Rolf Fankhauser
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Activity overview
Latest activity by Rolf Fankhauser-
Rolf Fankhauser commented,
Diversity is used in two other modules: PATTERN and TEXTURE In PATTERN documentation there is the following definition b) Diversity H = -sum(p*ln(p)) where sum = the sum over all classes in the ent...
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Rolf Fankhauser created a post,
How is diversity calculated as output of EXTRACT?
I run EXTRACT with the option "All listed summary types". In the tabular output there is a column "Diversity". I didn't find in the documentation how this quantity is calculated and how to interpre...
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Rolf Fankhauser commented,
Yes, but I need for each land cover type a SQL statement: = 1 where landcover = "tree" = 2 where landcover = "acre" = 3 where landcover = "grass" etc. and you have to know which text field values a...
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Rolf Fankhauser commented,
I don't think that's possible with one SQL statement. Idr_id type_as_text1 tree2 acre3 grass4 tree5 grass6 grass7 acre8 tree Result should be: 1 12 23 34 15 36 37 28 1 where tree=1, acre=2, grass=3...
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Rolf Fankhauser commented,
I solved it in R: I exported the table as csv, read it in R, created the index of the strings and outputted the idr_id and index as AVL file. So, I can generate the raster file with ASSIGN from the...
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Rolf Fankhauser created a post,
how to create number field from string field in Database Workshop
Hi, I imported a shapefile. There is a string field describing the land use. Now I would like to create an integer field which corresponds to the strings of land use. Last time I did it for each la...
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Rolf Fankhauser commented,
Hi James, Thanks for your answer. I have an aerial image with little noise I guess. In the meantime I made a PCA and used the first and second component for a ML classification. The results are bet...
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Rolf Fankhauser created a post,
color palette for SCATTER
Hi all, I use SCATTER to analyze my training sets. If I use "pixel counts" the color palette is stretched from 0 to max numbers of pixels. But I would like to have zero pixels in white and more tha...
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Rolf Fankhauser created a post,
preprocessing for maximum likelihood classification?
Hi all, I wonder if preprocessing of data like contrast stretching or pca improve the quality of classification. pca can save processing time to reduce the number of bands but is it useful when I h...
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Rolf Fankhauser commented,
Ok, I found a workaround. I expanded the images to 10cm and contracted them to 20cm. Regards, Rolf