One of the most powerful online tools at your disposal is the sprawling Google Earth project, which allows you to use ...

At a recent GIJN webinar, three experts explained how reporters can get regular, free access to high-quality satellite images ...

Of course, you also need to know the diameter and height of a tank. Diameter is easy, just use Google Earth’s ruler tool. Height is a bit more tricky, but can often be determined by just ...

5. Select the unit of measurement you want to use from the dropdown. You'll see a yellow line appear on the map and the measurement will show up in the ruler portion of the Google Earth Pro window.