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Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.

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  • Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.
  • Sea level is generally used to refer to mean sea level (MSL), an average level for the surface of one or more of Earth's oceans from which heights such as elevations may be measured. MSL is a type of vertical datum – a standardised geodetic reference point – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured in order to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is the midpoint between a mean low and mean high tide at a particular location.
  • Nível médio do mar (NMM) (do inglês MSL: Mean Sea Level), por vezes denominado simplesmente nível do mar, é a altitude média da superfície do mar. O NMM possui muitas aplicações. É, por exemplo, utilizado como referência para se mensurar as altitudes dos acidentes topográficos, especificar curvas de nível e suas cotas (nos mapas e plantas cartográficas) etc.
  • 海面(かいめん)とは、一般には海洋の水面、表面(海水面)。海水面は、測地学的には海洋の平均的な高さ(平均海水面)を示す。 大気と海洋とは、その境界面である海面を通して、熱(潜熱、顕熱)および運動量(風応力)等の形でエネルギーをやりとりしており、海洋物理学、気象学の観点から非常に重要な場となっている。
  • Le niveau de la mer est la hauteur moyenne de la surface de la mer, par rapport à un niveau de référence suffisamment stable.
  • متوسط مستوى سطح البحر (MSL) هو مقياس لمتوسط ارتفاع سطح المحيط (مثل نقطة المنتصف ما بين ارتفاع المد ومتوسط الجزر المنخفض); ويستخدم كمعيار لحساب ارتفاع الأرض. كما يلعب متوسط مستوى سطح البحر دورًا في الملاحة, حيث يستخدم ضغط مستوى سطح البحر المعياري كمرجع لقياس ارتفاع مستويات الطيران.
  • Se denomina nivel del mar al que sirve como referencia para ubicar la altitud de las localidades y accidentes geográficos, excepto los accidentes submarinos, que se miden por su profundidad. La unidad en que suele medirse la altura sobre el nivel del mar es el metro. Se habla pues de metros sobre el nivel del mar, abreviado m s. n. m. (forma establecida por las Academias de la Lengua y más ajustada a las normas del SI que msnm, también de amplio uso).
  • У́ровень мо́ря — положение свободной поверхности Мирового океана, измеряемое по отвесной линии относительно некоторого условного начала отсчёта. Это положение определяется законом тяготения, моментом вращения Земли, температурой, приливами и другими факторами. Различают «мгновенный», приливной, среднесуточный, среднемесячный, среднегодовой и среднемноголетний уровни моря. Для измерения и регистрации колебаний уровня моря используют мареограф.
  • Der Meeresspiegel ist das Höhen­niveau der Meeres­oberfläche. Er entspricht genähert einer Äquipotentialfläche des Erdschwerefeldes. Von einem langjährigen mittleren Meeresspiegel ist der momentane Meeresspiegel zu unterscheiden, der von Gezeiten, Wind und Wellen, Strömungen und Salzgehalt beeinflusst wird.
  • 海平面是海水的平均高度。它是通过与标准平面的高度比较来确定的,然而由于牵涉到一些复杂且困难的测量,使得精确确定海平面成为一个困难的工作。 测量海平面的仪器叫做验潮仪,一般微风所导致的海面的波浪可以通过平均的方法消除掉,潮汐所导致的海平面的升高和跌落也可以通过长时间的观测后取平均值的方法消除掉。海平面的测量总是相对于陆地的测量,因此海平面的变化可以是真正地由于海面的变化导致的,也可以是由于陆地的变化导致的。
  • Il livello del mare indica l'altezza media della superficie terrestre rispetto a quella del mare; il termine può assumere significati specifici a seconda del contesto in cui lo si utilizza.
  • Het zeeniveau is de gemiddelde hoogte van de zeespiegel (het vlak van de zee), als alle variaties die het gevolg zijn van de getijden worden weggemiddeld. Er zijn twee manieren om de hoogte van het zeewater te meten: het absolute zeeniveau ten opzichte van het middelpunt van de Aarde en het relatieve zeeniveau ten opzichte van de zeebodem. Het zeeniveau wordt als referentievlak gebruikt om hoogte aan te duiden van locaties op het land (zoals luchthavens en woonplaatsen) en van vliegtuigen in de lucht.
