Hi again John,
Another thing: what projection (CRS) did you use? Not all CRS are
suitable for printing to scale - esp. the Web Mercator projections are
often not suitable.
Greetings,
ANdreas
On 2021-05-27 08:20, Andreas Neumann wrote:
Hi John,
A very common error when printing PDF maps (regardless of the software
that generated the PDF), is that the print shop scales it down to fit
the "printable" area. Then you end up at somewhere around 95% (plus /
minus) a bit
The PDF viewers (at least the Acrobat one) has a setting to print at
100% (but this is not the default) - it has to be done consciously.
However, this normally scales uniformly, not separately for width and
height.
On the topic of "base maps":
Can you explain what source/mechanism for "base maps" you used? Are you
refering to "tiled" maps, perhaps consumed through the OpenLayers
plugin? This plugin is a known to be a source of error for
misalignments and the plugin should be avoided. Even if you didn't use
this plugin, I have to say that tiled base maps (e.g. consumed by the
quick map services plugin or otherwise) are usually not suited for
printing as their resolution is optimized for screen viewing. Printing
these tiles would result in disappointing quality.
Greetings,
Andreas
On 2021-05-27 07:15, John Antkowiak wrote:
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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