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Ministry of Fishery and Mineral Resources, KiribatiMinistry of Land, KiribatiSPC-GSD

• Request for technical assistance sent to SPC’s Geoscience Division (GSD) by the Kiribati Ministry of Fisheries and Marine Resources Development,

• Identifying vulnerable low lying areas in planning for future developments.

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1) Collect High Resolution Topography data:

• Establish Common vertical datum to integrate Water level and Topography

data.

• Setting up image reference points (GCPs)

• UAV High-resolution topography mapping

2) Infrastructure mapping

3) Shoreline Change Analysis

4) Extreme Water Level Analysis + SLR Scenarios

5) Wrap data into a GIS package (i.e. Pac-Safe)

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• Temporary Tide Gauge:• A minimum of 35 days record• 25 hours manual observation

• 7 Bench Marks• Each BM to be surveyed 2 x 6 hrs

• Common Vertical Datum achieved by Levelling between BM and Tide Gauge

• Using an unmanned aircraft system, TRIMBLE UX5

• UAV flying at 75m above ground with 90% overlap, collecting data at a 2.4cm resolution.

• Ground Control Points minimum of 5 per flight

• Data output using TBC : Ortho-photo, Point clouds and a Digital Surface model (DSM)

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• Extent: Kiritimati Urban Centerincluding the villages of:

- Tabwakea- Tenessy- London

Resolution: 1m

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RTK Data Collection for Vertical Accuracy TestCoverage includes:

- Roads- clear field (soccer, basket ball fields)- beach profiles- Bush- Urban area (in-between buildings, etc…)

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0 0.5 1 1.5 2 2.50

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5RTK vs UAV − F1

RTK data (m)

UA

V d

ata

(m)

0 0.5 1 1.5 2 2.50

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5RTK vs UAV − F1 − noRD

RTK data (m)

UA

V d

ata

(m)

0 0.5 1 1.5 2 2.50

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5RTK vs UAV − F2

RTK data (m)

UA

V d

ata

(m)

0 0.5 1 1.5 2 2.50

1

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5RTK vs UAV − F2 − noRD

RTK data (m)

UA

V d

ata

(m)

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0 0.2 0.4 0.6 0.8 1 1.2 1.40

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20

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50

60

70RTK vs UAV − F1 − noRD

RTK data (m)

UA

V d

ata

(m)

0 0.2 0.4 0.6 0.8 1 1.2 1.40

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20

30

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60RTK vs UAV − F2 − noRD

RTK data (m)

UA

V d

ata

(m)

Abs( RTK Height –UAV Height)

Abs( RTK Height –UAV Height)

Based on the 41 years ofwater level record from theNOAA tide gauge, Kiritimati

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1 Yrs RP 20 Yrs RP10 Yrs RP 50 Yrs RP 100 Yrs RP

20902015 2030 20702050

RCP8.5RCP2.6 RCP6RCP4.5

A total of 85 Scenarios of Large to Extreme water level

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HAZARD + EXPOSURE

RISK

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• Include Population as Exposure data• Include SetBack Zone Layer

• Keep progressing on PACSAFE

• Critical Issue with Tide Gauge Reference Datum.

• Hazard layer do not consider shoreline response from SLR.

• PHASE 2 – Bathymetry Mapping, Wave Inundation Modeling.

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Other Tasks: Shoreline Change Analysis

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Other Tasks: Surveying all existing BMs from

Tabwakea to London

Other Tasks: UAV Pilot Training

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Tide Gauge

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• Established a control network for London • 6 new BM observed twice for 6 hours • Data send to AUSPOS Online Processing Service. • BM used to collect Ground Control Point for flights and for RTK

survey.• RTK points collected is further used to verify accuracy of cloud

points produced by photogrammetry.

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GCP