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sea level where is it ?
Ep! where is the zero point of "sea level" (gps coordinates) ???? in what sea/ocean ???? in what point ??? how is measured altitude of mountains ? how mach meters have the Gaorisankar (Everest) ??? some people say 8.848 others 8.850... what is correct ??? Dead sea is at "sea level" ??? the big depression in water surface in Indic ocean of -300m. is also at "sea level" ?? after indic tsunami and global changes in planet "sea level" also sufer variations ??? a reveure des Catalunya, the YoYoMan :-) |
The YoYoMan wrote:
Ep! where is the zero point of "sea level" (gps coordinates) ???? That depends on how you set the datum. Look in the menus of your GPS machine and see which datum sets are available, then Google up the references to see which is most appropriate for your usage & area. in what sea/ocean ???? Varies widely, "mean sea level" for specific areas is defined by averaging out the tidal variation over a 19 year cycle. how is measured altitude of mountains ? With a very very long piece of string. DSK |
Sea level is at your waterline.
Your welcome. Joe |
"The YoYoMan" escribió en el mensaje ... Ep! where is the zero point of "sea level" (gps coordinates) ???? in what sea/ocean ???? in what point ??? I think the reference is not a point but a surface, the geoid surface, which is an oblate spheroid that is determined I think by measuring the gravity (I don't know how, thpough). This gives 0 meter altitude. how is measured altitude of mountains ? how mach meters have the Gaorisankar (Everest) ??? some people say 8.848 others 8.850... what is correct ??? Actually the Chinese are just sending a mission to determine the new height of the Everest, since it is believed that Everest snow cap is melting down due to global warming. Dead sea is at "sea level" ??? Dead sea is approx 400m below sea level. http://ask.yahoo.com/ask/20010920.html the big depression in water surface in Indic ocean of -300m. is also at "sea level" ?? I didn't know that. Where did you find that ? after indic tsunami and global changes in planet "sea level" also sufer variations ??? Actually, parts of sumatra shore ahev dived under water, beacuse the earthquake have lowered part of the island. The variation of sea level was but transient, as far as I know. a reveure des Catalunya, the YoYoMan :-) Doncs si home, a reveure ! Que vagi be a Catalunya ! Coneixes-tu foros de geología en castellá o en catalá ? En vaig buscar pero no vaig trobar rés. |
According to Jon, global warming is Bush's fault.
He fail to see that global warming and cooling has been a cycle going on since the beginning of the earth. Enjoy the warm winter days, and buy waterfront land inland now while it's still cheap. Joe |
"JG" wrote in message ... According to the Republicans, global warming is a hoax. You were the one wearing a jacket in the BVI's Ganz...... what's up wid dat? How old are you anyway... 59??? CM |
A jacket?
-- "j" ganz @@ www.sailnow.com "Capt. Mooron" wrote in message news:jqcLd.81910$Ob.43336@edtnps84... "JG" wrote in message ... According to the Republicans, global warming is a hoax. You were the one wearing a jacket in the BVI's Ganz...... what's up wid dat? How old are you anyway... 59??? CM |
No. Global warming is not Bu****'s fault. He's just making it worse.
-- "j" ganz @@ www.sailnow.com "Joe" wrote in message oups.com... According to Jon, global warming is Bush's fault. He fail to see that global warming and cooling has been a cycle going on since the beginning of the earth. Enjoy the warm winter days, and buy waterfront land inland now while it's still cheap. Joe |
Yo,
Yo man. Mean sea level is almost an arbitrary point. It's picked for a best fit of data. Mount Everest is not the tallest mountain when measured from the center of the earth. Chimborazo in Ecuador is. The ocean has depressions in it all over the place. Gravity is not the same over the earth's surface. The world standard for sea level and the gravitational constant is located here on Gilligans Island 10 meters from the stern of the Minnow, right next to the Captain Neal shrine. The Professor keeps it calibrated on a daily basis. Hope this helps. Gilligan "The YoYoMan" wrote in message ... Ep! where is the zero point of "sea level" (gps coordinates) ???? in what sea/ocean ???? in what point ??? how is measured altitude of mountains ? how mach meters have the Gaorisankar (Everest) ??? some people say 8.848 others 8.850... what is correct ??? Dead sea is at "sea level" ??? the big depression in water surface in Indic ocean of -300m. is also at "sea level" ?? after indic tsunami and global changes in planet "sea level" also sufer variations ??? a reveure des Catalunya, the YoYoMan :-) |
It helps to see why you and Neal or bottom buddies.
