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Discussion: 5000 Maps - resize Symbols

in: Orienteering; General;

Oct 31, 2015 11:30 AM # 

i'd like to create a 5000 scale forest map. I use the ISOM 10000 symbol set.

Do I have to resize the symbols?

best wishes,
Oct 31, 2015 12:35 PM # 
No, unless you're creating an ISSOM map in which case you need to redo your symbol set.

Someone is now going to tell me that 1:5000 doesn't exist in ISOM.
Oct 31, 2015 1:51 PM # 
Around here, we've reinvented the "short distance" as similar to the sprint, but in terrain that doesn't allow "very high speed running in very runnable parks, streets or forests." Typically slower, but feature-rich areas. These are generally non-urban, but we also have parks and reserves on steep land within cities.

The beauty of the short distance (in the meantme) is that there are no rules. We're using the ISOM symbol set. The ISOM itself makes a brief reference to large scales in the context of education, suggesting 150% of std symbol sizes (as for 1:10,000). Sometimes larger symbols look nice, but not proportionally larger. For example a recent event used 200% symbols at 1:5000.

I think that participants need to be clearly advised that standard orienteering rules apply, in terms of "allowed to cross" features.
Oct 31, 2015 2:47 PM # 
I made this table recently. I didn't like 300% symbols at 1:5000, so I was trying to see what a good "enlargement" might be for local maps that get used at a variety of print scales:

1:10 1:5 1:7.5
100% 200% 150%
150% 300% 225%. "IOF spec"
125% 250% 188%
133% 267% 200%
120% 240% 180%
for comparison:
75% 150% 113%

As an example, for 120% at 1:10000, you start with a 1:15000 map with 1:15000 symbols (it can be a blank map), then change scale to 1:12000 and check the box to enlarge the symbols. Then you change scale to 1:10000 and uncheck the box. At that point you can just select the correct print scale: 1:10, 7.5, 5, or 4 and see what it looks like. (This is for OCAD 8—it might be different now.)

I typically adjust the screen symbols back to a normal size if they look too coarse.
Nov 1, 2015 8:29 PM # 
We have quite a few maps around Bendigo of small gold mining areas. They have been mapped at 1:5,000. The ISSOM symbol set works fine. Someone has already thought about the size and legibility issues so no need to work through that again. The "forbidden to cross" rules don't cause any issues. If its a serious cliff the rule is useful. If its blackberry thicket, likewise.

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