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Update wavelengthIndex description for processed data #175

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Update wavelengthIndex description for processed data #175

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d8b3bfb
Update wavelengthIndex description for processed data
sreekanthkura7 Jan 12, 2026
7183ff0
Clarify wavelengthIndex requirements in specification
sreekanthkura7 Jan 12, 2026
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4 changes: 2 additions & 2 deletions snirf_specification.md
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Original file line number Diff line number Diff line change
Expand Up @@ -470,7 +470,7 @@ Index of the detector.
* **Type**: integer
* **Location**: `/nirs(i)/data(j)/measurementList(k)/wavelengthIndex`

Index of the "nominal" wavelength (in `probe.wavelengths`).
Index of the "nominal" wavelength (in `probe.wavelengths`). For processed data channels (dataType=99999) that are wavelength-independent or derived from multiple wavelengths, this field MUST be set to `0`.

@HanBnrd HanBnrd Aug 10, 2026

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Suggested change
Index of the "nominal" wavelength (in `probe.wavelengths`). For processed data channels (dataType=99999) that are wavelength-independent or derived from multiple wavelengths, this field MUST be set to `0`.
Index of the "nominal" wavelength (in `probe.wavelengths`). For processed data channels (dataType=99999) that are wavelength-independent or derived from multiple wavelengths, this field MUST be set to `-1`.


#### /nirs(i)/data(j)/measurementList(k)/wavelengthActual
* **Presence**: optional
Expand Down Expand Up @@ -592,7 +592,7 @@ Detector indices for each channel. A 1-D array with length equal to the size of
* **Type**: integer 1-D array
* **Location**: `/nirs(i)/data(j)/measurementLists/wavelengthIndex`

Index of the "nominal" wavelength (in `probe.wavelengths`) for each channel. A 1-D array with length equal to the size of the second dimension of `/nirs(i)/data(j)/dataTimeSeries`.
Index of the "nominal" wavelength (in `probe.wavelengths`) for each channel. A 1-D array with length equal to the size of the second dimension of `/nirs(i)/data(j)/dataTimeSeries`. For processed data channels (`dataType=99999`) that are wavelength-independent or derived from multiple wavelengths, the corresponding value MUST be `0`.

@HanBnrd HanBnrd Aug 10, 2026

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Suggested change
Index of the "nominal" wavelength (in `probe.wavelengths`) for each channel. A 1-D array with length equal to the size of the second dimension of `/nirs(i)/data(j)/dataTimeSeries`. For processed data channels (`dataType=99999`) that are wavelength-independent or derived from multiple wavelengths, the corresponding value MUST be `0`.
Index of the "nominal" wavelength (in `probe.wavelengths`) for each channel. A 1-D array with length equal to the size of the second dimension of `/nirs(i)/data(j)/dataTimeSeries`. For processed data channels (`dataType=99999`) that are wavelength-independent or derived from multiple wavelengths, the corresponding value MUST be `-1`.


#### /nirs(i)/data(j)/measurementLists/wavelengthActual
* **Presence**: optional
Expand Down