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Hopefully a simple question, but if you were building something completely new, how would you record the data? Specifically if you wanted to use OSM, would you store the co-ordinates in EPSG:3857 or EPSG:4326? Of course if you need to exchange data with other systems EPSG:4326 might be more useful as users are fairly familiar with the idea of latitude/longitude, however given this would be the exception rather than the rule, is there any merit in storing the data in EPSG:3857 and converting to EPSG:4326 when needed? Would this be any faster with less conversions going on to plot the data on a map? If this is sensible is there an easy way to convert EPSG:3857 to tile names like there is for EPSG:4326?

asked 22 Jul '13, 09:06

Scott07's gravatar image

accept rate: 0%

Storing coordinates in EPSG:3857 could mean a slight performance advantage when drawing but it would also mean that you cannot capture information around the poles since that projection only goes up to 85°N (or down to 85°S).

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answered 22 Jul '13, 09:32

Frederik%20Ramm's gravatar image

Frederik Ramm ♦
accept rate: 23%

Thanks for that, the 85 degree constraint wont be a problem for the intended use. How would you work out a map tile for a EPSG:3857 co-ordinate?



(22 Jul '13, 12:53) Scott07
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question asked: 22 Jul '13, 09:06

question was seen: 2,116 times

last updated: 22 Jul '13, 12:53

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