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Re: [accelerometer] includeGravity parameter turns low-level sensor into high-level fused one.

From: Tobie Langel via GitHub <sysbot+gh@w3.org>
Date: Fri, 02 Sep 2016 12:40:08 +0000
To: public-device-apis-log@w3.org
Message-ID: <issue_comment.created-244363724-1472820006-sysbot+gh@w3.org>
> Thanks for clarification, but as I mentioned before, linear 
acceleration readings can be provided by hw (same accelerometer imu) 
without doing sensor fusion in SW.

Yes, that's because there's a sensor hub that contains both a 
gyroscope and an accelerometer and uses the output of both of them 
together to calculate linear acceleration through sensor fusion. In 
the process it provides a completely different data source.

This contrasts with correcting drift on a a gyroscope which more akin 
to dynamic calibration (i.e. using output of other sensors to provide 
a more precise measurement) than sensor fusion (combining different 
sensors to provide a new kind of data).

That said, it might be more appropriate to distinguish `Gyroscope` 
from `AngularVelocity` (dynamically calibrated output of a gyroscope).

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