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The spatial baseline is NoData !!! #228

Closed ZGHHGZ closed 10 months ago

ZGHHGZ commented 11 months ago

Since June 2023, the spatial baseline of sentinel image data obtained using Discovery-asf_search has been Nodata.

SpicyGarlicAlbacoreRoll commented 11 months ago

Thank you for submitting an issue, can you provide the steps to reproduce this with an example, along with the expected vs. actual behavior?

ZGHHGZ commented 11 months ago

Thank you for submitting an issue, can you provide the steps to reproduce this with an example, along with the expected vs. actual behavior?

1697614712915

SpicyGarlicAlbacoreRoll commented 11 months ago

Thank you for the example, We don't remove products from the stack if they have a null perpendicularBaseline as we currently leave that up to the user to decide what to do with those products. Something like this line below would remove the ones with null perpendicularBaseline:

cleaned_stack = asf.ASFSearchResults([product for product in stack if product.properties['perpendicularBaseline'] is not None])

There are a couple instances where we assign null to the perpendicularBaseline:

At first glance the scene you've provided does have valid state vectors, so can you provide the reference scene fileID for this particular stack? It may very well meet the 2nd criteria by exceeding 100,000, and gets assigned null.

ZGHHGZ commented 11 months ago

Thank you for the example, We don't remove products from the stack if they have a null perpendicularBaseline as we currently leave that up to the user to decide what to do with those products. Something like this line below would remove the ones with null perpendicularBaseline:

cleaned_stack = asf.ASFSearchResults([product for product in stack if product.properties['perpendicularBaseline'] is not None])

There are a couple instances where we assign null to the perpendicularBaseline:

  • The SLC has no valid state vectors
  • the absolute value of the perpendicularBaseline we calculated internally is greater than 100,000

At first glance the scene you've provided does have valid state vectors, so can you provide the reference scene fileID for this particular stack? It may very well meet the 2nd criteria by exceeding 100,000, and gets assigned null. a0d0beb2b7552a811ee252d36ec76483 the reference scene fileID for this particular stack.

SpicyGarlicAlbacoreRoll commented 11 months ago

Thank you for the screenshot! It looks like the code used to find that reference yields a different result from your original stack. Since Sentinel-1 is a always updating with new data asf_search would return newer results that will differ from the last time you performed a geo search over that area.

Because of this, when I call stack() for the scene S1A_IW_SLC__1SDV_20231016T101321_20231016T101348_050789_061EF5_279C-SLC, the scene from your first image with a null perpendicularBasline (S1A_IW_SLC__1SDV_20230414T100447_20230414T100514_048091_05C7F9_4F9E-SLC) doesn't appear in the stack.

Without the original reference scene to rebuild the original stack from, I highly suspect that what you've encountered was a baseline pair that had a high perpendicular baseline that exceeded the 100,000 threshold that was automatically set to null.

ZGHHGZ commented 10 months ago

Thank you for the screenshot! It looks like the code used to find that reference yields a different result from your original stack. Since Sentinel-1 is a always updating with new data asf_search would return newer results that will differ from the last time you performed a geo search over that area.

Because of this, when I call stack() for the scene S1A_IW_SLC__1SDV_20231016T101321_20231016T101348_050789_061EF5_279C-SLC, the scene from your first image with a null perpendicularBasline (S1A_IW_SLC__1SDV_20230414T100447_20230414T100514_048091_05C7F9_4F9E-SLC) doesn't appear in the stack.

Without the original reference scene to rebuild the original stack from, I highly suspect that what you've encountered was a baseline pair that had a high perpendicular baseline that exceeded the 100,000 threshold that was automatically set to null.

I have reproduced this issue and have chosen to search separately using the latest and oldest images from the same stack. The results indicate that using the latest image search stack can only obtain spatial baselines after June 18, 2023, while using the oldest image search stack can only obtain spatial baselines before June 18, 2023. The following file shows the results of two different searches. I can obtain all baseline data through the ASF online website for baseline search, but using Python for search can only obtain partial spatial baseline data.

