Using machine learning to predict roof type
December, 2017

Building on previous work to identify sprayable structures, the DiSARM team is developing a new ensemble machine learning algorithm to predict a structure’s roof type based on satellite imagery.

Roof type is related to both building type (e.g. buildings with tile or thatch roofs are more likely to be residential) and wall type (e.g. buildings with thatched roofs are more likely to have walls made of natural materials like mud); further, wall type strongly influences the insecticide used for indoor residual spraying (IRS). This has important applications for the work that the DiSARM team is already doing and for new capabilities that we hope to bring to the platform.

Adding the roof type prediction probabilities to the building type algorithm improved its accuracy by a few percentage points – while this doesn’t seem like much of an improvement, it translates to thousands more structures being classified correctly, which in turn can lead to savings in time and money for IRS teams.

Accurate prediction of wall type from roof type would potentially result in further gains in efficiency for IRS teams. If we can predict wall type using satellite imagery of roofing materials, IRS teams could better plan how much and which insecticides are needed for a given campaign. This prediction capability could also be potentially expanded to predict other features of a building that could help in IRS planning, like number of rooms and surface area.

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