draw overlay of equal square boxes

[khaldoon]

Hi,

 Well, My goal is to draw overlay of equal size square boxes. Please see the example below:

Example:

for example i start with lat,lng (80,80), i want to move 5km east and 5km sought and draw box then next box will start from lat, lng (80+5km, 80), similarly so on and so forth. end goal is to draw grid of equal boxes

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|   5kmx5km       |  5kmx5km        |

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|   5kmx5km       |  5kmx5km        |

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Do i need to change map projection in order to do this? or do u have any idea? thanks

[geoco...@gmail.com]

Some examples that may help you:
http://www.geocodezip.com/v3_polygon_example_squares.html
(from before the geometry library was released, there may be better
ways now)

http://www.geocodezip.com/v3_MW_example_eshapes.html

-- Larry

[Nianwei Liu]

> Do i need to change map projection in order to do this? or do u have any
> idea? thanks

That would depends on your goal, some project preserve distance, some
preserve area, some directions. You can use the default Mercator
projection, which preserves north, but not S-N distance. Your square
will not look exactly like "square".