11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 ee69d48775a8edf6bcd90d52099ec5ee

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S1A_IW_SLC__1SDV_20200808T101302_20200808T101329_033814_03EB9C_E664-SLC None S1A_IW_SLC1SDV_20200820T101303_20200820T101330_033989_03F1BE_E2C6-SLC None S1A_IW_SLC1SDV_20200901T101303_20200901T101330_034164_03F7ED_A5D9-SLC None S1A_IW_SLC__1SDV_20200913T101304_20200913T101331_034339_03FE0D_C53C-SLC None S1A_IW_SLC1SDV_20200925T101304_20200925T101331_034514_040436_8959-SLC None S1A_IW_SLC1SDV_20201007T101305_20201007T101332_034689_040A5B_B112-SLC None S1A_IW_SLC__1SDV_20201019T101305_20201019T101332_034864_04107F_5878-SLC None S1A_IW_SLC1SDV_20201031T101305_20201031T101332_035039_041673_EFC9-SLC None S1A_IW_SLC1SDV_20201112T101304_20201112T101331_035214_041C91_A298-SLC None S1A_IW_SLC__1SDV_20201124T101304_20201124T101331_035389_04229A_330F-SLC None S1A_IW_SLC1SDV_20201206T101304_20201206T101331_035564_0428A2_3AD5-SLC None S1A_IW_SLC1SDV_20201218T101303_20201218T101330_035739_042EA4_DDCE-SLC None S1A_IW_SLC__1SDV_20201230T101303_20201230T101329_035914_0434CE_8225-SLC None S1A_IW_SLC1SDV_20210111T101302_20210111T101329_036089_043AE5_B770-SLC None S1A_IW_SLC1SDV_20210123T101301_20210123T101328_036264_0440FC_7D8A-SLC None S1A_IW_SLC__1SDV_20210204T101301_20210204T101328_036439_044707_E9C2-SLC None S1A_IW_SLC1SDV_20210216T101301_20210216T101328_036614_044D25_9F2A-SLC None S1A_IW_SLC1SDV_20210228T101301_20210228T101328_036789_04533C_4182-SLC None S1A_IW_SLC__1SDV_20210312T101301_20210312T101328_036964_045955_7AB9-SLC None S1A_IW_SLC1SDV_20210324T101301_20210324T101328_037139_045F65_8D5D-SLC None S1A_IW_SLC1SDV_20210405T101301_20210405T101328_037314_046574_F584-SLC None S1A_IW_SLC__1SDV_20210417T101302_20210417T101329_037489_046B78_AED6-SLC None S1A_IW_SLC1SDV_20210429T101302_20210429T101329_037664_047191_06D2-SLC None S1A_IW_SLC1SDV_20210511T101303_20210511T101330_037839_04774B_BC3C-SLC None S1A_IW_SLC__1SDV_20210523T101303_20210523T101330_038014_047C93_A918-SLC None S1A_IW_SLC1SDV_20210604T101304_20210604T101331_038189_0481CE_0B8B-SLC None S1A_IW_SLC1SDV_20210616T101305_20210616T101332_038364_0486FE_C2ED-SLC None S1A_IW_SLC__1SDV_20210628T101306_20210628T101333_038539_048C41_4E20-SLC None S1A_IW_SLC1SDV_20210710T101306_20210710T101333_038714_049183_97EA-SLC None S1A_IW_SLC1SDV_20210722T101307_20210722T101334_038889_0496BE_4984-SLC None S1A_IW_SLC__1SDV_20210803T101308_20210803T101335_039064_049BF2_13B0-SLC None