Night cities tutorial

Find 3 places 

You will find 2 images. The ISS image will be loaded in the left panel, a map on the right.

The ISS image will be loaded in the left panel and a map on the right one:


The goal is to identify at least 3 places of the city showed on the left in the map showed in the centre. The farther away the places, the better.

The map can be rotated by pressing shift and clicking the left mouse button.


The map has 3 layers. You can load any of them by clicking the “+” symbol at the top right corner of the map. Over there you will find 4 options: Google satellite, google streets, open street map and VIIRS but since google engine stopped working the VIIRS is no longer available.




The images and the map can be zoom in and out clicking in the “+” and the “-” symbols at the top left of each one. Let’s dragged the map to Barcelona and zoom in. Select a point in the image. The pixel will appear at the right:


Then select the same point in the map. The coordinates will appear as well at the right. If you make a mistake you can click on “remove selected”


Now let’s do the same with Castellón de la Plana and Palma de Mallorca:



Finally press Save. If the picture is not a night city click “No photo”. If you cannot find where it belongs click “I don’t know” If you need it you will find more information about the city by clicking on: “ISS picture data ”


Try application