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Abstract

Semi-variograms are a unique tool for the characterisation of spatial patterns from remotely sensed data. By means of the range and the sill, the distance of spatial dependency between neighbouring samples and their general level of variability can be investigated for varying directions. Both sets of information are potentially useful for an improved parameterisation of surface processes in climate models as well as for any study dealing with the spatial organisation of the environment. Algorithms have been developed for the automatic retrieval of semi-variograms from large sets of AVHRR data, including checks on cloud contamination as well as the significance of the retrieved semi-variances. A modelling routine further allows for the rapid extraction of the range and the sill from the retrieved semi-variograms. The analysis of the temporal evolution of the spatial characteristics for an extended region in western Africa shows clear differences between different surface parameters and different regions.

Additional information

Authors: VOGT J V, JRC Ispra (IT);VERSTRAETE M M, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 6th European AVHRR Data Users' Meeting, Belgirate (IT), June 28 - July 2, 1993
Availability: Available from (1) as Paper EN 37720 ORA
Record Number: 199311574 / Last updated on: 1994-11-28
Category: PUBLICATION
Original language: en
Available languages: en
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