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Photo:DavidBrazier/IWMIPhoto:TomvanCakenberghe/IWMIPhoto:DavidBrazier/IWMIPhoto:DavidBrazier/IWMIWater for a food-secure w...
www.iwmi.orgWater for a food-secure worldIWMI and Geo Informatics• Rainfall Estimation fromNDVI using WaveletTransformatio...
www.iwmi.orgWater for a food-secure worldIWMI and Geo Informatics• Time series analysis of Boropaddy area in West Bengal• ...
www.iwmi.orgWater for a food-secure worldSpatial Resources• Both proprietary and open source softwareused for RS/GIS• Data...
www.iwmi.orgWater for a food-secure worldIntroduction• Groundwater is the primarysource of fresh water in Jaffnadistrict• ...
www.iwmi.orgWater for a food-secure worldIntroduction• Hence to preserve the qualityof groundwater in Jaffna, it isimporta...
www.iwmi.orgWater for a food-secure worldObjectives– To develop amethodology to extractagro-wells using highresolution ima...
www.iwmi.orgWater for a food-secure worldData• WorldView-2 and QuickBird-2• 12 Different dates images from 2010 and2011• A...
www.iwmi.orgWater for a food-secure worldMethodologyShapeSizeMultispectal Image Panchromatic ImagePansharpeningAgriculture...
www.iwmi.orgWater for a food-secure worldExtracting Agriculture areaa) Original XS image b) probability for a one class c)...
www.iwmi.orgWater for a food-secure worldExtracting Agro-wella) Agriculture masked image from pansharpen image b) Probabil...
www.iwmi.orgWater for a food-secure worldResults
www.iwmi.orgWater for a food-secure worldResults
www.iwmi.orgWater for a food-secure worldResultsNo. of Identified Agro-wells : 19,905 (excluding Delft Island)Agro-wells a...
www.iwmi.orgWater for a food-secure worldResults – Agro-well Density
www.iwmi.orgWater for a food-secure worldResults - Agro-well hot spots
www.iwmi.orgWater for a food-secure worldValidating the Result• Filed visit forValidation• 646 agro-wellsrandomly pickedGr...
www.iwmi.orgWater for a food-secure worldValidating the Result• Error of Omission=9.93%• Error ofCommission=0.17%• Overall...
www.iwmi.orgWater for a food-secure worldAnother Application: Counting rooftops in Jaffna to model rainwaterharvesting
www.iwmi.orgWater for a food-secure worldAnother Application: Counting rooftops in Jaffna to model rainwaterharvesting
www.iwmi.orgWater for a food-secure worldDiscussion• Tree shadowsconfuse with well• Wells partially or fullycovered by tre...
www.iwmi.orgWater for a food-secure worldDiscussion• Most of the timeaccuracy depends onthe quality of theimage
www.iwmi.orgWater for a food-secure worldConclusion• Hi-resolution image and object basedclassification methodology are go...
www.iwmi.orgWater for a food-secure worldRecommendation• To improve the accuracy– Use LIDAR if possible– Same date and sam...
www.iwmi.orgWater for a food-secure worldLandsat 8THANK YOU
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Monitoring spread of Agro wells in Jaffna using hi-resolution images

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Rajah Ameer, Salman Siddiqui, Aditya Sood, Herath Manthrithilake, Ranjith Ariyaratne
Sri Lanka
Geospatial Forum
10 June 2013

Published in: Technology, Business
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Transcript of "Monitoring spread of Agro wells in Jaffna using hi-resolution images"

