Evaluation of the controls affecting the quality of spatial data derived from historical aerial photographs

Auteur(s) et Affiliation(s)

WALSTRA, J.

Dep. of Languages and Cultures of the Near East and North Africa, Univ., Ghent, Belgique

CHANDLER, J.H.

Dep. of Civil and Building Engineering, Univ., Loughborough, Royaume-Uni

WACKROW, R.

Dep. of Civil and Building Engineering, Univ., Loughborough, Royaume-Uni

Description :
Data-sets from 2 case-studies provided a variety of source data and hence a good opportunity to evaluate the influence of the quality of archival material on the accuracy of coordinated points. Based on the statistical weights assigned to the measurements, precision of the data was estimated a priori, while residuals of independent checkpoints provided an a posteriori measure of data accuracy. Systematic discrepancies between the two values indicated that the routinely used stochastic model was incorrect and overoptimistic. It is showed that the random errors not only appeared to be much larger than values accepted for appropriately controlled and targeted photogrammetric networks, but also small undetected gross errors were induced through the ‘misidentification’ of points. Using optimized weighting factors is therefore suggested.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 7, p. 853-863, nombre de pages : 11, Références bibliographiques : 36 ref.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais