added getProjString

README.md

@@ -7,7 +7,7 @@ Super Light-Weight Utility Functions for Working with Universal Transverse Merca
 const isUTM = require('utm-utils/src/isUTM');
 
 const result = isUTM(32619);
-//true
+// true
 ```
 
 # Get Hemisphere from EPSG Code
@@ -26,5 +26,13 @@ const zone = getZone('32617');
 // 17
 ```
 
+# Get PROJ String from EPSG Code
+```javascript
+const getProjString = require('utm-utils/src/getProjString');
+
+const projString = getProjString('32617');
+// +proj=utm +zone=17 +ellps=WGS84 +datum=WGS84 +units=m +no_defs
+```
+
 # Support
 Email the package author at [email protected] or post an issue at https://github.com/danieljdufour/utm-utils/issues

package.json

@@ -1,6 +1,6 @@
 {
   "name": "utm-utils",
-  "version": "0.0.1",
+  "version": "0.1.0",
   "description": "Super Light-Weight Utility Functions for Working with Universal Transverse Mercator",
   "main": "src/",
   "scripts": {

src/getProjString.js

@@ -0,0 +1,8 @@
+const getZone = require('./getZone');
+const getHemisphere = require('./getHemisphere');
+
+module.exports = function getProjString (projection) {
+    const zone = getZone(projection);
+    const hemisphere = getHemisphere(projection);
+    return `+proj=utm +zone=${zone}${hemisphere === 'S' ? ' +south ' : ' '}+ellps=WGS84 +datum=WGS84 +units=m +no_defs`;
+};

test.js

@@ -1,5 +1,6 @@
 const { expect } = require('chai');
 const isUTM = require('./src/isUTM.js');
+const getProjString = require('./src/getProjString');
 const getHemisphere = require('./src/getHemisphere.js');
 const getZone = require('./src/getZone.js');
 
@@ -26,3 +27,9 @@ describe("Check Zone Identification", function () {
         expect(getZone(32618)).to.equal(18);
     });
 });
+
+describe("Check Proj String Conversion", function () {
+    it("Get Proj String", function() {
+        expect(getProjString(32618)).to.equal('+proj=utm +zone=18 +ellps=WGS84 +datum=WGS84 +units=m +no_defs');
+    });
+});