I'm using randomForest in yaImpute to create a yai-type object which
associates "L" with landscape features. Then I use the sp() package to
impute L to a landscape consisting of four ascii files) I keep getting the
message "NA's generated due to illegal level(s)" when I do the
imputation.
It's probably because one of the landscape features ("as", for
aspect/slope) is stored in numeric form but is treated as a factor when
the yai object is created. "as" is also stored in numeric form in the
ascii grids, of course. I included an "xtypes" argument in the
AsciiGridImpute statement, but that did
not help. Some relevant statements are:
xfiles <- list(DEM_10 = "dem_10.asc", EASTING =
"easting.asc",
NORTHING = "northing.asc", as = "asp_slop.asc")
AsciiGridImpute(yai_ob, xfiles, outfiles,
xtypes=list("numeric", "numeric",
"integer", "character"))
Any insights will be appreciated. I'd particularly like to know how to
gain access to the "invisible" list, VALUE, containing
unexpectedNA's,
illegal levels, and other information that would help me to troubleshoot
the issue.
Dr. Seth W. Bigelow
Biologist, USDA-FS Sierra Nevada Research Center
1731 Research Park Drive, Davis California
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