High Resolution DEM Creation for Majuro Airport

Elizabeth Lomani

MarTina Corporation

Airport Background1. Majuro, Marshall Islands2. Elevation: 2 meters3. Max Runway: 2407 x 46 meters4. Accommodate 25 flights per week

International flights Cargo flights Domestic flights

5. Important infrastructures1. Airport2. Water catchment for the island

Important infrastructures

ReservoirPipelines

Airport

Steps to Creating the Airport DEMResults from topographic surveyConvert DXF to GIS formatDigitised spot heightsExport to Access for data integrity checksExport to ErdasDTM creation in Erdas

Convert DXF to GIS format• Too many

files to go through.• Opening

files proved to be tedious and time consuming

Digitising spot heights

Contour lines without elevation values

Extracting elevation values from original file

More than one feature on one file

1 2

3

Result of Digitising

5 people digitised the spot heights

14,000 points digitised

10,00 points - useful

Export to Access for data integrity checks

Null ValuesUnrealistic heightsConversion from

feet to meters

DTM Creation

Surface model was created

Holes in the middle of the airport Negative valuesTypos

2030 Sea level rise inundation model

16cm sea level riseSpatial Analysis

Area loss20% Infrastructure

affected

2055 Sea level rise inundation model

30cm sea level rise

Spatial AnalysisArea loss50%

Infrastructures affected

2090 inundation model

60cm sea level rise

Spatial AnalysisArea lossMore than 90%

Infrastructures affected

Thanks