Resizing world map to be global in scale when imported into Wilbur

[whitemiasma]

I have found a lot of fantastic information about Wilbur on this site but have not been able to find an answer to this question.

I currently have a 5120x5120 image of my world that was drawn in Photoshop (silly to draw it square, I know). I've imported it into Wilbur, but it is does not cover the entire 'globe' inside the program, even in the square projection, just a much smaller portion. I'm wondering if someone knows of a way to import it as an entire world or what size an image needs to be for Wilbur to read it in as such?

Thanks in advance for any help.

[waldronate]

Use Surface>>Map Info to set the edges of the map to top=90, left=-180, right=180, and bottom=-90. It assumes an equirectangular projection.

[johnvanvliet]

as above

but i am assuming that your square map is in Mercator projection from 85 north to 85 south

this will need re-projecting to 90 north to 90 south and in equirectangular simple cylindrical format
see:
https://en.wikipedia.org/wiki/List_of_map_projections


from this
https://en.wikipedia.org/wiki/Mercator_projection
to this
https://en.wikipedia.org/wiki/Equire...lar_projection

[whitemiasma]

Thanks for the response. I used worldengine to get an idea of what my continents will look like, and it outputs a 512x512 image but I could not find any documentation regarding the projection. It is probably safe to assume it is as you said. Is there an easy way to go about projecting the image to equirectangular? I have access to ArcMap through my job but that might get messy. If the easiest way is to use GIS software I will probably just get QGIS.

[whitemiasma]

Thank you, this was very helpful and more straightforward than I imagined!

[johnvanvliet]

the GPL software Qgis is free
it uses gdal

most of the real world maps i work on are planets and moons in our solar system and use a program called ISIS3 from the USGS and JPL
( also under the GPL license )
there is also a terminal ( type into the terminal) program MMPS
http://www.users.globalnet.co.uk/~arcus/mmps/

or if your map is not too huge
you can post it i then i can convert it

a 5120x5120 pixel map it would take me 10 to 15 minutes

that is a small size so it is no biggie

i am currently working on a 92,160 x 46,080 pixel map of Mercury

[whitemiasma]

Wow, that is huge! I wish I had drawn mine as a bigger size but up-scaling it doesn't seem like a good idea at this point. If you wouldn't mind I would greatly appreciate your help in projecting this. I've included the image below.
World_B&W2.png

[johnvanvliet]

here you go


90 n to 90 s and -180 to +180

[whitemiasma]

Thank you very much!