# Acceleration of an entity
**URL:** https://community.cesium.com/t/acceleration-of-an-entity/37742
**Category:** CesiumJS
**Created:** [January 5, 2025, 12:22pm UTC](https://community.cesium.com/t/acceleration-of-an-entity/37742 "2025-01-05T12:22:29Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@srce](https://community.cesium.com/u/srce)
#### Post date: [January 5, 2025, 12:22pm UTC](https://community.cesium.com/t/acceleration-of-an-entity/37742/1 "2025-01-05T12:22:29Z")
What’s the recommended way to get the acceleration of an entity at a specific time?
For velocity, there’s Cesium.VelocityVectorProperty. But there doesn’t appear to be something similar for acceleration?
Thanks.
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### Author:  [@Gabby\_Getz](https://community.cesium.com/u/Gabby_Getz)
#### Post date: [January 7, 2025, 8:56pm UTC](https://community.cesium.com/t/acceleration-of-an-entity/37742/2 "2025-01-07T20:56:02Z")
Hi @srce,
I don’t believe there is a built-in property type corresponding to an entity’s acceleration. However, this value should be fairly straightforward to evaluate.
What’s the use case here? Are you looking to display the value, or is the use case a bit more complex?
In fact, I think it’s possible to evaluate the VelocityVectorProperty _of_ the entity’s VelcoityVectorProperty in order to compute the acceleration– [Here’s a quick example.](https://sandcastle.cesium.com/#c=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)
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### Author:  [@srce](https://community.cesium.com/u/srce)
#### Post date: [January 8, 2025, 11:01am UTC](https://community.cesium.com/t/acceleration-of-an-entity/37742/3 "2025-01-08T11:01:57Z")
Thanks - I don’t think that example is producing valid values for acceleration though. (E.g. 382270749m/s^2). Looking through the code it looks like it should work though.
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### Author:  [@srce](https://community.cesium.com/u/srce)
#### Post date: [January 8, 2025, 12:36pm UTC](https://community.cesium.com/t/acceleration-of-an-entity/37742/4 "2025-01-08T12:36:06Z")
Ah, I think it doesn’t work because VelocityVectorProperty.getValue isn’t re-entrant. The scratch variables (position1Scratch…) used to store velocities get corrupted with positions (when accelerationVectorProperty.getValue() calls velocityVectorProperty.getValue()).
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### Author:  [@Marco13](https://community.cesium.com/u/Marco13)
#### Post date: [January 8, 2025, 2:02pm UTC](https://community.cesium.com/t/acceleration-of-an-entity/37742/5 "2025-01-08T14:02:02Z")
Besides the issue of the `scratch...` variables, there is also a… conceptual question.
In the example (and in many cases), the position is a sampled position property with _linear_ interpolation. This means that the _velocity_ between two sampling points is constant. And the _acceleration_ between these points is _zero_, with “infinite spikes” at the times where the velocity changes:
There are different ways of avoiding that, depending on the data source. But for the example, one can use [`SampledPositionProperty#setInterpolationOptions`](https://cesium.com/learn/ion-sdk/ref-doc/SampledPositionProperty.html#setInterpolationOptions). (Note that this will compute some derivatives (i.e. the velocity and acceleration in this case) _internally_, but there is no way to access this. So the following is probably not the most efficient solution, strictly speaking, but a relatively easy one).
The next issue, about the `scratch` variables, could/can be solved by … avoiding these scratch variables. This is not directly possible with the `VelocityVectorProperty`. But … It would be easy to _generalize_ that `VelocityVectorProperty`. In the following, I just created a class called `DerivativeVectorProperty` (because that’s what it is).
An aside: This property does not have that `normalized` functionality. But that shouldn’t be a parameter of the property to begin with. If someone wants normalization, then it should be possible to “wrap” these properties, like
```auto
const position = create();
const normalizedPosition = new NormalizingProperty(position);
```
However, here’s a full sandcastle, showing this as an example. This is just quickly thrown together, based on the [“Manually Controlled Animation”](https://sandcastle.cesium.com/index.html?src=Manually%20Controlled%20Animation.html) one, but shows one possible approach:
[https://sandcastle.cesium.com/#c=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](https://sandcastle.cesium.com/#c=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)
---
### Author:  [@srce](https://community.cesium.com/u/srce)
#### Post date: [January 9, 2025, 3:12pm UTC](https://community.cesium.com/t/acceleration-of-an-entity/37742/6 "2025-01-09T15:12:27Z")
Thanks @Marco13 that looks good.
Unfortunately, I get very strange results using Lagrange interpolation with my data. Here’s the path using linear interpolation:
And here’s Lagrange with interpolationDegree 5.
The positions are a little noisy, and not sampled at equal time intervals, but from the documentation it looks like that should be ok.
Here’s a [Sandcastle](https://sandcastle.cesium.com/#c=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) showing the problem.
Plotting the data as scatter charts doesn’t show anything untoward:
Any idea what’s might be wrong?
Thanks,
Jon
---
### Author:  [@Marco13](https://community.cesium.com/u/Marco13)
#### Post date: [January 9, 2025, 4:04pm UTC](https://community.cesium.com/t/acceleration-of-an-entity/37742/7 "2025-01-09T16:04:40Z")
It’s hard to guess from the screenshots. But in general, and very roughly speaking, “noise can cause things like this during the interpolation”. There might be ways to alleviate that - maybe something like a sliding window/moving average could already reduce that “wiggling” that is visible in the second screenshot. (The scatter charts really don’t look _that_ noisy, so so maybe there’s something else - beyond the noise - that causes this…)
---
### Author:  [@srce](https://community.cesium.com/u/srce)
#### Post date: [January 10, 2025, 9:54am UTC](https://community.cesium.com/t/acceleration-of-an-entity/37742/8 "2025-01-10T09:54:23Z")
Turns out not a problem with the data, but with the CZML. I had:
```
"interpolationDegree": "5"
```
Rather than:
```
"interpolationDegree": 5
```
And the string wasn’t being evaluated as 5, but some higher number.