Hi All:
I always add a scale bar to a printed map so that if there is variaition
between the pdf/print configuration, It can always be confirmed on the
final printed map.
Kirk Schmidt
On 5/27/2021 4:27 AM, [email protected] wrote:
Hi John,
as I understand it, you created the base map in QGIS. If you use the
measure tool in QGIS to get the distance between two distinct features
in the map (e.g. road intersections) and then measure the same
distance on the printed base map with a ruler, it should be possible
to calculate the scale. Maybe use two distances, one aligned more or
less horizontally and one vertically, to check if the scaling is
proportional.
As Andreas pointed out, it is probably a problem with the settings
when the PDF was printed. In my experience it is a good idea to go to
print shops usually working for architects and engineers since they
are familiar with the importance of scaling (for advertising etc. it
is more important that the whole content is printed, so that scaling
might be used to fit the output to the printable area without
potential cropping).
You can print directly to a plotter in QGIS if you have access to the
device, avoiding the PDF detour.
EPSG 2264 should be fine. Units should be US feet.
Regards
Jochen
Am 27.05.21 um 07:15 schrieb John Antkowiak:
Hi. This plan was too simple to fail - but it failed. The charity
whose project this is needed a large (that is... massive) paper wall
map on which to plot and rethink its delivery driver assignments.
Both drivers and delivery addresses are subject to change from week
to week but it's not a pizza delivery; this is a regular run to
supply people in a bad way. So the plan was to print the base map
(roads and road names and county boundaries only) and then print 8.5
x 11 address maps with parcel data and orthos. That way, the base
maps don't change but the physical parcel layer is flexible. (On top
of that is a third paper layer indicating which drivers go where so
someone can stand back and take in the whole picture graphically. Not
a cutting-edge state of the digital art solution, but not everyone is
cut out for that. It is what it is.) In order for this to work, the
parcel maps have to be the same scale as the base map. Which they
were... in QGIS.
We have to convert all the maps to PDF to print them, and we had to
send the base map PDFs to FedEx/Kinkos to print the 9 map grid panels
at 42" by 62" each.
When we got the big base maps up on the wall, we discovered the scale
did not match the 8.5" x 11" parcel maps output to PDF and printed
from home. It's not off by a lot, but it's enough to be painfully
obvious from a single standard size sheet of paper. I don't know how
to reverse engineer the big map scale precisely enough to enter a new
scale number in the QGIS Print Layout. I didn't foresee it because
this never would've been a conceivable scenario at the engineering
firm where I picked up my meager GIS skills. (ArcMap sent a map
directly to the plotter without interim steps.) There was no scale
bar on the map. It shouldn't have been needed for this.
Did something happen to the map scale when QGIS output the map to
PDF? Could the size of the image on the pdf page have been adjusted
manually or otherwise when being sent to a plotter with 42" paper?
Could the image have been distorted horizontally differently from
vertically? For the life of me, I cannot trial-and-error guess at a
scale to enter. I've gone through dozens of new 8.5" x 11" test maps
trying to guess the correct scale.
Any ideas?
Thank you all -
John A.
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--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: [email protected]
Web: www.nortekresources.com
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