Study Area:

The “Airborne LiDAR Survey and Mapping of Namlan Khola and Upper Mugu Khola Hydroelectric Projects” covers an area of 200 square kilometers in the Mugu District of Nepal. This region, characterized by rugged and varied terrain, is critical for the development of the Namlan Khola and Upper Mugu Khola Hydroelectric Projects, including their associated transmission line corridors.

The study area encompasses diverse topographical features such as steep slopes, river valleys, and elevated ridges. The hydrological and geological complexity of the region necessitates detailed topographic mapping to support the design and construction of hydroelectric infrastructure and transmission lines. The project area includes both the hydroelectric project sites and the transmission line corridors, which require precise elevation data for effective planning and management.

 Project Objectives:

– Establishment of Control Points: Utilize GNSS (DGPS) technology to establish control points across the project area. This process ensures accurate alignment and integration of the survey data.

– Conduct Airborne LiDAR Survey: Perform an airborne LiDAR survey using helicopter technology to capture detailed elevation data across the 200 sq. km area. The primary goal is to generate high-resolution topographic information to support the hydroelectric projects and transmission line planning.

– Preparation of Topographic Map: Produce a topographic map with a contour interval of 1 meter to provide a precise representation of the terrain. This map will be crucial for the design and construction of the hydroelectric projects and related infrastructure.

– Orthomap Preparation: Generate orthomaps at a scale of 1:5000 in a grid of 2.5 km by 2.5 km. The orthomaps will have Ground Sampling Distances (GSD) of 10 cm, 1 m, and 2.5 m to cater to various levels of detail and analysis requirements.

 Deliverables:

– Ortho Photos: High-resolution orthophotos will be created to provide an accurate, geo-referenced view of the study area. These images will support detailed analysis and planning.

– Contour Maps: Detailed contour maps will be prepared with a 1-meter contour interval, illustrating the elevation changes across the project area. These maps are essential for understanding the terrain and guiding project design.

– Digital Surface Models (DSM): DSMs will represent the earth’s surface, including all natural and man-made features. This model provides a comprehensive view of the surface characteristics within the project area.

– Digital Terrain Models (DTM): DTMs will be developed to depict the bare ground surface, excluding vegetation and structures. This model is crucial for understanding the true landform and planning construction activities.

– Topographical Maps: Comprehensive topographical maps will be generated to offer a detailed overview of the terrain, including elevation contours and surface features. These maps are vital for the effective planning and execution of the hydroelectric projects and transmission line corridors.

The airborne LiDAR survey for the Namlan Khola and Upper Mugu Khola Hydroelectric Projects will provide high-resolution and accurate topographic data necessary for successful project planning and execution. The deliverables will support various aspects of the projects, ensuring alignment with the terrain and project requirements.