How to scale my fiction map?

[anauê]

How to determine the size of a area of my map?
It's the map of fiction world, and this wolrd is the same size of earth.
Is there any software that can help me with this?

thanks in advance

[johnvanvliet]

the placement of landmasses looks a bit "cramped"

you do know that
the left side is -180 degrees West
the right side is 180 degrees East
and that they are the EXACT same place

the land can cross that line

as to size
??????

from a map you first have to have a correctly mapped map

the one on the left is NOT a simple cylindrical map ( it is close ) -- but no cigar

the FREE G.I.S. software QGis ( under the GPL license) can help with the area
http://www.qgis.org/en/site/

[joaodafi]

Has a well-known way to do it, is called mathematics. You could use the estimated square area of a pixel, and then use photoshop or gimp to select the portion of the image you want to calculate, these programs show the number of selected pixels, and then just have to multiply the number of pixels by the represented area in a single pixel.

But a program that calculates the area without much work ... um I think you could use AutoCAD works perfectly to calculate the area of building, would be theoretically equal to calculate the area of continents, but is a very unfriendly program to users without training .

I think it did not help at all ....

[johnvanvliet]

the problem with counting pixels is that as you move towards the poles
the pixels increase but the are dose not

the circumference at 45 north latitude is 1/2 that at the pole

in a simple cylindrical map 45 north latitude has 2 pixels for every 1 at the equator

the projection must be in a equal area projection

then it is just a matter of calculating the area and multiplying that by the size of
Meters per pixel that you are using .

[Azélor]

The other already mentioned some of these points but I'm trying to give a full answer.

Use an equal area projection, like Hammer or Molweide.
Find the total number of pixel for the map.
Select the area your interested in to find the number of pixels.
Divide this number by the total number of pixels found earlier and multiply it by the total area of the world in Km2/miles2/whatever2 (Earth is 510 million km2)


But about the rest, as mentioned already, the eastern and western boundaries don't match if we compare your 2 maps.
In the first one, Sothern have coasts (they are interrupted), but in the other they seems to a part of the same landmasses.

The other thing is about the poles. On a sphere, a pole in just a point. It's a very specific place. But with these map projections, this point is displayed as a line.
Therefore, at 90 degrees of latitude North and South, you should have a full line of land or water but you can't have both, in theory.


It should look like this for the north and south poles.

Attachment 77291
Attachment 77292