Request for an ENHANCEMENT from Cartography and Imaging Science (CIS) Node : please add scaling_factor and value_offsett to Spectral Discipline Dictionary?
Hi Anne,
The Band_Bin_Set class has been deprecated from PDS4 and most of its attributes were picked up by . We still have a need to specify the scale factors and offsets applied to the individual bands of THEMIS multiband images, that we are migrating from PDS3. It is possible that future missions will continue to use this approach to represent floating point data as integers, in order to reduce data volume. PDS4 allows only a single scaling_factor and value_offset for each digital object, so to use it we would have to document each plane as an individual Array_2D_Image with its own and characteristics, instead of simply describing the data product as a single Array_3D_Image with different scale factors and offsets for each band.
We could add this to but we think the right solution is to add it to the Axis_BinSet* classes that are already in . Some suggestions for doing so are attached. Please let me know whether you concur, or can suggest an alternate solution, or need further information such as a specific use case?
Issue Type
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LDD Dictionary Version
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PDS4 IM Version
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Request for an ENHANCEMENT from Cartography and Imaging Science (CIS) Node : please add scaling_factor and value_offsett to Spectral Discipline Dictionary?
Hi Anne,
The Band_Bin_Set class has been deprecated from PDS4 and most of its attributes were picked up by. We still have a need to specify the scale factors and offsets applied to the individual bands of THEMIS multiband images, that we are migrating from PDS3. It is possible that future missions will continue to use this approach to represent floating point data as integers, in order to reduce data volume. PDS4 allows only a single scaling_factor and value_offset for each digital object, so to use it we would have to document each plane as an individual Array_2D_Image with its own and characteristics, instead of simply describing the data product as a single Array_3D_Image with different scale factors and offsets for each band.
We could add this to but we think the right solution is to add it to the Axis_BinSet* classes that are already in . Some suggestions for doing so are attached. Please let me know whether you concur, or can suggest an alternate solution, or need further information such as a specific use case?
Thanks, Paul Geissler (CIS) pgeissler@usgs.gov
spectral_dictionary_scale_offset.txt
Issue Type Using the LABELS section to the right of this window >>>> , please indicate if this is a BUG or ENHANCEMENT request. If unknown, feel free to leave that blank and the LDD Steward can triage appropriately.
Describe the issue identified (if applicable) A clear and concise description of the issue you encountered using the dictionary.
Describe the solution you'd like A clear and concise description of what you want to happen. Where possible please include details like:
Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.
LDD Dictionary Version For bug fixes, note the LDD dictionary version in question.
PDS4 IM Version For new feature requests, please note the PDS4 Information Model version you would like the new feature implemented against.
Need-by Date Describe a need-by date for these updates and the rationale for that date.
Additional context Add any other context or examples products