issue when opening raster image in R, the pixel values a rescaled somehow
Please put the original file on the link too, so that we can track where the misconfiguration occurs, and provide more of the workflow code. I think we'll also need sessionInfo() output and GDAL version, both as seen by gdalUtils, raster and rgdal. Roger
On Tue, 24 Mar 2020, Victor F. Rodriguez Galiano wrote:
Hi Roger, the link to he image is given below. This image was generated from a .hdf file using the function gdal_translate. gdal_translate(sds[1], dst_dataset=paste0(substr(filename, 1, nchar(filename)-4) ,".tif", )) https://wetransfer.com/downloads/4569e9a85c02faad5016b83d0b50217820200324084015/f2eafdfafaae74de9ac8e25017fc5cc520200324084015/e46e80 Thanks Victor El lun., 23 mar. 2020 a las 21:07, Roger Bivand (<Roger.Bivand at nhh.no>) escribi?:
Please make the file in question available for download (url), or the url
you downloaded it from (no login), on this list. It looks as though the
unsigned 16 bit integer is not right.
Roger Bivand
Norwegian School of Economics
Bergen, Norway
------------------------------
*Fra:* R-sig-Geo <r-sig-geo-bounces at r-project.org> p? vegne av Victor F.
Rodriguez Galiano <vrgaliano at gmail.com>
*Sendt:* mandag 23. mars 2020, 21.02
*Til:* r-sig-geo at r-project.org
*Emne:* [R-sig-Geo] issue when opening raster image in R, the pixel
values a rescaled somehow
I opened a Geotiff image in R using the raster function. However, the
image seems to be rescaled. The minimum and maximum values should be 13607
and 15461 but are 275 and 305. The Geotiff image when opened in a GIS is
correct but not in R. This is my code: Script: library(raster)
trial<-raster("MOD11A2.A2000049.h17v05.006.2015058135048.tif", datatype =
"INT2U") trial plot(trial) [[alternative HTML version deleted]]
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Roger Bivand Department of Economics, Norwegian School of Economics, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; e-mail: Roger.Bivand at nhh.no https://orcid.org/0000-0003-2392-6140 https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en