---
title: "MTHeatmapLayer.sourceIdentifier | Mobile sdk | Mobile sdk android | Android"
description: "sourceIdentifier"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# MTHeatmapLayer.sourceIdentifier

@SerialName(value = "source")

open override var [sourceIdentifier](https://docs.maptiler.com/mobile-sdk/android/api/-map-tiler-s-d-k/com.maptiler.maptilersdk.map.style.layer.heatmap/-m-t-heatmap-layer/source-identifier/): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)

Identifier of the source to be used for this layer.