-- "j" ganz @@ www.sailnow.com "Gilligan" wrote in message k.net... Yo, Yo man. Mean sea level is almost an arbitrary point. It's picked for a best fit of data. Mount Everest is not the tallest mountain when measured from the center of the earth. Chimborazo in Ecuador is. The ocean has depressions in it all over the place. Gravity is not the same over the earth's surface. The world standard for sea level and the gravitational constant is located here on Gilligans Island 10 meters from the stern of the Minnow, right next to the Captain Neal shrine. The Professor keeps it calibrated on a daily basis. Hope this helps. Gilligan "The YoYoMan" wrote in message ... Ep! where is the zero point of "sea level" (gps coordinates) ???? in what sea/ocean ???? in what point ??? how is measured altitude of mountains ? how mach meters have the Gaorisankar (Everest) ??? some people say 8.848 others 8.850... what is correct ??? Dead sea is at "sea level" ??? the big depression in water surface in Indic ocean of -300m. is also at "sea level" ?? after indic tsunami and global changes in planet "sea level" also sufer variations ??? a reveure des Catalunya, the YoYoMan :-) |
"Gilligan" wrote in message
news:uoeLd.2473 Yo, Yo man. He's a cellist, isn't he? |
Yo, that yo ma!
Gilligan "Wally" wrote in message k... "Gilligan" wrote in message news:uoeLd.2473 Yo, Yo man. He's a cellist, isn't he? |
I noticed in your sailing photos the presence of a toroidal foam cushion,
the kind used by people who have had hemmorhoid surgery. Did you experience any rectal soreness on your trip? Were you able to "accomodate" the locals? Gilligan "JG" wrote in message ... It helps to see why you and Neal or bottom buddies. -- "j" ganz @@ www.sailnow.com "Gilligan" wrote in message k.net... Yo, Yo man. Mean sea level is almost an arbitrary point. It's picked for a best fit of data. Mount Everest is not the tallest mountain when measured from the center of the earth. Chimborazo in Ecuador is. The ocean has depressions in it all over the place. Gravity is not the same over the earth's surface. The world standard for sea level and the gravitational constant is located here on Gilligans Island 10 meters from the stern of the Minnow, right next to the Captain Neal shrine. The Professor keeps it calibrated on a daily basis. Hope this helps. Gilligan "The YoYoMan" wrote in message ... Ep! where is the zero point of "sea level" (gps coordinates) ???? in what sea/ocean ???? in what point ??? how is measured altitude of mountains ? how mach meters have the Gaorisankar (Everest) ??? some people say 8.848 others 8.850... what is correct ??? Dead sea is at "sea level" ??? the big depression in water surface in Indic ocean of -300m. is also at "sea level" ?? after indic tsunami and global changes in planet "sea level" also sufer variations ??? a reveure des Catalunya, the YoYoMan :-) |
I have no experience with hemorrhoids, but feel free to tell us all about
them, given that you would have to be an expert with all the activitiy you're used to. Actually, don't. -- "j" ganz @@ www.sailnow.com "Gilligan" wrote in message nk.net... I noticed in your sailing photos the presence of a toroidal foam cushion, the kind used by people who have had hemmorhoid surgery. Did you experience any rectal soreness on your trip? Were you able to "accomodate" the locals? Gilligan "JG" wrote in message ... It helps to see why you and Neal or bottom buddies. -- "j" ganz @@ www.sailnow.com "Gilligan" wrote in message k.net... Yo, Yo man. Mean sea level is almost an arbitrary point. It's picked for a best fit of data. Mount Everest is not the tallest mountain when measured from the center of the earth. Chimborazo in Ecuador is. The ocean has depressions in it all over the place. Gravity is not the same over the earth's surface. The world standard for sea level and the gravitational constant is located here on Gilligans Island 10 meters from the stern of the Minnow, right next to the Captain Neal shrine. The Professor keeps it calibrated on a daily basis. Hope this helps. Gilligan "The YoYoMan" wrote in message ... Ep! where is the zero point of "sea level" (gps coordinates) ???? in what sea/ocean ???? in what point ??? how is measured altitude of mountains ? how mach meters have the Gaorisankar (Everest) ??? some people say 8.848 others 8.850... what is correct ??? Dead sea is at "sea level" ??? the big depression in water surface in Indic ocean of -300m. is also at "sea level" ?? after indic tsunami and global changes in planet "sea level" also sufer variations ??? a reveure des Catalunya, the YoYoMan :-) |
JG wrote:
No. Global warming is not Bu****'s fault. He's just making it worse. Are you saying that Bush is causing the increase in solar energy output? |
"DSK" wrote in message
... The YoYoMan wrote: Ep! where is the zero point of "sea level" (gps coordinates) ???? That depends on how you set the datum. Look in the menus of your GPS machine and see which datum sets are available, then Google up the references to see which is most appropriate for your usage & area. in what sea/ocean ???? Varies widely, "mean sea level" for specific areas is defined by averaging out the tidal variation over a 19 year cycle. how is measured altitude of mountains ? With a very very long piece of string. Oh for heavens sake! Please help me get the coffee off my monitor. Just a side note, the string is usually emplaced by wild geocachers. -- ... Hank http://home.earthlink.net/~horedson http://home.earthlink.net/~w0rli |
No, he's not bright enough.
