---
title: geo.strictFilter() function
description: geo.strictFilter() filters data by latitude and longitude in a specified region.
url: https://docs.influxdata.com/flux/v0/stdlib/experimental/geo/strictfilter/
estimated_tokens: 769
product: Flux
version: v0
publisher: InfluxData
canonical: https://docs.influxdata.com/flux/v0/stdlib/experimental/geo/strictfilter/
date: '2024-04-08T16:01:02-06:00'
lastmod: '2024-04-08T16:01:02-06:00'
---

* Flux 0.63.0+

InfluxDB support

> [!Important]
> `geo.strictFilter()` is experimental and [subject to change at any time](/flux/v0/stdlib/experimental/#experimental-packages-are-subject-to-change).

`geo.strictFilter()` filters data by latitude and longitude in a specified region.

This filter is more strict than `geo.gridFilter()`, but for the best performance,
use `geo.strictFilter()` after `geo.gridFilter()`.
Input rows must have `lat` and `lon` columns.

##### Function type signature

```js
(<-tables: stream[{B with lon: D, lat: C}], region: A) => stream[{B with lon: D, lat: C}] where A: Record
```

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

## Parameters

### region

(Required)
Region containing the desired data points.

Specify record properties for the shape.

### tables

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

## Examples

### Strictly filter data to a specified region

```js
import "experimental/geo"

data
    |> geo.strictFilter(region: {lat: 40.69335938, lon: -73.30078125, radius: 50.0})
```

[](#view-example-input-and-output)

View example input and output

#### Input data

|       \_time       |\*id |  lat   |   lon   |\*s2\_cell\_id|
|--------------------|-----|--------|---------|--------------|
|2021-01-03T02:00:00Z|a213b|39.08433|\-75.9978|     89bc     |

|       \_time       |\*id |  lat   |   lon   |\*s2\_cell\_id|
|--------------------|-----|--------|---------|--------------|
|2021-01-01T00:00:00Z|a213b|41.01433|\-70.7515|     89e4     |

|       \_time       |\*id |  lat  |   lon   |\*s2\_cell\_id|
|--------------------|-----|-------|---------|--------------|
|2021-01-02T01:00:00Z|a213b|40.9228|\-73.3527|     89ec     |

#### Output data

|       \_time       |\*id |  lat  |   lon   |\*s2\_cell\_id|
|--------------------|-----|-------|---------|--------------|
|2021-01-02T01:00:00Z|a213b|40.9228|\-73.3527|     89ec     |

#### Related

* [geo.gridFilter() function](/flux/v0/stdlib/experimental/geo/gridfilter/)
* [geo.filterRows() function](/flux/v0/stdlib/experimental/geo/filterrows/)
* [geo.toRows() function](/flux/v0/stdlib/experimental/geo/torows/)
* [Work with geo-temporal data](/influxdb/v2/query-data/flux/geo/)

[transformations](/flux/v0/tags/transformations/)[filters](/flux/v0/tags/filters/)[geotemporal](/flux/v0/tags/geotemporal/)
| _time | *id | lat | lon | *s2_cell_id |
| --- | --- | --- | --- | --- |
| _time | *id | lat | lon | *s2_cell_id |
| 2021-01-03T02:00:00Z | a213b | 39.08433 | -75.9978 | 89bc |

| _time | *id | lat | lon | *s2_cell_id |
| --- | --- | --- | --- | --- |
| _time | *id | lat | lon | *s2_cell_id |
| 2021-01-01T00:00:00Z | a213b | 41.01433 | -70.7515 | 89e4 |

| _time | *id | lat | lon | *s2_cell_id |
| --- | --- | --- | --- | --- |
| _time | *id | lat | lon | *s2_cell_id |
| 2021-01-02T01:00:00Z | a213b | 40.9228 | -73.3527 | 89ec |

| _time | *id | lat | lon | *s2_cell_id |
| --- | --- | --- | --- | --- |
| _time | *id | lat | lon | *s2_cell_id |
| 2021-01-02T01:00:00Z | a213b | 40.9228 | -73.3527 | 89ec |