S1A_IW_SLC1SDV_20210815T101308_20210815T101335_039239_04A1E9_65E7-SLC None S1A_IW_SLC1SDV_20210827T101309_20210827T101336_039414_04A7E8_F113-SLC None S1A_IW_SLC__1SDV_20210908T101310_20210908T101336_039589_04ADF8_C4EF-SLC None S1A_IW_SLC1SDV_20210920T101310_20210920T101337_039764_04B3E9_664E-SLC None S1A_IW_SLC1SDV_20211002T101310_20211002T101337_039939_04B9F7_2DE8-SLC None S1A_IW_SLC__1SDV_20211014T101310_20211014T101337_040114_04BFFD_C829-SLC None S1A_IW_SLC1SDV_20211026T101310_20211026T101337_040289_04C61B_1CCF-SLC None S1A_IW_SLC1SDV_20211107T101310_20211107T101337_040464_04CC37_1BC7-SLC None S1A_IW_SLC__1SDV_20211119T101310_20211119T101337_040639_04D23B_4247-SLC None S1A_IW_SLC1SDV_20211201T101309_20211201T101336_040814_04D85B_933F-SLC None S1A_IW_SLC1SDV_20211213T101309_20211213T101336_040989_04DE5C_1938-SLC None S1A_IW_SLC__1SDV_20220106T101308_20220106T101335_041339_04EA18_0DE3-SLC None S1A_IW_SLC1SDV_20220118T101307_20220118T101334_041514_04EFD4_E72D-SLC None S1A_IW_SLC1SDV_20220130T101307_20220130T101334_041689_04F5C9_5D47-SLC None S1A_IW_SLC__1SDV_20220211T101306_20220211T101333_041864_04FBD3_0F7D-SLC None S1A_IW_SLC1SDV_20220223T101306_20220223T101333_042039_0501F3_1F84-SLC None S1A_IW_SLC1SDV_20220307T101306_20220307T101333_042214_0507E2_9D3E-SLC None S1A_IW_SLC__1SDV_20220319T101306_20220319T101333_042389_050DD1_9A99-SLC None S1A_IW_SLC1SDV_20220331T101306_20220331T101333_042564_0513C2_2EA7-SLC None S1A_IW_SLC1SDV_20220412T101307_20220412T101334_042739_0519A2_90F6-SLC None S1A_IW_SLC__1SDV_20220424T101308_20220424T101335_042914_051F74_25A7-SLC None S1A_IW_SLC1SDV_20220506T101308_20220506T101335_043089_05253B_0590-SLC None S1A_IW_SLC1SDV_20220518T101309_20220518T101336_043264_052AB1_CBCF-SLC None S1A_IW_SLC__1SDV_20220530T101310_20220530T101337_043439_052FDE_3836-SLC None S1A_IW_SLC1SDV_20220611T101311_20220611T101338_043614_053509_C9A3-SLC None S1A_IW_SLC1SDV_20220623T101311_20220623T101338_043789_053A47_9439-SLC None S1A_IW_SLC__1SDV_20220705T101312_20220705T101339_043964_053F7C_5DAC-SLC None S1A_IW_SLC1SDV_20220717T101313_20220717T101340_044139_0544BC_704F-SLC None S1A_IW_SLC1SDV_20220729T101314_20220729T101340_044314_0549E2_58AC-SLC None S1A_IW_SLC__1SDV_20220810T101314_20220810T101341_044489_054F1A_B8B4-SLC None S1A_IW_SLC1SDV_20220822T101315_20220822T101342_044664_0554FB_BA66-SLC None S1A_IW_SLC1SDV_20220903T101316_20220903T101343_044839_055AE4_0F6C-SLC None S1A_IW_SLC__1SDV_20220915T101316_20220915T101343_045014_0560C3_4D24-SLC None