Work in progress

• Adapting SPSF (Small patch sphere fit) to fit to higher order shapes (as bellows window)

• Investigating harmonics

– Via surface model

– Via test of thick window

• Writing two papers as potential NIM publications & Mucool notes)

– “Development of photogrammetric methods for quality control of non standard windows”

– “Development of photogrammetric methods of stress analysis”

Photogrammetry Photogrammetry measurementsmeasurements

John with the digital cameraJohn with the digital camera

Twelve photos are taken Twelve photos are taken

at various pressure stagesat various pressure stages

Preparation of the test at NIUPreparation of the test at NIU

View of the window, View of the window, scale bars and targeting scale bars and targeting sys. sys.

View of the window, video View of the window, video camera, digital camera and camera, digital camera and tripod and projectortripod and projector

New presentation tool from GSI

• 3D Viewer– Rays– Camera stations– Scale bar – Autobar (Crucifix or Southern Cross?)– Shapes– Object targets

Scan image

Detect Autobar and coded targets

Resect for initial cameral parameters

Make a list of coded targets in resected images

If a coded target is in >=2 images

Triangulate coded target coordinates

Triangulate object coordinates

Run first bundle (refine camera parameters and coded target positons)

Resect camera parameters

Does image contain >= 4 coded targets?

Automatch

Run final bundle

Photogrammetric Record, 16(93): 503–517 (April 1999)

AN APPLICATION OF CLOSE RANGE

PHOTOGRAMMETRY IN DOLPHIN STUDIES

By S. BRA¨ GER and A. K. CHONG

University of Otago

Abstract

Dolphins are agile animals and are very difficult to measure at sea.

However, for the conservation of threatened or endangered species,

measurement may be vital because it allows a demographic analysis of the

population. Hector’s dolphin (Cephalorhynchus hectori) is a rare species

living only in coastal waters around New Zealand where it is studied from

small boats. This paper describes a stereophotogrammetric technique

developed to measure body length accurately at sea without having to

capture the individual. Constant calibration with the use of a control frame

allowed accurate body length measurements of dolphins to be made with

this low cost system, with a measurement error of 4 per cent to 6 per cent

of actual length.