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Topic Review
Level Mountain
Level Mountain is a large volcanic complex in the Northern Interior of British Columbia, Canada. It is located 50 kilometres (31 miles) north-northwest of Telegraph Creek and 60 kilometres (37 miles) west of Dease Lake on the Nahlin Plateau. With a maximum elevation of 2,164 metres (7,100 feet), it is the second-highest of four large complexes in an extensive north–south trending volcanic region. Much of the mountain is gently-sloping; when measured from its base, Level Mountain is about 1,100 metres (3,600 feet) tall, slightly taller than its neighbour to the northwest, Heart Peaks. The lower, broader half of Level Mountain consists of a shield-like structure while its upper half has a more steep, jagged profile. Its broad summit is dominated by the Level Mountain Range, a small mountain range with prominent peaks cut by deep valleys. These valleys serve as a radial drainage for several small streams that flow from the mountain. Meszah Peak is the only named peak in the Level Mountain Range. The mountain began forming about 15 million years ago, with volcanism having continued up until geologically recent times. There have been four stages of activity throughout the long volcanic history of Level Mountain. The first stage commenced 14.9 million years ago with the eruption of voluminous lava flows; these created a large shield volcano. The second stage began 7.1 million years ago to form a structurally complicated stratovolcano located centrally atop the shield. A series of lava domes was established during the third stage, which began 4.5 million years ago. This was followed by the fourth and final stage with the eruption of lava flows and small volcanic cones in the last 2.5 million years. A wide range of rock types were produced during these stages, namely ankaramites, alkali basalts, trachybasalts, mugearites, hawaiites, phonolites, trachytes and rhyolites. Alkali basalts and ankaramites are the most voluminous and comprise much of Level Mountain. The remaining rock types are less extensive and are largely restricted to the central region of the volcanic complex. Several types of volcanic eruptions produced these rocks. Level Mountain lies in one of many ecoregions encompassing British Columbia. It can be ecologically divided into three sections: lodgepole pine and white spruce forests at its base, bog birch and subalpine fir forests on its flanks, and an alpine climate at its summit. The extent and flatness of the alpine on Level Mountain have produced many Arctic affinities that are particularly noticeable in the local biota. Several animal species thrive in the area of Level Mountain, with caribou being the most abundant. A trading post was established at Level Mountain in the 1890s, followed by geological studies of the mountain from the 1920s onwards. This remote area of Cassiar Land District has a relatively dry environment compared to the Coast Mountains in the west. Due to its remoteness, Level Mountain can only be accessed by air or by trekking great distances on foot. The closest communities are more than 30 kilometres (19 miles) away from the mountain.
  • 524
  • 02 Nov 2022
Topic Review
High Resolution Wide Swath SAR Imaging
High Resolution Wide Swath (HRWS) imaging is an important branch in Synthetic aperture radar (SAR) imaging, a remote sensing technique capable of providing high resolution images independent of weather conditions and sunlight illumination. This makes SAR very attractive for the systematic observation of dynamic processes on the Earth's surface, which is useful for environmental monitoring, earth resource mapping and military systems. SAR technology has provided terrain structural information to geologists for mineral exploration, oil spill boundaries on water to environmentalists, sea state and ice hazard maps to navigators, and intelligence, surveillance, reconnaissance and detecting information to military operations. Conventional SAR systems are limited in that a wide swath can only be achieved at the expense of a degraded azimuth resolution. Since wide coverage swaths and high resolution output are both important, this poses challenges and contradicting requirements on the design of space-borne SAR systems and related new algorithms.
  • 399
  • 01 Nov 2022
Topic Review
Geomatics
Geomatics is defined in the ISO/TC 211 series of standards as the "discipline concerned with the collection, distribution, storage, analysis, processing, presentation of geographic data or geographic information". Under another definition, it "consists of products, services and tools involved in the collection, integration and management of geographic data". It includes geomatics engineering (and surveying engineering) and is related to geospatial science (also geospatial engineering and geospatial technology).