  • Poziom morza – punkt położony na wysokości teoretycznie równej zeru, w miejscu, gdzie morze styka się z lądem. Przyjęty w geografii i kartografii przeciętny poziom morza jest średnią wszystkich poziomów morza, wynikających z jego wahań, wywołanych takimi zjawiskami, jak falowanie czy pływy. Pod uwagę należy też wziąć dłuższe cykle wahań poziomu morza: 19-letni cykl Metona i 223-miesięczny cykl saros.
  • Mean sea lieevel (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.
  • en shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.
  • Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The lactose dimmer spherical ovulate global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.
  • Mean sea level🌍💧 (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.
  • Ye883u773727727273u3uu3u3i3892Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.
  • Sea level is dragon ball super look go to YouTube and search dragon ball super.(For other uses, see Sea level (disambiguation).) Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.
  • {{ot ing sea level is situated between Jerusalem and the Dead Sea.]] Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.
rdfs:label
  • Sea level
  • Livello del mare
  • Meeresspiegel
  • Niveau de la mer
  • Nivel del mar
  • Nível médio do mar
  • Poziom morza
  • Zeeniveau
  • Уровень моря
  • سطح البحر
  • 海平面
  • 海面
rdfs:seeAlso
has abstract
  • Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by global warming, and careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level generally refers to above mean sea level (AMSL). The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today.
  • 海面(かいめん)とは、一般には海洋の水面、表面(海水面)。海水面は、測地学的には海洋の平均的な高さ(平均海水面)を示す。 大気と海洋とは、その境界面である海面を通して、熱(潜熱、顕熱)および運動量(風応力)等の形でエネルギーをやりとりしており、海洋物理学、気象学の観点から非常に重要な場となっている。
  • Le niveau de la mer est la hauteur moyenne de la surface de la mer, par rapport à un niveau de référence suffisamment stable.
  • У́ровень мо́ря — положение свободной поверхности Мирового океана, измеряемое по отвесной линии относительно некоторого условного начала отсчёта. Это положение определяется законом тяготения, моментом вращения Земли, температурой, приливами и другими факторами. Различают «мгновенный», приливной, среднесуточный, среднемесячный, среднегодовой и среднемноголетний уровни моря. Под воздействием ветрового волнения, приливов, нагревания и охлаждения поверхности моря, колебаний атмосферного давления, осадков и испарения, речного и ледникового стока уровень моря непрерывно изменяется. Среднемноголетний уровень моря не зависит от этих колебаний поверхности моря. Положение среднемноголетнего уровня моря определяется распределением силы тяжести и пространственной неравномерностью гидрометеорологических характеристик (плотность воды, атмосферное давление и др.). Постоянный в каждой точке среднемноголетний уровень моря принимается за исходный уровень, от которого отсчитываются высоты на суше. Для отсчёта глубин морей с малыми приливами этот уровень принимается за нуль глубин — отметку уровня воды, от которой отсчитываются глубины в соответствии с требованиями судоходства. В России и большинстве других стран бывшего СССР, а также в Польше, абсолютные высоты точек земной поверхности отсчитывают от среднемноголетнего уровня Балтийского моря, определённого от нуля футштока в Кронштадте. Глубины и высоты в западноевропейских странах исчисляются по Амстердамскому футштоку (замер уровня Средиземного моря делается по Марсельскому футштоку). Для измерения и регистрации колебаний уровня моря используют мареограф. Поскольку существует множество факторов, влияющих на глобальные изменения погоды, (например, Глобальное потепление), то предсказания и оценки изменений уровня океана в ближайшем будущем не отличаются особой точностью.
