public async override Task <TextureTile> GetTexture(TileId tileId, CancellationToken cancellationToken = default)
{
// This tile service works in TilePositions (X, Y, ZOOM), not TileIds, so we need to convert.
var tilePosition = tileId.ToTilePosition();
var zoom = tilePosition.LevelOfDetail.Value;
// Also, the service has four DNS aliases which can help distribute request load. Because this is a quad-tree
// tile system where each tile has three siblings, i.e. a tile has four children, then we can use the tile's ID
// in relation to it's parent (is it child 0, 1, 2, or 3?) to determine which subdomain alias to use.
var subdomain = tileId.GetSubdomain();
var subdomainId = subdomain == 0 ? "" : subdomain.ToString();
// Construct the URL.
var uri = $@"http://mesonet{subdomainId}.agron.iastate.edu/cache/tile.py/1.0.0/nexrad-n0q-900913/{zoom}/{tilePosition.X}/{tilePosition.Y}.jpg";
// Retrieve the bytes for this tile (it's a JPEG).
var response = await _httpClient.GetAsync(uri).ConfigureAwait(false);
var result = await response.Content.ReadAsByteArrayAsync().ConfigureAwait(false);
// Create a TextureTile.
return(TextureTile.FromImageData(result));
}