UAV DEM and RTK Surveyed High-Water Marks for Flood Modeling in Nepal

The Bagmati–Nakkhu confluence area in Lalitpur Metropolitan City, Nepal, is the focus of this dataset. It contains a 0.5 m resolution UAV-derived Digital Elevation Model and RTK-surveyed flood mark points from a 2024 flood event. The data was generated by Rishav Khatiwada for a study submitted to the ISPRS International Journal of Geo-Information.

Use Cases

• Calibrating hydraulic flood simulation models based on the RTK-surveyed high-water mark elevation data
• Generating high-resolution terrain inputs for flood inundation mapping based on the 0.5 m UAV-derived DEM
• Validating event-based flood model predictions against ground-truth flood mark points
• Analyzing terrain characteristics at a river confluence for hydrological studies based on the DEM

Strengths

• Includes a high-resolution Digital Elevation Model at 0.5 m spatial resolution
• Contains ground-truth elevation data from a Real-Time Kinematic (RTK) survey
• Data is georeferenced using Ground Control Points (GCPs) for accuracy
• The dataset is licensed under CC-BY-4.0 for open use

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment
• The dataset's 8.3 MB size suggests a limited geographic scope

Provenance

Source

figshare

Collection Method

Generated from UAV photogrammetric surveys and RTK field surveys.

Time Range

UAV survey conducted 26–27 April 2025; RTK survey conducted 7 May 2025; data references the 27 September 2024 flood event.

Freshness

Last updated 2026-04-25 12:49:52; freshness should be verified

Geography

Bagmati–Nakkhu confluence area, Lalitpur Metropolitan City, Nepal.