Agricultural Drones in Sri Lanka: An Educational Guide

A mapping drone over a field produces more than pretty pictures. Multispectral sensors measure light reflected in bands the eye cannot see, and vegetation indices computed from them reveal stress, disease and irrigation problems before they are visible from the ground. For plantation crops, regular aerial surveys support tree counting, gap analysis and replanting decisions across terrain that is slow to walk. These sensing applications use the same photogrammetry workflow described in the drone mapping guide.

Spray drones carry liquid tanks and apply agrochemicals along programmed swaths, a use case growing rapidly across Asia. In Sri Lanka, operators should note that CAASL's general operating rules prohibit carrying goods or dropping items from drones, which means agricultural application work requires specific engagement with CAASL rather than an assumption that standard approval covers it. The regulatory status of routine drone spraying in Sri Lanka should be confirmed directly with CAASL and the agricultural authorities before any commercial offering is built on it.

Status: spraying operations require verification with CAASL; do not assume standard approvals cover the carriage and release of substances.

The pragmatic entry point is sensing on plantations and paddy schemes: registered equipment, standard approvals for the estate area, landowner arrangements that are usually simple on private agricultural land, and outputs, such as orthomosaics and index maps, that agronomists can act on. Estates near wildlife reserves or tanks used by birdlife should factor in environmental sensitivities, and hill-country tea estates add the terrain and weather judgement covered in the location guides.