[mkgmap-dev] Terraced/pixellated coastline with --precomp-sea

Sat Feb 18 10:24:33 GMT 2017

Hello,

I am trying to switch to --precomp-sea instead of generating the coastline
directly from OSM data.

For higher zoomlevels this works fine. For lower zoomlevels (scale in
basecamp >=5km) the coastline appears heavily terraced/pixellated. Playing
with parameters like poly reduction did not change this behaviour. Here's a 
screenshot <http://www.wanderreitkarte.de/download/coastline_steps.png>  .
The real coastline from OSM data is visible as a dotted line.

The coastline generated from OSM at the same zoomlevel looks somewhat jagged
from polygon reduction, but is not terraced in any way.

mkgmap versions: 3366 and 3796
sea file downloaded from  mkgmap page
<http://osm2.pleiades.uni-wuppertal.de/sea/latest/sea.zip>  , 13.2.17
command line:

java -jar mkgmap.jar --tdbfile --preserve-element-order
--precomp-sea=p:\Input\sea.zip --generate-sea -c osmc_options 

There are no sea parameters in the option file, poly reduction is at default
levels.

Any ideas?

--
View this message in context: http://gis.19327.n8.nabble.com/Terraced-pixellated-coastline-with-precomp-sea-tp5891553.html
Sent from the Mkgmap Development mailing list archive at Nabble.com.