Generate measurements

create_measurements.ps1

param(
    [int]$numRecords
)
$filename = "measurements.txt"

if ($numRecords -eq $null) {
    Write-Host "Usage: create_measurements.ps1 <number of records to create>"
    exit 1
}

$random = [System.Random]::new();
function Get-GaussianRandomNumber {
    param (
        [double]$mean,
        [double]$stdDev
    )

    $u1 = $random.NextDouble()
    $u2 = $random.NextDouble()
    $randStdNormal = [math]::Sqrt(-2.0 * [math]::Log($u1)) * [math]::Sin((2.0 * [math]::PI) * $u2)
    $randNormal = $mean + $stdDev * $randStdNormal
    return $randNormal
}

$stations = @(
    @{id="Abha"; meanTemperature=18.0},
    @{id="Abidjan"; meanTemperature=26.0},
    @{id="Abéché"; meanTemperature=29.4},
    @{id="Accra"; meanTemperature=26.4},
    @{id="Addis Ababa"; meanTemperature=16.0},
    @{id="Adelaide"; meanTemperature=17.3},
    @{id="Aden"; meanTemperature=29.1},
    @{id="Ahvaz"; meanTemperature=25.4},
    @{id="Albuquerque"; meanTemperature=14.0},
    @{id="Alexandra"; meanTemperature=11.0},
    @{id="Alexandria"; meanTemperature=20.0},
    @{id="Algiers"; meanTemperature=18.2},
    @{id="Alice Springs"; meanTemperature=21.0},
    @{id="Almaty"; meanTemperature=10.0},
    @{id="Amsterdam"; meanTemperature=10.2},
    @{id="Anadyr"; meanTemperature=-6.9},
    @{id="Anchorage"; meanTemperature=2.8},
    @{id="Andorra la Vella"; meanTemperature=9.8},
    @{id="Ankara"; meanTemperature=12.0},
    @{id="Antananarivo"; meanTemperature=17.9},
    @{id="Antsiranana"; meanTemperature=25.2},
    @{id="Arkhangelsk"; meanTemperature=1.3},
    @{id="Ashgabat"; meanTemperature=17.1},
    @{id="Asmara"; meanTemperature=15.6},
    @{id="Assab"; meanTemperature=30.5},
    @{id="Astana"; meanTemperature=3.5},
    @{id="Athens"; meanTemperature=19.2},
    @{id="Atlanta"; meanTemperature=17.0},
    @{id="Auckland"; meanTemperature=15.2},
    @{id="Austin"; meanTemperature=20.7},
    @{id="Baghdad"; meanTemperature=22.77},
    @{id="Baguio"; meanTemperature=19.5},
    @{id="Baku"; meanTemperature=15.1},
    @{id="Baltimore"; meanTemperature=13.1},
    @{id="Bamako"; meanTemperature=27.8},
    @{id="Bangkok"; meanTemperature=28.6},
    @{id="Bangui"; meanTemperature=26.0},
    @{id="Banjul"; meanTemperature=26.0},
    @{id="Barcelona"; meanTemperature=18.2},
    @{id="Bata"; meanTemperature=25.1},
    @{id="Batumi"; meanTemperature=14.0},
    @{id="Beijing"; meanTemperature=12.9},
    @{id="Beirut"; meanTemperature=20.9},
    @{id="Belgrade"; meanTemperature=12.5},
    @{id="Belize City"; meanTemperature=26.7},
    @{id="Benghazi"; meanTemperature=19.9},
    @{id="Bergen"; meanTemperature=7.7},
    @{id="Berlin"; meanTemperature=10.3},
    @{id="Bilbao"; meanTemperature=14.7},
    @{id="Birao"; meanTemperature=26.5},
    @{id="Bishkek"; meanTemperature=11.3},
    @{id="Bissau"; meanTemperature=27.0},
    @{id="Blantyre"; meanTemperature=22.2},
    @{id="Bloemfontein"; meanTemperature=15.6},
    @{id="Boise"; meanTemperature=11.4},
    @{id="Bordeaux"; meanTemperature=14.2},
