1 reply to this topic

[Alan]

I would like to find or generate a variety of map images in
various world areas that use the Gnomonic map projection (Great Circles
are straight lines). I want to use this as a background for a
simulation that uses a rectangular grid for visualization. I want to
do no calculations (e.g., distance) more complicated that the Great
Circle Distance formula.

Generally, I want to spend most of my time on the simulation
rather than on selecting GIS data and generating a map.

My other desirements are:

- Short learning curve for tool (if one is needed)
- Little time required to find the right data (easily accessible within the tool)
- Quick and easy to generate graphic image (e.g., JPEG or BMP) of desired map area
- Easy to select area and scale of map
- Free or cheap tool and data

Do you have any recommendations on a tool/data or other source for this?

Do you think there is a better way to approach this (besides Gnomonic projection)?

Thanks, Alan

[mdsumner]

I would suggest Manifold www.manifold.net

If you're up for it, you also do this with a combination of GDAL and R (free and open source) - but much greater learning curve than Manifold.