Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Digitising and georeferencing of old terrestrial metric photography of glaciers

Glaciers have been documented since 1870’s by means of terrestrial photography. The cameras used for photography have been metric cameras, and control point networks have been established and targeted in the area before photography. As photographs are originally made for surveying purpose, they can be considered as primary geographic data.

In general, old photographs build early and reliable reference for later monitoring tasks. However, the potential value of this data depends entirely on its usability. The oldest records are on glass plates and are as such not useful at all. In order to become compared with new data, photographs have to be transformed to a known geodetic reference system, most usually to a 3D coordinate system.

This result aims to digitise analogue geographic records and to determine their georeference. The photogrammetry procedure consists of:
- Digitising of glass plates,

- Measuring of tie points between photographs and measuring of geodetic control points, which are identified in images,

- Block adjustment, in order to determine parameter values of georeference for each image.

Once photographs are processed by photogrammetric means, they can be considered as geographic information. They can be used for producing and analysing of secondary geographic data.

Reported by

Helsinki University of Technology
Otakaari 1
02015 Helsinki
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