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A light level geolocator, light-level logger or global location sensor ( GLS) is a lightweight, electronic archival tracking device, usually used in bird migration research to map migration routes, identify important staging areas, and sometimes provide additional ecological information. A geolocator periodically records ambient light level ...
Globe at Night is an international scientific research program that crowdsources measurements of light pollution in the night sky. At set time periods within each year, the project asks people to count the number of stars that they can see from their location and report it to the project's website. The coordinating researchers compile this ...
Bortle scale. The Bortle dark-sky scale (usually referred to as simply the Bortle scale) is a nine-level numeric scale that measures the night sky 's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution.
Locator map. In cartography, a locator map, or just a locator, is typically a simple map used to show the location of a particular geographic region within its larger and presumably more familiar context. Depending on the needs of the cartographer, this type of map can be used on its own or as an inset or addition to a larger map.
The birds' habit of returning to the same territory each year allows scientists in Hawaiʻi to attach tiny light level geolocator devices to the birds and retrieve them the following year in the same location. Such research showed that the birds made the 3,000 mi (4,800 km) nonstop flight between Alaska and Hawai'i in 3–4 days.
Animal migration tracking is used in wildlife biology, conservation biology, ecology, and wildlife management to study animals' behavior in the wild. One of the first techniques was bird banding, placing passive ID tags on birds legs, to identify the bird in a future catch-and-release. Radio tracking involves attaching a small radio transmitter ...
Pop-up satellite tags range in length from about 125–215 mm (4.9–8.5 in) and weigh 36-108 grams in air. A tag must be small compared to the size of the animal, anywhere from 3-5% of the total fish weight, so that it does not interfere with normal behavior. These tags record information such as temperature, magnetics, acceleration, light ...
Using a tiny light-level geolocator biologists have proven that the black poll flies an average of 2540 km (2270 to 2770 km) non-stop over an average of 62 h, up to 3 days, corresponding to about 41 km/h. In 2013, 37 blackpolls from Vermont and Nova Scotia carried a miniaturized geolocator weighing 0.5 g with the harness on their back.