Digital Elevation Model From stereo pair First Experience Naomi Jackson 18-Nov-2013.

Digital Elevation Model From stereo pair

First Experience

Naomi Jackson 18-Nov-2013

What is DEM?

Digital Elevation Model

is a 3-D representation of the terrain’s surface, created from elevation data

What is a Stereo Pair Image?

A stereo-pair image contains two views of a scene side by side. One of the views is intended for the left eye and the other for the right eye

These images are sometimes viewed with special equipment to direct each eye on to its intended target, but they are also often viewed without equipment.

DEM creation for Sabeto Catchment

SOPAC-SPC has purchased Stereo Pair image of Sabeto Catchment

Extract terrain parameters cost effective solution

DEM 1:10,000Soil mappingAgriculture planning for selected areasModeling water flow and mass movementWater catchment management for areas with high risk of flooding

Example of Stereo Pair

Right Image Left Image

Software

ERDAS 2013 – LPS TOOL

Method using sample dataMosaic the tiles

LPS Project manager tool• Create New Block File• Model Setup – Relational Function (World View

RPC)• Block Property Set up – Select Reference

Coordinate System• Load Stereo Pair - Assign Rational Polynomial

Coefficient (Provided with the WV2 Image)• Point Process• DEM Extraction

LPS project manager

Rational Polynomial Coefficient

This file is provided with the World View 2 Satellite imagery

Performs Correction – Corrects the Sensor distortion

Quick DEM Extraction

DEM extraction (2 steps)• the LPS Project Manager toolbar select the DTM Extraction button

• Select Output Folder

DEM Extraction Tool

Out Put

Challenges Loading imagery

Left Image Right image

Corresponding Rational Polynomial Coefficient

Next StepsImage data for FijiGround control point establishmentNew approach to software

SummaryDSM production software seems to work

Vinaka