-- "j" ganz @@ www.sailnow.com "« Paul »" wrote in message ... JG wrote: No. Global warming is not Bu****'s fault. He's just making it worse. Are you saying that Bush is causing the increase in solar energy output? |
"JG" wrote in message
... According to the Republicans, global warming is a hoax. and Social Security is in deep trouble! |
I had one once almost 20 years ago. I didn't know what it was at first.
Would you like to see a picture of it? Love, Gilligan "JG" wrote in message ... I have no experience with hemorrhoids, but feel free to tell us all about them, given that you would have to be an expert with all the activitiy you're used to. Actually, don't. -- "j" ganz @@ www.sailnow.com "Gilligan" wrote in message nk.net... I noticed in your sailing photos the presence of a toroidal foam cushion, the kind used by people who have had hemmorhoid surgery. Did you experience any rectal soreness on your trip? Were you able to "accomodate" the locals? Gilligan "JG" wrote in message ... It helps to see why you and Neal or bottom buddies. -- "j" ganz @@ www.sailnow.com "Gilligan" wrote in message k.net... Yo, Yo man. Mean sea level is almost an arbitrary point. It's picked for a best fit of data. Mount Everest is not the tallest mountain when measured from the center of the earth. Chimborazo in Ecuador is. The ocean has depressions in it all over the place. Gravity is not the same over the earth's surface. The world standard for sea level and the gravitational constant is located here on Gilligans Island 10 meters from the stern of the Minnow, right next to the Captain Neal shrine. The Professor keeps it calibrated on a daily basis. Hope this helps. Gilligan "The YoYoMan" wrote in message ... Ep! where is the zero point of "sea level" (gps coordinates) ???? in what sea/ocean ???? in what point ??? how is measured altitude of mountains ? how mach meters have the Gaorisankar (Everest) ??? some people say 8.848 others 8.850... what is correct ??? Dead sea is at "sea level" ??? the big depression in water surface in Indic ocean of -300m. is also at "sea level" ?? after indic tsunami and global changes in planet "sea level" also sufer variations ??? a reveure des Catalunya, the YoYoMan :-) |
Primary first order bench marks are established at or near tide
stations. US Department of Commerce has charter for US. Data is available from NOAA in Maryland. Satellites can be used but are less accurate. NOAA has some publications describing the methods, theory and technique of first order levels. Mean sea level will vary with provincial gravity. Rising mean sea level is as evasive as global warming. |
¨
¨ "The YoYoMan" escribió en el mensaje ¨ ... ¨ ¨ Ep! ¨ ¨ where is the zero point of "sea level" (gps coordinates) ???? ¨ ¨ in what sea/ocean ???? ¨ ¨ in what point ??? ¨ I think the reference is not a point but a surface, the geoid surface, which ¨ is an oblate spheroid that is determined I think by measuring the gravity (I ¨ don't know how, thpough). This gives 0 meter altitude. ¨ ¨ ¨ how is measured altitude of mountains ? ¨ ¨ how mach meters have the Gaorisankar (Everest) ??? ¨ some people say 8.848 others 8.850... what is correct ??? ¨ ¨ Actually the Chinese are just sending a mission to determine the new height ¨ of the Everest, since it is believed that Everest snow cap is melting down ¨ due to global warming. what ? :-) snow are a thing variable!!! stupid people not insert a bar of metal in snow for found the real top of rock ? oooooh my god!!! ¨ Dead sea is at "sea level" ??? ¨ Dead sea is approx 400m below sea level. ¨ http://ask.yahoo.com/ask/20010920.html a sea and his "sea level" are under "sea level" ???? very crazy no ? ¨ the big depression in water surface in Indic ocean of -300m. is also at ¨ "sea ¨ level" ?? ¨ ¨ I didn't know that. Where did you find that ? in book: 1001 things everyone should know about science by james trefil ¨ after indic tsunami and global changes in planet "sea level" also sufer ¨ variations ??? ¨ Actually, parts of sumatra shore ahev dived under water, beacuse the ¨ earthquake have lowered part of the island. The variation of sea level was ¨ but transient, as far as I know. after gibraltar terra connection with africa break the sea level of all mediterranian coast make a big elevation... if a wall are builded another time betheen africa and al-andalus the "sea level" of mediterranean sea return to his original level... and many cities and constructions rising... ¨ a reveure des Catalunya, the YoYoMan :-) ¨ ¨ ¨ Doncs si home, a reveure ! Que vagi be a Catalunya ! Coneixes-tu foros de ¨ geología en castellá o en catalá ? En vaig buscar pero no vaig trobar rés. ¨ llistes en catala: La Teranyina - Samizdat. Llistes de correu dels Països Catalans http://www.teranyina.net/samizdat.html tambe potser trobes quelcom a : www.rescat.net/ a l'institut cartografic de catalunya: www.icc.es dona un cop d'ull a les llistes de www.rediris.es i no t'estranys que encara aquests paios escriguin amb ploma natural, potet de tinta i suca que sucaras :-) per cert has mirat la ESRA o ESNA la base de dades en 3-d de la nasa de la terra de la zona dels pirineus ? fins aviat i que vagui be pel canada! :-) |
