For now, here’s the zip file with R scripts: hacc-spatial.zip.
From the thesis abstract:
The second task is concerned with management zone delineation. Based on a literature
review of existing approaches, a lack of exploratory algorithms for this task is concluded, in
both the precision agriculture and the computer science domains. Hence, a novel algorithm
(HACC-spatial) is developed, fulfilling the requirements posed in the literature. It is based
on hierarchical agglomerative clustering incorporating a spatial constraint. The spatial
contiguity of the management zones is the key parameter in this approach. Furthermore,
hierarchical clustering offers a simple and appealing way to explore the data sets under
study, which is one of the main goals of data mining.
The thesis itself can be found here: PhD thesis (32MB pdf), the algorithm is described on pdf page 124 (print page 114): hacc-spatial-algorithm.pdf.
Further explanations and shorter descriptions are to be found in two publications, available in fulltext: Exploratory Hierarchical Clustering for Management Zone Delineation in Precision Agriculture and Machine Learning Methods for Spatial Clustering on Precision Agriculture Data.
Let me know if there are questions, comments or even successful results when applying the algorithm to your data sets.
There are also two youtube videos of the clustering (with an additional pre-clustering step, the „inital phase“): F440-REIP32-movie.avi and F611-REIP32-movie.avi. It’s probably the end of both videos where it gets interesting. Compare the plots for the REIP32 variable of the F440 and F611 data sets (F440: PhD pdf page 185 (clustering on page 138) and F611: PhD pdf page 195).
Important points
Apart from that, there’s not much to comment (yet). Let me know about questions or issues and I may be able to fix them or list further requirements here.
mail: researchblog@georgruss.ch
]]>Die Dissertation ist jetzt bei der Bibliothek publiziert und auch hier online zu finden: http://blog.georgruss.de/?page_id=358
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Three things made me want root access:
After I had root access, I used Ghost Commander because it can simply mount/unmount /system rw/ro. I could have done that via console, but it’s much more convenient that way.
]]>(this merits a new category at the top level)
]]>Mit dem offiziellen Datum vom 23.11.2011 habe ich heute meine Dissertation eingereicht. Jetzt ist der Fakultätsrat dran, dann sind es die Gutachter und wenn alles glatt läuft, bin ich bei der Verteidigung dran. Vorbehaltlich der Genehmigung durch den Fakultätsrat findet die Verteidigung am 23.02.2011, 15 Uhr, in 29-301 statt. Der Dissertationstitel entspricht der Überschrift dieses Blogs.
Fürs Binden habe ich übrigens 42 EUR bezahlt. Das kann doch kein Zufall sein!
]]>Here’s the script: minihomertool, version 2011-09-24
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