Honeywell IntuVue RDR-4000 Pilot's Manual page 6

Automatically corrects for curvature of the earth.
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Pilots can choose among display options as desired.
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
Internal Topography Database
Used to remove ground clutter from weather displays and to
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remove weather returns from the MAP display.

More sensitive weather detection for more accurate weather depiction
Improved long-range performance.
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3D scanning detects more weather close to the aircraft as
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compared to other weather radar systems.

Differentiation of weather in and out of path of the aircraft
In ALL or ALL WX mode, weather that is far above or below the
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aircraft's flight path (Off Path) is displayed in a different pattern
than On Path weather.
In ON PATH or PATH WX mode, the display of weather that is
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Off Path is suppressed. Only the weather that is relevant to the
flight path is shown.
In ELEVN mode, view horizontal slices through the weather in
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1,000-foot increments, from ground level to 60,000 ft.

Weather/Turbulence Ahead Alerting
Alerts the pilot when significant weather or turbulence is detected
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on the flight path trajectory.

Map mode for identification of terrain features
Use MAP mode for identifying prominent terrain features, such as
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coastlines, lakes, and large built-up urban areas.
The RDR-4000 is a technically advanced system, but as always, there
are physical limitations to consider.

The use of a topography database results in a significant reduction in
ground returns. However, the database is not aware of man-made
reflectors such as buildings at airports and cities. Therefore, it is
possible that not all ground clutter will be eliminated.

The antenna beam is very narrow at close ranges and widens
significantly with range. Therefore, the resolution and accuracy of
weather reflectivity is better at ranges closer to the aircraft.
Introduction
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IntuVue RDR-4000 Weather Radar Pilot's Guide
D201002000008
Rev 1, December 2014