---
title: geo.asTracks() function
description: >
  `geo.asTracks()` groups rows into tracks (sequential, related data points).
menu:
  flux_v0_ref:
    name: geo.asTracks
    parent: experimental/geo
    identifier: experimental/geo/asTracks
weight: 201
flux/v0/tags: [transformations, geotemporal]
---

<!------------------------------------------------------------------------------

IMPORTANT: This page was generated from comments in the Flux source code. Any
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To make updates to this documentation, update the function comments above the
function definition in the Flux source code:

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Contributing to Flux: https://github.com/influxdata/flux#contributing
Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md

------------------------------------------------------------------------------->

`geo.asTracks()` groups rows into tracks (sequential, related data points).



##### Function type signature

```js
(<-tables: stream[A], ?groupBy: [string], ?orderBy: [string]) => stream[A] where A: Record
```

{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}

## Parameters

### groupBy

Columns to group by. These columns should uniquely identify each track.
Default is `["id","tid"]`.



### orderBy

Columns to order results by. Default is `["_time"]`.

Sort precedence is determined by list order (left to right).

### tables

Input data. Default is piped-forward data (`<-`).




## Examples

- [Group geotemporal data into tracks](#group-geotemporal-data-into-tracks)
- [Group geotemporal data into tracks and sort by specified columns](#group-geotemporal-data-into-tracks-and-sort-by-specified-columns)

### Group geotemporal data into tracks

```js
import "experimental/geo"

data
    |> geo.asTracks()

```

{{< expand-wrapper >}}
{{% expand "View example input and output" %}}

#### Input data

| _time                | id    | lat      | lon      |
| -------------------- | ----- | -------- | -------- |
| 2021-01-01T00:00:00Z | a213b | 14.01433 | -14.5464 |
| 2021-01-02T01:00:00Z | a213b | 13.9228  | -13.3338 |
| 2021-01-03T02:00:00Z | a213b | 15.08433 | -12.0433 |
| 2021-01-01T00:00:00Z | b546c | 14.01433 | 39.7515  |
| 2021-01-02T01:00:00Z | b546c | 13.9228  | 38.3527  |
| 2021-01-03T02:00:00Z | b546c | 15.08433 | 36.9978  |


#### Output data

| _time                | *id   | lat      | lon      |
| -------------------- | ----- | -------- | -------- |
| 2021-01-01T00:00:00Z | a213b | 14.01433 | -14.5464 |
| 2021-01-02T01:00:00Z | a213b | 13.9228  | -13.3338 |
| 2021-01-03T02:00:00Z | a213b | 15.08433 | -12.0433 |

| _time                | *id   | lat      | lon     |
| -------------------- | ----- | -------- | ------- |
| 2021-01-01T00:00:00Z | b546c | 14.01433 | 39.7515 |
| 2021-01-02T01:00:00Z | b546c | 13.9228  | 38.3527 |
| 2021-01-03T02:00:00Z | b546c | 15.08433 | 36.9978 |

{{% /expand %}}
{{< /expand-wrapper >}}

### Group geotemporal data into tracks and sort by specified columns

```js
import "experimental/geo"

data
    |> geo.asTracks(orderBy: ["lat", "lon"])

```

{{< expand-wrapper >}}
{{% expand "View example input and output" %}}

#### Input data

| _time                | id    | lat      | lon      |
| -------------------- | ----- | -------- | -------- |
| 2021-01-01T00:00:00Z | a213b | 14.01433 | -14.5464 |
| 2021-01-02T01:00:00Z | a213b | 13.9228  | -13.3338 |
| 2021-01-03T02:00:00Z | a213b | 15.08433 | -12.0433 |
| 2021-01-01T00:00:00Z | b546c | 14.01433 | 39.7515  |
| 2021-01-02T01:00:00Z | b546c | 13.9228  | 38.3527  |
| 2021-01-03T02:00:00Z | b546c | 15.08433 | 36.9978  |


#### Output data

| _time                | *id   | lat      | lon      |
| -------------------- | ----- | -------- | -------- |
| 2021-01-02T01:00:00Z | a213b | 13.9228  | -13.3338 |
| 2021-01-01T00:00:00Z | a213b | 14.01433 | -14.5464 |
| 2021-01-03T02:00:00Z | a213b | 15.08433 | -12.0433 |

| _time                | *id   | lat      | lon     |
| -------------------- | ----- | -------- | ------- |
| 2021-01-02T01:00:00Z | b546c | 13.9228  | 38.3527 |
| 2021-01-01T00:00:00Z | b546c | 14.01433 | 39.7515 |
| 2021-01-03T02:00:00Z | b546c | 15.08433 | 36.9978 |

{{% /expand %}}
{{< /expand-wrapper >}}