simple_nkde(graph, events, samples, bws, kernel_func, nodes, edges, div = "bw")
Arguments
graph
a graph object from igraph representing the network
events
a feature collection of points representing the events. It must be
snapped on the network, and be nodes of the network. A column vertex_id
must indicate for each event its corresponding node
samples
a a feature collection of points representing the sampling points.
The samples must be snapped on the network. A column edge_id must indicate
for each sample on which edge it is snapped.
bws
a vector indicating the kernel bandwidth (in meters) for each
event
kernel_func
a function obtained with the function select_kernel
nodes
a a feature collection of points representing the nodes of the network
edges
a a feature collection of linestrings representing the edges of the network
div
The divisor to use for the kernel. Must be "n" (the number of events within the radius around each sampling point), "bw" (the bandwidth) "none" (the simple sum).
Value
a dataframe with two columns. sum_k is the sum for each sample point
of the kernel values. n is the number of events influencing each sample
point