  • متوسط مستوى سطح البحر (MSL) هو مقياس لمتوسط ارتفاع سطح المحيط (مثل نقطة المنتصف ما بين ارتفاع المد ومتوسط الجزر المنخفض); ويستخدم كمعيار لحساب ارتفاع الأرض. كما يلعب متوسط مستوى سطح البحر دورًا في الملاحة, حيث يستخدم ضغط مستوى سطح البحر المعياري كمرجع لقياس ارتفاع مستويات الطيران.
  • Se denomina nivel del mar al que sirve como referencia para ubicar la altitud de las localidades y accidentes geográficos, excepto los accidentes submarinos, que se miden por su profundidad. La unidad en que suele medirse la altura sobre el nivel del mar es el metro. Se habla pues de metros sobre el nivel del mar, abreviado m s. n. m. (forma establecida por las Academias de la Lengua y más ajustada a las normas del SI que msnm, también de amplio uso).
  • Der Meeresspiegel ist das Höhen­niveau der Meeres­oberfläche. Er entspricht genähert einer Äquipotentialfläche des Erdschwerefeldes. Von einem langjährigen mittleren Meeresspiegel ist der momentane Meeresspiegel zu unterscheiden, der von Gezeiten, Wind und Wellen, Strömungen und Salzgehalt beeinflusst wird.
  • 海平面是海水的平均高度。它是通过与标准平面的高度比较来确定的,然而由于牵涉到一些复杂且困难的测量,使得精确确定海平面成为一个困难的工作。 测量海平面的仪器叫做验潮仪,一般微风所导致的海面的波浪可以通过平均的方法消除掉,潮汐所导致的海平面的升高和跌落也可以通过长时间的观测后取平均值的方法消除掉。海平面的测量总是相对于陆地的测量,因此海平面的变化可以是真正地由于海面的变化导致的,也可以是由于陆地的变化导致的。
  • Il livello del mare indica l'altezza media della superficie terrestre rispetto a quella del mare; il termine può assumere significati specifici a seconda del contesto in cui lo si utilizza.
  • Sea level is generally used to refer to mean sea level (MSL), an average level for the surface of one or more of Earth's oceans from which heights such as elevations may be measured. MSL is a type of vertical datum – a standardised geodetic reference point – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured in order to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. The careful measurement of variations in MSL can offer insights into ongoing climate change, and sea level rise has been widely quoted as evidence of ongoing global warming. The term above sea level generally refers to above mean sea level (AMSL).
  • Poziom morza – punkt położony na wysokości teoretycznie równej zeru, w miejscu, gdzie morze styka się z lądem. Przyjęty w geografii i kartografii przeciętny poziom morza jest średnią wszystkich poziomów morza, wynikających z jego wahań, wywołanych takimi zjawiskami, jak falowanie czy pływy. Pod uwagę należy też wziąć dłuższe cykle wahań poziomu morza: 19-letni cykl Metona i 223-miesięczny cykl saros. W rzeczywistości ustalenie wartości średniego poziomu morza jest niezwykle trudne, np. średni poziom morza po pacyficznej stronie Kanału Panamskiego jest o 20 cm wyższy niż po stronie atlantyckiej. Przy wyznaczeniu poziomu morza trzeba też brać pod uwagę kształt elipsoidy (czy też geoidy), jaką jest Ziemia, oraz efekty wywołane lokalnymi anomaliami grawitacyjnymi. W dłuższym okresie średni poziom morza może zmienić się także na skutek globalnego ochłodzenia lub też globalnego ocieplenia, np. poprzez topnienie lądolodów. W Polsce oraz większości byłych krajów bloku wschodniego, średni poziom morza wyznaczony jest w oparciu o wskazania mareografu w Kronsztadzie (Rosja, niedaleko Sankt Petersburga). Natomiast w Wielkiej Brytanii średni poziom morza wyznaczany jest na podstawie pomiarów wykonanych w Newquay w Kornwalii. W sumie w Europie poszczególne kraje w swoich lokalnych systemach wysokościowych wykorzystywały co najmniej 15 różnych mareografów. Obecnie prowadzone są prace nad wprowadzeniem jednego Europejskiego Wysokościowego Systemu Odniesień (EVRS). Wysokość jakiegoś punktu względem poziomu morza to jego wysokość bezwzględna. Oznacza się ją skrótem n.p.m., czyli nad poziomem morza. Tereny depresyjne, czyli położone poniżej poziomu morza, oznacza się skrótem p.p.m. lub podaje jako wartość ujemną np. brzeg Morza Martwego: 392 m p.p.m. lub −392 m n.p.m. Niektóre tak zwane "morza", jak wspomniane wyżej Morze Martwe czy Morze Kaspijskie, są w rzeczywistości jeziorami, zatem żadne z nich nie jest używane do wyznaczania opisanego wyżej średniego poziomu morza. Na innych planetach, gdzie brak jest pokrywy wodnej, "poziom morza", wobec którego określa się wysokości pozostałych punktów, oblicza się jako średnią wysokości wszystkich punktów na powierzchni planety.
