Sorry, I meant:
"I can try later today with Manifold System, which may be helpful as an
independent tool, maybe".
On Fri, Nov 5, 2010 at 11:14 AM, Michael Sumner <mdsum...@gmail.com> wrote:
> Ok, thanks. I can try later today with Manifold System, which may be. I'm
> not sure of other non-GDAL tools to double check TIFFs with. (ArcGIS 10 uses
> GDAL but I don't know to what extent).
>
> Is the output above what you expect, or what you get? That's what I get.
> Sorry to be dim, but I don't see where you've specified what's actually
> wrong (and I haven't explored enough to see if that's easy to determine from
> the code).
>
> That's a cunning use of formals() to change defaults for a function - a bit
> radical for my taste, but I like it.
>
> Cheers, Mike.
>
> On Fri, Nov 5, 2010 at 11:00 AM, Oliver Soong
> <osoon...@gmail.com<osoong%...@gmail.com>
> > wrote:
>
>> Here's an example:
>>
>>
>>
>>
>> require(rgdal)
>> formals(paste)$sep <- ""
>>
>> SP27GTIF <- readGDAL(
>> system.file("pictures/SP27GTIF.TIF", package = "rgdal")[1],
>> output.dim=c(100,100)
>> )
>> img_1bit_1band <- SP27GTIF
>> img_1bit_1b...@data$band1 <- as.integer(sp27g...@data$band1 > 85)
>> img_1bit_2band <- SP27GTIF
>> img_1bit_2b...@data <- data.frame(
>> band1 = img_1bit_1b...@data$band1,
>> band2 = as.integer(sp27g...@data$band1 > 170)
>> )
>>
>> for(img in c("img_1bit_1band", "img_1bit_2band")) {
>> cat(paste("*** Correct Stats: ", img, "\n"))
>> print(sapply(get(img)@data, table))
>> for(compress in c("NONE", "DEFLATE", "LZW", "CCITTRLE",
>> "CCITTFAX3", "CCITTFAX4")) {
>> file <- paste(img, "_", compress, ".tif")
>> writeGDAL(get(img), file, type = "Byte",
>> options = c("NBITS=1", paste("COMPRESS=", compress)))
>> cat(paste("Compression: ", compress, " from ", file, "\n"))
>> reread <- readGDAL(file, silent = TRUE)
>> print(sapply(rer...@data, table))
>> }
>> cat("\n")
>> }
>>
>>
>>
>>
>>
>> The expected output is:
>>
>> *** Correct Stats: img_1bit_1band
>> band1
>> 0 3086
>> 1 6914
>> Compression: NONE from img_1bit_1band_NONE.tif
>> band1
>> 0 3086
>> 1 6914
>> Compression: DEFLATE from img_1bit_1band_DEFLATE.tif
>> band1
>> 0 3086
>> 1 6914
>> Compression: LZW from img_1bit_1band_LZW.tif
>> band1
>> 0 3086
>> 1 6914
>> Compression: CCITTRLE from img_1bit_1band_CCITTRLE.tif
>> band1
>> 0 3086
>> 1 6914
>> Compression: CCITTFAX3 from img_1bit_1band_CCITTFAX3.tif
>> band1
>> 0 3086
>> 1 6914
>> Compression: CCITTFAX4 from img_1bit_1band_CCITTFAX4.tif
>> band1
>> 0 3086
>> 1 6914
>>
>> *** Correct Stats: img_1bit_2band
>> band1 band2
>> 0 3086 8353
>> 1 6914 1647
>> Compression: NONE from img_1bit_2band_NONE.tif
>> band1 band2
>> 0 3086 8353
>> 1 6914 1647
>> Compression: DEFLATE from img_1bit_2band_DEFLATE.tif
>> band1 band2
>> 0 3086 8353
>> 1 6914 1647
>> Compression: LZW from img_1bit_2band_LZW.tif
>> band1 band2
>> 0 3086 8353
>> 1 6914 1647
>> Compression: CCITTRLE from img_1bit_2band_CCITTRLE.tif
>> band1 band2
>> 0 6131 8783
>> 1 3869 1217
>> Compression: CCITTFAX3 from img_1bit_2band_CCITTFAX3.tif
>> band1 band2
>> 0 6131 8783
>> 1 3869 1217
>> Compression: CCITTFAX4 from img_1bit_2band_CCITTFAX4.tif
>> band1 band2
>> 0 6131 8783
>> 1 3869 1217
>>
>>
>>
>> Everything looks fine except CCITT compression with 2 bands.
>>
>> I wasn't able to dig up Windows GDAL 1.7.1 binaries, and the 1.7.0
>> binaries from FW_Tools seem to give similar behavior, although it's a
>> little hard to check because neither ArcGIS nor ENVI seems to like any
>> of the multi-band files.
>>
>
>
>
> --
> Michael Sumner
> Institute for Marine and Antarctic Studies, University of Tasmania
> Hobart, Australia
> e-mail: mdsum...@gmail.com
>
--
Michael Sumner
Institute for Marine and Antarctic Studies, University of Tasmania
Hobart, Australia
e-mail: mdsum...@gmail.com
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