feat: vincenty's (maybe)
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8 changed files with 369 additions and 34 deletions
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<orderEntry type="inheritedJdk" />
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@ -11,6 +11,9 @@
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import {borderLUT, fillLUT} from "$lib/alertLayer";
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categories: LayerList;
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@ -143,12 +146,104 @@
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map.getCanvas().style.cursor = '';
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(async () => {
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let r = await fetch('http://localhost:3000/v2/nexrad/l2/KM/1/REF');
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})();
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let r = await fetch('http://localhost:3000/v2/nexrad/l2/KFSD/1/REF');
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const buf = await r.arrayBuffer();
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const container = CifContainer.fromBinary(new Uint8Array(buf));
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console.log('wxrad http://localhost:3000/v2/nexrad/l2/KFSD/1/REF: ', container);
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const dataLayer = {
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id: 'dataGl',
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type: 'custom',
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onAdd(map, gl) {
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const vertexShader = gl.createShader(gl.VERTEX_SHADER);
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gl.compileShader(vertexShader);
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const fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);
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gl.shaderSource(fragmentShader, fragmentSource);
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gl.compileShader(fragmentShader);
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this.program = gl.createProgram();
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gl.attachShader(this.program, vertexShader);
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gl.attachShader(this.program, fragmentShader);
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gl.linkProgram(this.program);
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this.aPos = gl.getAttribLocation(this.program, 'a_pos');
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/*
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110.574 km = 1 deg
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deg = 1/110.574 km
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111.320 * cos(latitude) km = 1 deg
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*/
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const lat = 43.58777778;
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const long = -96.72944444;
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const radar_range_maximum = 560; // ish km
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const degrees_of_lat = radar_range_maximum / 110.574;
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const degrees_of_long = radar_range_maximum / (111.320 * Math.cos(degreesToRadians(lat)));
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// A-C
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// B-D
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const a = maplibregl.MercatorCoordinate.fromLngLat({
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lng: long - degrees_of_long,
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lat: lat + degrees_of_lat
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});
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const b = maplibregl.MercatorCoordinate.fromLngLat({
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lng: long - degrees_of_long,
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lat: lat - degrees_of_lat
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});
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const c = maplibregl.MercatorCoordinate.fromLngLat({
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lng: long + degrees_of_long,
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lat: lat + degrees_of_lat
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});
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const d = maplibregl.MercatorCoordinate.fromLngLat({
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lng: long + degrees_of_long,
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lat: lat - degrees_of_lat
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});
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this.buffer = gl.createBuffer();
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gl.bindBuffer(gl.ARRAY_BUFFER, this.buffer);
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gl.bufferData(
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gl.ARRAY_BUFFER,
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new Float32Array([
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a.x,
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a.y,
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b.x,
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b.y,
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c.x,
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c.y,
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b.x,
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b.y,
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d.x,
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d.y,
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c.x,
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c.y,
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]),
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gl.STATIC_DRAW
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);
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},
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render(gl, args) {
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gl.useProgram(this.program);
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gl.uniformMatrix4fv(
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gl.getUniformLocation(this.program, 'u_matrix'),
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false,
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args.defaultProjectionData.mainMatrix
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);
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gl.bindBuffer(gl.ARRAY_BUFFER, this.buffer);
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gl.enableVertexAttribArray(this.aPos);
