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<div>Hi Jennifer from West Island, <br>
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<div>from someone else from down under.</div>
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<div>I'm not sure this is a simple exercise, or that you'll get any better precision than 0.3%, but...<br>
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<div dir="ltr">I'd grab any reasonable world map dataset, natural earth, GSHHG, etc...</div>
<div dir="ltr"><a href="https://www.naturalearthdata.com/" id="LPlnk">https://www.naturalearthdata.com/</a><br>
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<a href="http://www.soest.hawaii.edu/pwessel/gshhg/" id="LPlnk">http://www.soest.hawaii.edu/pwessel/gshhg/</a><br>
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<div>Also look here for other data:</div>
<div><a href="https://www.justmagic.com/GM-GE.html" id="LPlnk">https://www.justmagic.com/GM-GE.html</a><br>
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<a href="https://argo.ucsd.edu/data/data-visualizations/marine-atlas/" id="LPlnk">https://argo.ucsd.edu/data/data-visualizations/marine-atlas/</a></div>
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<div>Info on ship locations is pretty widely available from sites like:<br>
<div><a href="https://www.vesselfinder.com/historical-ais-data#position_data" id="LPlnk">https://www.vesselfinder.com/historical-ais-data#position_data</a><br>
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<div>for data on territorial seas, EEZ's etc, to refine your area calculations:</div>
<div><a href="https://marineregions.org/downloads.php" id="LPlnk">https://marineregions.org/downloads.php</a><br>
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<div><br>
<div dir="ltr">Open the coastlines in QGIS.<br>
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<div dir="ltr">Create a new, empty polygon layer, and make it editable.</div>
<div dir="ltr">Draw new polygons covering the regions you'd want to deploy the buoys. Up to you how precise they are.</div>
<div dir="ltr">Remove (difference) any EEZ or territorial sea regions you feel appropriate<br>
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<div dir="ltr">Get the remaining cumulative area of the polygons. <br>
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<div dir="ltr">I think there are plenty of guidelines on how to do this sort of things, or feel free to contact me direct if you have questions.<br>
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<div dir="ltr">Current & wind info is around - see the tracks of ARGO floats as one case in point<br>
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<div dir="ltr">But note: <br>
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<ol>
<li><span>The bouys would need to NOT be a hazard for shipping. <br>
</span></li><li><span>Controlling stability (direction of reflection) could be problematic.<br>
</span></li><li><span>The reflected light would need to NOT be a hazard to overflying aircraft.</span></li></ol>
<div>And a question - why would these mirrors only be deployed at sea? The warming is happening to land as well. Surely there are substantial areas of land that could be used in the same way with minimal ecological or social damage - thinking of Australia,
Africa, South America, Middle & Far East. Like carbon credits - set up solar reflective farms to offset climate change.
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<div dir="ltr">Cheers</div>
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<div dir="ltr">Brent Wood<br>
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<div dir="ltr"> <span style="font-size:13pt"><span style="font-family:Carlito">G'day there,
</span></span><span style="font-size:13pt"><span style="font-family:Carlito">all,<br>
</span></span></div>
<div dir="ltr"><span style="font-size:13pt"><span style="font-family:Carlito"><br>
QGIS just discovered. Oh. Wow.<br>
<br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito">Jennifer of Chermside Oz here, with two que</span></span><span style="font-size:13pt"><span style="font-family:Carlito">stions of a very generic nature.</span></span><span style="font-size:13pt"><span style="font-family:Carlito">
Sorry.<br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito">Before I commit a big slice of my remaining life-span trying to mistress GIS via Q,
</span></span><span style="font-size:13pt"><span style="font-family:Carlito">can I ask:</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito"> 1/ is Qgis in tandem with any known DB capable of providing me an accurate fine-grained result on the
<span style="font-weight:bold">area</span> of just the oceans, all of them, 360° round, that lie between the ancient Greeks Tropic zone, in my case either
<span style="font-weight:bold">±45° lat or ±50°.</span> It's the granularity that I n</span></span><span style="font-size:13pt"><span style="font-family:Carlito">eed.</span></span><span style="font-size:13pt"><span style="font-family:Carlito">
</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><span style="font-size:13pt"><span style="font-family:Carlito"><span style="font-style:italic">(2° grid good, tighter ideal.)</span></span></span></span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
<br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito"> 2/ if
</span></span><span style="font-size:13pt"><span style="font-family:Carlito">Y</span></span><span style="font-size:13pt"><span style="font-family:Carlito">es, what would be your rough assessment of the time it would take for this tech-head, in Mac since Syst
0.9 ancient crone</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><span style="font-size:13pt"><span style="font-family:Carlito">,
</span></span>who is not fluent in any code or language </span></span><span style="font-size:13pt"><span style="font-family:Carlito"><span style="font-size:13pt"><span style="font-family:Carlito"><span style="font-size:13pt"><span style="font-family:Carlito">to
pull out an answer</span></span>, </span></span>or</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito"> 3/ again if Yes, and faster, is anyone willing to give this poor pensioner
<span style="font-style:italic">(cue the strings & harps) </span>a price on your digging out this dat</span></span><span style="font-size:13pt"><span style="font-family:Carlito">a?</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito">This because I believe that after 20 years of head scratching after the shock of first seeing the 200 year plot of CO2 in the atmosphere, and being an old radio tech recognizing a
+ve feedbac</span></span><span style="font-size:13pt"><span style="font-family:Carlito">k curve, think that with my 5th concept<span style="font-style:italic"> (four failures)
</span>I've gotten a winner that should stop ocean heating.</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
</span></span><span style="font-size:13pt"><span style="font-family:Carlito">Reflecting enough incoming insolation back out to level the EEI, and perhaps even reversing the heat build up. All done with 98% reflective buoys launched at strategic points onto
passing currents, so they stay mostly in the Tropic zones. I need a scientifically valid referable source of accurate areas data to calc how many bouys are needed. All CC & open sour</span></span><span style="font-size:13pt"><span style="font-family:Carlito">ce,
so not much followup cash flow.</span></span><span style="font-size:13pt"><span style="font-family:Carlito"><br>
<br>
Hope someone can see a solution. Short of measuring my old 300mm inflatable home globe!<br>
Google Earth has proved accurate to establish gross areas (+0.3%, my measuring, 10° x 10° grids.)<br>
Need far better info, so as to not be dismissed out of hand.<br>
<br>
Cheers<br>
<br>
Jen<br>
</span></span><br>
<div style="text-align:center"><span style="font-size:9pt">Ms Jennifer Cluse 35 Reinhold Cres Chermside Qld 4032 Australia UTC+10</span><span style="font-size:9pt"><br>
</span><span style="font-size:9pt">t: 07 3359 5352 <span style="font-style:italic">
(msg</span>) Intl: +61 7 3359 5352 m: 0447 400 470 e: jencluse et iinet + net & au</span><br>
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<span>Brent Wood<br>
<font color="#1793d2">Principal Technician - GIS and Spatial Data Management</font><br>
<font color="#1793d2">Programme Leader - Environmental Information Delivery</font><br>
+64-4-386-0529<br>
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National Institute of Water & Atmospheric Research Ltd (NIWA)<br>
301 Evans Bay Parade Hataitai Wellington New Zealand<br>
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