Comments on: Generating Heat Maps Using Perl http://blog.imtrevor.com/2009/07/16/generating-heat-maps-using-perl/ and this is what I say. Wed, 20 Oct 2010 04:54:37 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: trevor http://blog.imtrevor.com/2009/07/16/generating-heat-maps-using-perl/comment-page-1/#comment-1273 trevor Wed, 20 Oct 2010 04:54:37 +0000 http://blog.imtrevor.com/?p=46#comment-1273 There is a method to toggle transparency in the background (though I'm not completely clear on what you're referring to). Take a look at: http://search.cpan.org/~wazzuteke/Image-Heatmap-0.565/lib/Image/Heatmap.pm#transparent_bg Hopefully that will help. There is a method to toggle transparency in the background (though I’m not completely clear on what you’re referring to). Take a look at:

http://search.cpan.org/~wazzuteke/Image-Heatmap-0.565/lib/Image/Heatmap.pm#transparent_bg

Hopefully that will help.

]]> By: Per Henrik Johansen http://blog.imtrevor.com/2009/07/16/generating-heat-maps-using-perl/comment-page-1/#comment-818 Per Henrik Johansen Sun, 22 Aug 2010 16:49:52 +0000 http://blog.imtrevor.com/?p=46#comment-818 Thanks for a wonderful module. I have spent most of the weekend fooling around with it :) One thing I am pondering about though, when an area becomes hot, the heatmap becomes transparent (basemap is showing). I would have expected it to become white, at least when using the color scheme supplied with the module. Is it supposed to be transparent? Thanks for a wonderful module. I have spent most of the weekend fooling around with it :)

One thing I am pondering about though, when an area becomes hot, the heatmap becomes transparent (basemap is showing). I would have expected it to become white, at least when using the color scheme supplied with the module.

Is it supposed to be transparent?

]]> By: trevor http://blog.imtrevor.com/2009/07/16/generating-heat-maps-using-perl/comment-page-1/#comment-82 trevor Fri, 23 Oct 2009 04:39:01 +0000 http://blog.imtrevor.com/?p=46#comment-82 The short answer is this: * The <strong>map</strong> attribute can be used to set the image of your preference. * By default, using 0 for <strong>zoom, x_adjust and y_adjust </strong>will assume the map is of the entire world. * Adjusting these three attributes respectively will let you pan and zoom into any particular country you wish to map, including Canada * The examples in this article are examples of the US, which I tediously found the best combination of the three attributes for the particular map I used (and linked). As with any other map, simple adjustments can be made to find the right fit. I would recommend starting with all the defaults of '0' for the noted attributes. Zooming in a little here, a little there; adjusting the x and y coordinates a little here, a little there; eventually you will be able to find the precise location you are looking for with respect to the size, proportion and perspective of your map. Remember that the map must be of true scale of the geographical location you are looking to map as the coordinates are calculated from lat/long values and are immutable in terms of their location on the plane. Good luck! The short answer is this:

* The map attribute can be used to set the image of your preference.
* By default, using 0 for zoom, x_adjust and y_adjust will assume the map is of the entire world.
* Adjusting these three attributes respectively will let you pan and zoom into any particular country you wish to map, including Canada
* The examples in this article are examples of the US, which I tediously found the best combination of the three attributes for the particular map I used (and linked). As with any other map, simple adjustments can be made to find the right fit.

I would recommend starting with all the defaults of ‘0′ for the noted attributes. Zooming in a little here, a little there; adjusting the x and y coordinates a little here, a little there; eventually you will be able to find the precise location you are looking for with respect to the size, proportion and perspective of your map. Remember that the map must be of true scale of the geographical location you are looking to map as the coordinates are calculated from lat/long values and are immutable in terms of their location on the plane.

Good luck!

]]> By: moltar http://blog.imtrevor.com/2009/07/16/generating-heat-maps-using-perl/comment-page-1/#comment-80 moltar Thu, 22 Oct 2009 23:41:00 +0000 http://blog.imtrevor.com/?p=46#comment-80 The only thing is not clear at all is how to use other map images than the one provided. Lets say I want to do a city in Canada. How would this be done? The only thing is not clear at all is how to use other map images than the one provided. Lets say I want to do a city in Canada. How would this be done?

]]> By: trevor http://blog.imtrevor.com/2009/07/16/generating-heat-maps-using-perl/comment-page-1/#comment-23 trevor Fri, 11 Sep 2009 16:32:05 +0000 http://blog.imtrevor.com/?p=46#comment-23 Take a look at this link: http://search.cpan.org/~wazzuteke/Image-Heatmap-0.557/lib/Image/Heatmap.pm#map You must define where the original map image is (the image the plots will be set upon). If you don't already have a map, the examples from above use this one (of the US only): http://internetsamhard.com/wp-content/uploads/2009/07/usa-1650x875-mod.png Otherwise, the API for the current version is public here: http://search.cpan.org/~wazzuteke/Image-Heatmap And working examples are in this post as well. Take a look at this link:

http://search.cpan.org/~wazzuteke/Image-Heatmap-0.557/lib/Image/Heatmap.pm#map

You must define where the original map image is (the image the plots will be set upon).

If you don’t already have a map, the examples from above use this one (of the US only):

http://internetsamhard.com/wp-content/uploads/2009/07/usa-1650×875-mod.png

Otherwise, the API for the current version is public here:

http://search.cpan.org/~wazzuteke/Image-Heatmap

And working examples are in this post as well.

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