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[convert2gamma] fix S1 GRD thermal noise removal #416

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Merged
johntruckenbrodt merged 1 commit into from
Mar 24, 2026
+10 −6
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[convert2gamma] fix S1 GRD thermal noise removal #416

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16 changes: 10 additions & 6 deletions pyroSAR/gamma/util.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@
from ..drivers import ID, identify_many
from . import ISPPar, Namespace, par2hdr
from ..ancillary import multilook_factors, hasarg, groupby, Lock
from pyroSAR.examine import ExamineSnap
from pyroSAR.examine import ExamineSnap, ExamineGamma
from .auxil import do_execute

import logging
Expand Down Expand Up @@ -336,11 +336,15 @@ def convert2gamma(id, directory, S1_tnr=True, S1_bnr=True,

product = match.group('product')

# specify noise calibration file
# L1 GRD product: thermal noise already subtracted, specify xml_noise to add back thermal noise
# SLC products: specify noise file to remove noise
# xml_noise = '-': noise file not specified
if (S1_tnr and product == 'slc') or (not S1_tnr and product == 'grd'):
# In versions released before July 2015, it was assumed that noise was already
# removed in GRDs and specifying the XML file meant adding it back to the data.
version = ExamineGamma().version
if version < '20150701':
c = (S1_tnr and product == 'slc') or (not S1_tnr and product == 'grd')
else:
c = S1_tnr

if c:
xml_noise = os.path.join(id.scene, 'annotation', 'calibration', 'noise-' + base)
else:
xml_noise = '-'
Expand Down
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