[R-sig-Geo] HDF-EOS Level 2B point model and rgdal/gdal

[Mark Connolly]

I may not have asked that question very well.  The HDF-EOS Level 2b is 
an hdf4 file that contains point data and has a structure that is quite 
different from the Level 3 (which I have been able to bring in as a 
raster after using HEG to pull a specific object from the file).

If anyone else has the same need, the contents can be pulled out of the 
point file using the hdp hdf dumper from the HDF Group 
(http://www.hdfgroup.org/hdp.html).

In my case, I wanted a subset of the fields from a specific vdata node 
in the hdf structure.  The command line I ended up with was

hdp dumpvd -o AMSR_E_L2_Land_V09_200206190754_A.txt -d -i 1 -f 
Latitude,Longitude,Soil_Moisture AMSR_E_L2_Land_V09_200206190754_A.hdf

-o ... = output file name
-d = no headers
-i 1 = the index of the vdata
-f ... = the field names

The produced a file that can be read as a table in R.

http://hdfeos.org/software/tool.php#HEG
is appropriate for Level 3 HDF to GeoTIFF

http://www.hdfgroup.org/hdf-java-html/hdfview/
is good for exploring the file structure of many hdf forms


Maybe this will be useful for someone.

Mark



On 06/25/2010 12:43 PM, rick reeves wrote:
> Mark, have a look at:
>
> http://www.nceas.ucsb.edu/scicomp/usecases/ReadWriteESRIShapeFiles
>
> hope this helps,
> Rick Reeves
>
> On 6/25/2010 9:40 AM, Mark Connolly wrote:
>> I am trying to load point data into R, but am having no luck.  Does 
>> rgdal support these data sets?
>>
>> Thanks,
>>
>> Mark Connolly
>> Master of Science Program
>> Department of Soil Science
>> North Carolina State University
>> PO Box 7619
>> Raleigh, North Carolina 27695-7619
>>
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>
>