    @{id="Bosaso"; meanTemperature=30.0},
    @{id="Boston"; meanTemperature=10.9},
    @{id="Bouaké"; meanTemperature=26.0},
    @{id="Bratislava"; meanTemperature=10.5},
    @{id="Brazzaville"; meanTemperature=25.0},
    @{id="Bridgetown"; meanTemperature=27.0},
    @{id="Brisbane"; meanTemperature=21.4},
    @{id="Brussels"; meanTemperature=10.5},
    @{id="Bucharest"; meanTemperature=10.8},
    @{id="Budapest"; meanTemperature=11.3},
    @{id="Bujumbura"; meanTemperature=23.8},
    @{id="Bulawayo"; meanTemperature=18.9},
    @{id="Burnie"; meanTemperature=13.1},
    @{id="Busan"; meanTemperature=15.0},
    @{id="Cabo San Lucas"; meanTemperature=23.9},
    @{id="Cairns"; meanTemperature=25.0},
    @{id="Cairo"; meanTemperature=21.4},
    @{id="Calgary"; meanTemperature=4.4},
    @{id="Canberra"; meanTemperature=13.1},
    @{id="Cape Town"; meanTemperature=16.2},
    @{id="Changsha"; meanTemperature=17.4},
    @{id="Charlotte"; meanTemperature=16.1},
    @{id="Chiang Mai"; meanTemperature=25.8},
    @{id="Chicago"; meanTemperature=9.8},
    @{id="Chihuahua"; meanTemperature=18.6},
    @{id="Chișinău"; meanTemperature=10.2},
    @{id="Chittagong"; meanTemperature=25.9},
    @{id="Chongqing"; meanTemperature=18.6},
    @{id="Christchurch"; meanTemperature=12.2},
    @{id="City of San Marino"; meanTemperature=11.8},
    @{id="Colombo"; meanTemperature=27.4},
    @{id="Columbus"; meanTemperature=11.7},
    @{id="Conakry"; meanTemperature=26.4},
    @{id="Copenhagen"; meanTemperature=9.1},
    @{id="Cotonou"; meanTemperature=27.2},
    @{id="Cracow"; meanTemperature=9.3},
    @{id="Da Lat"; meanTemperature=17.9},
    @{id="Da Nang"; meanTemperature=25.8},
    @{id="Dakar"; meanTemperature=24.0},
    @{id="Dallas"; meanTemperature=19.0},
    @{id="Damascus"; meanTemperature=17.0},
    @{id="Dampier"; meanTemperature=26.4},
    @{id="Dar es Salaam"; meanTemperature=25.8},
    @{id="Darwin"; meanTemperature=27.6},
    @{id="Denpasar"; meanTemperature=23.7},
    @{id="Denver"; meanTemperature=10.4},
    @{id="Detroit"; meanTemperature=10.0},
    @{id="Dhaka"; meanTemperature=25.9},
    @{id="Dikson"; meanTemperature=-11.1},
    @{id="Dili"; meanTemperature=26.6},
    @{id="Djibouti"; meanTemperature=29.9},
    @{id="Dodoma"; meanTemperature=22.7},
    @{id="Dolisie"; meanTemperature=24.0},
    @{id="Douala"; meanTemperature=26.7},
    @{id="Dubai"; meanTemperature=26.9},
    @{id="Dublin"; meanTemperature=9.8},
    @{id="Dunedin"; meanTemperature=11.1},
    @{id="Durban"; meanTemperature=20.6},
    @{id="Dushanbe"; meanTemperature=14.7},
    @{id="Edinburgh"; meanTemperature=9.3},
    @{id="Edmonton"; meanTemperature=4.2},
    @{id="El Paso"; meanTemperature=18.1},
    @{id="Entebbe"; meanTemperature=21.0},
    @{id="Erbil"; meanTemperature=20.0},
    @{id="Esperance"; meanTemperature=16.5},
    @{id="Fairbanks"; meanTemperature=-3.2},
    @{id="Faisalabad"; meanTemperature=24.0},
    @{id="Fortaleza"; meanTemperature=26.8},
    @{id="Fort Worth"; meanTemperature=19.3},
    @{id="Freeport"; meanTemperature=24.3},
