http://www.dintelligent.com/mercator-projection-2/
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mercator projection
Are the latitude lines parallel on both the globe and Mercator projection?
yes
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West Wing - Why are we changing maps?
Hi, JT here. I recently received a Projection Alarm Clock as a gift and thought that it was just the coolest thing ever. I've started giving them to friends and thought I'd do a little research and put a site together about Projection Clocks and Atomic Clocks. I hope you enjoy!
5 Comments
ArcGIS Server Blog : Measuring distances and areas when your map uses the Mercator projection
12: Adam it’s actually an area the size of the continental United States. Australia is a lot bigger than it looks on a standard Mercator projection map.
I pointed out the color problem in a comment on WUWT last fall. The problem is that they are not using the standard color temperature scales and switch directly from blue to yellow, bypassing white.Here is a standard color temperature scale charts move directly from blue to yellow, creating a mental image for the viewer that is biased. Rather than using a gradient, they have also chosen a set of fixed colors that tends to emphasize warmth, rather than a display of temperature anomalies. They also choose a Mercator projection map which tremendously overemphasizes the polar temperatures by stretching a tiny area across the entire top and bottom of the chart.The choices made suggest either someone not familiar with presenting information visually (i.e. incompetent), or someone who specifically knew what they were doing in order to create an effective marketing presentation for the purpose of closing a sale.
a. equal-area projection
b. Mercator projection
c. topographic map
d. legend
In addition… If I’m not mistaken, the color of the ocean denotes bathymetry, where darker blue would be deep ocean. You can see in the beginning most of the ocean is Very Deep, whereas at present there is a lot more “shallow” ocean. Additionally, this appears to be a standard Mercator projection map, which greatly over-represents the actual sizes of features anywhere near the poles. Up until about the Jurassic, a large portion of the depicted land mass is on or very near a pole, which makes it seem like there is a LOT more land than there actually is/was.