Creating an overlay

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Netspeed
Posts: 8
Joined: Sat Jan 24, 2009 3:10 am

Creating an overlay

Postby Netspeed » Sat Jan 24, 2009 3:19 am

I'm not even sure that's the best term so I'll describe it as best as possible.

I have an SVG file of a layout of a racetrack. Here's the link: http://en.wikipedia.org/wiki/File:Circuit_de_la_sarthe_rev12_enlabels.svg It's black and white and is only a single layer as far as I can tell. I want to be able to take the black part (the track) and be able to sumperimpose it on top of a Google Earth photo. Is something that Inkscape can do or should I try it with a different format in Gimp?

Thanks for any and all help!

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prkos
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Location: Croatia

Re: Creating an overlay

Postby prkos » Sat Jan 24, 2009 3:33 am

Both inkscape and gimp can do it. I think inkscape might be better because you'll probably have to adjust the track size to fit perfectly on the raster image. Although when opening svg in gimp you are asked for the size that the svg will be rendered in, but still it's much more flexible in Inkscape.

And btw that svg file is actually black and transparent, so it's perfect for a stack on a raster map (photo). Just open the svg file, import the google photo into it, send google photo to the bottom, and then just adjust the track object(s) to align with the photo.
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Netspeed
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Joined: Sat Jan 24, 2009 3:10 am

Re: Creating an overlay

Postby Netspeed » Sat Jan 24, 2009 3:41 am

Thanks for the quick and informative reply!

So if I import the Google Earth photo and stack it correctly, the white background goes away?

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prkos
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Location: Croatia

Re: Creating an overlay

Postby prkos » Sat Jan 24, 2009 3:51 am

When I'm looking at the link from your first post I see a faint checkerboard pattern on the image, that mean those areas are transparent (not white). If you open that svg in a browser that had red color as default background color you would see track on red, not white. So if you see the track on white when you click on that image to see svg file it's because your browsers default bg color is white. In firefox you can change the background color to something other than white under Preferences > Content > Color button so you can see for your self when you go to http://upload.wikimedia.org/wikipedia/c ... labels.svg

When you open that file in Inkscape you will also see it on white, but if you put an object beneath the track you will see that everything except the track is transparent. Inkscape's default background color is transparent, even though you see a white screen.
just hand over the chocolate and nobody gets hurt

Inkscape Manual on Floss
Inkscape FAQ
very comprehensive Inkscape guide
Inkscape 0.48 Illustrator's Cookbook - 109 recipes to learn and explore Inkscape - with SVG examples to download

Netspeed
Posts: 8
Joined: Sat Jan 24, 2009 3:10 am

Re: Creating an overlay

Postby Netspeed » Sat Jan 24, 2009 3:56 am

Thanks for all the advice and your time! I really appreciate it!

Netspeed
Posts: 8
Joined: Sat Jan 24, 2009 3:10 am

Re: Creating an overlay

Postby Netspeed » Sat Jan 24, 2009 8:50 am

It works soooo cool! Google Earth even has tab to create an overlay. Just browse for the photo and voila!

Thanks again!


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