6 replies to this topic

[Hans van der Maarel]

I need to georeference some data from an existing map in Illustrator. Normally, MAPublisher lets me do that, but I do need to know which projection the map is in. And that's where the fun starts...

I'm guessing it's either Gall or Miller Cylindrical. It's hard to tell because it's cropped on the top and bottom... It's definately off-center, which makes things a bit more difficult.

Any ideas?

 which_projection.jpg   291.45K   96 downloads

[amtait]

I need to georeference some data from an existing map in Illustrator. Normally, MAPublisher lets me do that, but I do need to know which projection the map is in. And that's where the fun starts...

I'm guessing it's either Gall or Miller Cylindrical. It's hard to tell because it's cropped on the top and bottom... It's definately off-center, which makes things a bit more difficult.

Any ideas?

 which_projection.jpg   291.45K   96 downloads

At first glance, it looks like a Gall. Africa is definitely too elongated for a Miller.

[DaveB]

At first glance, it looks like a Gall. Africa is definitely too elongated for a Miller.

I think Alex is right, Gall Stereographic centered somewhere around -20 degrees (or 20 degrees West, if you prefer ).

[rudy]

Gall Stereographic or Miller Modified Gall. They're pretty similar.

[amtait]

Gall Stereographic or Miller Modified Gall. They're pretty similar.

Your earlier posting was a Gall's Stereographic.

[Hans van der Maarel]

Thanks for the comments everybody. I'll give it a try with the Gall Stereographic, see how that lines up.

[Hans van der Maarel]

Well...



Turns out MAPublisher doesn't support the Gall Stereographic projection... So I ended up exporting the relevant information as DXF and then georegistering it in Manifold. Not really a succes due to the relatively small size of the original map as compared to the size I need to work on, so it looks like it'll be a re-do job.