esa eofi kick-off meeting – 17/05/2010 1 earth observation for international financial...
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1www.eurosense.com
Earth Observation for International Financial Institutions Service Trial 3
VHR satellite imagery to support land tenure mapping in Madagascar
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Land titling benefits
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QuestionsIntended useIssues
Land titling can increase investment in land, agricultural productivity, and land values in different ways (assurance, realizability, collataralability)
New land tenure guidelines to formalize land tenure through decentralization of land management
Land tenure certificate
Land tenure title
Reserved Route
Public domain
Actualized PLOFPerformed by municipalities
Image base
Initial PLOF Made available by the administration foncière
Results
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Initial PLOF guidelines
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Results QuestionsIntended useIssues
Making an "Initial PLOF" in the context of a modernized land tenure office: the preconditions: Provision of an “image base” (orthophoto, digital satellite image).
This image database will be used as a visual basis for the delineation of titled land parcels, dependencies in the public domain, and areas with specific statutes.
Provision of data on land ownership, alphanumeric or on paper. Capacity building: Territorial delimitation using satellite imagery
Land rights formalization has been promoted as a way to encourage agricultural investment and stimulate land markets. Reducing land tenure insecurity is seen as a legitimate role for the state, and often as a cost-effective intervention.
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AOI
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QuestionsIntended useIssues
Within this project an image base is being delivered over 11
municipalities in the Lalangina, Isandra, and Ambalavoa district.
Data should facilitate
Iarentsina Firaisantsoa
Soatanana
Andoharanomaitso
Soaindrana
Androy
Alatsinainy
Ivoamba
Fandrandava
Mahatsinjony
Taindambo
Sahambavy
Ambalakely
PROSPERER
Results
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Delivered images
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Results QuestionsIntended useIssues
23 Kompsat2 images received (June 27th – October 10th)
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Image mosaic
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Results QuestionsIntended useIssues
Images orthorectified using ASTER DEM 25 GPS points image RPCs tie points
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Issues – Reference data
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Results QuestionsIntended useIssues
Difficult orthorectification due to lack of reference data DEM
• Solved by combining SRTM and ASTER DEM• Combined DEM produced (horizontal resolution 30m)
Horizontal reference• Topo received, however very different location then Landsat GLS and
Kompsat2 RPCs• 25 GPS points provided by PROSPERER
Processing details• GPS points taken as main reference• Images linked together with tie points in overlap regions
Effects:
- Limited locational accuracy, however still a huge improvement on what is currently available
- Relative accuracy + field measuring is accurate
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Issues – Kompsat2 data
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Results QuestionsIntended useIssues
Slow progress of image acquisitions First months
• Very low priority by satellite provider• Situation mentioned to ESA
After ESA interference• Higher priority given by satellite provider• Quick acquisition of remaining images
Last images• Non-delivery of last images due to satellite providers’ error• Issue solved after 4 weeks (last images received 16/11)
Effects:
- Big delay of service delivery
- Non-visible to end user
Date Images
27/06 3
30/07 2
09/09 2
14/09 2
17/09 3
27/09 3
07/10 2
10/10 5
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Issues – Image quality
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Results QuestionsIntended useIssues
Kompsat2 image errors Colour difference in first image track =>
Error in RPCs• Not feasible to correctly orthorectify image track• Issue solved by automatic image shift
Displacement between PAN & XS• Image not validated• Resulted in later miscommunications
Effects:
- Delay of service delivery
- Only colour difference in the east visible to end user
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Issues – User software
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Results QuestionsIntended useIssues
Delivered images Images now delivered as municipal clip Municipalities buffered with 200m
ArcView 3.2 limits Can only handle raster data < 2 Gb Municipalties sometimes > 2 Gb In the future: deliver tiles
Effects:
- Extra processing was needed
- Some municpalities have been clipped into multiple tiles
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Field delineation example
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Results QuestionsIntended useIssues
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Next steps? How can we help?
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Results Questions
System of receiving user feedback? IFAD Local users
Which users will/should be contacted?
Should we (after a first feedback round) adjust the delivery/ products to improve reception of the data. Colour adjustments False colour images Creation of land tenure examples (cfr. Certificates)
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Issues Intended use
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Remote Sensing ApplicationsRemote Sensing Applications
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