commit 607796d75448998e4f2e63e68264164e43b16fba parent 9c1d76c77759cb538dda39e57d7a183f65ede5f3 Author: Sergej Orlov <wladimirych@gmail.com> Date: Thu, 16 Mar 2017 00:56:57 +0300 module to get magnetic declination at (lat,lon) Diffstat:
| A | src/lib/magnetic-declination/declination.json | | | 11 | +++++++++++ |
| A | src/lib/magnetic-declination/index.js | | | 61 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 72 insertions(+), 0 deletions(-)
diff --git a/src/lib/magnetic-declination/declination.json b/src/lib/magnetic-declination/declination.json @@ -0,0 +1,10 @@ +{ + "minLat": -58, + "step": 2, + "rowsCount": 69, + "maxLat": 78, + "valueOffset": 76, + "array": 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", + "colsCount": 180, + "valueScale": 2.0 +} +\ No newline at end of file diff --git a/src/lib/magnetic-declination/index.js b/src/lib/magnetic-declination/index.js @@ -0,0 +1,60 @@ +import declination from './declination.json'; +import {stringToArrayBuffer} from 'lib/binary-strings'; + +let data; + +function mod(x, n) { + return ((x % n) + n) % n; +} + +function loadData() { + const ar1 = new Uint8Array(stringToArrayBuffer(atob(declination.array))); + const ar2 = new Float32Array(ar1.length); + const scale = declination.valueScale; + const offset = declination.valueOffset; + for (let i = 0; i < ar1.length; i++) { + ar2[i] = ar1[i] / scale - offset; + } + return ar2; +} + +function getArrayValue(row, col) { + if (row < 0 || col < 0 || col >= declination.colsCount || row >= declination.rowsCount ) { + throw new Error(`Invalid col/row value col=${col} row=${row}`); + } + const ind = row * declination.colsCount + col; + if (ind >= data.length) { + throw new Error('Index value out of range'); + } + return data[ind]; +} + +function getDeclination(lat, lon) { + if (lat < declination.minLat || lat > declination.maxLat) { + return null; + } + lon = mod(lon + 180, 360) - 180; + const row1 = Math.floor((lat - declination.minLat) / declination.step); + const row2 = row1 + 1; + const dlat = (lat - (row1 * declination.step + declination.minLat)) / declination.step; + let col1 = Math.floor((lon + 180) / declination.step); + let col2 = col1 + 1; + const dlon = (lon - (col1 * declination.step - 180)) / declination.step; + col1 %= declination.colsCount; + col2 %= declination.colsCount; + let a1 = getArrayValue(row1, col1); + let a2 = getArrayValue(row1, col2); + const v1 = a1 * (1 - dlon) + a2 * dlon; + if (row2 >= declination.rowsCount) { + return v1; + } + a1 = getArrayValue(row2, col1); + a2 = getArrayValue(row2, col2); + const v2 = a1 * (1 - dlon) + a2 * dlon; + const v = v1 * (1 - dlat) + v2 * dlat; + return v; +} + +data = loadData(); + +export {getDeclination} +\ No newline at end of file