Collocation Product Empty

snap
1 
def collocate_products(product, reference_product):
    """Collinearate product to reference product"""
    # Op name: org.esa.snap.collocation.CollocateOp
    # Op alias: Collocate
    # sourceProductPaths or None
    # referenceProductName or referenceProductName
    # targetProductName or None
    # targetProductType or None
    # copySecondaryMetadata or None
    # renameReferenceComponents or None
    # renameSecondaryComponents or None
    # referenceComponentPattern or None
    # secondaryComponentPattern or None
    # resamplingType or None

    print("\tCollocating product...")
    parameters = HashMap()
    
    from esa_snappy import jpy
    
    parameters = HashMap()
    parameters.put('referenceProductName', reference_product.getName())
    parameters.put('targetProductType', 'COLLOCATED')
    parameters.put('renameReferenceComponents', True)
    parameters.put('renameSecondaryComponents', True)
    parameters.put('resamplingType', 'NEAREST_NEIGHBOUR')
    
    # Pass products directly to GPF.createProduct
    collocated_product = GPF.createProduct('Collocate', parameters, 
                                          [reference_product, product])

    return collocated_product

some references used:

renamed master/slave to reference/secondary, resolved SNAP-3660 · senbox-org/snap-gpt-tests@722eaf5 · GitHub and
Collocation operator on Python and
snap-engine/snap-collocation/src/main/java/org/esa/snap/collocation/CollocateOp.java at 134f4b3f35278f22a3535ef349f0ee47ab4241db · senbox-org/snap-engine · GitHub

I am trying to collocate a single product to a single reference product but the output seems to be empty when viewed on the SNAP GUI. Is this the correct method to use the collocate operator in SNAP 11?

3

@TomBlock , @dolaf can you help?