GPF.createProduct error in google colab

snap
#1

Hi,
I tried these to for orthorectifing images using python on googlecolab;

parameters = HashMap()
GPF.getDefaultInstance().getOperatorSpiRegistry().loadOperatorSpis()
parameters.put(‘orbitType’, ‘Sentinel Precise (Auto Download)’)
parameters.put(‘polyDegree’, ‘3’)
parameters.put(‘continueOnFail’, ‘false’)
apply_orbit_file = GPF.createProduct(“Apply-Orbit-File”, parameters, product)

But, I got this error;
RuntimeError: org.esa.snap.core.gpf.OperatorException: java.lang.NullPointerException

I cannot figure it out what the problem is. Thank you for your help.

#2

This is unfortunately one issue of snappy the error reporting is not good.
By only seeing this message it is hard to tell what the error is.
Possible reasons:

  • Download of the orbit file does not work. Maybe not yet available or data can’t be stored on gogglecolab
  • Was the product correctly read?

If you have the option, you could try this locally on your machine with your data.

#3

Thanks a lot for the reply. I tried GPF.createProduct with other values such as “Calibration”, and I got the same error.
I ran these codes;
product = ProductIO.readProduct(“S1A_IW_GRDH_1SDV_20210419T230833_20210419T230858_037526_046CC6_DCC5_Orb.dim”)
width = product.getSceneRasterWidth()
print(“Width: {} px”.format(width))
height = product.getSceneRasterHeight()
print(“Height: {} px”.format(height))
name = product.getName()
print(“Name: {}”.format(name))
band_names = product.getBandNames()
print(“Band names: {}”.format(", ".join(band_names)))

and I got these;
Width: 25868 px
Height: 16409 px
Name: S1A_IW_GRDH_1SDV_20210419T230833_20210419T230858_037526_046CC6_DCC5_Orb
Band names: Amplitude_VH, Intensity_VH, Amplitude_VV, Intensity_VV

Apparently, the product was read correctly, am I right?

#4

Yes, the product looks good.

#5

I figured out what the problem was. When I used a .zip product instead of a .dim product, I did not get that error.
Thank you again.

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#6

Ah! Maybe some of the metadata is not accessible anymore when converted to DIMAP.

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