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HGT\n\nGo module to read elevation data from SRTM HGT files.\n\n## Supported data\n\n- 30m (1 arc second)\n- 90m (3 arc seconds)\n\n## Usage\n\n### Read from data directory\n\n```go\nh, err := hgt.OpenDataDir(\"data\", nil)\nif err != nil {\n    log.Fatal(err)\n}\ne, r, err := h.ElevationAt(48.7162, 21.2613)\nif err != nil {\n    log.Println(err)\n}\nlog.Printf(\"elevation=%d resolution=%d\", e, r)\n```\n\nExample using custom cache with module [golang-lru](https://github.com/hashicorp/golang-lru).\n\n```go\nlruCache, err := lru.NewWithEvict(1000, func(key, value interface{}) {\n    if file, ok := value.(*hgt.File); ok {\n        file.Close()\n    }\n})\nif err != nil {\n    log.Fatal(err)\n}\ncache := \u0026hgt.Cache{\n    OnGet: func(key string) (*hgt.File, bool) {\n        if v, ok := lruCache.Get(key); ok {\n            return v.(*hgt.File), true\n        }\n        return nil, false\n    },\n    OnAdd: func(key string, value *hgt.File) {\n        lruCache.Add(key, value)\n    },\n    OnClear: func() error {\n        lruCache.Purge()\n        return nil\n    },\n}\nh, err := hgt.OpenDataDir(\"data\", \u0026hgt.DataDirOptions{\n    Cache:          cache,\n    RangeValidator: hgt.DefaultRangeValidator(),\n})\nif err != nil {\n    log.Fatal(err)\n}\ndefer h.Close()\ne, r, err := h.ElevationAt(48.7162, 21.2613)\nif err != nil {\n    log.Println(err)\n}\nlog.Printf(\"elevation=%d resolution=%d\", e, r)\n```\n\n### Read from single file\n\n```go\nh, err := hgt.Open(\"data/N48E021.hgt\", nil)\nif err != nil {\n    log.Fatal(err)\n}\ndefer h.Close()\ne, r, err := h.ElevationAt(48.7162, 21.2613)\nif err != nil {\n    log.Println(err)\n}\nlog.Printf(\"elevation=%d resolution=%d\", e, r)\n```\n\n### Range validator\n\nDefault range validator respects SRTM latitude limits. For other datasets it is possible to configure custom validator.\n\n```go\nh, err := hgt.OpenDataDir(\"data\", \u0026hgt.DataDirOptions{\n    Cache: hgt.DefaultCache(),\n    RangeValidator: func(lat, lon float64) error {\n        if lat \u003c 48.5 || lat \u003e= 48.7 {\n            return hgt.ErrorOutOfRange\n        }\n        return nil\n    },\n})\nif err != nil {\n    log.Fatal(err)\n}\n```\n\n## License\n\nLicensed under MIT license.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpetoc%2Fhgt","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fpetoc%2Fhgt","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpetoc%2Fhgt/lists"}