correct i,j to nmi conversion

Author: netbymatt

README.md

@@ -1,6 +1,6 @@
 # nexrad-level-3-data
 
-### v0.3.3
+### v0.3.4
 A javascript implementation for decoding Nexrad Level III radar files.
 
 You can find more information on how radar data is encoded at [NOAA](https://www.roc.noaa.gov/WSR88D/BuildInfo/Files.aspx). The work in this project is based mainly on the document [2620001 ICD FOR THE RPG TO CLASS 1 USER - Build 19.0](https://www.roc.noaa.gov/wsr88d/PublicDocs/ICDs/2620001Y.pdf).

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nexrad-level-3-data",
-  "version": "0.3.3",
+  "version": "0.3.4",
   "description": "Parsing of NEXRAD level 3 data files",
   "main": "src/index.js",
   "scripts": {

src/packets/utilities/ij.js

@@ -2,10 +2,10 @@
 
 // i,j to azimuth/nmi
 
-// default is 4096 i/j units, 248 mi range, converted to nautical miles = 1nmi = 1.15078mi
-const ijToAzDeg = (i, j, rawMax = 4096, range = 248, conversion = 1.15078) => {
+// default is 4096 i/j units * 0.125 km, converted to nautical miles = 1km = 0.539957nmi
+const ijToAzDeg = (i, j, rawScale = 8, conversion = 0.539957) => {
 	// calculate nautical miles
-	const nm = ((Math.sqrt(i ** 2 + j ** 2) / rawMax) * range) * conversion;
+	const nm = (Math.sqrt(i ** 2 + j ** 2) / rawScale) * conversion;
 	let deg = 0;
 	// short circuit potential divide by zero
 	if (i === 0) {