normalised of RGB component. Excessive green (ExG) R      r ExG 2 g r b   R G B G  g   Normalized Green-Red Difference Index (NGRDI) R G B B   b g r    NGRDI R G B  g r ExGR is a difference of ExG and ExR. …   ExGR ExG ExR Similar in RGB normalized    When ExR 1.4 r g

Rice field segmentation     RGB image (Suphan Buri) Excessive Green : ExG 2 g r b ExG is varied between [-2, 2]. Initial rice field mask   1, ExG (i, j) 0.2   Mask ( , ) i j rice _ field  0, otherwise

Seedling Heading Tillering Harvest End of cycle Normalized Excessive Green ExG index Excessive Green Day of Cycle

Experiments Comparative results of vegetation indices ( ExG , NGRDI , ExGR ) Suphanburi Roi Et

Rice growing stages, Suphanburi Tillering Heading Tillering Heading End of cycle weed Seedling Harvest Seedling Harvest

Rice growing stages, Roi Et Tillering Heading Lighting interference Difficult case for analysing Harvest Seedling

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

Ideal NDVI Data Maximum Increasing Decreasing Nothing Nothing

HMM for NDVI Data nothing 𝑄 0 𝑄 3 𝑄 𝑄 2 1 Decreasin Maximum Increasing g

Result

Result

Radarsat-2 (HH,HV) wall to wall acquisition

Radarsat-2 (HH,HV) wall to wall acquisition

Radarsat-2 (HH,HV) wall to wall acquisition

Radarsat-2 (HH,HV) wall to wall acquisition

Radarsat-2 (HH,HV) wall to wall acquisition

Radarsat-2 (HH,HV) wall to wall acquisition

Radarsat-2 (HH,HV) wall to wall acquisition

Radarsat-2 (HH,HV) wall to wall acquisition