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Table 1 Environmental variables that describe hydrological and land surface conditions of the study area.

From: A study of the distribution and abundance of the adult malaria vector in western Kenya highlands

Variable

Calculation

Wetness Index

Calculated based on the local upslope contributing area and slope

Distance to High Order Stream

Stream orders are calculated based on the reaches of a stream. A high order stream is reached by streams ordered four or five.

Distance to Low Order Stream

A low order streams is reached by streams ordered one, two, three and four. It also may not be reached by other streams.

Elevation

Derived from Digital Elevation Model

Slope

Calculated as the rate of change in altitude