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unfolded/creaseless charts



 
 
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  #21  
Old September 19th 04, 02:04 AM
Dave Jacobowitz
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Okay, I don't want to be the cause of any bad mojo on this group, but
I appreciate the links. I actually did not know that high res .tiff
files were available for the charts.

It's too bad they're not available in some vector format, because
making a seriously huge printout would be rad!

thanks,
-- dave j

Kyler Laird wrote in message ...
"Peter Duniho" writes:

Sure, any print shop should be able to handle the sectional images.
http://weborder.kinkos.com/start.cgi


I went to that link and could not find any offer to print sectional images.


It says that they handle standard formats. I'd expect you to realize that
TIFF is fairly standard.

Maybe you could be more specific? Where, exactly, is one supposed to get
the images for Kinkos (or any other print shop) to print?


It's difficult for me to believe that you've never seen the FAA sectional
images nor were you able to find them, but...
http://aviationtoolbox.org/raw_data/...onals/current/

--kyler

  #22  
Old September 19th 04, 02:25 AM
Dave Jacobowitz
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Kyler, thanks for the links. These files are exactly what the doctor
ordered. I know you've worked on squishing sectional edges together
intelligently. Does getting the North/South charts to print on the
same side of the same page require this mathe magic, or can it be
arranged just by lining them up carefully in photoshop before sending
to a print house?

-- dave j


Kyler Laird wrote in message ...
"Peter Duniho" writes:

Sure, any print shop should be able to handle the sectional images.
http://weborder.kinkos.com/start.cgi


I went to that link and could not find any offer to print sectional images.


It says that they handle standard formats. I'd expect you to realize that
TIFF is fairly standard.

Maybe you could be more specific? Where, exactly, is one supposed to get
the images for Kinkos (or any other print shop) to print?


It's difficult for me to believe that you've never seen the FAA sectional
images nor were you able to find them, but...
http://aviationtoolbox.org/raw_data/...onals/current/

--kyler

  #23  
Old September 19th 04, 03:11 AM
Kyler Laird
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jay somerset writes:

A better proposition would be to get a high-density digital version and
print it at the "size to page" setting.


They won't fit together at the borders perfectly, as each is an
independent Lambert conformation, which distorts them to provide the
best two-dimensional map.


Fitting them together isn't a problem. (O.k., it *is* a problem, but it's
one that's solved in a straightforward way.) They're georeferenced.
https://aviationtoolbox.org/Members/...s/map_explorer
The problem is that things are in different places on different sectionals
so they don't line up well.
https://aviationtoolbox.org/Members/...selected.y=314

--kyler
  #25  
Old September 19th 04, 05:54 AM
Chris W
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Dave Jacobowitz wrote:

It's too bad they're not available in some vector format, because
making a seriously huge printout would be rad!



I'm not sure what you mean by seriously huge but did you see the size of
the tiff files? If you were to print them at 150 DPI you would have a
27 x 80" map. For a map like this even 72 DPI would look good and that
would be over twice the size. That seems pretty huge to me.

--
Chris W

Bring Back the HP 15C
http://hp15c.org

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  #26  
Old September 19th 04, 07:52 PM
Chris W
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Dave Jacobowitz wrote:

Kyler, thanks for the links. These files are exactly what the doctor
ordered. I know you've worked on squishing sectional edges together
intelligently. Does getting the North/South charts to print on the
same side of the same page require this mathe magic, or can it be
arranged just by lining them up carefully in photoshop before sending
to a print house?


I did some playing with the dfw sectional and after stretching the south
image about 15 pixels wider I did the cut and past and a little tweaking
of the text in the overlap area and came up with this

http://cdw.homelinux.com:8087/Dallas-FtWorth72.jpg

keep in mind that this jpg is 9MB and my upstream speed isn't all that
good so it will take some time to download it. The image is about
11,000 by 8,000 pixels

--
Chris W

Bring Back the HP 15C
http://hp15c.org

Not getting the gifts you want? The Wish Zone can help.
http://thewishzone.com

  #28  
Old September 20th 04, 05:11 AM
Kyler Laird
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Chris W writes:

I did some playing with the dfw sectional and after stretching the south
image about 15 pixels wider I did the cut and past and a little tweaking
of the text in the overlap area and came up with this


Oh! I almost forgot...I made these for my moving map experiment awhile
ago.
http://aviationtoolbox.org/munge/data/square_chunked/
JPEG versions are here.
http://aviationtoolbox.org/munge/dat...nked/1350_PPD/
(There are 1350 pixels per degree).

Just pick the square by the longitude and latitude of the upper left
hand corner. They should fit together easily.

They're not, however, Lambert Conformal Conic anymore. Don't try to
plot a route on them.

--kyler
  #29  
Old September 20th 04, 05:34 AM
Ben Jackson
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In article ,
Kyler Laird wrote:
They're not, however, Lambert Conformal Conic anymore. Don't try to
plot a route on them.


What are they? They seem squished vertically. Is that the projection
or some non-square pixel thing?

--
Ben Jackson

http://www.ben.com/
  #30  
Old September 20th 04, 02:11 PM
Kyler Laird
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(Ben Jackson) writes:

They're not, however, Lambert Conformal Conic anymore. Don't try to
plot a route on them.


What are they?


I'd call it "unprojected latitude and longitude."
http://www.colorado.edu/geography/gc...f/threepro.gif

They seem squished vertically. Is that the projection
or some non-square pixel thing?


On the sectionals the pixels represent (approximately) 63 x 63 meters.
In these images they represent 1/1350 x 1/1350 degrees.
http://www.colorado.edu/geography/gc...if/nalccna.gif
This reprojection is certainly going to provide a distorted image. The
distortion seems to be less at lower latitudes.
http://aviationtoolbox.org/munge/dat...nk_-100_25.jpg

I'll leave it to someone else to explain exactly how meters per degree
of latitude changes in a conic.
http://www.colorado.edu/geography/gc...if/nalccna.gif

Of course if you're just making a pretty map of some area using basic
image manipulation software, you can simply un-squish it to your taste.

--kyler
 




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