  • Nível médio do mar (NMM) (do inglês MSL: Mean Sea Level), por vezes denominado simplesmente nível do mar, é a altitude média da superfície do mar. O NMM possui muitas aplicações. É, por exemplo, utilizado como referência para se mensurar as altitudes dos acidentes topográficos, especificar curvas de nível e suas cotas (nos mapas e plantas cartográficas) etc. Em aeronáutica, é utilizado para cálculo da altitude de densidade de uma aeronave ou um aeródromo. Quando uma aeronave desloca-se na altitude de transição (nível atmosférico no qual e abaixo do qual a posição vertical de qualquer aeronave é medida do ponto em que a aeronave se encontre até o nível médio do mar) ou abaixo da altitude de transição, é comum informar que a aeronave está voando AMSL (acima do nível médio do mar).
  • Het zeeniveau is de gemiddelde hoogte van de zeespiegel (het vlak van de zee), als alle variaties die het gevolg zijn van de getijden worden weggemiddeld. Er zijn twee manieren om de hoogte van het zeewater te meten: het absolute zeeniveau ten opzichte van het middelpunt van de Aarde en het relatieve zeeniveau ten opzichte van de zeebodem. Het zeeniveau is het resultaat van het volume vloeibaar water op Aarde en van de gemiddelde temperatuur die de gemiddelde dichtheid van het water beïnvloedt. Veranderingen in het absolute zeeniveau (zogenaamde eustatische veranderingen) zijn in de loop van de geologische tijdschaal en zelfs in de geschreven geschiedenis voorgekomen. Als er veel ijs op de poolkappen en in gletsjers is opgeslagen daalt de zeespiegel, in glaciale perioden (ijstijden) zelfs met vele tientallen meters. Het zeeniveau wordt als referentievlak gebruikt om hoogte aan te duiden van locaties op het land (zoals luchthavens en woonplaatsen) en van vliegtuigen in de lucht.
  • Mean sea lieevel (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by global warming, and careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level generally refers to above mean sea level (AMSL). The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today.
  • en shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. actors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by global warming, and careful measurement of variations in MSL can offer insights into ongoing climate change. T
  • Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The lactose dimmer spherical ovulate global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by global warming, and careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level generally refers to above mean sea level (AMSL). The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today.
  • Mean sea level🌍💧 (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by global warming, and careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level generally refers to above mean sea level (AMSL). The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today.
  • Ye883u773727727273u3uu3u3i3892Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by global warming, and careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level generally refers to above mean sea level (AMSL). The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today.
  • Sea level is dragon ball super look go to YouTube and search dragon ball super.(For other uses, see Sea level (disambiguation).) Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by global warming, and careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level generally refers to above mean sea level (AMSL). The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today.
  • Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by global warming, and careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level generally refers to above mean sea level (AMSL). The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today. No.
  • {{ot ing sea level is situated between Jerusalem and the Dead Sea.]] Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by global warming, and careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level generally refers to above mean sea level (AMSL). The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today.
  • Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. However, 20th century and current millennium sea level rise is presumed to be caused by climate change, and careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level generally refers to above mean sea level (AMSL). The term APSL means Above Present Sea Level, comparing sea levels in the past with the level today.
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