add 61.ntv

Author: netbymatt

README.md

@@ -94,6 +94,7 @@ I've developed parsing algorithms for that the products that I needed most for m
 |56|N0S, N1S, N2S, N3S|Storm relative velocity|
 |58|NTP|Storm Tracking Information|
 |59|NHI|Hail Index|
+|61|NTV|Tornadic Vortex Signature|
 |62|NSS|Storm Structure|
 |78|N1P|One-hour precipitation|
 |80|NTP|Storm Total Rainfall Accumulation|

data/sn.0011

@@ -0,0 +1,40 @@
+const code = 12;
+const description = 'Tornado Vortex Signautre';
+
+const parser = (raf) => {
+	// packet header
+	const packetCode = raf.readUShort();
+	const lengthOfBlock = raf.readShort();
+
+	// test packet code
+	if (packetCode !== code) throw new Error(`Packet codes do not match ${code} !== ${packetCode}`);
+
+	// parse the data
+	const result = {
+		points: [],
+	};
+	// also providethe packet code in hex
+	result.packetCodeHex = packetCode.toString(16);
+
+	// read all special symbols
+	let i = 0;
+	for (i = 0; (i < lengthOfBlock) && (i + 4 <= lengthOfBlock); i += 4) {
+		const iStartingPoint = raf.readShort();
+		const jStartingPoint = raf.readShort();
+		result.points.push({
+			iStartingPoint,
+			jStartingPoint,
+		});
+	}
+
+	// skip past extra data
+	raf.skip(result.lengthOfBlock - i);
+
+	return result;
+};
+
+module.exports = {
+	code,
+	description,
+	parser,
+};

data/sn.0012

@@ -0,0 +1,59 @@
+// format the text data provided
+// extract data from lines that follow this format
+// "  TVS    F0    74/ 52    35    52    52/ 4.9   >11.1  < 4.9/ 16.0    16/ 4.9    "
+// using this header information
+// " Feat  Storm   AZ/RAN  AVGDV  LLDV  MXDV/Hgt   Depth    Base/Top   MXSHR/Hgt    "
+// " Type    ID   (deg,nm)  (kt)  (kt)  (kt,kft)   (kft)     (kft)     (E-3/s,kft)  "
+// returns an array of objects {
+// type: feature type
+// id: id of storm assigned by algorithm
+// az: azimuth
+// range: range to storm
+// avgdv
+// lldv
+// mxdv
+// mxdvhgt
+// depth
+// base
+// top
+// maxshear
+// maxshearheight
+// }
+
+module.exports = (data) => {
+	// extract relevant data
+	const pages = data?.tabular?.pages;
+	if (!pages) return {};
+	const result = {};
+
+	// format line by line
+	pages.forEach((page) => {
+		page.forEach((line) => {
+			// extrat values
+			const rawMatch = line.match(/ {2}([A-Z0-9]{3}) {4}([A-Z][0-9]) {3,5}([0-9.]{1,3})\/ {0,2}([0-9.]{1,3}) {3,5}([0-9.]{1,3}) {3,5}([0-9.]{1,3}) {3,5}([0-9.]{1,3})\/ {0,2}([0-9.]{1,3})[ <>]{4}([0-9.]{4})[ <>]{3,4}([0-9.]{3,4})\/ {0,2}([0-9.]{1,4}) {3,5}([0-9.]{2,4})\/ {0,2}([0-9.]{1,4})/);
+			if (!rawMatch) return;
+
+			// format the result
+			const [, type, id, az, range, avfdv, lldv, mxdv, mvdvhgt, depth, base, top, maxshear, maxshearheight] = [...rawMatch];
+			// store to array
+			result[id] = {
+				type,
+				az: +az,
+				range: +range,
+				avfdv: +avfdv,
+				lldv: +lldv,
+				mxdv: +mxdv,
+				mvdvhgt: +mvdvhgt,
+				depth: +depth,
+				base: +base,
+				top: +top,
+				maxshear: +maxshear,
+				maxshearheight: +maxshearheight,
+			};
+		});
+	});
+
+	return {
+		tvs: result,
+	};
+};

src/packets/c.js

@@ -0,0 +1,14 @@
+const code = 61;
+const abbreviation = ['NTV'];
+const description = 'Tornadic Vortex Signature';
+const formatter = require('./formatter');
+
+module.exports = {
+	code,
+	abbreviation,
+	description,
+	formatter,
+
+	productDescription: {
+	},
+};

src/products/61/formatter.js

@@ -14,6 +14,10 @@ const parser = require('./src');
 // const file = fs.readFileSync('./data/DTW_NHI_2021_04_08_19_47');
 // const file = fs.readFileSync('./data/TBW_NHI_2021_04_19_19_02');
 
+// 61 NTV
+// const file = fs.readFileSync('./data/sn.0011');
+const file = fs.readFileSync('./data/sn.0012');
+
 // 62 NSS
 // const file = fs.readFileSync('./data/TBW_NSS_2021_04_19_19_02');
 
@@ -27,7 +31,7 @@ const parser = require('./src');
 // const file = fs.readFileSync('./data/LOT_N0H_2021_01_31_11_06_30');
 
 // 172 DTA Storm Total Precipitation
-const file = fs.readFileSync('./data/LOT_DTA_2021_02_28_15_05_33');
+// const file = fs.readFileSync('./data/LOT_DTA_2021_02_28_15_05_33');
 // const file = fs.readFileSync('./data-error/LOT_DTA_2021_05_08_03_47_25');	// has error
 // const file = fs.readFileSync('./data-error/LOT_DAA_2021_05_08_03_40_29');	// different radial packet from standard = 1, no radial data