Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
On 5/3/13 5:41 AM, "Swagath Navin" <swagathnavin82 at gmail.com> wrote:
>Hello all,
>
>I am new to rgdal. I downloaded a tif file from
>'http://mrdata.usgs.gov/radiometric/data/NArad_U_geog83.tif' which i
>would like to convert into a regular data frame so that i can plot it
>using ggplot2.
>
>when i tried to read the file using readGDAL i get a warning message
>
>NArad_U_geog83.tif has GDAL driver GTiff
>and has 2432 rows and 5868 columns
>Warning message:
>In readGDAL("NArad_U_geog83.tif") : GeoTransform values not available
>
>What does it mean?
>
>Here s the summary of the file:
>
>Object of class SpatialGridDataFrame
>Coordinates:
> min max
>x 0 5868
>y 0 2432
>Is projected: NA
>proj4string : [NA]
>Grid attributes:
> cellcentre.offset cellsize cells.dim
>x 0.5 1 5868
>y 0.5 1 2432
>Data attributes:
> band1 band2 band3
> Min. : 0.0 Min. : 0.0 Min. : 0
> 1st Qu.:255.0 1st Qu.:255.0 1st Qu.:255
> Median :255.0 Median :255.0 Median :255
> Mean :222.4 Mean :231.1 Mean :226
> 3rd Qu.:255.0 3rd Qu.:255.0 3rd Qu.:255
> Max. :255.0 Max. :255.0 Max. :255
>
>Can anyone please tell me which packages i should look into for
>converting it into a data frame so that i can plot it using ggplot2.
>
>Thanks,
>Swagath
>
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