Writing product problem with ProductIO.writeProduct

development
#1

The problem I am facing is part of more complex workflow, but I believe that it could be simplified to this simple case. I have a tif image file and I am reading it from disk to Product like this:

java.io.File file = new java.io.File(outFilePath);
Product inProduct = CommonReaders.readProduct(file);

The inProduct variable seems fine, it has band, dimensions and so. Now I just try to save it to other location on disk like this:

ProductIO.writeProduct(inProduct, "d:\\desktop\\test.tif", "GeoTIFF");

The resulting file is created, it has correct dimensions, resolution, but it has no data, it is all zeros. What am I doing wrong?

#2

I just did the same and the resulting file is okay.
I just used ProductIO instead of CommonReaders, but this should not make a difference.
Which version of SNAP do you use?

        File file = new File("H:\\geotiff\\LzwGeotiff_issue\\AL01_AV2_OBS_1C_20080715T181736_20080715T181748_ESR_013182_3985.TIF");
        Product inProduct = ProductIO.readProduct(file);
        ProductIO.writeProduct(inProduct, "H:\\_temp\\test.tif", "GeoTIFF");
#3

Thank you. I have snap 8.0. But I have already came to conclusion, that the code is OK.
The problem is with that tif file. I have created it with gdal module in Python. In ArcMap it has correct values, but in Snap it is all zeros. I guess I am missing something in that raster creation process, but have no clue what. Don’t you have some tip what may be the problem?

#4

What’s the data type and the value range of the data?
Can you provide the file?

#5

I found it. I have created output raster for writing tif in python like this:
out_ds = driver.Create(out_file, cols, rows, 1, gdal.CGDT_Float32)
The issue was that it was complex number not floating point. This way it worked:
out_ds = driver.Create(out_file, cols, rows, 1, gdal.GDT_Float32)
Thank you.

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