'Shade Map' that allows you to clearly recognize in 3D how the shadows of mountains change from moment to moment

Tppiotrowski has created a 'Shade Map ' that allows you to check how the shadows of a mountain grow over time and disappear into the darkness of the night on a 3D map. According to the author, 'Shade Map' is created using WebGL.

View Shade on a Map --Shade Map

'Shade Map' is a tool that uses Google Maps, and the operation method is the same as Google Maps. You can zoom in and out on the map with the '+' and '-' buttons at the bottom right of the screen or with the mouse wheel, and you can move the display position by dragging the map.

When you enlarge the screen, it looks like this. At the time of writing the article, only the shadows created by natural objects such as mountains are displayed in gray.

By moving the slide bar at the bottom of the screen left and right, it is possible to change the time when the shadow is formed. For example, the following is the state of the Grand Canyon around 2:58 on January 7, 2022 in Japan time ...

The following is the state around 7:59. By moving the slide bar, you can see how the shadow grows over time. The yellow part on the timeline indicates the 'time when the sun is shining' at the place displayed on the map.

Furthermore, if you click the '3D' button at the bottom right of the screen ...

You can change the map to 3D display. This allows you to see the shadows extending from the mountain in a more three-dimensional manner.

You can also freely change the shadow color by clicking the red frame.

The map is basically designed so that the north is directly above, but you can freely change the direction of the map by clicking and dragging the button in the red frame part.

So, if you actually use 'Shade Map' to check various shadows extending from the mountain, it will look like the following movie.

'Shade Map' that shows how the shadows extending from the mountain change with time --YouTube

In addition, the shadow part looks very large, but according to the author, the shadow in 'Shade Map' is 'the part that direct sunlight does not reach', so it feels larger than the shadow actually seen outdoors. It seems that it is.

in Review,   Web Application,   Video, Posted by logu_ii