Polygon Drawing Discussion

[sabelt]

any tips hot to join merge lakes and city park/forest in a proper way?

It would be great if we have a poly section in this forum due to increasing number of mapedit users here....

[tympg]

any tips hot to join merge lakes and city park/forest in a proper way?

It would be great if we have a poly section in this forum due to increasing number of mapedit users here....

To have a polygon node stick better to another polygons' node, make sure

• Stick to Neighbours is enabled
• there are at least 2 levels:
  
  • Level 0=24 bits, zoom=0
  • Level 1=22, 21 or 20 bits, zoom=0 or 1

[sabelt]

Sorry but i dont see any stick to neighbours function in mapedit. Where is it?

[tympg]

any tips hot to join merge lakes and city park/forest in a proper way?

It would be great if we have a poly section in this forum due to increasing number of mapedit users here....

You can also use the Subtract Polygon method, example below:

First draw a Lake polygon:

20081008_tympg polygon wrapping 01.PNG

Then draw a City Park polygon

20081008_tympg polygon wrapping 02.PNG

Hold down the Ctrl Key to also select the Lake polygon

20081008_tympg polygon wrapping 03.PNG

[sabelt]

Cool thanks!

[tympg]

(Continued from above...)

Right-click and choose Subtract Polygons

20081008_tympg polygon wrapping 04.PNG

Et voilà! The City Park polygon wraps around the Lake polygon neatly

20081008_tympg polygon wrapping 05.PNG

[tympg]

Sorry but i dont see any stick to neighbours function in mapedit. Where is it?

Tools > Options... > Edit

[76gpsguy]

You also use the Subtract Polygon method, example below:

Will the common edges of the 2 polygons be separated after compile to img file? Can we consider setting the polygon draw priority in such the way that the lake polygon is on top of City Park?

[sabre23t]

Will the common edges of the 2 polygons be separated after compile to img file? Can we consider setting the polygon draw priority in such the way that the lake polygon is on top of City Park?

When you use the subtract method the two polygons are no longer overlapping at all. They share a common edge/border. One could be even completely within another. Both polygons will show regardless of polygon draw priority.

If we want lake polygon to draw on city park, we have to be sure that in all (or almost all cases) we want lake polygon to be on top of city park. In this case, I think that might well be true. For the exception, we can use the subtract method when in the rare case of wanting an island city park to be on top of a lake polygon.

[edchuang (retired)]

Really wanted to start polygon drawing after reading all the forums and posts in Mapping Guideline & Standards Discussion. Anyone have extra license for mapedit want to sell? If yes, please let me know so that I can start to learn polygon drawing immediately.