My airport isn't completely covered in ice


I've been using the ADE for a while now, mostly to update the airports in FSX to how they look like nowadays. I've done the CDG airport, and I wanted to make an winter version of the airport. I didn't see a snow texture when selecting landclass while I was making an polygon, so I saw that I would be satisfied enough if I used ice. However, when I tried this in the airport, there were only the half part covered in ice, the rest was just grass. I've tried both ice and glacier ice, but no difference. I hope for an solution.