  • 536
  • 01 Nov 2022
Topic Review
ISPRS International Journal of Geo-Information
The International Society for Photogrammetry and Remote Sensing (ISPRS) is an international non-governmental organization that enhances international cooperation between the worldwide organizations with interests in the photogrammetry, remote sensing and spatial information sciences. Originally named International Society for Photogrammetry (ISP), it was established in 1910, and is the oldest international umbrella organization in its field, which may be summarized as addressing “information from imagery”. ISPRS achieves its aims by: The ISPRS' scientific and technical programs are organized by five technical commissions. Each commission is sponsored by an ISPRS member organization for the four-year period between congresses. The five technical commissions have established around 60 working groups which are responsible for particular topics within the commissions’ areas of interest. All technical commissions hold a symposium within their country in 2018. Smaller workshops will be organized by the working groups before the 2020 congress from June 28 - July 4, 2020, in Nice, France, by the French Society for Photogrammetry and Remote Sensing.
  • 347
  • 01 Nov 2022
Topic Review
UC Berkeley College of Natural Resources
The College of Natural Resources (CNR), a college of the University of California, Berkeley, is the oldest college in the UC system and home to several internationally top-ranked programs. CNR's Department of Agriculture & Economics is considered to be one of the most prestigious schools in agricultural economics in the world, ranking #1 according to the Journal of Agricultural and Applied Economics, #1 by the Chronicle of Higher Education, #1 by Perry for its Ph.D. programs and in International Trade, #1 by the National Research Council in Agricultural & Resource Economics, and #1 by U.S. News in Environmental/Environmental Health. In environmental disciplines, QS World Rankings recognizes the University of California, Berkeley, as the world's leading university in Environmental Studies with 100 points in Academic Reputation. U.S. News also ranks it as the best global university for environment and ecology. A study of AJAE authors and their university affiliations found it to have the highest number of pages per research faculty member. Established in 1868 as the College of Agriculture under the federal Morrill Land-Grant Acts, CNR is the first state-run Agricultural Experiment Station. The college is home to four academic departments: Agriculture and Resource Economics; Environmental Science, Policy, and Management; Nutritional Sciences and Toxicology; and Plant and Microbial Biology, and one interdisciplinary program, Energy and Resources Group. Faculty include 40 Fulbright Fellows, 30 American Association for the Advancement of Science Fellows, 19 National Academy of Sciences members, 12 Guggenheim Fellows, 9 American Academy of Arts and Sciences members, 7 MacArthur Fellows, 4 Nobel Laureates, 3 Wolf Prize winners, and 2 World Food Prize winners. The Dean of the College is Prof. David Ackerly.
  • 417
  • 01 Nov 2022
Topic Review
1888 Ritter Island Tsunami
On the morning of March 13, 1888, an explosion took place on Ritter Island, a small volcanic island in the Bismarck and Solomon Seas, between New Britain and Umboi Island. This event is the largest volcanic island sector collapse in recent history. The explosion resulted in the almost complete loss of the island and generated a tsunami with runups of up to 20 meters (66 ft) that caused damage more than 600 kilometers (370 mi) away and killed anywhere between 500 and 3,000 on neighbouring islands, including scientists and explorers.
  • 403
  • 01 Nov 2022
Topic Review
Societal Benefit Areas
The Societal Benefit Areas (SBAs) are eight environmental fields of interest, all of which relate to climate, around which the Global Earth Observation System of Systems (GEOSS) project is exerting its efforts. These include: Biodiversity and Ecosystem Sustainability, Disaster Resilience, Energy and Mineral Resources Management, Food Security and Sustainable Agriculture, Infrastructure and Transport Management, Public Health Surveillance, Sustainable Urban Development, and Water Resources Management around which a preliminary hierarchical vocabulary has been created. One of the aims of GEOSS is to implement a proper system of Earth monitoring and to render information deriving from this process available to a global range of users. Currently, the hierarchical vocabulary structuring these societal benefit categories and their subcategories are available only in English. However, translations have been created for French, Spanish and Italian versions by Claudia Cialone and Kristin Stock of the Centre for Geospatial Science (CGS) at the University of Nottingham, UK, with input from a number of people from the Consiglio Nazionale delle Ricerche (CNR) in Italy, the University of Zaragoza and the European Union Joint Research Centre (JRC). Translations have also been accomplished for a Slovenian version of the SBAs by the Biotehnical faculty of the University of Ljubljana, SI.
