Collected Hints, Difficulties and Issues with ISSprOM2019 Symbol Conversions

This page was installed by Convenor of the ONZ Mapping Committee, and last updated on 24 Aug 2019. It consists of snippets harvested from mapper discussions from 2019. Just a temporary page and not a pretty one, we'll revise or supplement the ONZ website stuff in due course. Send us your successes, failures, by email or posting on Maptalk.

Recent additions: New page. Latest items will be put at the top of each section.

See also a related page dealing with ISOM2017 as some of the same issues apply.

Small detailed things that need a tooth-comb inspection

  • Michael W: The OCAD CRT changes the boulder field single triangle to a boulder cluster triangle. Not the same thing, and its bigger, so will create a mess. Looks like an oversight, will report to OCAD.
  • This may have resulted from my OHV variations, but the greatest amount of trouble I had came from overlaps of paved areas and open land. When the wrong one ends up on top the boundary isnt in the right place. (I had a coverup paved area which overcame street sidelines etc, a see-thru paved area when I wanted to see the sidelines and also trees on a parking lot, and of course lots of standard yellow.) Can accept that I used lazy drawing habits esp on earlier maps.
  • Michael W: Here's a partial list of symbols that disappear. Requires human (as opposed to automatic) action. Impassable vegetation area and hedge (the green/black one); Boulder field individual symbols; blue cross (unlikely); and perhaps some ISOM symbols that you added (I did) such as grave. My CRT changes these into a purple criss-cross (area), fat purple line, or a Map Issue (points), so they stand out and and I can deal.
  • Michael W: As for ISOM every slope tick has to be examined in case its on a formline; and if so made into a thin one. See hints under ISOM section. In flat areas it may be quicker to change ALL slope ticks to the formline one and then change the full ones singly.
  • Michael W: Depending on your conversion routine (OCAD's converter or using a CRT) some areas might be converted to "area-with-a-border" (perhaps water, paved areas). You can end up with an additional border line which you cant see. You could possibly get a border across a river if you drew it in patches:-))
  • Michael W: The end lengths of some line symbols have been reduced by Mr OCAD (not specified in the spec). So for fences and pipelines the first and last tick/arrow is closer to the end, and the spacing has changed too. So what? Some of the ticks etc will now end up at sharp bends and the object looks bad. I think the only remedy is insertion of a corner vertex or a dash vertex.
  • Michael W: The small tower has been redrawn with its centroid at 0.0 (it wasn't before). The net effect is that all the "T's" will move slightly south (perhaps 0.3mm).
  • Michael W: While the green circle shrank a bit to allow for its white halo, the green cross didn't, and it may clobber something nearby. The outside measurement of the circle halo is 1.2mm, the cross white outline is 1.6mm E-W and N-S, and 1.8mm on the diagonal. I think all the U and V symbols have grown a bit.

Broader map-wide issues

  • Michael W: There is ongoing update to the OCAD symbol and colour sets (as errors are discovered). If you are relying on a version 11 symbol set from this website, this was re-obtained from OCAD on 10 Aug 19, dont use earlier ones that were here.
  • Michael W: The OCAD symbol set brings in the CMYK colour recipes from the ISOM Spec Appendix 1. These are intended for offset printing and may or may not look right on your digital printer. Under discussion with OCAD and IOF.
  • Michael W: The colour numbers and their order have changed. I dont think you can just wheel in the colour table you had before. The good news is that the colour table uses the same colour numbering (but not colour order) as ISOM2017-2.
  • Michael W: The symbol numbering has changed. This makes pasting in or importing a bit of another map messy - you end up with multiple symbol definitions and multiple colours too. I import all the time to get logos and legends. The damage was done with ISOM, but at least the ISSprOM numbering is now consistent with ISOM.
  • Michael W: The OCAD symbol converison tool looks attractive. The bug whereby additional symbol numbers from the old file, if also used by the new symbol set, get scrambled, I think is fixed. But all of these additional symbols bring through their old colour numbers, which need to be rationalised with the new.
  • Malcolm I/Bryan T: There werent any minimum banks, rockfaces and cliffs in the ISSOM, but if you defined your own in the symbol editor you will probably have had their tags pointing down. The ones in the new symbol set point uphill.
  • Both Michaels: Though not as important as ISOM where the meaning of some symbols changed, all maps should be clearly marked to indicate which mapping standard applies.
  • Michael W: As for ISOM maps, many maps have undersize symbols and conversion will enlarge them. Gaps may get smaller. Legibility has a lot to do with the gaps between colours. And the new spec has a lot of minimum spacings and line lengths which dont get checked. Completely separate from this is that older orienteers deserve a substantial enlargement relative to the elite orienteers to whom the spec is targeted.