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A methodology is proposed for a post-processing assessment of the performance of training set selections and classification procedures. This paper focuses on the necessity and usefulness of a critical validation of classification results. A statistical procedure is proposed to evaluate the algorithms for the numerical classification of images. The approach is based on the derivation of performance indicators from measurements of signature separability and thresholding analysis. Although these measurements are not new in image processing techniques, they are used in this study in an original way for the comparison of outputs resulting from different classification criteria. The theoretical description of the suggested method is followed by their practical application to a case-study for mapping crop coefficients in an irrigation district.

In het kort worden werktuigen behandeld, waarmee kleine kluiten en gewasresten op het land achter worden gelaten met het doel verstuiving van lichte gronden tegen te gaan. De daarbij gebruikte zaaimachines worden eveneens belicht

Eén van de aanwezige silo's op het Proefstation te Rosmalen is aangepast om de ontwijkende gassen op te vangen. In de periode juni t/m september is bijna 2300 m3 biogas afgetapt.