  • 244
  • 01 Nov 2022
Topic Review
Vilabouly Complex, Laos
The Vilabouly Complex is an archaeological site that is located in the Savannakhet Province in Laos which holds copper smelting and copper mining during the Iron Age. The Vilabouly Complex is significant since it puts archaeologists in a predicament of when did the origin of bronze metallurgy begin in Southeast Asia. It was estimated that the site was around 400BC - AD 500 as well as 1000 - 400BC reaching both the Iron Age and Bronze Age of Southeast Asia. The site contained a lead signature that followed copper, bronze alloys, and bronze which signifies a massive source of material that can benefit metallurgy in the region. By this, the Vilabouly Complex will hold all the power of the region since it has all the resources to advance their technology during the Bronze and Iron Ages. The Vilabouly Complex and the region contained such mining sites such as Dragon Field, Peun Balo, Tengkham South D, Khanong A2, and the Malachite Cave. These sites all refer to the Iron Age but Peun Balo revealed mining in the Bronze Age continuing the predicament for Archaeologists. Research like this is vital for the Vilabouly Complex to find and understand the exact date to when the people of Southeast Asia are trading metals, and sharing mining techniques. There are also other sites in region such as the Prachan Valley that shared a lot of similarities to that of the Vilabouly Complex revealing continuities for the Southeast Asian people.
  • 253
  • 01 Nov 2022
Topic Review
Jeannette Expedition
The Jeannette Expedition of 1879–1881, officially called the U.S. Arctic Expedition, was an attempt led by George W. De Long to reach the North Pole by pioneering a route from the Pacific Ocean through the Bering Strait. The premise was that a temperate current, the Kuro Siwo, flowed northwards into the strait, providing a gateway to the Open Polar Sea and thus to the pole. This theory proved illusory; the expedition's ship, USS Jeannette and its crew of 33, was trapped by ice and drifted for nearly two years before she was crushed and sunk, north of the Siberian coast. De Long then led his 32 men on a perilous journey by sled, dragging the Jeannette's whaleboat and two cutters, eventually switching to these small boats to sail for the Lena Delta in Siberia. During this journey, and in the subsequent weeks of wandering in Siberia before rescue, 20 of the ship's complement died, including De Long. The chief exponent of the theory of a warm-water gateway to the North Pole was the German cartographer August Petermann. He encouraged James Gordon Bennett Jr., the proprietor of the New York Herald, to finance a polar expedition based on the untried Pacific route. Bennett acquired a former Royal Navy gunboat, the Pandora, and changed her name to Jeannette. De Long, whom Bennett chose to lead the expedition, was a serving naval officer with previous Arctic experience. Although essentially a private venture, in which Bennett paid all the bills, the expedition had the full support of the U.S. Government. Before departure the ship was commissioned into the U.S. Navy as USS Jeannette, and sailed under navy laws and discipline. Before its demise, the expedition discovered new islands—the De Long Islands—and collected valuable meteorological and oceanographic data. Although Jeannette's fate demolished the widely believed Open Polar Sea theory, the appearance in 1884 of debris from the wreck on the south-west coast of Greenland indicated the existence of an ocean current moving the permanent Arctic ice from east to west. This discovery inspired Fridtjof Nansen to mount his Fram expedition nine years later. A monument to the Jeannette's dead was erected at the United States Naval Academy in Annapolis, in 1890.
  • 581
  • 01 Nov 2022
Topic Review
Degua Tembien
Dogu'a Tembien (Template:Lang-ti, "Upper Tembien", sometimes transliterated as Degua Tembien) is one of the woredas in the Tigray Region of Ethiopia. It is named in part after the former province of Tembien. Nowadays, the mountainous district is part of the Southeastern Tigray Zone. The administrative centre of this woreda is Hagere Selam.
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  • 01 Nov 2022
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