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projections and math www.douglassdavis.com 09-25-2005
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Posted by www.douglassdavis.com on September 25, 2005, 7:53 am
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I really don't know the mathematics behind projections and latitude and
longitude. Is there a good resource that I can use to study this type
of thing?

Also, if I have a lat/lon point, how can I figure out the latitude (for
example) going north 5 miles, south 5 miles, east 5 miles, west 5
miles... to approximate a box around that area.



Posted by Andrew Miller on September 26, 2005, 12:11 am
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John P. Snyder's books are probably the best resource:

"Map Projections - A Working Manual" gives detailed info on 27 different
projections, including formulas for both a sphere and an ellipsoid

"An Album of Map Projections" featues less detailed info on 90 map
projections, again with formulas.

Finally, "Flattening The Earth - Two Thousand Years of Map Projections"
gives the history of map projections, but there are very few formulas.

Some web sites:

http://www.colorado.edu/geography/gcraft/notes/mapproj/mapproj_f.html
http://www.geography.hunter.cuny.edu/mp/
http://ioc.unesco.org/oceanteacher/resourcekit/M3/Formats/ProjectionsPoster/Map%20Projections%20Poster.htm
http://www.ilstu.edu/microcam/map_projections/
http://www.3dsoftware.com/Cartography/USGS/MapProjections/
http://www.progonos.com/furuti/MapProj/Normal/TOC/cartTOC.html (appears to
have gone?)

>
>
> I really don't know the mathematics behind projections and latitude and
> longitude. Is there a good resource that I can use to study this type
> of thing?
>
> Also, if I have a lat/lon point, how can I figure out the latitude (for
> example) going north 5 miles, south 5 miles, east 5 miles, west 5
> miles... to approximate a box around that area.
>




Posted by PJ Halls on September 26, 2005, 7:43 am
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Andrew Miller wrote:
>
> John P. Snyder's books are probably the best resource:
>
> "Map Projections - A Working Manual" gives detailed info on 27 different
> projections, including formulas for both a sphere and an ellipsoid
>
> "An Album of Map Projections" featues less detailed info on 90 map
> projections, again with formulas.
>
> Finally, "Flattening The Earth - Two Thousand Years of Map Projections"
> gives the history of map projections, but there are very few formulas.

And for two more introductory texts, both involving Snyder, which
include formulae & reference tables and also give an understanding of
the results of many years of map projections research in Russia and
China (and thus many excellent projections for 'the east'):

Map Projections: A Reference Manual. Lev M Bugayevskiy & John P
Snyder. Taylor & Francis 1995.

Map Projection Transformation: Principles and Applications. Qihe Yang,
John P Snyder and Waldo R Tobler. Taylor & Francis 2000.

Peter

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