[mkgmap-dev] Artifacts in final map (.MP -> .IMG conversion)

Fri Feb 8 13:27:29 GMT 2019

Hi Vadim,

I don't know much about the mp format, but If I got that right mkgmap cannot handle holes in polygons, it simply combines the points
and that results in these artifacts.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Vadim <bombur at mail.ru>
Gesendet: Freitag, 8. Februar 2019 13:12
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: [mkgmap-dev] Artifacts in final map (.MP -> .IMG conversion)

Hi!

As a result of conversion *.MP* to *.IMG* with *Mkgmap* (java -jar
mkgmap.jar --mapname=12345678 --family-id=1281 --product-id=1
"AmericanLake.mp"), clearly expressed artifacts appear in the resulting map:

<https://b.radikal.ru/b07/1902/89/31a7f4de23d0.png>

If convert the same .MP-file using *cGPSmapper.exe*, such artifacts do not
appear:

<https://b.radikal.ru/b25/1902/62/de23809b837d.png>

I suspect the reason is rather in the source .MP file:
* Multipolygons consist of several hundred points.
* The GPSMapEdit program finds intersections and overlays of polygons:
http://b.radikal.ru/b29/1902/34/8177994b7e98.png
* In addition, after converting multipolygons to polygons (deleting internal
polygons from the file used), the artifacts disappear. But it is impossible
to use a map (some objects such as islands and hills disappear) obtained in
this way:

<https://a.radikal.ru/a42/1902/94/0b9aeffc449e.png>

However, despite possible problems with the source file, *cGPSmapper.exe
converts it without any problems* !!!

Is there a way to get *Mkgmap* to convert this file ?
Maybe there are some "secret" command line parameters ?
I tried unsuccessfully these arguments:
--reduce-point-density=
--reduce-point-density-polygon=
--order-by-decreasing-area
...

Generalization in GpsMapEdit not helped...

Original *.MP* file posted here: https://yadi.sk/d/c5-7lv8v-Ubvzw

Thanks for any advice and suggestions!

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