    @{id="Freetown"; meanTemperature=27.0},
    @{id="Fukuoka"; meanTemperature=17.0},
    @{id="Funafuti"; meanTemperature=29.2},
    @{id="Gabala"; meanTemperature=11.4},
    @{id="Galapagos"; meanTemperature=24.7},
    @{id="Galle"; meanTemperature=26.7},
    @{id="Gander"; meanTemperature=3.9},
    @{id="Gao"; meanTemperature=29.4},
    @{id="Garoua"; meanTemperature=27.5},
    @{id="Geelong"; meanTemperature=14.5},
    @{id="Georgetown"; meanTemperature=26.4},
    @{id="Gibraltar"; meanTemperature=18.6},
    @{id="Gitega"; meanTemperature=19.5},
    @{id="Giza"; meanTemperature=20.8},
    @{id="Guadalajara"; meanTemperature=20.5},
    @{id="Guangzhou"; meanTemperature=22.6},
    @{id="Guatemala City"; meanTemperature=18.1},
    @{id="Guayaquil"; meanTemperature=25.5},
    @{id="Gustavo Díaz Ordaz"; meanTemperature=24.0},
    @{id="Hamburg"; meanTemperature=9.4},
    @{id="Hamilton"; meanTemperature=15.6},
    @{id="Hanoi"; meanTemperature=23.6},
    @{id="Harare"; meanTemperature=17.9},
    @{id="Harbin"; meanTemperature=3.6},
    @{id="Hargeisa"; meanTemperature=18.4},
    @{id="Havana"; meanTemperature=25.5},
    @{id="Helsinki"; meanTemperature=5.9},
    @{id="Ho Chi Minh City"; meanTemperature=27.1},
    @{id="Hobart"; meanTemperature=13.0},
    @{id="Hong Kong"; meanTemperature=23.4},
    @{id="Honolulu"; meanTemperature=25.2},
    @{id="Houston"; meanTemperature=20.8},
    @{id="Hué"; meanTemperature=25.1},
    @{id="Hyderabad"; meanTemperature=26.0},
    @{id="Ilulissat"; meanTemperature=-3.2},
    @{id="Indianapolis"; meanTemperature=11.8},
    @{id="Innsbruck"; meanTemperature=9.4},
    @{id="Invercargill"; meanTemperature=9.9},
    @{id="Ipoh"; meanTemperature=27.0},
    @{id="Iqaluit"; meanTemperature=-9.8},
    @{id="Iquique"; meanTemperature=17.0},
    @{id="Irkutsk"; meanTemperature=1.1},
    @{id="Islamabad"; meanTemperature=21.3},
    @{id="Istanbul"; meanTemperature=14.3},
    @{id="Izmir"; meanTemperature=17.4},
    @{id="Jackson"; meanTemperature=18.5},
    @{id="Jacksonville"; meanTemperature=20.4},
    @{id="Jakarta"; meanTemperature=27.6},
    @{id="Jammu"; meanTemperature=24.5},
    @{id="Jinan"; meanTemperature=14.2},
    @{id="Johannesburg"; meanTemperature=16.0},
    @{id="Juba"; meanTemperature=27.1},
    @{id="Juneau"; meanTemperature=3.9},
    @{id="Kabul"; meanTemperature=12.1},
    @{id="Kaduna"; meanTemperature=25.0},
    @{id="Kagoshima"; meanTemperature=18.0},
    @{id="Kahului"; meanTemperature=24.2},
    @{id="Kaohsiung"; meanTemperature=25.0},
    @{id="Karachi"; meanTemperature=26.7},
    @{id="Kathmandu"; meanTemperature=18.2},
    @{id="Khartoum"; meanTemperature=29.6},
    @{id="Kiev"; meanTemperature=8.4},
    @{id="Kigali"; meanTemperature=20.6},
    @{id="Kingston"; meanTemperature=26.9},
    @{id="Kinshasa"; meanTemperature=26.4},
    @{id="Kolkata"; meanTemperature=26.9},
    @{id="Koror"; meanTemperature=28.0},
    @{id="Kos"; meanTemperature=18.7},
    @{id="Kuala Lumpur"; meanTemperature=27.4},
    @{id="Kuching"; meanTemperature=27.2},
