Getting rid of inappropriate trees in high-arctic regions

I have created a Polygon for MSFS 2020 Airport Design, that eliminates the inappropriate deciduous tree forest that covers the North Slope of Alaska and the Canadian Arctic, and replaces it with the "SmallScrub" biome. This biome isn't exactly the Arctic Tundra vegetation that you would see in the real world, but it's the closest you can get with the default Asobo library assets. Most importantly, you can now land a bush plane with tundra tires anywhere that is covered by this exclusion polygon without worrying about crashing into autogen trees that don't exist in the real world that far north. I created the polygon in Google Earth, exported it as a KML file, then added the proper SDK attribute tags to the lat/long data, and attached the header from an existing exclusion polygon that had the biome attributes I want. This isn't a perfect solution - the ground colors are still unrealistic - but at least the autogen trees are gone, and the ground cover vegetation is more or less "tundra-like". The polygon covers all of the Canadian High Arctic islands, and a slice of the continental land mass that includes most of Nunavut, the Northwest Territories north of Great Bear Lake, and the North Slope of Alaska north of the Brooks Range. This is not rigorously accurate, but anyone is welcome to refine the polygon to make it's coverage area more precise; just be aware that the BGL compiler imposes a maximum limit of 13,107 vertices on Polygons. Scenery designers are advised to use multiple polygons with fewer vertices if necessary, to stay well below the 13.107 limit. If you would like to try this, take any airport you have designed in the far north, and in the Source XML file, splice in my code block just above the <AIRPORT object. If you have any existing Polygons, make this the last one. It covers 4,878,120 square kilometers (1,422,232 square nautical miles), so you have a huge area of tree-free Artic tundra to explore. If you land somewhere and decide to camp, or just relax for a while, just keep in mind that if it's summer season, your avatar in the sim will be getting eaten alive by simulated mosquitos. 😉

BTW, you do not have to increase your "Airport Test Radius" value. Vegetation exclusion polygons are not part of "airport" data, so the Sim won't care that this polygon is enormously larger than your airport.

<Polygon displayName="tree exclude" groupIndex="6" altitude="0">

<Attribute name="UniqueGUID" guid="{359C73E8-06BE-4FB2-ABCB-EC942F7761D0}" type="GUID" value="{36C272A8-AD90-4345-9EC7-074F4FD28EB3}"/>
<Attribute name="VegetationScale" guid="{6A043F59-E6F2-4117-A2E4-D510E7317C29}" type="UINT32" value="0"/>
<Attribute name="VegetationDensity" guid="{41EFF715-C392-4B31-A457-50A504353A90}" type="UINT32" value="0"/>
<Attribute name="TreeBrightnessFactor" guid="{63040596-0B21-48FD-8B5F-A9E84A5B7BC9}" type="UINT32" value="0"/>
<Attribute name="BiomeName" guid="{E5FA1B20-BB2F-40D5-913B-480C547CC9B8}" type="STRING" value="ScrubSmall"/>

<Vertex lon="-155.2914908493373" lat="68.15237995260851"/> 
<Vertex lon="-149.5871794850976" lat="68.43629545054165"/> 
<Vertex lon="-144.6554214552498" lat="69.24997055846178"/> 
<Vertex lon="-138.4630439225604" lat="66.77073961744587"/> 
<Vertex lon="-134.6636730666596" lat="66.62782832926895"/> 
<Vertex lon="-119.5366350895035" lat="67.16700880076132"/> 
<Vertex lon="-103.8448564838584" lat="64.50576389349278"/> 
<Vertex lon="-92.21432288881323" lat="61.09715597166249"/> 
<Vertex lon="-84.56258474688607" lat="60.30590250843139"/> 
<Vertex lon="-79.28998425487480" lat="61.01413718854442"/> 
<Vertex lon="-78.66847454366531" lat="62.66905542363784"/> 
<Vertex lon="-75.35417541139145" lat="62.63369692759734"/> 
<Vertex lon="-72.57565064418981" lat="62.44471756383010"/> 
<Vertex lon="-64.72532277606648" lat="60.96009610496460"/> 
<Vertex lon="-61.75094386639130" lat="61.90332180394193"/> 
<Vertex lon="-58.85025621101383" lat="65.29542413689802"/> 
<Vertex lon="-64.96612776430141" lat="71.25154508246699"/> 
<Vertex lon="-73.32029428464792" lat="74.81867585083741"/> 
<Vertex lon="-74.46182713722315" lat="77.50284436034669"/> 
<Vertex lon="-72.66326279416352" lat="78.92443722981079"/> 
<Vertex lon="-67.73352160765003" lat="80.51268813959428"/> 
<Vertex lon="-62.58333952664752" lat="81.72501326961340"/> 
<Vertex lon="-59.23234045077193" lat="82.64842795773453"/> 
<Vertex lon="-62.90958458873958" lat="83.69866090578088"/> 
<Vertex lon="-75.86943172024455" lat="84.82932444649522"/> 
<Vertex lon="-120.2348644025080" lat="79.20545501221262"/> 
<Vertex lon="-131.7764604185893" lat="74.23892440366959"/> 
<Vertex lon="-129.5517002991992" lat="70.82723864289754"/> 
<Vertex lon="-135.0787114475045" lat="70.38558250059234"/> 
<Vertex lon="-140.2535393652618" lat="70.28769269360542"/> 
<Vertex lon="-145.4535008532789" lat="70.69512624893864"/> 
<Vertex lon="-151.3973062432938" lat="71.25684228307175"/> 
<Vertex lon="-156.6807094307236" lat="71.59025543367548"/> 
<Vertex lon="-163.0192773990730" lat="70.52688455140388"/> 
<Vertex lon="-167.3682278149874" lat="69.26078570607743"/> 
<Vertex lon="-167.8123091778309" lat="67.02887137730350"/> 
<Vertex lon="-155.2914908493373" lat="68.15237995260851"/> 

	</Polygon>

Edited 14 hours ago14 hr by lgcharlot
Added note that airport test radius does not have to be revised to use huge vegetation exclusion polygons.