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[mkgmap-dev] mkgmap r4025 implements --x-dem-poly option

From Henning Scholland osm at hscholland.de on Sun Dec 31 10:53:43 GMT 2017

Hi Gerd,

I got an OutOfMemory exception (see below) while reading zipped 1" SRTM
files in Scandinavia. Unzipped it's all fine.

Btw. it would be nice to move the 'DEM file calculation for ... took 265
ms'-messages from stdout to logging Information.


Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.nio.HeapByteBuffer.<init>(Unknown Source)
    at java.nio.ByteBuffer.allocate(Unknown Source)
    at uk.me.parabola.mkgmap.reader.hgt.HGTReader.<init>(HGTReader.java:90)
    at uk.me.parabola.imgfmt.app.dem.DEMFile.calc(DEMFile.java:47)
    at uk.me.parabola.mkgmap.build.MapBuilder.makeMap(MapBuilder.java:334)
    at uk.me.parabola.mkgmap.main.Main.endOptions(Main.java:617)
    at uk.me.parabola.mkgmap.main.Main.mainStart(Main.java:136)
    at uk.me.parabola.mkgmap.main.Main.main(Main.java:107)

On 28.12.2017 18:18, Gerd Petermann wrote:
> Hi all,
> see http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4025
> this is useful if you create a map for a country extract like nepal (nepal-latest.osm.pbf)
> Here is a screenshot of a map created with the option --x-dem-poly=nepal.poly 
> http://files.mkgmap.org.uk/download/378/nepal-with-poly.jpg
> The screenshot also shows some wrong reliefs, and I think I used files without many holes :-(
> So, next step is to find out what goes wrong with DEM in low resolutions. This might take longer, 
> I hope Frank has an idea.
> It seems to be a good idea to use a rather high res for the overview map for now. For the screenshot I used
> --x-overview-dem-dist=276160, with --x-overview-dem-dist=88000 the problems are gone and DEM file is still only
> ~300KB.
> Gerd
> P.S.
> See also http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&path=%2F&rev=4024
> I've moved some messages into the logger, so there will be less noise from mkgmap.
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