    @{id="Kuwait City"; meanTemperature=26.6},
    @{id="Kyoto"; meanTemperature=15.9},
    @{id="Lagos"; meanTemperature=27.0},
    @{id="La Paz"; meanTemperature=10.4},
    @{id="Las Palmas"; meanTemperature=21.3},
    @{id="Las Vegas"; meanTemperature=19.8},
    @{id="Launceston"; meanTemperature=12.5},
    @{id="Libreville"; meanTemperature=26.0},
    @{id="Lilongwe"; meanTemperature=19.3},
    @{id="Lima"; meanTemperature=19.2},
    @{id="Limerick"; meanTemperature=9.9},
    @{id="Linz"; meanTemperature=9.6},
    @{id="Lisbon"; meanTemperature=17.5},
    @{id="Ljubljana"; meanTemperature=9.8},
    @{id="Lomé"; meanTemperature=27.0},
    @{id="London"; meanTemperature=11.1},
    @{id="Los Angeles"; meanTemperature=18.3},
    @{id="Luanda"; meanTemperature=24.2},
    @{id="Lubumbashi"; meanTemperature=20.8},
    @{id="Lucknow"; meanTemperature=25.7},
    @{id="Lusaka"; meanTemperature=20.2},
    @{id="Luxembourg"; meanTemperature=9.1},
    @{id="Macao"; meanTemperature=22.8},
    @{id="Mackay"; meanTemperature=23.6},
    @{id="Madrid"; meanTemperature=14.3},
    @{id="Majuro"; meanTemperature=27.6},
    @{id="Malabo"; meanTemperature=25.9},
    @{id="Malang"; meanTemperature=22.2},
    @{id="Malé"; meanTemperature=28.0},
    @{id="Malindi"; meanTemperature=25.9},
    @{id="Malta"; meanTemperature=19.3},
    @{id="Manaus"; meanTemperature=26.6},
    @{id="Manila"; meanTemperature=27.2},
    @{id="Maputo"; meanTemperature=22.2},
    @{id="Maseru"; meanTemperature=14.8},
    @{id="Matadi"; meanTemperature=25.6},
    @{id="Matsumoto"; meanTemperature=11.8},
    @{id="Mazatlán"; meanTemperature=25.0},
    @{id="Mbabane"; meanTemperature=16.3},
    @{id="Mecca"; meanTemperature=30.8},
    @{id="Medan"; meanTemperature=26.2},
    @{id="Medellín"; meanTemperature=22.0},
    @{id="Melbourne"; meanTemperature=15.2},
    @{id="Memphis"; meanTemperature=17.0},
    @{id="Mexico City"; meanTemperature=15.9},
    @{id="Miami"; meanTemperature=23.9},
    @{id="Minsk"; meanTemperature=6.4},
    @{id="Mogadishu"; meanTemperature=27.1},
    @{id="Monaco"; meanTemperature=16.0},
    @{id="Monrovia"; meanTemperature=25.7},
    @{id="Montevideo"; meanTemperature=16.6},
    @{id="Montreal"; meanTemperature=6.4},
    @{id="Moroni"; meanTemperature=24.9},
    @{id="Moscow"; meanTemperature=5.4},
    @{id="Multan"; meanTemperature=25.9},
    @{id="Mumbai"; meanTemperature=26.7},
    @{id="Munich"; meanTemperature=7.7},
    @{id="Muscat"; meanTemperature=27.6},
    @{id="Nairobi"; meanTemperature=19.2},
    @{id="Nanjing"; meanTemperature=15.5},
    @{id="Naples"; meanTemperature=17.2},
    @{id="Nassau"; meanTemperature=24.5},
    @{id="Naypyidaw"; meanTemperature=27.0},
    @{id="Ndjamena"; meanTemperature=27.6},
    @{id="New Delhi"; meanTemperature=25.3},
    @{id="New Orleans"; meanTemperature=20.6},
    @{id="New York"; meanTemperature=13.8},
    @{id="Niamey"; meanTemperature=29.0},
    @{id="Nice"; meanTemperature=16.3},
    @{id="Nicosia"; meanTemperature=20.1},
    @{id="Niigata"; meanTemperature=12.3},
