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.
Hence a change in MSL can result from a real change in sea level, or from a change in the height of the land on which the tide gauge operates. In the UK, the Ordnance Datum (the 0 metres height on UK maps) is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921. Prior to 1921, the datum was MSL at the Victoria Dock, Liverpool.