Hello Marc,
I have used HEG tool to convert *.hdf files to *.geotiff. I found it
very easy here is the link
http://hdfeos.org/software/heg.php/
though, you can also use FWTools. Here is the example how to do that in
FWTool which is link of earlier conversation on the same topic.
http://r-sig-geo.2731867.n2.nabble.com/Antw-Antw-Re-HDF-format-td7236416.html#a7237481,
see the last conversation in the list.
HTH,
Cheers,
Vikram.
On 7/6/2012 12:39 PM, Matthew Landis wrote:
Marc,
It's been a long time since I worked with HDF, so someone out there
will likely have better suggestions. But I think you will want to get
that out of HDF format as fast as possible. Try using hdp
(http://www.hdfgroup.org/hdp.html) to dump the file to a binary or
ascii file and then you should be able to read that in to R using
readBin or read.delim or such.
There are also hdf viewers at the HDFGroup site that should help you
to see what the file looks like, figure out the grid, etc.
M
On 7/6/2012 5:32 AM, Marc Marí Dell'Olmo wrote:
Hello,
I'm trying to open and work with a map I have downloaded from
http://glovis.usgs.gov/, obtained from MODIS Terra satellite. This web
only allows to download maps in .hdf format. I do not have ArcView, a
GIS
programme which opens these maps without any problem. I have been
trying to
do it using "R", however, I have not succeeded... First, I converted
the map
- which is in version 4 - to version 5 (with h4h5tools
http://www.hdfgroup.org/h4toh5). I have tried to open it with satinGet
(library satin) but I have obtained this error message:
Error en queryname(nom.hdf5, what = "date") :
objeto 'date.str' no encontrado
Finally I managed to open the file using the function hdf5load (library
hdf5). With this function I have obtained two objects "HDF4_DIMGROUP" ,
"MOD44B_250m_GRID" but I don't know how can I represent spatially the
data.
I think I have a grid with the values of the variables but I don't
know the
reference of the coordinates (UTM long lat), the distance between the
points
of the grid, etc... In general, I don't know how to work with the
information...
I'm using Windows.
Here is the link of the original map, in case it helps.
http://dl.dropbox.com/u/22891835/MOD13Q1NDVI_2012Maig.hdf
Thanks in advance for the help!
Marc
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