Sequence/priority of map symbols?

[ulfbrasjo]

In OOM, what determines the sequence/priority of map symbols? Symbols are printed on top of each other, but what determines which symbol is on top and which come under and in which order?
I work with a map and e.g. the symbol for inpassable cliff comes UNDER the contour lines! Can I change the order? Is the order defined in the symbol set? Can/should I manipulate it? (My map has been imported from OCAD, can that cause the problem?)

[pkturner]

Each symbol has a definition of how it is drawn, with one or more parts, each part having a color code. If you look at the table of color codes, you will see which goes on top. Some color codes cut away all colors below them.

This system often cleverly provides convenient and nice effects, such as when one large road crosses another. At other times the results are not desired, but to try to fit it to one's own idea of "just right" can waste time.

[dg0yt]

IOW, the order of symols is undefined. The order of the individual colors is defined.

[ulfbrasjo]

Thx for the clarification! Checked my symbols and saw some strange duplicates with different priorities, explaining the anomalies. Now just wondering if I could replace my existing symbol set with a proper one without getting any "orphant" symbols?

[dg0yt]

There is a Replace-symbol-set operation, and it can help to normalize and reduce symbols and colors.

However, by replacing symbols and colors, it can significantly change the appearance of the map: Past editors may have used the map symbols in a way which depends on the specific order of colors and the composition of symbols.

So you probably cannot avoid doing some manual revision and cleanup. Keep a good set of backups of the original map and of important milestones in the process.

[mlerjen]

Here is the relevant IOF document.
https://1drv.ms/b/c/663580750d0c0bce/IQDOCwwNdYA1IIBmucgAAAAAAZMEa7rqxOkElgllAz-K-ZA

The cliffs should be on top of the contours, so check the color order of your symbol set [and pray that changing it won't evoke total chaos].