Reading Sentinel 1 SLC band data in SM mode

[sunagpavan]

Hello all,
I am trying to read real and imaginary bands of SLC data using .readPixels().
But I am getting this RuntimeError: no matching Java method overloads found. This was working fine for GRD data and I am not sure if this is the right way to read real and imaginary bands of SLC data.

snippet from my code:
realBand = p.getBand(‘i_VH’)
real_chip = np.zeros(32 * 32, np.int16)
realBand.readPixels(0, 0, 32, 32, real_chip)
real_chip.shape = 32, 32

Please guide me through this.

Thank you

[marpet]

I also see no issue with the code snippet.
You can try to enable the debug mode. How to do it I’ve explained here:

Memory issues with Snappy

I’ve no idea why this happens. Maybe the following helps to find out what is going on. You can enable the debug mode in the snappy. ini file. Change debug to true. debug: True Now you should get some log output which might help already. If you want to get more log output you can edit the _init_.py jpy.diag.flags = jpy.diag.F_ALL

[sunagpavan]

Thanks for the reply. I will try to do debug

[sunagpavan]

I tried editing the snappy.ini file and init.py file. I could not find the log file, is there a root folder where it saves?

[marpet]

If I remember correctly, the log is only written to the console and not to a file

[sunagpavan]

Hello marpet,

following is being printed in the console when i am making debug true. But i still cannot figure out the issue. please let me know what other API’s that can be used to read the band pixel data ?

JPy_GetJNIEnv: jenv=000001B155D2D9F8
JOverloadedMethod_FindMethod: argCount=6, visitSuperClass=1
Py_TYPE(pyArgs[0])->tp_name = org.esa.snap.core.datamodel.Band
Py_TYPE(pyArgs[1])->tp_name = int
Py_TYPE(pyArgs[2])->tp_name = int
Py_TYPE(pyArgs[3])->tp_name = int
Py_TYPE(pyArgs[4])->tp_name = int
Py_TYPE(pyArgs[5])->tp_name = numpy.ndarray
JOverloadedMethod_FindMethod0: method ‘org.esa.snap.core.datamodel.Band#readPixels’: overloadCount=6
JMethod_MatchPyArgs: argument count mismatch (matchValue=0)
JOverloadedMethod_FindMethod0: methodList[0]: paramCount=6, matchValue=0
JMethod_MatchPyArgs: argument count mismatch (matchValue=0)
JOverloadedMethod_FindMethod0: methodList[1]: paramCount=6, matchValue=0
JMethod_MatchPyArgs: argument count mismatch (matchValue=0)
JOverloadedMethod_FindMethod0: methodList[2]: paramCount=6, matchValue=0
JMethod_MatchPyArgs: pyArgs[1]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[2]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[3]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[4]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[5]: paramDescriptor->type->javaName=’[D’, matchValue=0
JOverloadedMethod_FindMethod0: methodList[3]: paramCount=5, matchValue=0
JMethod_MatchPyArgs: pyArgs[1]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[2]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[3]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[4]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[5]: paramDescriptor->type->javaName=’[F’, matchValue=0
JOverloadedMethod_FindMethod0: methodList[4]: paramCount=5, matchValue=0
JMethod_MatchPyArgs: pyArgs[1]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[2]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[3]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[4]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[5]: paramDescriptor->type->javaName=’[I’, matchValue=0 JOverloadedMethod_FindMethod0: methodList[5]: paramCount=5, matchValue=0
JOverloadedMethod_FindMethod0: method ‘org.esa.snap.core.datamodel.AbstractBand#readPixels’: overloadCount=6
JMethod_MatchPyArgs: argument count mismatch (matchValue=0)
JOverloadedMethod_FindMethod0: methodList[0]: paramCount=6, matchValue=0
JMethod_MatchPyArgs: argument count mismatch (matchValue=0)
JOverloadedMethod_FindMethod0: methodList[1]: paramCount=6, matchValue=0
JMethod_MatchPyArgs: argument count mismatch (matchValue=0)
JOverloadedMethod_FindMethod0: methodList[2]: paramCount=6, matchValue=0
JMethod_MatchPyArgs: pyArgs[1]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[2]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[3]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[4]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[5]: paramDescriptor->type->javaName=’[D’, matchValue=0
JOverloadedMethod_FindMethod0: methodList[3]: paramCount=5, matchValue=0
JMethod_MatchPyArgs: pyArgs[1]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[2]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[3]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[4]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[5]: paramDescriptor->type->javaName=’[F’, matchValue=0
JOverloadedMethod_FindMethod0: methodList[4]: paramCount=5, matchValue=0
JMethod_MatchPyArgs: pyArgs[1]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[2]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[3]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[4]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[5]: paramDescriptor->type->javaName=’[I’, matchValue=0 JOverloadedMethod_FindMethod0: methodList[5]: paramCount=5, matchValue=0
JOverloadedMethod_FindMethod0: method ‘org.esa.snap.core.datamodel.RasterDataNode#readPixels’: overloadCount=6
JMethod_MatchPyArgs: pyArgs[1]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[2]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[3]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[4]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[5]: paramDescriptor->type->javaName=’[D’, matchValue=0
JOverloadedMethod_FindMethod0: methodList[0]: paramCount=5, matchValue=0
JMethod_MatchPyArgs: argument count mismatch (matchValue=0)
JOverloadedMethod_FindMethod0: methodList[1]: paramCount=6, matchValue=0
JMethod_MatchPyArgs: pyArgs[1]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[2]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[3]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[4]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[5]: paramDescriptor->type->javaName=’[F’, matchValue=0
JOverloadedMethod_FindMethod0: methodList[2]: paramCount=5, matchValue=0
JMethod_MatchPyArgs: pyArgs[1]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[2]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[3]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[4]: paramDescriptor->type->javaName=‘int’, matchValue=100
JMethod_MatchPyArgs: pyArgs[5]: paramDescriptor->type->javaName=’[I’, matchValue=0 JOverloadedMethod_FindMethod0: methodList[3]: paramCount=5, matchValue=0
JMethod_MatchPyArgs: argument count mismatch (matchValue=0)
JOverloadedMethod_FindMethod0: methodList[4]: paramCount=6, matchValue=0
JMethod_MatchPyArgs: argument count mismatch (matchValue=0)
JOverloadedMethod_FindMethod0: methodList[5]: paramCount=6, matchValue=0
Traceback (most recent call last):
File “I:/Desktop/DLR/Practice/Work_dlr/slcdata_test.py”, line 66, in
main()
File “I:/Desktop/DLR/Practice/Work_dlr/slcdata_test.py”, line 33, in main
realBand.readPixels(0, 0, chip_width, chip_height, real_chip)
RuntimeError: no matching Java method overloads found