# fsMapViewSetAltitudeRangeInFeet<no value>
This function can be used to set the altitude range which will then be used to compute how the color list will be spread out when the function `fsMapViewSetViewMode` is set to "Altitude" view mode.

 

 

##### Syntax

``` wasm
bool fsMapViewSetAltitudeRangeInFeet(
    FsContext ctx,
    FsTextureId id,
    double dMin,
    double dMax
    )
```

 

##### Members

{{< table-wrapper >}}

| Parameters | Description                                                                |
|------------|----------------------------------------------------------------------------|
| `ctx`      | A value of type `FsContext` provided as an argument of the gauge callback. |
| `id`       | The MapView render ID as returned by the function `fsMapViewCreate`.       |
| `dMin`     | The minimum altitude to use, in {{< glossterm >}}ft{{< /glossterm >}}.      |
| `dMax`     | The maximum altitude to use, in {{< glossterm >}}ft{{< /glossterm >}}.      |

{{< /table-wrapper >}}


 

##### Return Values

Returns false if:

-   `dMax` is less than `dMin`
-   no texture matches the given MapView ID
-   the `ctx` is invalid

Otherwise it will return true.

 

##### Remarks

Once you give a minimum and a maximum altitude, the colours (defined using `fsMapViewSetAltitudeColorList`) will be assigned automatically at intervals based on the total number of colours defined. For example, if you have defined 5 colours and set the `dMin` to 1000 and the `dMax` to 10000, the first colour will be from sea-level to 1000{{< glossterm >}}ft{{< /glossterm >}}, then the others will be applied every 3000{{< glossterm >}}ft{{< /glossterm >}}:

-   0 - 1000: colour1
-   1000 - 4000: colour2
-   4000 - 7000: colour3
-   7000 - 10000: colour4
-   10000+: colour5