S1A_IW_SLC1SDV_20220927T101316_20220927T101343_045189_0566A9_6DA6-SLC None S1A_IW_SLC1SDV_20221009T101316_20221009T101343_045364_056C83_EEA7-SLC None S1A_IW_SLC__1SDV_20221021T101316_20221021T101343_045539_0571B0_7757-SLC None S1A_IW_SLC1SDV_20221102T101316_20221102T101343_045714_05779A_6334-SLC None S1A_IW_SLC1SDV_20221114T101316_20221114T101343_045889_057D87_5FEC-SLC None S1A_IW_SLC__1SDV_20221126T101316_20221126T101343_046064_05836E_CC54-SLC None S1A_IW_SLC1SDV_20221208T101315_20221208T101342_046239_05896A_5F36-SLC None S1A_IW_SLC1SDV_20221220T101314_20221220T101341_046414_058F65_D66A-SLC None S1A_IW_SLC__1SDV_20230101T101314_20230101T101341_046589_059552_3387-SLC None S1A_IW_SLC1SDV_20230113T101313_20230113T101340_046764_059B32_3A13-SLC None S1A_IW_SLC1SDV_20230125T101313_20230125T101340_046939_05A120_0A2F-SLC None S1A_IW_SLC__1SDV_20230206T101312_20230206T101339_047114_05A6F5_B469-SLC None S1A_IW_SLC1SDV_20230218T101312_20230218T101339_047289_05ACDF_CE86-SLC None S1A_IW_SLC1SDV_20230302T101312_20230302T101339_047464_05B2C8_4D9A-SLC None S1A_IW_SLC__1SDV_20230314T101312_20230314T101339_047639_05B8B7_9531-SLC None S1A_IW_SLC1SDV_20230326T101312_20230326T101339_047814_05BE9C_D59C-SLC None S1A_IW_SLC1SDV_20230407T101313_20230407T101339_047989_05C485_55A3-SLC None S1A_IW_SLC__1SDV_20230419T101312_20230419T101339_048164_05CA6C_6124-SLC None S1A_IW_SLC1SDV_20230501T101314_20230501T101341_048339_05D04C_6D96-SLC None S1A_IW_SLC1SDV_20230513T101314_20230513T101341_048514_05D5EA_C042-SLC None S1A_IW_SLC__1SDV_20230525T101315_20230525T101341_048689_05DB13_39E2-SLC None S1A_IW_SLC1SDV_20230606T101315_20230606T101342_048864_05E053_BDCE-SLC None S1A_IW_SLC1SDV_20230618T101316_20230618T101343_049039_05E5A8_AEB1-SLC -7 S1A_IW_SLC__1SDV_20230630T101316_20230630T101343_049214_05EAF5_7B25-SLC 58 S1A_IW_SLC1SDV_20230712T101318_20230712T101344_049389_05F067_10A4-SLC -118 S1A_IW_SLC1SDV_20230724T101318_20230724T101345_049564_05F5BB_FB73-SLC -128 S1A_IW_SLC__1SDV_20230805T101319_20230805T101346_049739_05FB20_C29D-SLC -157 S1A_IW_SLC1SDV_20230817T101320_20230817T101346_049914_0600FF_6CC9-SLC 38 S1A_IW_SLC1SDV_20230829T101320_20230829T101347_050089_060703_772E-SLC -65 S1A_IW_SLC__1SDV_20230910T101321_20230910T101348_050264_060CF4_D439-SLC -159 S1A_IW_SLC1SDV_20230922T101321_20230922T101348_050439_0612EA_960D-SLC -155 S1A_IW_SLC__1SDV_20231004T101321_20231004T101348_050614_0618ED_AF9D-SLC -52 S1A_IW_SLC__1SDV_20231016T101321_20231016T101348_050789_061EF5_279C-SLC 0 30cf6dd4171ce5931076191c9c176ba0