  1. 1. Photo:DavidBrazier/IWMIPhoto:TomvanCakenberghe/IWMIPhoto:DavidBrazier/IWMIPhoto:DavidBrazier/IWMIWater for a food-secure worldwww.iwmi.orgRajah Ameer, Salman Siddiqui, Aditya Sood, HerathManthrithilake, Ranjith AriyaratneSri LankaGeospatial Forum10 June 2013Monitoring Spreadof Agro-wells inJaffna usingHi-resolutionImages
  2. 2. www.iwmi.orgWater for a food-secure worldIWMI and Geo Informatics• Rainfall Estimation fromNDVI using WaveletTransformation• Flood analysis usingMODIS time seriesimages• Irrigated Area Mappingfor SA, Asia and Africa• Land use and Landcover changes inCambodia andMyanmar
  3. 3. www.iwmi.orgWater for a food-secure worldIWMI and Geo Informatics• Time series analysis of Boropaddy area in West Bengal• Mapping of Snow Coverand Snow Melt changes inHKH region• -----------------------• Managing andDissemination of SpatialData• Development of Water DataPortal and Sri Lanka WaterInformation System• Development of SpecificData Portal for SpecificProject
  4. 4. www.iwmi.orgWater for a food-secure worldSpatial Resources• Both proprietary and open source softwareused for RS/GIS• Database – Open Source• Web Map Servers – Proprietary & OpenSource• High-end Workstations for Processing• Storage space - 50 TB
  5. 5. www.iwmi.orgWater for a food-secure worldIntroduction• Groundwater is the primarysource of fresh water in Jaffnadistrict• Rainfall is inadequate or occursduring one season only.• Farmers are interested incultivating high-value crops whichare in turn high water-demandingas well.• Ground water aquifer is shallow• Agro-wells are large-diameterwhich allow larger quantities ofwater to be extracted at a time forirrigation.• Jaffna already has a salinityproblem, which is exacerbate dueto this over-extraction of waterfrom agro-wells.
  6. 6. www.iwmi.orgWater for a food-secure worldIntroduction• Hence to preserve the qualityof groundwater in Jaffna, it isimportant to properly manageand monitoring the agro-wellsin the district.• Immediate requirement for themanagement of agro-wells forthe sustainable developmentof the Jaffna District.• For this purpose, identificationand location (geo-referencing)of agro-wells are veryimportant to study and managethe spatial distribution of agro-wells
  7. 7. www.iwmi.orgWater for a food-secure worldObjectives– To develop amethodology to extractagro-wells using highresolution images– To map agro-wellsdistribution in thewhole Jaffna district– Identify agro-well hotspots
  8. 8. www.iwmi.orgWater for a food-secure worldData• WorldView-2 and QuickBird-2• 12 Different dates images from 2010 and2011• Area ~1,200 Sq. km• Size ~ 250 GB
  9. 9. www.iwmi.orgWater for a food-secure worldMethodologyShapeSizeMultispectal Image Panchromatic ImagePansharpeningAgriculture area WellsFeature ProbabilityTraining SamplesProbability ThresholdTraining SampleFeature ProbabilitySegmentationFilteringVectorizationProbability ThresholdMulticlass FeatureExtractionInput Image Mask Agriculture AreaFilteringVectorizationGeometry of Object (Well)Single Feature ExtractionOBJECTBASEDInput Image
  10. 10. www.iwmi.orgWater for a food-secure worldExtracting Agriculture areaa) Original XS image b) probability for a one class c) segmented and filtered image d) segments convertedvector e) extracted vector after applying the probability threshold f) Extracted agriculture lands
  11. 11. www.iwmi.orgWater for a food-secure worldExtracting Agro-wella) Agriculture masked image from pansharpen image b) Probability layer for wells c) Pixels selected using probability threshold d)Filtered pixels of wells e) converted vector objects f) agro wells on the agriculture land after performing geometric cleaning andtemplate matching
  12. 12. www.iwmi.orgWater for a food-secure worldResults
  13. 13. www.iwmi.orgWater for a food-secure worldResults
  14. 14. www.iwmi.orgWater for a food-secure worldResultsNo. of Identified Agro-wells : 19,905 (excluding Delft Island)Agro-wells are not evenly distributedSome areas have high agro-well density
  15. 15. www.iwmi.orgWater for a food-secure worldResults – Agro-well Density
  16. 16. www.iwmi.orgWater for a food-secure worldResults - Agro-well hot spots
  17. 17. www.iwmi.orgWater for a food-secure worldValidating the Result• Filed visit forValidation• 646 agro-wellsrandomly pickedGroundImageAgro-well No Agro-wellAgro-well 581 1No Agro-well64 0
  18. 18. www.iwmi.orgWater for a food-secure worldValidating the Result• Error of Omission=9.93%• Error ofCommission=0.17%• OverallAccuracy=90.07%
  19. 19. www.iwmi.orgWater for a food-secure worldAnother Application: Counting rooftops in Jaffna to model rainwaterharvesting
  20. 20. www.iwmi.orgWater for a food-secure worldAnother Application: Counting rooftops in Jaffna to model rainwaterharvesting
  21. 21. www.iwmi.orgWater for a food-secure worldDiscussion• Tree shadowsconfuse with well• Wells partially or fullycovered by trees aresometimes difficult tobe identified
  22. 22. www.iwmi.orgWater for a food-secure worldDiscussion• Most of the timeaccuracy depends onthe quality of theimage
  23. 23. www.iwmi.orgWater for a food-secure worldConclusion• Hi-resolution image and object basedclassification methodology are goodenough to extract Agro-wells• Policy should be developed to controldigging more wells and over extraction ofwater in the indentified agro-well hot spotareas
  24. 24. www.iwmi.orgWater for a food-secure worldRecommendation• To improve the accuracy– Use LIDAR if possible– Same date and same sensor images• Similar method can be applied for different kind of featureextraction in the island using High resolution images• Possible Usage– Number of Wells in the dry zone– Impact on agriculture yield/production– Optimum Ground Water Extraction– GW Quality studies– Rainwater Harvesting
  25. 25. www.iwmi.orgWater for a food-secure worldLandsat 8THANK YOU

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