    @{id="Nouakchott"; meanTemperature=24.4},
    @{id="Noumea"; meanTemperature=23.0},
    @{id="Nukualofa"; meanTemperature=23.5},
    @{id="Nuremberg"; meanTemperature=8.8},
    @{id="Nuuk"; meanTemperature=-1.2},
    @{id="Oaxaca"; meanTemperature=20.5},
    @{id="Odessa"; meanTemperature=11.5},
    @{id="Osaka"; meanTemperature=16.6},
    @{id="Oslo"; meanTemperature=6.7},
    @{id="Ottawa"; meanTemperature=5.8},
    @{id="Ouagadougou"; meanTemperature=28.1},
    @{id="Padang"; meanTemperature=26.4},
    @{id="Pago Pago"; meanTemperature=27.0},
    @{id="Palembang"; meanTemperature=26.9},
    @{id="Panama City"; meanTemperature=27.0},
    @{id="Paramaribo"; meanTemperature=27.1},
    @{id="Paris"; meanTemperature=11.7},
    @{id="Patna"; meanTemperature=25.7},
    @{id="Pekanbaru"; meanTemperature=27.0},
    @{id="Peshawar"; meanTemperature=22.0},
    @{id="Philadelphia"; meanTemperature=13.0},
    @{id="Phnom Penh"; meanTemperature=28.0},
    @{id="Phuket"; meanTemperature=28.0},
    @{id="Phu Quoc"; meanTemperature=27.5},
    @{id="Podgorica"; meanTemperature=13.3},
    @{id="Port Moresby"; meanTemperature=27.1},
    @{id="Port Louis"; meanTemperature=23.4},
    @{id="Port Vila"; meanTemperature=23.8},
    @{id="Prague"; meanTemperature=9.1},
    @{id="Praia"; meanTemperature=24.1},
    @{id="Pretoria"; meanTemperature=18.0},
    @{id="Puebla"; meanTemperature=16.0},
    @{id="Pune"; meanTemperature=24.0},
    @{id="Pyongyang"; meanTemperature=10.2},
    @{id="Quebec"; meanTemperature=3.8},
    @{id="Quito"; meanTemperature=13.3},
    @{id="Rabat"; meanTemperature=17.8},
    @{id="Rawalpindi"; meanTemperature=21.3},
    @{id="Recife"; meanTemperature=25.5},
    @{id="Reykjavik"; meanTemperature=4.2},
    @{id="Riga"; meanTemperature=6.8},
    @{id="Riyadh"; meanTemperature=25.6},
    @{id="Rome"; meanTemperature=15.7},
    @{id="Saipan"; meanTemperature=28.0},
    @{id="Salvador"; meanTemperature=25.1},
    @{id="Salzburg"; meanTemperature=9.3},
    @{id="Samoa"; meanTemperature=27.0},
    @{id="San Antonio"; meanTemperature=20.5},
    @{id="San Diego"; meanTemperature=17.6},
    @{id="San Francisco"; meanTemperature=13.6},
    @{id="San José"; meanTemperature=21.4},
    @{id="San Juan"; meanTemperature=26.7},
    @{id="San Salvador"; meanTemperature=24.0},
    @{id="Santa Cruz"; meanTemperature=23.4},
    @{id="Santa Marta"; meanTemperature=27.0},
    @{id="Santorini"; meanTemperature=17.1},
    @{id="Sao Paulo"; meanTemperature=19.0},
    @{id="Sapporo"; meanTemperature=8.6},
    @{id="Sarajevo"; meanTemperature=10.2},
    @{id="Seattle"; meanTemperature=11.6},
    @{id="Seoul"; meanTemperature=11.9},
    @{id="Shanghai"; meanTemperature=16.0},
    @{id="Singapore"; meanTemperature=27.0},
    @{id="Sofia"; meanTemperature=10.8},
    @{id="South Tarawa"; meanTemperature=28.2},
    @{id="Stockholm"; meanTemperature=7.1},
    @{id="Sucre"; meanTemperature=13.0},
    @{id="Surabaya"; meanTemperature=26.9},
    @{id="Surat"; meanTemperature=26.7},
    @{id="Suva"; meanTemperature=25.5},
