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Huey84
Joined: 21 Sep 2009
Posts: 1
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 Posted: Mon Sep 21, 2009 7:27 pm Post subject: superimposing patterns from two different maps. |
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Hi guys,
I am trying to superimposed the red dot distribution pattern over the yellow dot distribution pattern for comparative purposes. Is it possible to get some % overlap values for the two patterns once the images have been superimposed? I plan to do some statistical analysis if I can get overlap % values.
If anyone can offer some assitance it will be much appreciated.
Yellow dots are the distribution of marine protected areas, and the red dots are the distribution of Acropora corals |
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wave of light
Joined: 16 Sep 2009
Posts: 68
Location: South Yorkshire - UK
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| Posted: Thu Sep 24, 2009 5:14 am Post subject: |
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You could stick both images on to separate layers inside Photoshop (red dot map on top of yellow dot map). And then change the opacity the top layer to 50% so the bottom layer shows through. However, your maps aren't of similar proportions, so it would be difficult to match them up.
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wave of light
Joined: 16 Sep 2009
Posts: 68
Location: South Yorkshire - UK
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| Posted: Thu Sep 24, 2009 5:29 am Post subject: |
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Here, this is the best I could come up with, with the images supplied.
I had to remake and stretch the red dot map so that it overlayed the yellow dot map exactly.
I then removed any colour that wasn't red, leaving just the dots.
Hope it's what you had in mind.
Waves.
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