world map with mercator projection

[yingban]

Hi neveldo,

great work !
Is there any parameter to change the projection style ? or should i create my own map ?

Thanks

[neveldo]

Hello yingban,

You have to create your own map based on the SVG file of the world map. You can find here some world maps with other projections : http://commons.wikimedia.org/wiki/Category:Blank_SVG_maps_of_the_world .

Be carefull, the algorithm to convert latitude,longitude into x,y (in the getCoords() method) will be more tricky than with the equi-rectangular projection which is the simplest one.

[yingban]

Thank you !

[cgordenne]

Hello,

I'm using a mercator projection map too. I have only one problem, the getCoords() method.
Do you have an example for this type of projection ?

[neveldo]

Hello,

Unfortunately, for now, there is no example of maps for mapael with a mercator projection.

Maybe you could find useful information in this thread from stackoverflow : http://stackoverflow.com/questions/14329691/covert-latitude-longitude-point-to-a-pixels-x-y-on-mercator-projection .

Feel free to share your feedback about mercator projection here !

[scooterlord]

Hello, it was not until today that I realized I needed a mercator projection too. Are there any plans for implementing this on mapael?

[neveldo]

Hello,

As the getCoords() function just takes as parameters a couple of latitude,longitude and returns a couple of x,y coordinates, there is no need of implementing a specific projection in mapael. The algorithm that allows to convert a (latitude,longitude) into a (x,y) should fit within this function.

I think the tutorial for creating new maps (http://www.vincentbroute.fr/mapael/create-map.php#getcoords) should be completed in order to show how to handle maps with mercator projection. I will add it to my todos, but feel free to contribute if you have any time !

[scooterlord]

Thanks for your pointers. I wish I was fluent enough with js that I could help out :/

[Indigo744]

Dear all,
We are working on an example for Mercator projections.
Could you provide us your Mercator map? I have trouble finding a good one... :-/
Thanks a lot.

[Indigo744]

As the Mercator projection is now fully implemented, we will close this issue.

Feel free to open a new thread if you have any questions.