Or https://www.thethingsnetwork.org/gateway-data/country/nz (and more URLs in Determine which gateway is used by a given node).
Of course, you cannot be sure people know about Gateway Altitude parameter - value and purpose. But using curl and jq one can fetch all New Zealand gateways, sort by altitude, and select some details:
curl https://www.thethingsnetwork.org/gateway-data/country/nz | jq -r '
[.[]] | sort_by(.location.altitude) | reverse | .[] |
[
.location.altitude//"-",
.id,
if .owner then
"[\(.owner)](https://thethingsnetwork.org/u/\(.owner))"
else
"unknown"
end,
if .location.latitude then
"[\(.location.latitude), \(.location.longitude)](https://www.google.com/maps/search/\(.location.latitude),\(.location.longitude))"
else
"unknown"
end,
.description
] |
join(" | ")
'
Now, it seems “the winner” is not a real gateway, but a single-channel forwarder. 
These should really not be used in the shared TTN community network, and even less so on a position that high, which might make it receive uplinks from many nodes that (rightfully so) expect a fully compliant gateway.
And the winner is...
| altitude | id | owner | location | description |
|---|---|---|---|---|
| 1270 | eui-d8a01dffff435854 | greensladenz | -44.77768132, 170.32570646 | SingleChan-ESP32 |
| 702 | eui-3235313229006100 | netguy | -43.200462, 171.444174 | NUVOLA.NZ GW1014-Harper |
| 670 | eui-3235313253003700 | unknown | -41.80625, 172.83875 | ElectricMagnetic (4VCJ5RVQ+) |
| 656 | eui-3235313226006d00 | netguy | -43.423907, 171.762368 | NUVOLA.NZ GW1012 Bushy Stream |
| 630 | eui-3235313226005900 | netguy | -43.496972, 171.686705 | NUVOLA.NZ GW1011 Rakaia Gorge |
| 600 | nz-wairarapa-masterton-01 | jlynch | -40.848946, 175.735567 | Rangitumau Gateway |
| 593 | eui-3235313228002800 | icepicknz | -39.42236393, 175.40389674 | Barry AT Devoli - nzohk-01-snowmass- AU915 |
| 566 | b827ebfffe389699 | jlynch | -41.163211822509766, 175.65725708007812 | NZ-Wairarapa-Masterton Eringa Teletronics (Port 38553) |
| 442 | eui-a840411b7e404150 | netguy | -43.58469406, 172.72521175 | NUVOLA.NZ-GW1005 Mount Pleasant |
| 428 | b827ebfffe28b58a | jlynch | -40.88363265991211, 175.98118591308594 | NZ-Wairarapa-Masterton Bute Teletronics (Port 46474) |
| 327 | eui-b827ebfffee2af08 | opiot | -45.77653027, 170.60519317 | Poly_Orokonui |
| 319 | eui-a840411d19284150 | netguy | -42.928023, 172.668449 | NUVOLA.NZ - 262219 Hawarden |
| 310 | eui-3235313264003900 | wheronet | -37.38, 174.78 | Daff - Gateway deployed by WheroNet (AU915-928) |
| 300 | wheronet_293e4f | wheronet | -37.35, 174.85 | Klondyke - Gateway deployed by WheroNet (AU915-928) |
| 273 | eui-3235313249007100 | netguy | -43.65850254, 172.63723395 | NUVOLA.NZ GW1010 Teddington |
| 250 | ttng1 | unknown | -36.8507194519043, 174.85763549804688 | |
| 250 | eui-00800000a0001a7c | wheronet | -37.34, 174.91 | Kauri - Gateway deployed by WheroNet (AU915-928) |
| 245 | eui-00800000a0000a3a | wheronet | -37.5, 174.87 | Waikaretu - Gateway deployed by WheroNet (AU915-928) |
| 237 | eui-3235313267004400 | netguy | -43.625234, 172.587817 | NUVOLA.NZ GW1013 Lansdowne |
| 230 | wheronet_2942bd | wheronet | -37.4, 174.85 | Ponganui - Gateway deployed by WheroNet (AU915-928) |
| 210 | eui-3235313226005800 | wheronet | -37.31, 174.91 | Kaipo - Gateway deployed by WheroNet (AU915-928) |
| 197 | eui-a840411b6b844150 | netguy | -43.58005949, 172.64072455 | NUVOLA.NZ-GW1002 Cashmere |
| 150 | eui-b827ebfffeee4f4e | 600andrew | -43.20815544, 172.51976327 | North Loburn - Raspberry Pi3 |
| 133 | happybirdsnz001 | happybirdsnz | -43.316456, 172.364173 | HappybirdsNZ- 001 |
