Handle missing elevation data

GIScience / Leaflet.Heightgraph

Leaflet plugin to visualize height information and road attributes.

MIT License

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Open nrenner opened 3 years ago

nrenner commented 3 years ago

Fixes #108

shows missing elevation values as gap in the graph using a d3 defined accessor function
the height value in the focus box is shown as "-" (hyphen) when undefined