TOPSAR Interferometry sliceAssembly java.lang.NullPointerException

Microwave Toolbox Interferometry
#1

Hi, all!
I intended to using TOPSAR Slice Coreg Interferogram graph provided by SNAP6.0, however, an error was thrown out when I set ProductSet-Reader.

image.jpg1297×763 196 KB

The used graph is attached as follows:
ASC_InSAR_graph1_sliceAss_IW1_VV_bgd_ESD_Ifg_deb.xml (7.1 KB)

The Sentinel-1 data used are listed as follows:

ProductSet-Reader
S1A_IW_SLC__1SDV_20180402T102011_20180402T102038_021287_0249EB_F981.zip
S1A_IW_SLC__1SDV_20180402T102036_20180402T102103_021287_0249EB_DE2D.zip

ProductSet-Reader(2)

S1A_IW_SLC__1SDV_20180414T102011_20180414T102038_021462_024F5D_A487.zip
S1A_IW_SLC__1SDV_20180414T102036_20180414T102103_021462_024F5D_D7EF.zip

Is there anyone encountered this problem?
Thanks in advance!

#2

SliceAssembly process needs two inputs at the same date, so your two products.
To process interferometry you have to add another product on another date with the same extent.
I hope my answer will be helpful!

#3

ProductSet-Reader’s 2 products are on the same date:
S1A_IW_SLC__1SDV_20180402T102011_20180402T102038_021287_0249EB_F981.zip
S1A_IW_SLC__1SDV_20180402T102036_20180402T102103_021287_0249EB_DE2D.zip

ProductSet-Reader(2)'s 2 products are on the same date:
S1A_IW_SLC__1SDV_20180414T102011_20180414T102038_021462_024F5D_A487.zip
S1A_IW_SLC__1SDV_20180414T102036_20180414T102103_021462_024F5D_D7EF.zip

Did you mean this?

But when I use the following products, it works well. I don’t know the reason.
ProductSet-Reader
S1A_IW_SLC__1SDV_20170419T102005_20170419T102032_016212_01ACCA_F252.zip
S1A_IW_SLC__1SDV_20170419T102030_20170419T102057_016212_01ACCA_B667.zip

ProductSet-Reader(2)
S1A_IW_SLC__1SDV_20170501T102006_20170501T102033_016387_01B217_327E.zip
S1A_IW_SLC__1SDV_20170501T102031_20170501T102058_016387_01B217_E111.zip