Hello,
I have some doubts on the usage of some gdal tools.
After converting a hdf file to tif I want to reproject to SIRGAS2000 and
clip between lats of 22 to 29 S and lats of 40 to 50 W.
HDF file can be downloaded at
https://app.box.com/s/16cf7qv6af6gsz1v66staori2mtneu0r
Basically I'm following
https://scottishsnow.wordpress.com/2014/08/24/many-rastered-beast/
Well to convert HDF file I'm using:
gdal_translate("A20080012008031.L3m_MO_SST_4","georef.tif",sd_index=1,a_ullr=c(0,4320,8640,0),
a_srs="+proj=eqc +lat_ts=0 +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +a=6371007
+b=6371007 +units=m +no_defs")
Without a_ullr and a_srs options I was getting an error message when using
gdalwarp: "ERROR 1: Unable to compute a transformation between pixel/line
and georeferenced coordinates"
a_ullr and a_srs values I got with GDALinfo("georef.tif"). I also
tryed
a_ullr=c(-180,90,180,-90).
map <- raster("georef.tif")
plot(map)
My problem now is reproject to SIRGAS2000 and clip the image georef.tif:
gdalwarp("georef.tif", "georef2.tif",
s_srs="+proj=eqc +lat_ts=0 +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +a=6371007
+b=6371007 +units=m +no_defs",
t_srs="+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs")
map2 <- raster("georef2.tif")
plot(map2)
Map2 is not in SIRGAS2000 projection and clipping option
te=c(-50,-29,-40,-22) does not work.
Where is my mistake? I hope someone can tell me.
Thanks for any help.
Antonio Olinto
--
Ant?nio Olinto ?vila da Silva
Bi?logo / Ocean?grafo
Instituto de Pesca (Fisheries Institute)
S?o Paulo, Brasil
--
Ant?nio Olinto ?vila da Silva
Bi?logo / Ocean?grafo
Instituto de Pesca (Fisheries Institute)
S?o Paulo, Brasil
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