correct divide by zero check

Author: netbymatt

README.md

@@ -1,6 +1,6 @@
 # nexrad-level-3-data
 
-### v0.3.2
+### v0.3.3
 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": "0.3.2",
+  "version": "0.3.3",
   "description": "Parsing of NEXRAD level 3 data files",
   "main": "src/index.js",
   "scripts": {

src/packets/utilities/ij.js

@@ -8,7 +8,7 @@ const ijToAzDeg = (i, j, rawMax = 4096, range = 248, conversion = 1.15078) => {
 	const nm = ((Math.sqrt(i ** 2 + j ** 2) / rawMax) * range) * conversion;
 	let deg = 0;
 	// short circuit potential divide by zero
-	if (i !== j) {
+	if (i === 0) {
 		// calculate degrees, then rotate due to north = up = 0 deg convention
 		deg = (Math.atan(-j / i) * 180) / Math.PI + 90;
 		// coerce to 0<=deg<360