Portolaan

Program

Datafile

Angelino Dulcert 1339

Data provided by Dagobert

A global fit with errors of upto 63 km

dulcert1339

A much better local fit with a mean error of 17 km

dulcert1339-wm

A smaller region with an error of 5.5 km

dulcert1339-fm

Here a mean error of 11 km

dulcert1339-sw

Combined fit with 10 pieces and an error of 20 km

dividedfit10

Here are the identified locations in Google Earth, where their geographical coordinates were set

Here we have a long piece of coastline that fits very good on a very primitive mapping method: each place along the coast is mapped with the real distance and wind direction relative to its predecessor. This fits better than the conventional projections like Mercator or Lambert, with a mean error of 24.5 km over the whole coastline.

Here we fit all data with 4 pieces of this mapping, where each piece can have its own scale and direction

 

Advertisements

One thought on “Portolaan

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s