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gl.vertexAttribPointer(this.aPos, 2, gl.FLOAT, false, 0, 0);
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gl.enable(gl.BLEND);
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gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
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gl.drawArrays(gl.TRIANGLES, 0, 6);
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}
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}
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map.addLayer(dataLayer);
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});
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map.on('error', (e) => {
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console.error(e);
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92
client/src/lib/map/fragment.glsl
Normal file
92
client/src/lib/map/fragment.glsl
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#version 300 es
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precision highp float;
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#define PI 3.141592653589793238462643
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out highp vec4 fragColor;
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uniform mat4 u_matrix;
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void xyToLngLat(in float x, in float y, out float lat, out float lng) {
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lng = x * 360.0 - 180.0;
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float y2 = 180.0 - y * 360.0;
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lat = 360.0 / PI * atan(exp(y2 * PI / 180.0)) - 90.0;
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}
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in vec4 raw_pos;
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#define a 6378137.0
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#define f 1.0 / 298.257223563
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#define b 6356752.314245
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bool vincenty(in float phi1, in float phi2, in float l1, in float l2, out float a1, out float a2, out float s) {
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float u1 = atan((1.0 - f) * tan(phi1));
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float u2 = atan((1.0 - f) * tan(phi2));
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float L = l2 - l1;
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float lambda = L;
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float sinSigma;
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float cosSigma;
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float sigma;
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float sinAlpha;
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float cosSquaredAlpha;
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float cos2OmegaM;
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float C;
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// sometimes fails to converge. set maximum iteration count
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int iterCount = 0;
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while (lambda > pow(10.0, -12.0)) {
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iterCount++;
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if (iterCount > 10) {
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return false;
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}
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sinSigma = sqrt(pow(cos(u2)*sin(lambda), 2.0) + pow(cos(u1)*sin(u2)-sin(u1)*cos(u2)*cos(lambda),2.0));
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cosSigma = sin(u1)*sin(u2)+cos(u1)*cos(u2)*cos(lambda);
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sigma = atan(sinSigma,cosSigma);
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|
||||
sinAlpha = (cos(u1)*cos(u2)*sin(lambda))/(sinSigma);
|
||||
cosSquaredAlpha = 1.0 - pow(sinAlpha, 2.0);
|
||||
cos2OmegaM = cosSigma - (2.0*sin(u1)*sin(u2))/(cosSquaredAlpha);
|
||||
C = f/16.0 * cosSquaredAlpha * (4.0 + f * (4.0 - 3.0 * cosSquaredAlpha));
|
||||
lambda = L + (1.0 - C) * f * sinAlpha * (sigma + C * sinSigma * (cos2OmegaM + C*cosSigma * (-1.0 + 2.0 * pow(cos2OmegaM, 2.0))));
|
||||
}
|
||||
|
||||
float uSquared = cosSquaredAlpha * ((pow(a, 2.0) - pow(b, 2.0))/pow(b, 2.0));
|
||||
float A = 1.0 + uSquared/16384.0 * (4096.0 + uSquared * (-768.0 + uSquared * (320.0 - 175.0*uSquared)));
|
||||
float B = uSquared / 1024.0 * (256.0 + uSquared * (-128.0 + uSquared * (74.0 - 47.0*uSquared)));
|
||||
|
||||
float deltaSigma = B * sinSigma * (cos2OmegaM + 1.0/4.0*B * (cosSigma * (-1.0 + 2.0*pow(cos2OmegaM,2.0)) - 1.0/6.0*B*cos2OmegaM*(-3.0+4.0*pow(sinSigma,2.0))*(-3.0+4.0*pow(cos2OmegaM,2.0))));
|
||||
s = b*A*(sigma - deltaSigma);
|
||||
a1 = atan(cos(u2)*sin(lambda), cos(u1)*sin(u2)-sin(u1)*cos(u2)*cos(lambda));
|
||||
a2 = atan(cos(u1)*sin(lambda), -sin(u1)*cos(u2)+cos(u1)*sin(u2)*cos(lambda));
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
void main() {
|
||||
float lat;
|
||||
float lng;
|
||||
xyToLngLat(raw_pos.x, raw_pos.y, lat, lng);
|
||||
|
||||
float radarLat = 43.58777778;
|
||||
float radarLng = -96.72944444;
|
||||
|
||||
float a1;
|
||||
float a2;
|
||||
float s;
|
||||
;
|
||||
|
||||
// should be 43.58777778
|
||||
// 88 > x > 89
|
||||
// >40.0
|
||||
float delta = 0.01;
|
||||
//
|
||||
// abs(lat-43.5877) <delta && abs(lng+96.72944444)<delta
|
||||
if (vincenty(radians(radarLat), radians(lat), radians(radarLng), radians(lng), a1, a2, s)) {
|
||||
fragColor = vec4(0.0, 1.0, 0.0, 0.5);
|
||||
} else {
|
||||
fragColor = vec4(1.0, 0.0, 0.0, 0.5);
|
||||
}
|
||||
}
|
||||
13
client/src/lib/map/vertex.glsl
Normal file
13
client/src/lib/map/vertex.glsl
Normal file
|
|
@ -0,0 +1,13 @@
|
|||
#version 300 es
|
||||
|
||||
precision highp float;
|
||||
|
||||
uniform mat4 u_matrix;
|
||||
in vec2 a_pos;
|
||||
|
||||
out vec4 raw_pos;
|
||||
|
||||
void main() {
|
||||
raw_pos = vec4(a_pos, 0.0, 1.0);
|
||||
gl_Position = u_matrix * vec4(a_pos, 0.0, 1.0);
|
||||
}
|
||||
|
|
@ -26,3 +26,15 @@ Color4: 60 255 0 255 255 128 0 128 255
|
|||
Color4: 70 255 255 255 255 128 128 128 255
|
||||
Color4: 80 128 128 128 255
|
||||
"""
|
||||
|
||||
[data.nexrad.l2]
|
||||
palette = """
|
||||
Color4: 10 164 164 255 0 100 100 192 255
|
||||
Color4: 20 64 128 255 255 32 64 128 255
|
||||
Color4: 30 0 255 0 255 0 128 0 255
|
||||
Color4: 40 255 255 0 255 255 128 0 255
|
||||
Color4: 50 255 0 0 255 160 0 0 255
|
||||
Color4: 60 255 0 255 255 128 0 128 255
|
||||
Color4: 70 255 255 255 255 128 128 128 255
|
||||
Color4: 80 128 128 128 255
|
||||
"""
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue