[mkgmap-dev] precomp sea test environment

Hi all, today I stumbled over a bad sea.zip file that was created in 2019-11-08. Most of the two Americas was flooded. I wondered if I should add some code to mkgmap to detect this case? Eg. mkgmap could check some points which are clearly inside continents. Besides that it is rather simple to produce a test style for the sea which just creates an overview map. I've created some empty tiles which cover full planet and used them to create an overview map containing only sea polygons. This compilation takes ~1 minute. A quick glance at osmmap.img should show the familiar shapes of the continents, if not something is wrong and that probably means that the precomp-sea data is bad. I've attached this, maybe it is of some help. Gerd