Update expBits used in gen2 to match gen3 value

This is required to ensure the source IDs get the same values in both middlewares. which is desirable in general and, in particular, can cause different outputs of algorithms making use of the id as an rng seed.
lsst · Jun 21, 2021 · 1aa8220 · 1aa8220
1 parent 30368a2
commit 1aa8220
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diff --git a/python/lsst/obs/lsst/imsim.py b/python/lsst/obs/lsst/imsim.py
@@ -46,7 +46,7 @@ class ImsimMapper(LsstCamMapper):
 
     def bypass_ccdExposureId_bits(self, datasetType, pythonType, location, dataId):
         """How many bits are required for the maximum exposure ID"""
-        return 38  # max detector_exposure_id ~ 60000000205
+        return 34  # To match the value computed in gen3
 
 
 class ImsimParseTask(LsstCamParseTask):

diff --git a/python/lsst/obs/lsst/phosim.py b/python/lsst/obs/lsst/phosim.py
@@ -44,7 +44,7 @@ class PhosimMapper(LsstCamMapper):
 
     def bypass_ccdExposureId_bits(self, datasetType, pythonType, location, dataId):
         """How many bits are required for the maximum exposure ID"""
-        return 38  # max detector_exposure_id ~ 60000000205
+        return 34  # To match the value computed in gen3
 
 
 class PhosimParseTask(LsstCamParseTask):