2222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222 105222c69295edd10d683d4e7f1be495

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S1A_IW_SLC1SDV_20161227T101227_20161227T101254_014564_017A8E_06B6-SLC -1 S1A_IW_SLC1SDV_20170108T101225_20170108T101252_014739_017FDE_7F23-SLC 12 S1A_IW_SLC__1SDV_20170201T101225_20170201T101252_015089_018AA5_2A3E-SLC -48 S1A_IW_SLC1SDV_20170213T101224_20170213T101251_015264_019023_BE97-SLC -1 S1A_IW_SLC1SDV_20170225T101224_20170225T101251_015439_01957D_99AC-SLC 27 S1A_IW_SLC__1SDV_20170309T101224_20170309T101251_015614_019ACA_F609-SLC 27 S1A_IW_SLC1SDV_20170321T101219_20170321T101246_015789_01A001_7A19-SLC -32 S1A_IW_SLC1SDV_20170402T101219_20170402T101246_015964_01A531_FC1E-SLC -66 S1A_IW_SLC__1SDV_20170414T101220_20170414T101247_016139_01AA83_4C86-SLC -86 S1A_IW_SLC1SDV_20170426T101220_20170426T101247_016314_01AFDE_08EF-SLC 45 S1A_IW_SLC1SDV_20170508T101221_20170508T101248_016489_01B52E_DB72-SLC -102 S1A_IW_SLC__1SDV_20170520T101238_20170520T101305_016664_01BA87_6315-SLC -95 S1A_IW_SLC1SDV_20170601T101222_20170601T101249_016839_01BFEC_E5D6-SLC -67 S1A_IW_SLC1SDV_20170613T101240_20170613T101307_017014_01C55B_8D4D-SLC -31 S1A_IW_SLC__1SDV_20170625T101241_20170625T101307_017189_01CAB2_4259-SLC -7 S1A_IW_SLC1SDV_20170719T101242_20170719T101309_017539_01D54E_9EA7-SLC -32 S1A_IW_SLC1SDV_20170731T101243_20170731T101310_017714_01DAA9_5E70-SLC -92 S1A_IW_SLC__1SDV_20170812T101243_20170812T101310_017889_01DFF9_F952-SLC -80 S1A_IW_SLC1SDV_20170824T101244_20170824T101311_018064_01E543_DF9A-SLC 7 S1A_IW_SLC1SDV_20170905T101244_20170905T101311_018239_01EA97_2706-SLC 20 S1A_IW_SLC__1SDV_20170917T101245_20170917T101312_018414_01F00B_0517-SLC -65 S1A_IW_SLC1SDV_20171011T101245_20171011T101312_018764_01FAB1_C738-SLC -119 S1A_IW_SLC1SDV_20171023T101245_20171023T101312_018939_020013_7DB1-SLC -51 S1A_IW_SLC__1SDV_20171104T101245_20171104T101312_019114_020569_6E21-SLC 37 S1A_IW_SLC1SDV_20171116T101245_20171116T101312_019289_020ADE_E13F-SLC 14 S1A_IW_SLC1SDV_20171128T101245_20171128T101312_019464_021067_B53B-SLC -55 S1A_IW_SLC__1SDV_20171210T101244_20171210T101311_019639_0215DD_ECF3-SLC -17 S1A_IW_SLC1SDV_20171222T101243_20171222T101310_019814_021B3F_E9AA-SLC 75 S1A_IW_SLC1SDV_20180103T101243_20180103T101310_019989_0220C5_78B2-SLC 97 S1A_IW_SLC__1SDV_20180115T101243_20180115T101310_020164_022650_3C82-SLC 40 S1A_IW_SLC1SDV_20180127T101242_20180127T101309_020339_022BDB_E3BF-SLC -6 S1A_IW_SLC1SDV_20180208T101242_20180208T101309_020514_023172_9C59-SLC -66 S1A_IW_SLC__1SDV_20180220T101242_20180220T101309_020689_023704_3019-SLC -53 S1A_IW_SLC1SDV_20180304T101242_20180304T101309_020864_023C8E_0CE2-SLC -36 S1A_IW_SLC1SDV_20180328T101242_20180328T101309_021214_0247AB_46AC-SLC -3 S1A_IW_SLC__1SDV_20180409T101243_20180409T101310_021389_024D2B_D7E2-SLC -37 S1A_IW_SLC1SDV_20180421T101243_20180421T101310_021564_02529C_691C-SLC -44 S1A_IW_SLC1SDV_20180503T101244_20180503T101311_021739_02581D_269E-SLC 17 S1A_IW_SLC__1SDV_20180515T101244_20180515T101311_021914_025DBA_5277-SLC -37 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ZGHHGZ commented 10 months ago

@SpicyGarlicAlbacoreRoll Because the spatial baseline values on the ASF website are correct, I believe this issue can be resolved in asf_search.

ZGHHGZ commented 10 months ago

@SpicyGarlicAlbacoreRoll Comparing the use of the latest and oldest images to obtain spatial baselines, we can see that June 2023 is a special time when the spatial baseline value changes from here to nodata. This time period is the time when the burst data search function is open, and I think it may be related to this event.

SpicyGarlicAlbacoreRoll commented 10 months ago

Thank you for your help, we've pinpointed the issue and have sent out a fix with asf-search v6.7.1!

The cause was from certain granules missing the 'Z' time zone indicators for ascending node time and/or state vector times, causing datetime.timestamp() to give different values depending on system environments. Because of this stacking worked as expected in places like the automated test suite or docker container environments, but not on user systems depending on time zone.

glshort commented 10 months ago

It appears v6.7.1 has made it to PyPI, Conda should show up soon as well.

ZGHHGZ commented 10 months ago

thanks