[Qgis-user] On the capabilities of QGIS

[Brent Wood]

Hi Jennifer from West Island,
from someone else from down under.

I'm not sure this is a simple exercise, or that you'll get any better precision than 0.3%, but...

I'd grab any reasonable world map dataset, natural earth, GSHHG, etc...
https://www.naturalearthdata.com/
http://www.soest.hawaii.edu/pwessel/gshhg/

Also look here for other data:
https://www.justmagic.com/GM-GE.html
https://argo.ucsd.edu/data/data-visualizations/marine-atlas/

Info on ship locations is pretty widely available from sites like:
https://www.vesselfinder.com/historical-ais-data#position_data

for data on territorial seas, EEZ's etc, to refine your area calculations:
https://marineregions.org/downloads.php


Open the coastlines in QGIS.
Create a new, empty polygon layer, and make it editable.
Draw new polygons covering the regions you'd want to deploy the buoys. Up to you how precise they are.
Remove (difference) any EEZ or territorial sea regions you feel appropriate
Get the remaining cumulative area of the polygons.
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.

Current & wind info is around - see the tracks of ARGO floats as one case in point

But note:

  1.  The bouys would need to NOT be a hazard for shipping.
  2.  Controlling stability (direction of reflection) could be problematic.
  3.  The reflected light would need to NOT be a hazard to overflying aircraft.

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.

Cheers

Brent Wood


 G'day there, all,

QGIS just discovered. Oh. Wow.

Jennifer of Chermside Oz here, with two questions of a very generic nature. Sorry.

Before I commit a big slice of my remaining life-span trying to mistress GIS via Q, can I ask:

    1/ is Qgis in tandem with any known DB capable of providing me an accurate fine-grained result on the area of just the oceans, all of them, 360° round, that lie between the ancient Greeks Tropic zone, in my case either ±45° lat or ±50°. It's the granularity that I need.  (2° grid good, tighter ideal.)

    2/ if Yes, what would be your rough assessment of the time it would take for this tech-head, in Mac since Syst 0.9 ancient crone, who is not fluent in any code or  language to pull out an answer, or

    3/ again if Yes, and faster, is anyone willing to give this poor pensioner (cue the strings & harps) a price on your digging out this data?

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 feedback curve, think that with my 5th concept (four failures) I've gotten a winner that should stop ocean heating.

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 source, so not much followup cash flow.

Hope someone can see a solution. Short of measuring my old 300mm inflatable home globe!
Google Earth has proved accurate to establish gross areas (+0.3%, my measuring, 10° x 10° grids.)
Need far better info, so as to not be dismissed out of hand.

Cheers

Jen

Ms Jennifer Cluse  35 Reinhold Cres  Chermside  Qld  4032  Australia  UTC+10
t:  07 3359 5352 (msg)  Intl: +61 7 3359 5352   m:  0447 400 470   e:  jencluse et iinet + net & au
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Brent Wood
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Programme Leader - Environmental Information Delivery
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