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Old 07-06-2012, 15:13   #1
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Google Earth scale different to OpenCPN...

The title says it all really. Just updated to OpenCPN 3.0, added the Google Earth plugin and the scales of the two don't match.
Am I doing something wrong?

There's a pic on Photobucket so you can see the problem.

http://i9.photobucket.com/albums/a89.../New/cpnge.jpg
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Old 07-06-2012, 16:35   #2
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Re: Google Earth scale different to OpenCPN...

I have exactly the same problem - the scale seems out by a factor of 2. The location needs some tweaking as well.
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Old 07-06-2012, 17:01   #3
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Re: Google Earth scale different to OpenCPN...

Guys...
What you show on the screenshot is definitely not how the the GE plugin I wrote should look... If you use the plugin, it will never be able to maintain the exact scale of the chart for technical reasons, that's why it does not offer an overlay display at all and always lives in its own window, docked besides the chart or floating, but never meant to offer overlay - there is no API that allows me to set the exact scale I would like GE to show.
What I would like to know is how you managed to make it look like this...

Pavel
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Old 08-06-2012, 02:13   #4
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Re: Google Earth scale different to OpenCPN...

Thanks Pavel, I had a couple of other issues so did a complete reinstall, it seems to be working fine now.
Easy to adjust zoom on GE window to match chart scale.

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Old 08-06-2012, 02:21   #5
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Re: Google Earth scale different to OpenCPN...

Pavel - thanks for your reply. In fact I have a separate docked or undocked window as you describe.

I have a number of GE overlays created using Paul Higgins GE2KAP and I assumed the plug-in was similar.
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Old 08-06-2012, 04:31   #6
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Re: Google Earth scale different to OpenCPN...

hoolie...
No they are not, GE2KAP creates a chart depending on the real coordinates of the GE viewport, which obviously can later be quilted with other charts "exactly". The plugin works exactly in the opposite direction - it knows what the chart viewport contains exactly and asks GE to be so kind and show something as close to it as possible - the problem is that the only possible way to do it is by the centerpoint and height of the camera above ground, which combined with the GE view not being Mercator and to WGS84 datum makes it impossible for the two areas to fit. The plugin view is "live", but at a price... Of course you get the best if you combine the two wisely.

Pavel
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Old 08-06-2012, 06:26   #7
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Re: Google Earth scale different to OpenCPN...

Pavel - indeed I now appreciate that the GE plug-in uses GE "live" (even if it's cached!) and provides useful lookahead at different scales and resolutions.
Obviously GE2KAP requires forward planning to produce the charts, which are of course fixed resolution. I have .kap pilotage files for all the places we're likely to visit in the western Med, tho' I'm tempted to re-do them now I have a 1080i screen.

Congrats to the team for the very successful launch of 3.0.0
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