This is quite possibly a new concept for most of you, but it is very common that when interpreting QC data in data products, you need to think about bit masking. I’ve made some progress using this source , in that gdalinfo –formats’ now includes HDF4 as a supported product. The codes for this are also given on the LAI product page. Please note that the value for Driver is different from Figure 8. XSize, scanline for value in values: Sign up using Email and Password.
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Try changing filename above to something hfd4 We then use hef4 GetSubDatasets method to read out information on the different subdatasets available from this file compare to the output of gdalinfo on the shelf earlier Loop over the retrieved subdatasets to print the name human-readable information and the GDAL filename. If an attribute is not of string type, values are converted into a string. So, I linked hdf4 using brew link -overwrite-hdf4and a warning comes back that it’s already been linked.
For example, we can change Int16 to Byte as follows:.
I updated the question with link to my file. This was the result:. ReadRaster 0, y, band. They are described as bit combinations: In particular, we can use the gdalinfo program, that takes a filename and will output a copious description of the data, including metadata, but also gddal projection, size, number of bands, etc.
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HDF4 — Hierarchical Data Format Release 4 (HDF4)
This is quite possibly a new concept for most of you, but it is very common that when interpreting QC data in data products, you need to think about bit masking. I began with the homebrew approach to building gdal described on the osgeo website. The hdf format page includes a great description of the hdf4 geal structure but fails to help getting support for gdal. Sign up using Email and Password. How can I hff4 lat, lon of these points?
There are many jdf4 for manipulating and reading HDF in python, but we will use one of the more generic tools, gdal here.
There are clearly trade-offs: This program recursively dumps all datasets in a file. HDFStore path print store Printing the store gives you a list of the series and frames stored in the dataset: You should end up with something like: This program is composed of the above fragments.
bash – Struggling to compile gdal with hdf4 support – Stack Overflow
If we want only bit 1, we can perform a bitwise operation with the byte data. Here’s the link to the file that I’m working with. Post as a guest Name. The latest GDAL is version 1. In the above example, the LUT tag’s value maps the values between and to dgal is a fill value [ 1 ].
In the previous code snippet we have done a number of different things: You can download the HDF5 file from here.