    @{id="Sydney"; meanTemperature=18.0},
    @{id="Tabriz"; meanTemperature=11.0},
    @{id="Taichung"; meanTemperature=23.0},
    @{id="Taipei"; meanTemperature=23.0},
    @{id="Tallinn"; meanTemperature=6.6},
    @{id="Tashkent"; meanTemperature=14.4},
    @{id="Tbilisi"; meanTemperature=13.4},
    @{id="Tegucigalpa"; meanTemperature=22.0},
    @{id="Tehran"; meanTemperature=17.0},
    @{id="Thessaloniki"; meanTemperature=15.3},
    @{id="Thimphu"; meanTemperature=12.7},
    @{id="Tianjin"; meanTemperature=14.0},
    @{id="Tijuana"; meanTemperature=17.0},
    @{id="Tirana"; meanTemperature=15.6},
    @{id="Tokyo"; meanTemperature=16.4},
    @{id="Toronto"; meanTemperature=8.4},
    @{id="Tórshavn"; meanTemperature=6.5},
    @{id="Tripoli"; meanTemperature=20.3},
    @{id="Tunis"; meanTemperature=18.3},
    @{id="Ulaanbaatar"; meanTemperature=-0.4},
    @{id="Vaduz"; meanTemperature=9.7},
    @{id="Valletta"; meanTemperature=19.3},
    @{id="Vancouver"; meanTemperature=10.0},
    @{id="Victoria"; meanTemperature=27.0},
    @{id="Vienna"; meanTemperature=9.4},
    @{id="Vientiane"; meanTemperature=25.5},
    @{id="Vilnius"; meanTemperature=7.0},
    @{id="Warsaw"; meanTemperature=7.7},
    @{id="Washington"; meanTemperature=13.5},
    @{id="Wellington"; meanTemperature=13.3},
    @{id="West Island"; meanTemperature=27.0},
    @{id="Windhoek"; meanTemperature=20.5},
    @{id="Winnipeg"; meanTemperature=2.6},
    @{id="Warsaw"; meanTemperature=8.2},
    @{id="Wuhan"; meanTemperature=17.0},
    @{id="Wuxi"; meanTemperature=16.0},
    @{id="Xiamen"; meanTemperature=20.0},
    @{id="Yangon"; meanTemperature=27.5},
    @{id="Yaoundé"; meanTemperature=23.5},
    @{id="Yerevan"; meanTemperature=11.6},
    @{id="Yokohama"; meanTemperature=15.9},
    @{id="Zagreb"; meanTemperature=11.1},
    @{id="Zanzibar"; meanTemperature=26.8},
    @{id="Zurich"; meanTemperature=8.5}
);
$startTime = Get-Date
$fileStream = $null
$streamWriter = $null
try {
    [int]$stationCount = $stations.Count;
    $path = Join-Path (Resolve-Path  ".") $filename
    $fileStream = [System.IO.File]::Open($path, [System.IO.FileMode]::Create, [System.IO.FileAccess]::Write, [System.IO.FileShare]::None)
    $streamWriter = [System.IO.StreamWriter]::new($fileStream, [System.Text.Encoding]::Default, 4096)
    
    for ($i = 0; $i -lt $numRecords; $i++) {
        $station = $stations[$i % $stationCount]
        $stationId = $station.id
        $stationTemp = [math]::Round((Get-GaussianRandomNumber -mean $station.meanTemperature -stdDev 10.0), 1)
    
        [void]$streamWriter.WriteLine("$stationId;$stationTemp")

        if ($i % 100000 -eq 0) {
            Write-Output "$([math]::Round($i / $numRecords * 100, 2))% complete"
        }
    }
}
finally {
    if ($null -ne $streamWriter) {
        $streamWriter.Close()
    } 
    if ($null -ne $fileStream) {
        $fileStream.Close()
    }
}

$endTime = Get-Date
$duration = $endTime - $startTime
Write-Output "Start Time: $startTime"
Write-Output "End Time: $endTime"
Write-Output "Duration: $duration"