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> Reference material for ST_INTERSECTS function

# ST_INTERSECTS

The `ST_INTERSECTS` function determines whether two input `GEOGRAPHY` objects intersect each other.

If either input is empty, `ST_INTERSECTS` will return `FALSE`.

Before performing the intersection check, the two inputs are aligned through a snapping process, ensuring precise calculation. For more details on snapping, refer to the [snapping documentation](/reference-sql/data-types/geography#snapping).

## Syntax

```sql theme={"theme":{"light":"github-light","dark":"github-dark"}}
ST_INTERSECTS(<geo1>, <geo2>)
```

## Parameters

| Parameter | Description                                                                    | Supported input types |
| :-------- | :----------------------------------------------------------------------------- | :-------------------- |
| `<geo1>`  | The first `GEOGRAPHY` object to check for intersection with the second object. | `GEOGRAPHY`           |
| `<geo2>`  | The second `GEOGRAPHY` object to check for intersection with the first object. | `GEOGRAPHY`           |

## Return Type

`ST_INTERSECTS` returns a value of type `BOOLEAN`.

## Example

The following code example constructs two LineStrings near Times Square in New York City from their WKT representations as `GEOGRAPHY` objects and determines if the LineStrings intersect:

```sql theme={"theme":{"light":"github-light","dark":"github-dark"}}
SELECT ST_INTERSECTS(
    ST_GEOGFROMTEXT('LINESTRING(-73.98507474330196 40.75858394491826, -73.98601039902333 40.7573327842733)'),
    ST_GEOGFROMTEXT('LINESTRING(-73.98625022413634 40.758256445020976, -73.98473358363454 40.757637261118134)')
    ) AS result
```

**Returns**

| result (BOOLEAN) |
| :--------------- |
| t                |