"Wally" wrote in message k... "Gilligan" wrote in message news:uoeLd.2473 Yo, Yo man. He's a cellist, isn't he? Yeah, yeah ....man! Regards Donal -- |
Sealevel is way over my head... Cheers! Remco --- Dutch |
"« Paul »" wrote in message ... JG wrote: No. Global warming is not Bu****'s fault. He's just making it worse. Are you saying that Bush is causing the increase in solar energy output? All that hot air coming out of his mouth, don't you know... |
"Wally" wrote in message k... "Gilligan" wrote in message news:uoeLd.2473 Yo, Yo man. He's a cellist, isn't he? I thought he was a rapper. |
Rod Burns wrote in sci.geo.geology:
I think the reference is not a point but a surface, the geoid surface, which is an oblate spheroid that is determined I think by measuring the gravity (I don't know how, thpough). This gives 0 meter altitude. Very close. The ellipsoid is a mathematical reference surface used by geodesists and cartographers. There are several, but GRS80 or WGS84 are most commonly used today. The geoid is a gravitational equipotential surface undulating above and below the ellipsoid. The WGS84 value for the gravitational potential was chosen for best fit to the global sea surface, but it doesn't follow the sea surface. [In fact "the geoid" is a misnomer, since there are actually several different potentials that have merit.] Mean sea level is location dependent and may vary from the geoid due to ocean dynamics. Different datums specify mean sea level by averaging designated tide guages. Elevation is measured with reference to a datum. -- Jim Irwin http://www.holoscenes.com |
jimirwin a écrit dans le message ... Rod Burns wrote in sci.geo.geology: I think the reference is not a point but a surface, the geoid surface, which is an oblate spheroid that is determined I think by measuring the gravity (I don't know how, thpough). This gives 0 meter altitude. Very close. The ellipsoid is a mathematical reference surface used by geodesists and cartographers. There are several, but GRS80 or WGS84 are most commonly used today. The geoid is a gravitational equipotential surface undulating above and below the ellipsoid. The WGS84 value for the gravitational potential was chosen for best fit to the global sea surface, but it doesn't follow the sea surface. [In fact "the geoid" is a misnomer, since there are actually several different potentials that have merit.] Mean sea level is location dependent and may vary from the geoid due to ocean dynamics. Different datums specify mean sea level by averaging designated tide guages. Elevation is measured with reference to a datum. -- Jim Irwin http://www.holoscenes.com mean sea level -A tidal datum: the arithmetic mean of hourly water elevations observed over a specific 19-year cycle. Points on land can be referenced to a mean sea level, in which case the datum assumes zero elevation. " sea level is not a simple surface. Since the sea surface conforms to the earth's gravitational field, MSL also has slight hills and valleys that are similar to the land surface but much smoother. However, zero elevation as defined by Spain is not the same zero elevation defined by Canada, which is why locally defined vertical datums differ from each other." The geoid corresponds to mean sea level. In land covered areas, the geoid is the surface that would be determined by the level to which water would rise in narrow canals cut through the continents. JOL |
maison.mousse wrote in sci.geo.geology:
Since the sea surface conforms to the earth's gravitational field, MSL also has slight hills and valleys that are similar to the land surface but much smoother. Yes, the mean sea surface (a.k.a. mean ocean topography) conforms to the gravitational potential surface to within about 1 meter. Ocean topography is also affected by long term conditions such as prevailing winds, currents, temperature, and salinity -- factors in addition to the gravitational field. The Geoid is defined by the gravitational field alone. There are efforts to quantify the differences more accurately. -- Jim Irwin http://www.holoscenes.com |
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