Systems, methods, and software for detecting bed boundary locations are described. In some aspects, the boundaries of a subsurface layer are identified based on a measurement from a logging point and a gradient associated with the measurement from the logging point. A first measurement is generated based on operating a transmitter and a receiver of a resistivity logging tool at a first tool depth. The gradient is calculated from the first measurement and a second measurement. The second measurement is generated based on operating the transmitter and the receiver of the resistivity logging tool at a second, different tool depth.
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