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Historic carbon dioxide decline could hold clues for future climate
By Lurker,
A new study led by researchers at The Australian National University (ANU) provides a clearer snapshot of conditions during the last ice age—when global ice sheets were at their peak—and could even lead to better models for future climate projections.
The study demonstrates a new way of recreating ocean conditions in the Atlantic during the Last Glacial Maximum (LGM)—around 20,000 years ago.
Lead author Dr. Jimin Yu says scientists have been trying to reconstruct ocean ci
Remote Sensing uncover widespread illegal fishing in Pacific Ocean
By Lurker,
Scofflaw ships hauled in more than 176,000 tons of Pacific flying squid in North Korean waters in 2017 and 2018.
A 55- to 60-meter lighting vessel of Chinese origin near North Korean waters. This vessel had its four arm-like structures deployed and flew both North Korean and Chinese flags.
Satellite imagery has dragged "dark" fishing fleets out into the light.
Orbital observations have revealed extensive illegal fishing of Pacific flying squid (Todarodes pacificus) i
Marine Species are Shifting Towards the Poles
By Lurker,
Global warming has caused a shift in species’ ideal habitats, prompting everything from mushrooms to trees, mammals to amphibians and other terrestrial species to seek out different ecological zones in which to thrive. New research is collecting data on marine species that are also experiencing climate related habitat migrations in greater numbers than scientists anticipated.
As species’ normal habitats are becoming warmer, habitat is lost due to human infrastructure, or habitats are becomi
UrsaNav installs eLoran testbed in South Korea
By Lurker,
South Korean is in the early stages of evaluating its eLoran system, but great results are expected based on the UrsaNav-supplied station in Incheon.
In August 2018, the Korea Research Institute of Ships and Oceans Engineering (KRISO) awarded UrsaNav, through its agent Dong Kang M-Tech, a contract to supply and install an eLoran transmitter testbed system in South Korea. UrsaNav is the exclusive, worldwide distributor of Nautel’s NL Series transmitters, provided eLoran transmitter tec
Create Interactive Flow Maps
By Lurker,
Flow maps are cartographic visualizations to show the movement of objects, people, or other living things from one location to another. Lines, usually symbolized with an arrow to indicate the direction. Color coding or line width can also then be used to indicate the volume of objects that are moving from one location to another. Airline traffic, animal migration, commuters, and import/exports are all common types of geographic data that are typically shown on a flow map .
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Hello folks! I am trying to use the Lyzenga Algorithm for estimating the depth of water in shallower areas, probably depths under 8-10 meters of lakes. First of all, how accurate is this algorithm in practice? Secondly, lets say i have the band values. can someone explain me how to retrieve those depths? I am following the "Lyzenga Algorithm for Shallow Water Mapping Using Multispectral Sentinel-2 Imageries in Gili Noko Waters" paper, but there are 3 steps of getting NDWIs, NDCIs and after filtering the Sun Glint Correction, then it finally comes to the depth calculating. it end ups in a formula of following: 𝑧 = 28.32 ∗ 𝑋1 − 36.25 ∗ 𝑋2 + 9.42 ∗ 𝑋3 + 16.35 x1 , x2, x3 are RGB values respectively. What do you guys think? can i just apply this formula ? if not, what is the purpose of all the previous steps, and will they change the rgb values anyways? -
Hello folks! I am trying to use the Lyzenga Algorithm for estimating the depth of water in shallower areas, probably depths under 8-10 meters of lakes. First of all, how accurate is this algorithm in practice? Secondly, lets say i have the band values. can someone explain me how to retrieve those depths? I am following the "Lyzenga Algorithm for Shallow Water Mapping Using Multispectral Sentinel-2 Imageries in Gili Noko Waters" paper, but there are 3 steps of getting NDWIs, NDCIs and after filtering the Sun Glint Correction, then it finally comes to the depth calculating. it end ups in a formula of following: 𝑧 = 28.32 ∗ 𝑋1 − 36.25 ∗ 𝑋2 + 9.42 ∗ 𝑋3 + 16.35 x1 , x2, x3 are RGB values respectively. What do you guys think? can i just apply this formula ? if not, what is the purpose of all the previous steps, and will they change the rgb values anyways?
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