Methods and systems for identifying navigable elements affected by weather conditions

A system, for determining whether one or more navigable elements of a navigable network within a geographic area are still affected by a precipitation weather event, the navigable elements being represented by one or more segments of an electronic map, wherein at least some of the segments of the electronic map are each associated with data indicative of a quantity parameter for the segment, the quantity parameter being indicative of an amount of precipitation remaining on the navigable element or portion thereof represented by the segment, wherein a value of the quantity parameter varies according to a predefined function with respect to time such that the quantity parameter decreases in an absence of any precipitation weather event, said system comprising one or more processors arranged to:

• obtain weather data indicative of one or more precipitation weather events in the geographic area, wherein each precipitation weather event affects at least a portion of the geographic area;
• obtain positional data relating to movements of a plurality of devices along one or more of the navigable elements with respect to time, and using the positional data to determine a speed of travel of devices from among the plurality of devices along the one or more navigable elements;
• identify one or more segments representative of navigable elements within the portions of the geographic area affected by the one or more precipitation weather events, and increasing, for each of the one or more identified segments, the value of the quantity parameter associated with the segment;
• compare, for each of the one or more identified segments, the determined speed of travel to an expected speed of travel for the segment, and decreasing the value of the quantity parameter associated with the segment based on the comparison;
• and
• generate, for each of the one or more identified segments, data indicative of whether the navigable element or portion thereof represented by the segment is still affected by the one or more precipitation weather events based on the value of the quantity parameter;
• wherein the predefined function that causes the quantity parameter to decrease in the absence of any precipitation weather event is based on current temperature data.