Hi Andrzej, sorry for my stupid error and thanks for the patch. I kept the double because I compared the results with those from class InterpolationBilinear, but I agree this should not be used in the final code. See http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4043 Maybe I should change all values to int, maybe that is a bit faster. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej@poczta.onet.pl> Gesendet: Mittwoch, 10. Januar 2018 14:33:40 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] HGT - getElevation() Hi Gerd, I see you have introduced NO_VAL constant in recent code. Please note, then my interpolation code can return (double)HGTReader.UNDEF too, when it returns nearest HGT value, which happened to be void. I think more clear would be to move Math.round() to interpolatedHeight(), see attached patch. -- Best regards, Andrzej _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev