From 6849b266592de1b71df70b5eac3ed65df2a3029d Mon Sep 17 00:00:00 2001
From: "Andrew W. Hill" <andrewxhill@gmail.com>
Date: Thu, 2 Apr 2015 14:28:02 -0400
Subject: [PATCH] Update README.md

---
 README.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/README.md b/README.md
index e498f66..6fd6832 100644
--- a/README.md
+++ b/README.md
@@ -270,6 +270,11 @@ Create shapefile based on parameters listed in the .vrt
 
 The VRT file can be modified to give a new output shapefile name, reference a different coordinate system (LayerSRS), or pull coordinates from different columns.
 
+__Extract polygons from raster__
+
+	gdal_polygonize.py input.tif -f "GeoJSON" output.json
+
+
 __MODIS operations__
 
 First, download relevant .hdf tiles from the MODIS ftp site: <ftp://ladsftp.nascom.nasa.gov/>; use the [MODIS sinusoidal grid](http://www.geohealth.ou.edu/modis_v5/modis.shtml) for reference.