| 131 | eui-3235313235001e00 | wheronet | -37.34, 174.96 | Hunt - Gateway deployed by WheroNet (AU915-928) |
| 125 | eui-b827ebfffea99bc5 | opiot | -45.91404171, 170.47811731 | Poly_RAK3 |
| 125 | eui-3235313228005e00 | wheronet | -37.39, 174.98 | Fleming - Gateway deployed by WheroNet (AU915-928) |
| 115 | eui-343632384a002500 | wheronet | -37.37, 174.9 | Lower Ponganui - Gateway deployed by WheroNet (AU915-928) |
| 100 | eui-b827ebfffefb0316 | opiot | -45.8827256, 170.47782094 | Poly_RAK1 |
| 100 | eui-b827ebfffe2b6342 | opiot | -45.86883041, 170.4724168 | Poly_RAK6 |
| 100 | ab-home | akshatuoa | -36.71143142, 174.67606116 | At AB Home |
| 99 | salemfarms2 | andyg | -35.58182618, 174.21654818 | Raspberry Pi rhf0m301 |
| 90 | eui-b827ebfffee1f35c | techoneer | -36.9020957, 174.76744332 | Techoneer development gateway |
| 84 | eui-60c5a8fffe74d671 | sassinak | -37.72801993, 175.22239515 | RAK7249 Outdoor Gateway |
| 70 | eui-323531321c003a00 | nelspecs | -41.313765, 173.319928 | Nelspecs Fringed Hill AU915 |
| 70 | crayola | g1234 | -43.66359083, 172.5848539 | India frequency plan - https://www.thethingsnetwork.org/docs/lorawan/frequency-plans.html |
| 65 | eui-a840411bcd8c4150 | netguy | -43.60605348, 172.72597496 | NUVOLA.NZ-GW1006 Lyttelton |
| 56 | kohimarama | smbunn | -36.85405449, 174.83877417 | Simon’s Gateway in Kohimarama Auckland, (916.8-927.5MHz) |
| 45 | eui-b827ebfffe11144e | dgashby | -43.385521, 172.524994 | Mandeville TTN Gateway |
| 45 | eui-a840411bab9c4150 | altissimo_michael | -43.56495417, 172.65139202 | altissimo_south |
| 45 | eui-24e124fffef0718d | icepicknz | -37.75050313, 176.15605667 | Barry AT Devoli - nztga-01-dayna - AU915 |
| 41 | eui-b827ebfffefaafec | wayneji | -41.17208767, 174.8214265 | RAK831 - Tawa, Wellington, New Zealand |
| 30 | eui-00800000a0000c7f | opiot | -45.86579843, 170.51942104 | Poly_Rooftop |
| 20 | eui-dca632ffff022a20 | unknown | -43.574188232421875, 172.61383056640625 | |
| 18 | eui-b827ebfffe3cb35e | unknown | -45.90653562, 170.30181506 | Allanton Gateway 2 |
| 15 | eui-b827ebfffe03be33 | opiot | -45.86576213, 170.51949524 | Poly_RAK2 |
| 10 | eui-b827ebfffe2bf907 | carbon6 | -43.56233869, 172.67104628 | carbon6_gateway_201801 |
| 10 | eui-b827ebfffe078319 | alanp | -43.55195725, 172.65663905 | Page-tek |
| 10 | eui-3235313228006600 | markuz | -43.66176478, 172.55041513 | Tai Tapu NZ |
| 8 | eui-b827ebfffe541724 | sassinak | -37.80458829, 174.88492329 | RAK831 RPi |
| 7 | eui-a840411bcd3c4150 | netguy | -43.717179, 172.440134 | NUVOLA.NZ-GW1004 Selwyn Huts |
| 6 | eui-dca632fffe0e8d81 | optimho | -38.14455371, 176.23515981 | Rutland Gateway |
| 6 | eui-b827ebfffe049939 | getunified | -36.66018799, 174.56041901 | Getunified Gateway #1 |
| 5 | jmansloragateway | unknown | -43.47686516, 172.68560803 | Jman’s Lora Gateway |
| 5 | eui-a840411d19f04289 | bettersense-sam | -36.8948823, 174.7428274 | bettersense-lps8-01-akl |
| 5 | eui-60c5a8fffe761392 | unknown | -37.97185781, 177.06066388 | RAKWireless 7258 |
| 5 | eui-58a0cbfffe8018a3 | wheronet | -37.333, 174.906 | Internal 1 - Gateway deployed by WheroNet (AU915-928) |
| 1 | eui-4c11aeffffc85d28 | unknown | -36.584991455078125, 174.6999969482422 | |
| 0 | ttngwnz01 | unknown | -36.86303528, 174.8564322 | TTNGW1 Dev Gateway_Auckland_NZ |
| 0 | ttngwnz001 | unknown | -36.85934066772461, 174.8603515625 | |
| 0 | timarudc-gateway-02 | timarudc | -44.3856141, 171.24287664 | Timaru District Council Gateway - Maori Hill |
| 0 | think3-office-au915 | unknown | -39.92928695678711, 175.0464324951172 | |
