---
title: "MTHeatmapLayerOptions.sourceId | Mobile sdk | Mobile sdk android | Android"
description: "sourceId"
---

# MTHeatmapLayerOptions.sourceId

val [sourceId](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.helpers/-m-t-heatmap-layer-options/source-id/): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)? = null