Vine Signal Extraction – an Application of Remote Sensing in Precision Viticulture

  • J.L. Smit Geomatics Division, School of Architecture, Planning and Geomatics, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
  • G. Sithole Geomatics Division, School of Architecture, Planning and Geomatics, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
  • A.E. Strever Department of Viticulture and Oenology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa

Abstract

This paper presents a study of precision agriculture in the wine industry. While precision viticulture mostly aims
to maximise yields by delivering the right inputs to appropriate places on a farm in the correct doses and at the
right time, the objective of this study was rather to assess vine biomass differences. The solution proposed in this
paper uses aerial imagery as the primary source of data for vine analysis. The first objective to be achieved by the
solution is to automatically identify vineyards blocks, vine rows, and individual vines within rows. This is made
possible through a series of enhancements and hierarchical segmentations of the aerial images. The second objective
is to determine the correlation of image data with the biophysical data (yield and pruning mass) of each vine.
A multispectral aerial image is used to compute vegetation indices, which serve as indicators of biophysical measures.
The results of the automatic detection are compared against a test field, to verify both vine location and vegetation
index correlation with relevant vine parameters. The advantage of this technique is that it functions in environments
where active cover crop growth between vines is evident and where variable vine canopy conditions are present
within a vineyard block.
Published
2016-12-12
Section
Articles