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Potomaca
The making of an epic map
story, Big-Ass map & photographs by Leslie Strom
Toting, copying, filing, griping and arranging by Dave McBee
WHY I DECIDED TO MAKE AN ENORMOUS MAP
I often think I should start a whole department for Get Lost
magazine called "Big Fat Lies I Tell People." I first
learned the leverage of a great-sounding lie from my old friend
Margaret VanderWaerden, who, years ago was an avid bike tourist
who sometimes enjoyed company on her bike rides, even my peculiar
version of it. She would show me a map where the area in question
was about the size of a postage stamp, point to a blue hair-fine
thread of a line next to some obscure state highway and say,
"Look, it's a river grade! Easy ride." And I'd wind
up in Rainy Pass high in the Cascade mountains wishing for a
lightning bolt to put me out of my oxygen-deprived misery. So
now whenever I hear the words "river grade" I search
out a topo map. I'll probably still go, but I want to know what
fresh hell I'm heading into.
The Chesapeake & Ohio Canal towpath runs 184 miles up
the Potomac from Washington DC to Cumberland, MD. The National
Parks Department has made this area into a contiguous and continuous
skinny park on the Maryland side. Their maps are suspiciously
devoid of topography, and I sure don't fall for that "Look,
it's a river grade!" trick the way I used to. So I decided
to make a map of grand magnitude, by sticking a bunch of USGS
quad maps together.
Delorme mapping company
has a giant globe in the Maine woods called "Eartha"
which rotates in its shining modern gift box of an enclosure.
It's 41 feet in diameter, biggest in the world. I wondered how
big a globe it would be if they had used quadrant maps instead
of satellite shots like we were about to do. (Quick figure...
quads are at 1:24,000 scale, and Eartha is at 1:1,000,000 scale,
so our globe would be 1,715 feet in diameter.) And I wondered
if the Chesapeake and Ohio Canal in DC / Maryland / West Virginia
/ Virginia would fit on my wall. We're not talking a whole state
or anything, just 184 miles of meandering Potomac river.
Desire for a good map of the C&O Canal and towpath...
Look, it's a river grade! caused me to lie outrageously to Get
Lost's own Dave McBee. To make a big-ass map out of USGS quadrants,
I needed help. The Seattle Public Library has a complete (if
a little outdated) set of maps for the whole USA. It might take
an hour to collect and copy the maps, I said.
HOW WE MADE AN ENORMOUS MAP AND NAMED
IT SOMETHING SILLY
(PS - This could have been done much faster with two DeLorme
Maryland atlases and it would have fit on a wall. Don't tell
McBee.)
First we had to fish the maps out of the various state drawers
which took an hour. Then we had to photocopy the Potomac bits
onto 11x17 paper. I don't know about the library in your town,
but the copiers at ours get a lot of use and competition gets
hot. Instead of strong-arming little kids to drop their History
of the Oregon Trail books, we bundled up the nearly 40 maps,
checked them out from a very tolerant reference desk person,
hied to the local Kinkos and $11 later had a stack of about 150
quadrant quadrants (each quad map can be copied in four passes)
that only ("only..." hahaha...) needed to spliced together
later. When McBee finally departed with a sneer at my estimating
abilities, it was three hours gone by.
So I went home with my giant copier-warm stack of map bits,
anticipating another grand project on par with the Visible horse
I assembled last fall, which is sort of like the Visible man
models with the skeleton and innards we did in junior high biology.
And so was spawned "Potomaca." I couldn't make it spin
like DeLorme's Eartha, but I could sure make this impressive
thing that would wow my friends and assure me that no one would
ever shine me on about kayaking, biking or hiking a "river
grade" in THAT neck of the woods.
YOUR CAN MAKE YOUR OWN EPIC MAP AND
NAME IT SOMETHING SILLY
MATERIALS
- Large cutting board or cardboard thing
- Long metal ruler with a cork back
- Exacto blades (lots of them) and a handle
- masking or drafting tape (low tack)
- Scotch tape
- Maps
MAP COMPONENTS
A good choice would be a river, highway or other route that's
likely to fit on your wall. I've noticed that DeLorme state map
books are scaled to make a map that fits an 8 foot high wall
that you may have at home. Get two books to cut up for your mosaic.
You can also photocopy the pages of your book and reduce them
a certain percentage all the same, and you'll end up with a smaller
Big-Ass map. This might actually work for you better, though
if you're using USGS maps the smallest type is already pretty
small. Test the concept first. I did it once with quad maps at
half size for the whole John Wayne Iron Horse trail that goes
across the state of Washington.)
If you photocopy the maps, be sure to give yourself 2 sides
with matchlines to other quadrants, and some overlap to the adjacent
maps. Close the lid on the copier so there is no distortion in
the shape of the map.
FOOLPROOF SPLICING TECHNIQUE
I learned to do this in college, so pay attention.
1. Align - lay the two untrimmed pieces so they overlap and
align them as exactly as you can.
2. Tape - Using masking tape (stick it on your clothing and
pull off a little lint, this will unstickify the tape so it won't
pull the paper apart later) carefully tape the two maps together
on the joint on the FRONT of the map.
3. Cut - with a cork-backed straightedge and exacto, cut through
both pieces in one cut.
4. Toss the bits - Discard the short ends.
5. Tape again - Use drafting tape or fuzzy masking tape and
tape the matching pieces together. They should butt together
perfectly.
6. Flip.
7. Tape it yet again - tape all along the seam with permanent
transparent tape.
8. Flip and peel - Flip your map to the front and remove your
temporary masking tape. Ta-daaah.
Do this a couple hundred more times to complete your epic
map.
Name it something that sounds like a Japanese movie monster.
"Columbinator," for instance, would be a good name
for a map of the Columbia river.
DISPLAYING YOUR BIG-ASS MAP
Because I failed to estimate the finished size before I embarked
on the project, I forgot to book a high school gym in order to
hang it in one piece. However, I did build the thing in quadrants
and horizontal strips so it can all be rolled up and carried
to a likely large floor for temporary viewing.
CARE AND STORAGE OF YOUR BIG-ASS MAP
Don't ask me. I'm only good for getting you INTO trouble.

Leslie Strom shows
no restraint in her quest for epic projects. This affinity for
such things will last as long as there are people like McBee
to dupe into being accessory.
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