Nanocad's Topoplan module enhances the nanocad platform with tools for digital terrain modeling, aiding surveyors with features such as advanced surface creation, support for Civil 3D objects, and multiple data sources for terrain models. The module includes tools for mesh simplification, elevation coloring, and a variety of import/export options for geospatial data. Additional functionalities allow for contour construction and relief handling, making it a comprehensive tool for terrain analysis and documentation.