LoRaWAN-Signal-Mapping/common/Normalisers.mjs

"use strict";

import { normalise, clamp } from './Math.mjs';

function normalise_lat(lat) {
	return normalise(lat,
		{ min: -90, max: +90 },
		{ min: 0, max: 1 }
	);
}
	
function normalise_lng(lng) {
	return normalise(lng,
		{ min: -180, max: +180 },
		{ min: 0, max: 1 }
	);
}

function unnormalise_lat(nlat) {
	return normalise(nlat,
		{ min: 0, max: 1 },
		{ min: -90, max: +90 }
	);
}
	
function unnormalise_lng(nlng) {
	return normalise(nlng,
		{ min: 0, max: 1 },
		{ min: -180, max: +180 }
	);
}

function normalise_gateway_distance(distance) {
	return clamp(normalise(distance,
		{ min: 0, max: 75000 },
		{ min: 0, max: 1 }
	), 0, 1);
}

function unnormalise_gateway_distance(ndistance) {
	return normalise(ndistance,
		{ min: 0, max: 1 },
		{ min: 0, max: 20000 }
	);
}

function normalise_rssi(rssi) {
	return clamp(normalise(rssi,
		{ min: -150, max: 0 },
		{ min: 0, max: 1 }
	), 0, 1)
}
function unnormalise_rssi(rssi) {
	return normalise(rssi,
		{ min: 0, max: 1 },
		{ min: -150, max: 0 }
	);
}

export {
	normalise_lat,
	normalise_lng,
	unnormalise_lat,
	unnormalise_lng,
	
	normalise_gateway_distance,
	unnormalise_gateway_distance,
	
	normalise_rssi,
	unnormalise_rssi
};