[Psidev-ms-dev] drift time question

[Hannes R. <han...@gm...>]

Dear list

I have a question regarding the drift time array:

[Term]
id: MS:1002816
name: mean ion mobility array
def: "Array of drift times or inverse reduced ion mobilities, averaged
from a matrix of binned m/z and ion mobility values, corresponding to
a spectrum of individual peaks encoded with an m/z array." [PSI:MS]
xref: value-type:xsd\:float "The allowed value-type for this CV term."
is_a: MS:1000513 ! binary data array
relationship: has_units UO:0000028 ! millisecond
relationship: has_units UO:0000010 ! second
relationship: has_units MS:1002814 ! "volt-second per square centimeter"

it seems to me that the formulation is somewhat unclear, what does
"averaged from a maxtrix of binned m/z and ion mobility values" mean
here. It seems strange that we have this term but no term for the
general case where we simply want to display ion mobility data. I
therefore suggest to change the existing term or add a new term

[Term]
id: MS:xxx
name: ion mobility array
def: "Array of drift times or inverse reduced ion mobilities
corresponding to a spectrum of individual peaks encoded with an m/z
array." [PSI:MS]
xref: value-type:xsd\:float "The allowed value-type for this CV term."
is_a: MS:1000513 ! binary data array
relationship: has_units UO:0000028 ! millisecond
relationship: has_units UO:0000010 ! second
relationship: has_units MS:1002814 ! "volt-second per square centimeter"


I think this would allow us to reprenst 3 dimensional data with one
array of m/z, one of intensity and one of ion mobility, right? Or
maybe I misunderstood the point of MS:1002816

Best

Hannes