Definition of âintensive agricultureâ - English Dictionary. See all translations. uk â us â also intensive farming ENVIRONMENT. âº farming that uses a lot of machinery, labour, chemicals, etc. in order to grow as many crops or keep as many animals as possible on the amount of land available: The use of chemical fertilizers and pesticides in intensive agriculture has dramatically increased crop yields.
MSL, or mean sea level, is the altitude above sea level. Since AGL, or above ground level, changes as you go over differing terrain, we use MSL to set our altimeter so we are on a common measurement. For instance, where I live, in the Willamette Valley of Oregon, our elevation is only about 200' above sea level.
MSL can vary slightly with time and from place to place, so in Australia a Mean Sea Level value measured in 1966-1968 at 30 tide gauges around the country is used as the reference for height measurement. It is known as the Australian Height Datum (AHD).