Data Item _array_intensities.linearity
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General 
- Item name
- _array_intensities.linearity
- Category name
- array_intensities
- Attribute name
- linearity
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
Item Description
The intensity linearity scaling method used to convert
from the raw intensity to the stored element value:
'linear' is linear.
'offset' means that the value defined by
_array_intensities.offset should be added to each
element value.
'scaling' means that the value defined by
_array_intensities.scaling should be multiplied with each
element value.
'scaling_offset' is the combination of the two previous cases,
with the scale factor applied before the offset value.
'sqrt_scaled' means that the square root of raw
intensities multiplied by _array_intensities.scaling is
calculated and stored, perhaps rounded to the nearest
integer. Thus, linearization involves dividing the stored
values by _array_intensities.scaling and squaring the
result.
'logarithmic_scaled' means that the logarithm base 10 of
raw intensities multiplied by _array_intensities.scaling
is calculated and stored, perhaps rounded to the nearest
integer. Thus, linearization involves dividing the stored
values by _array_intensities.scaling and calculating 10
to the power of this number.
'raw' means that the data are a set of raw values straight
from the detector.
Data Type 
- Data type code
- code
- Data type detail
- code item types/single words ...
- Primitive data type code
- char
- Regular expression
- [_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| linear | |
| logarithmic_scaled | The logarithm base 10 of raw intensities multiplied by _array_intensities.scaling is calculated and stored, perhaps rounded to the nearest integer. Thus, linearization involves dividing the stored values by _array_intensities.scaling and calculating 10 to the power of this number. |
| offset | The value defined by _array_intensities.offset should be added to each element value. |
| raw | The array consists of raw values to which no corrections have been applied. While the handling of the data is similar to that given for 'linear' data with no offset, the meaning of the data differs in that the number of incident photons is not necessarily linearly related to the number of counts reported. This value is intended for use either in calibration experiments or to allow for handling more complex data-fitting algorithms than are allowed for by this data item. |
| scaling | The value defined by _array_intensities.scaling should be multiplied with each element value. |
| scaling_offset | The combination of the scaling and offset with the scale factor applied before the offset value. |
| sqrt_scaled | The square root of raw intensities multiplied by _array_intensities.scaling is calculated and stored, perhaps rounded to the nearest integer. Thus, linearization involves dividing the stored values by _array_intensities.scaling and squaring the result. |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| linear | |
| logarithmic_scaled | The logarithm base 10 of raw intensities multiplied by _array_intensities.scaling is calculated and stored, perhaps rounded to the nearest integer. Thus, linearization involves dividing the stored values by _array_intensities.scaling and calculating 10 to the power of this number. |
| offset | The value defined by _array_intensities.offset should be added to each element value. |
| raw | The array consists of raw values to which no corrections have been applied. While the handling of the data is similar to that given for 'linear' data with no offset, the meaning of the data differs in that the number of incident photons is not necessarily linearly related to the number of counts reported. This value is intended for use either in calibration experiments or to allow for handling more complex data-fitting algorithms than are allowed for by this data item. |
| scaling | The value defined by _array_intensities.scaling should be multiplied with each element value. |
| scaling_offset | The combination of the scaling and offset with the scale factor applied before the offset value. |
| sqrt_scaled | The square root of raw intensities multiplied by _array_intensities.scaling is calculated and stored, perhaps rounded to the nearest integer. Thus, linearization involves dividing the stored values by _array_intensities.scaling and squaring the result. |