Rolf Fankhauser
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Recent activity by Rolf Fankhauser Sort by recent activity-
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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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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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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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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How to change resolution of an image with plane ref. system
Hello, I would like to change the pixel size of an orthophoto from 50cm to 20cm. I tried it with the PROJECT module but I get an error that there is no plane.ref file. The original image has a plan...
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pixelwise if then else
I would like to calculate image new from image1 and image2 as follows: if (image1.value = value1) then if (image2.value = value2) then new.value = value2 else new.value = value1 I don't know ...
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API function CallPick
I use the Idrisi API in a Delphi application. I saw that there is a function CallPick but found no documentation about it. I guess that this function shows the Pick List for some file types. I cou...
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How to export palettes
Hi all, Is it possible to export palettes (*.smp) in a readable form (ascii, csv, excel)? If not, I would like to make a small program in Delphi to output the palette as csv (Fields: Value, R, G, B...