[mkgmap-dev] [PATCH] Creating contour lines from DEM data

Sat Jul 4 22:54:59 BST 2009

What I actually do is to include the contour lines into the IMG file,  
because that works best for me. If you put them into a separate IMG  
file and then the polygons into a separate IMG file and also the ways  
into their separate IMG file you can create layers and control the  
draw order - in a way. We just lately had a discussion about this on  
the mailing list, see the thread 'Option "preserve-element-order"'.

Regards
Thilo

Am 04.07.2009 um 22:42 schrieb Christian Gawron:

> Thilo Hannemann schrieb:
>>>
>>> I think using one IMG has the advantage that using a TYP file you  
>>> can specify the drawing order (first the "background" polygons,  
>>> than the contours, then the streets).
>> Actually, using different IMG files will allow you to do that, but  
>> with one IMG file for everything it will be difficult. You cannot  
>> specify the drawing order of ways in the TYP file, only of  
>> polygons. And as I understand it, it is not easy to control the  
>> drawing order of ways in any other way. Nop seems to be able to do  
>> it by controlling the order the ways are written into the IMG file,  
>> but I was largely unsucessfull using that method.
> But if you put the IMG with the contours on top, wouldn't the  
> contour lines be on top of the ways? And if you do it the other way  
> around, wouldn't the background polygons (eg. forrest) hide the  
> contour lines? How did you solve this?
>
> I actually tried using separate IMG files first, but I didn't get  
> "nice" results, so I used XInclude to include the contour lines from  
> the OSM file (before I wrote the code to create the contour lines in  
> mkgmap).
>
> Best wishes
> Christian
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