polling-station-map/polygons.ps1

$searchResults = Get-Content ./input | Sort-Object {Get-Random} | ForEach-Object -ThrottleLimit 3 -Parallel {
    (Invoke-RestMethod ('https://nominatim.openstreetmap.org/search?format=jsonv2&limit=1&q='+$_))[0]
}

$coordinateList = $searchResults
| ForEach-Object {
    ,@([Decimal]$_.lon,[Decimal]$_.lat)
}
| Sort-Object {$_[0][0]}

$output = [PSCustomObject]@{
    type = 'FeatureCollection'
    features = @(
        [PSCustomObject]@{
            type = 'Feature'
            properties = [PSCustomObject]@{
                _umap_options = [PSCustomObject]@{
                    color = 'LimeGreen'
                }
                name = 'turnhalle'
            }
            geometry = [PSCustomObject]@{
                type = 'Polygon'
                coordinates = ,$coordinateList
            }
        }
    )
}

$output | ConvertTo-Json -Depth 99 | Out-File output.geojson