I´ve been following this forum for quite a while but now it´s time for my first question:
I try to set up a processing chain within python / snappy and the first step (calibration) - which is calculated from the .SAFE files - is no problem.
scene_calib = GPF.createProduct(“Calibration”, parameters, scene)
ProductIO.writeProduct(scene_calib, path_out + “\” + filename[:-5] + “_cal”, ‘BEAM-DIMAP’)
In the second step I try to use the output of the calibration - which is a .dim file - and apply TOPS-Deburst
parameters = HashMap() parameters.put("selectedPolarisations", "VV") scene_name = path_out + "\\" + filename[:-5] + "_cal" + ".dim" scene = ProductIO.readProduct(scene_name) scene_deb = GPF.createProduct("TOPSAR-Deburst", parameters, scene) ProductIO.writeProduct(scene_deb, scene_name[:-4] + "_deb", "BEAM-DIMAP")
If I run the TOPS-Deburst also with a .SAFE file (instead of calibration) it works. But if I use the .dim, I get the following error:
Traceback (most recent call last): File "C:\Python34\lib\site-packages\IPython\core\interactiveshell.py", line 2847, in run_code exec(code_obj, self.user_global_ns, self.user_ns) File "<ipython-input-10-f92f2d6b5c81>", line 1, in <module> scene_deb = GPF.createProduct("TOPSAR-Deburst", parameters, scene) RuntimeError: org.esa.snap.core.gpf.OperatorException: java.lang.NullPointerException java.lang.NullPointerException
I´m really new to Python and also new to SAR processing, so it might just be some rookie mistake, but I´m quite puzzled at the moment.