gsi 1.0.0

Implementation of a map tile retriever for 'Chi-ri-in-tile' ('地理院タイル'; ja-JP) of 'Geospatial Information Authority of Japan' (GSI).
Documentation 
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pub const PIXELS_PER_TILE_ARRIS: u16 = 256;
pub const URL_PATTERN: &str = "https://cyberjapandata.gsi.go.jp/xyz/{id}/{z}/{x}/{y}{ext}";
pub const URL_PATTERN_X: &str = "{x}";
pub const URL_PATTERN_Y: &str = "{y}";
pub const URL_PATTERN_Z: &str = "{z}";
pub const URL_PATTERN_ID: &str = "{id}";
pub const URL_PATTERN_EXT: &str = "{ext}";
pub const ID_DEM_PNG: &str = "dem_png";
pub const ID_DEM_TXT: &str = "dem";
pub const ID_DEM5A_PNG: &str = "dem5a_png";
pub const ID_DEM5B_PNG: &str = "dem5b_png";
pub const ID_DEM5C_PNG: &str = "dem5c_png";
pub const EXT_DEM_TXT: &str = ".txt";
pub const EXT_DEM_PNG: &str = ".png";
pub const DEM_PNG_RESOLUTION: f64 = 1.0e-2;
pub const ID_COCOTILE: &str = "cocotile";
pub const EXT_COCOTILE: &str = ".csv";