Undue space in layout! how to solve?

Anunduespaceappearedintheandroidproject...HowcanIsolveit?

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.wbsotware.wesley.forecast.MainActivity">

<ImageView
    android:layout_width="match_parent"
    android:layout_height="500dp"
    android:src="@drawable/bgverde"/>
</RelativeLayout>