| 0 | ioa-palmy-gateway | tairea | -40.35947606, 175.65798201 | IoA Gateway |
| 0 | eui-dca632fffe0ca741 | donnacha | -37.9700499, 177.05189462 | Ohope beach |
| 0 | eui-d8a01dffff60b080 | churbro | -37.66346516, 176.13943406 | ttgo3 |
| 0 | eui-c0ee40ffff293887 | xu7wong | -36.8833169, 174.86868312 | rg119 |
| 0 | eui-b827ebfffec0d186 | icepicknz | -38.39157643, 176.03564904 | Barry AT Devoli - nzati-01-tia - AU915 |
| 0 | eui-b827ebfffeb4fc5f | delphinus | -45.91335908, 170.46587327 | rak |
| 0 | eui-b827ebfffe830a45 | andyg | -35.58271097, 174.21531311 | RPi with RAK2245 concentrator |
| 0 | eui-a840411d19404150 | rob_w_altissimo | -43.51949728, 172.63871161 | altissimo_central |
| 0 | eui-a840411d18fc4150 | andkiw | -43.558101654052734, 172.59779357910156 | Dragino Gateway |
| 0 | eui-a840411d078c4150 | acutetech | -34.97295108, 173.53839198 | LG01-N for Acutetech development only. |
| 0 | eui-a840411cfe484150 | mattway | -36.8952746, 174.7015856 | Econode2 |
| 0 | eui-a840411c0b24ffff | kandarp | -36.87057158, 174.76247308 | Auckland |
| 0 | eui-a840411bb1dc4150 | groundednz | -43.51285264, 171.84409431 | Grounded Office |
| 0 | eui-a840411bace04150 | busyman | -43.2142776, 172.48213056 | North Loburn, New Zealand Coombes gateway |
| 0 | eui-a84041180c89ffff | bikki | -41.244327545166016, 174.79830932617188 | BBs Gateway |
| 0 | eui-a8404117ff22ffff | brunonz | -37.0470907, 174.93366591 | Takanini B |
| 0 | eui-647fdafffe00a72f | adroitnz | -36.86069124, 174.74854461 | Adroit Test Gateway |
| 0 | eui-60c5a8fffe76648a | unknown | -41.20078795, 174.89591458 | RAK7258 Gateway |
| 0 | eui-60c5a8fffe766143 | unknown | -41.30425569, 174.83148222 | karaka_bay |
| 0 | eui-60c5a8fffe760e46 | sammunshi | -36.88212161, 174.7624635 | IoTV HQ - RAK Micro |
| 0 | eui-60c5a8fffe74d397 | explorertechnz | -36.85209811, 174.84085609 | GW_007 / Indoor Std / AS923-25 / Neal Demo |
| 0 | eui-60c5a8fffe74d343 | 4inz | -45.86389324, 170.51331969 | 4i Systems Dunedin |
| 0 | eui-5049530010417aa1 | andkiw | -43.5581, 172.5978 | |
| 0 | eui-323531324c006f00 | frizzell | -43.29520696, 172.19985502 | Mikrotik Lora 9 Kit |
| 0 | eui-323531321d006100 | soundsnet | -41.00448713, 173.99605009 | Soundsnet LoRa |
| 0 | eui-3235313216004e00 | soundsnet | -41.2766806, 174.01924204 | Soundsnet Picton |
| 0 | eui-24e124fffef03f7e | vangalvin | -36.91569677, 174.88977499 | UG87 Gateway |
| 0 | eui-24e124fffef039d5 | crtag | -36.80233329, 174.6997014 | Disquva UG85 |
| 0 | eui-00800000a000380e | bettersense-sam | -36.89491727, 174.74280674 | bs_test_multitech-lap3 |
| 0 | coldcreek-gw-1 | unknown | -45.91360334, 170.4672712 | Cold Creek Gateway 1 with Balena |
| -5 | eui-00800000a0003c2b | maj | -41.101070404052734, 173.96408081054688 | Marlborough District Council - Meshed - AS923 |
| - | rg1xx29404b | unknown | unknown | Tom Costello NZ - Laird RG191 |
| - | eui-fffeb827eba6e018 | unknown | unknown | McQueens Valley TTN Gateway |
| - | eui-b827ebfffede8aa7 | unknown | unknown | Visual AG Peters Farm |
| - | eui-b827ebfffe5cdd3a | unknown | unknown | Moorpark & Mulberry Orchard Gateway 01 |
| - | eui-a840411b7d90ffff | unknown | unknown | IoB-Gateway-002 |
| - | eui-a8404117faa1ffff | unknown | unknown | DuinoTech 915 MHz LoRa & WiFi IoT Gateway (XC-4394) |
| - | eui-60c5a8fffe761489 | unknown | unknown | CD_RAK7249_001 |
| - | eui-60c5a8fffe761390 | unknown | unknown | RonaBay |
| - | eui-24e124fffef0aa0b | unknown | unknown | A true 8 channel professional outdoor gateway! |
| - | eui-24e124fffef07163 | unknown | unknown | Gateway |