How CASA is Restoring the Lingadzi River with Drone Data

Problem:

The Center for Applied Systems Analysis (CASA) needed accurate, up-to-date geospatial data to support restoration planning for the Lingadzi River riparian corridor in Lilongwe.
Traditional satellite imagery lacked the detail required for terrain analysis, vegetation mapping, and hydrological planning. The corridor, spanning from Mtandire Bridge to Area 14, is ecologically sensitive and densely populated requiring a high-precision, low-impact survey method.

Solution:

Cage conducted a full-scale high-resolution drone survey of the Lingadzi River corridor, covering areas over Mtandire Bridge all the way to Area 14. Using professional-grade UAVs, we captured terrain and surface data at 50cm per pixel, along with 1-meter contour intervals to support topographic modeling. We also produced an ultra-detailed orthomosaic at up to 5cm /px resolution, suitable for both spatial analysis and visual documentation. Our drone-based approach enabled rapid capture of difficult-to-access terrain while complying with all CAA airspace regulations and minimizing disruption to the surrounding communities

Results:

Riparian corridor mapped with high-resolution orthophotos and topographic data.
CASA now using the data to model erosion risks, identify restoration zones, and guide long-term riparian management
Drone-based approach completed the survey 3x faster than traditional ground methods and eliminated the need for field-based terrain modeling

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