fix: nzmap slice index out of bound

[junghao]

Proposed Changes

Saw a crash in logs

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www-geonet/96e661d 2026/09/01 23:50:51 http: panic serving 172.31.6.150:30538: runtime error: index out of range [140] with length 140

www-geonet/96e661d 2026/09/01 23:50:51 http: panic serving 172.31.6.150:30538: runtime error: index out of range [140] with length 140
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goroutine 2520026 [running]:
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net/http.(*conn).serve.func1()
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/usr/local/go/src/net/http/server.go:1897 +0xbd
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panic({0xb4f880?, 0x16050b3c60a8?})
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/usr/local/go/src/runtime/panic.go:860 +0x13a
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github.com/GeoNet/kit/map180/nzmap.Points.Medium({0x160509d3dc08, 0xa, 0x497e88?}, 0x16050c7a27e0)
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/repo/vendor/github.com/GeoNet/kit/map180/nzmap/nzmap.go:266 +0x517
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main.(*quakeHistory).originMap(0x16050b1cc420)
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/repo/cmd/www-geonet/quake_history.go:128 +0x2a5
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main.quakeHistoryHandler(0x160509d74140, 0x3?, 0x16050c822060, {0x16050b4be060, 0x14})
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/repo/cmd/www-geonet/quake_history.go:63 +0x43a
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main.createMux.MakeHandlerWithCspNonce.func25({0xc0e500, 0x16050c8a6000}, 0x160509d74140)
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/repo/vendor/github.com/GeoNet/kit/weft/handlers.go:208 +0x1b3
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net/http.HandlerFunc.ServeHTTP(0x160509bea000?, {0xc0e500?, 0x16050c8a6000?}, 0xb97788?)
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/usr/local/go/src/net/http/server.go:2286 +0x29
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net/http.(*ServeMux).ServeHTTP(0x16050c8240f0?, {0xc0e500, 0x16050c8a6000}, 0x160509d74140)
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/usr/local/go/src/net/http/server.go:2828 +0x1c7
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main.main.inbound.func2({0xc0e500, 0x16050c8a6000}, 0x160509d74140)
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/repo/cmd/www-geonet/inbound.go:13 +0x77
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net/http.HandlerFunc.ServeHTTP(0x485179?, {0xc0e500?, 0x16050c8a6000?}, 0x160509dcfb30?)
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/usr/local/go/src/net/http/server.go:2286 +0x29
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net/http.serverHandler.ServeHTTP({0x16050a41f140?}, {0xc0e500?, 0x16050c8a6000?}, 0x6?)
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/usr/local/go/src/net/http/server.go:3311 +0x8e
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net/http.(*conn).serve(0x16050b961560, {0xc0f168, 0x16050b260210})
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/usr/local/go/src/net/http/server.go:2067 +0x690
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created by net/http.(*Server).Serve in goroutine 1
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/usr/local/go/src/net/http/server.go:3464 +0x485

Changes proposed in this pull request:

• nzmap.go

Production Changes

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• None

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