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Some Map Projection Formula Resources

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#1
pbanderson

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- Hi Everyone,

My original Map Projection Formulas post is here:
http://lists.maptool...n/listinfo/proj
But, I thought that it might interest some of you as well!

Links to some of my Map Projection Formula resources are:

- John Parr Snyder's personal software [MSDOS, Quick Basic source code] . While his software is fully functional (send me an e-mail if you want to know more) most people just extract it to a single subdirectory (or Folder) and pull out the formulas (Warning -- John's code is not easy to follow): http://www.csiss.org...ections/snyder/

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German Cartographer Hans Maurer's 1935 map projection catalogue:
http://www.csiss.org...ections/maurer/

== file descriptions ==

- MP_Class.txt 05-Oct-2007 18:19 2.6K
My text from a long forgotten Usenet post - it can also be found here:
http://mapmaker.rutg...onPointers.html

- In the 1930s Hans Maurer published his map projection catalogue. In 1968 someone at Harvard did a literal translation of it from German to English. BTW, you can stil get this english translation from the Library of Congress if you are willing to put out 75 dollars for a very poorly done photocopy.

Note that the Maling PDF document at my map projection web site contains a graphic showing Maurer's classification scheme compared to that of L. P. Lee and Waldo Tobler.

Main document (in 2 parts):
M_1.pdf 05-Oct-2007 18:20 19M
M_2.pdf 05-Oct-2007 18:21 18M

Better copies of the document's graphics (from Dr. Waldo Tobler):
M_G.pdf 05-Oct-2007 18:21 3.0M

My feeble attempt at identifying the Maurer formulas in the context of today's map projection names:
Maurer.txt 05-Oct-2007 18:21 7.8K
Note that any additions or corrections here are welcome.

A seven (7) page table (in German) from the end of the document listing the presented map projections and their formulas. Poorly done in the original photocopy, these 'enlarged' pages were provided to me by Dr. Tobler as paper documents. they are 11x17 page size, and in landscape. I just scanned them to PDF:

page_1.pdf 05-Oct-2007 18:21 281K
page_2.pdf 05-Oct-2007 18:21 266K
page_3.pdf 05-Oct-2007 18:21 273K
page_4.pdf 05-Oct-2007 18:21 244K
page_5.pdf 05-Oct-2007 18:21 251K
page_6.pdf 05-Oct-2007 18:21 271K
page_7.pdf 05-Oct-2007 18:21 254K

======
Tobler

A partial list of Azimuthal equations:
http://www.galleryof...bler/AzEqns.PDF
Note that my math skills are not up snuff in figuring out some of the equations presented. Any help here would be appreciated.

One of the things I've experimented with in the last year is a variation of the Tobler graphic (after gedymin) on page 9 of this reference:
http://www.galleryof...CoordCompP2.pdf

Here is my version, done entirely in ArcGIS 9.2, but, it has problems with all the graticules of the single hemisphere Azimuthals.
http://www.galleryof...edymin_prof.pdf

What frustrates me is that I'm only 2 courses from completing Old Dominion University's 'GIS certificate' and I've had 3 of their courses using ArcGIS. I have yet to learn how to fix my Hemisphere graticule problem. Here are the project files if anyone wants to tinker with it:
http://www.galleryof...gis_gedymin.zip

======
Anderson

Some of MY old stuff:
http://www.csiss.org...tions/anderson/

In particular 'wv.zip' - compiled MSDOS Quick Basic, extract it to any subdirectory (folder) and run 'wv.exe'.

And 'wvsrc_2007.zip', my reasonably readable source code in Quick Basic. While my software is not perfect, the majority of the graphics at my web site were initially created with this software as HPGL files. They were then brought into Corel Draw where I cleaned and sized them before exporting them back out as PDF files. I ran out of room in the MSDOS environment, so I have around 125 more stand alone programs for some of my other graphics.


BTW: I have moved my Map Projection Web Site to a server at the University of California, Santa Barbara.

The new URL is:
http://www.csiss.org...ions/index.html

Take Care,
- Paul B. Anderson FCCS (USN, Retired)
Kingsport, TN native living in Norfolk, VA

#2
Hans van der Maarel

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Thanks Paul, I'm sure that will come in handy to some folks.
Hans van der Maarel - Cartotalk Editor
Red Geographics
Email: hans@redgeographics.com / Twitter: @redgeographics

#3
Clark Geomatics

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Awesome resource Paul - thanks!
Cheers,

Jeff Clark
Principal
www.clarkgeomatics.ca

#4
Greg

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Great stuff, these kinds of resources tend to be invisible when I need them most.

Thanks Paul!
Greg Moore

g r e g @ c a r t o g r a p h i c d e s i g n . c o m
www.cartographicdesign.com

#5
pbanderson

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Hi Everyone,

Just a quick note to those of you who have tried to access the 'csiss.org' links contained in my post since last Thursday. Those servers are currently down due to what is being called the 'Gap fire' in the Goleta section of Santa Barbara, CA. According to the 'UCSB.edu' web site the campus is on emergency power.

I'm hoping that when the Geography Department staff returns after the holiday weekend my map projection material will be back on line. However, it really depends on when the fire there is finally under control.

-PBA




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