Add snow depth color thresholds

web/src/pages/harmonie/draw/constants.ts

@@ -27,6 +27,21 @@ export const PRECIPITATION: ColorEntry[] = [
     { value: 0.1, color: [152, 233, 252, 0] },
 ]
 
+export const SNOW_DEPTH: ColorEntry[] = [
+    { value: 40, color: [126, 26, 99, 255] },
+    { value: 30, color: [120, 27, 131, 255] },
+    { value: 20, color: [84, 20, 130, 255] },
+    { value: 15, color: [49, 16, 129, 255] },
+    { value: 10, color: [9, 15, 129, 255] },
+    { value: 7, color: [0, 24, 150, 255] },
+    { value: 6, color: [0, 43, 186, 255] },
+    { value: 5, color: [10, 70, 220, 255] },
+    { value: 4, color: [40, 109, 246, 255] },
+    { value: 3, color: [80, 162, 248, 255] },
+    { value: 2, color: [118, 202, 249, 255] },
+    { value: 1, color: [152, 233, 252, 0] },
+]
+
 // from ltv
 export const TEMPERATURES: ColorEntry[] = [
     { value: 35, color: [155, 30, 30, 255] },

web/src/pages/harmonie/draw/drawGrib.ts

@@ -8,6 +8,7 @@ import { temperatureColors } from './temperature'
 import { isCalculatedWindDirection, windDirectionArrows, windDirectionColors, windSpeedColors } from './windDirection'
 
 import latvia_border from '../../../assets/latvia_contour.webp'
+import { snowDepthColors } from './snowDepth'
 const latviaBoderImg = new Image()
 latviaBoderImg.onload = () => {}
 latviaBoderImg.src = latvia_border
@@ -123,7 +124,7 @@ function fillImageData(
                 color = precipitationColors(encodedValue, conversion, isInterpolated)
             }
             else if (isMeteoEqual(meteo, SNOW_DEPTH)) {
-                color = precipitationColors(encodedValue, conversion, isInterpolated)
+                color = snowDepthColors(encodedValue, conversion, isInterpolated)
             }
             else if (isMeteoEqual(meteo, TEMPERATURE)) {
                 color = temperatureColors(encodedValue, conversion, isInterpolated)

web/src/pages/harmonie/draw/snowDepth.ts

@@ -0,0 +1,15 @@
+import { valueToColorInterpolated, valueToColorThreshold } from '../../../helpers/interpolateColors'
+import { MeteoConversion } from '../interfaces'
+import { SNOW_DEPTH } from './constants'
+
+export function snowDepthColors(
+    encodedValue: number,
+    { reference, binaryScale, decimalScale}: MeteoConversion,
+    isInterpolated = true,
+): [number, number, number, number] {
+    const rainMM = (reference + encodedValue * Math.pow(2, binaryScale)) * Math.pow(10, -decimalScale)
+
+    return isInterpolated
+        ? valueToColorInterpolated(rainMM, SNOW_DEPTH)
+        : valueToColorThreshold(rainMM, SNOW_DEPTH)
+}