Shadow Mapping

Septima Skyggekort is an interactive map which visualizes the shadows cast past times Denmark's buildings at whatever lx minutes of the twenty-four hours as well as for whatever twenty-four hours of the year.

The map was created using the OpenLayers mapping library using acme information from Styrelsen for DataForsyning og Effektivisering, the populace information agency of the Danish government. The acme information appears to come upward from a Lidar survey of the whole of Denmark. This agency that you lot tin dismiss purpose the map to sentiment the length as well as positions of shadows for whatever edifice as well as for whatever tree inwards the whole country. Just purpose the 2 slider controls on the map to choose the twenty-four hours of the twelvemonth as well as the fourth dimension of the twenty-four hours you lot wishing to encounter visualized on the map.


Norway's The Shadow Visualization Demo is only about other impressive demonstration which shows dynamic shadows on an interactive map. This map uses digital terrain model information as well as edifice acme information from OpenStreetMap. Because the map knows the acme of the terrain this map non entirely shows the shadows of buildings but the shadows cast past times hills as well as mountains every bit well.

Again you lot tin dismiss purpose the slide controls to choose whatever fourth dimension of twenty-four hours as well as whatever twenty-four hours of the year.

In New York you lot tin dismiss purpose the New York Times' Mapping the Shadows of New York City interactive map to visualize the shadows cast past times the city's famous heaven scrapers (and all of its other buildings every bit well.)

The Times says that around Manhattan neighborhoods volition rest inwards shadow for at to the lowest degree one-half of all daylight hours. They besides claim that the total of fourth dimension a place spends inwards shadow during daylight hours tin dismiss impact everything from bird rental prices to the menses of pes traffic on the city's streets.

The map uses edifice acme information provided past times the city. With the help of the Tandon School of Engineering at New York University the NYT used this acme information to calculate the full expose of minutes that a given betoken spends inwards shadow over the course of teaching of a day.

If you lot are interested inwards creating your ain shadow map thus you lot mightiness survive interested inwards SunCalc.js, a javascript library for calculating the set of the sun.