KML invert country border

Question

I need invert KML file with Poland country. I need white overlay on other countries, only Poland should be visible. http://cv.bluewolf.pl/kml-map/ I have a problem with converting borders, and place white overlay on the rest of the world. Only one country (Poland) should be visible.

I tried use KML winding reversal tool from geocodezip but i can't find any tutorial or documentation. I tried Mask-KML-polygons from github to transform KML file but this don't work.

Somone could tell me what can I use to get this effect on map? http://www.geocodezip.com/geoxml3_test/v3_geoxml3_NetherlandsInverted.html

I download file from http://www.gadm.org/country > Poland > Goole Earth .kmz and uinzip this to kml file. — marudka, Feb 06 '16 at 16:55
Have you tried reading this? http://stackoverflow.com/questions/2811223/can-i-show-a-single-country-masked-out-in-googlemaps — Android Enthusiast, Feb 06 '16 at 17:15
What problem did you have with the file from [gadm.org](http://www.gadm.org/)? Where is that file? — geocodezip, Feb 06 '16 at 18:58
Yes, I read this. But I don't understand how can I make KML like this exemple. I think I should change something on and tag. But i can't find any tutorial or solution. — marudka, Feb 06 '16 at 19:05

score 3 · Answer 1 · answered Feb 06 '16 at 19:40

According to the winding reversal tool, all the polygons in POL_adm0.kml wind in the negative direction.

name Poland
outer -0.000029027214395682677
outer -0.00011758931589156418
outer -0.00004442846750407625
outer -0.0011201874443713677
outer -0.00001914283006954065
outer -0.0002913248119966738
outer -0.000060512058212225384
outer -0.0055139375892849785
outer -0.000024386593850067584
outer -0.000016341876744263573
outer -0.00001358358349534683
outer -0.00022344898320625362
outer -0.010447627167081919
outer -0.0026826606504073425
outer -0.07199650440122696
outer -0.00004660667070766067
outer -0.007425361581113066
outer -81.8301486672533

All you need to do is add an outerBoundaryIs that winds in the opposite direction and change all the existing outerBoundaryIs tags to innerBoundaryIs tags. Here is an <outerBoundaryIs> that winds in the correct direction:

<outerBoundaryIs><LinearRing><coordinates>
180,85 90,85 0,85 -90,85 -180,85 -180,0 -180,-85 -90,-85 0,-85 90,-85 180,-85 180,0 180,85 
</coordinates></LinearRing></outerBoundaryIs>

Updated KMZ file (displayed on a Google Maps Javascript API v3 map)

Note: It works with native Google Maps Polygons (in geoxml3), but not with KmlLayer.

KML invert country border

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