From 9374b039c0b88f1ba9d8c69edd71ea04ebfad615 Mon Sep 17 00:00:00 2001
From: hblanken <hanno_blankenstein@yahoo.com>
Date: Wed, 3 May 2017 08:23:56 +1000
Subject: [PATCH] Added details for installing Grass version

Clarified that code works only with Grass 7 or higher version
---
 contrib/grass/README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/contrib/grass/README.md b/contrib/grass/README.md
index b51087b7..ed32fe63 100644
--- a/contrib/grass/README.md
+++ b/contrib/grass/README.md
@@ -3,7 +3,7 @@
 Generates DEM, contour and textured relief maps.
 
 ## Requirements
-* GRASS
+* Compile and install GRASS 7 version or higher, https://grasswiki.osgeo.org/wiki/Compile_and_Install
 * Environment variables:
   * PYTHONHOME set to the location of Python
   * PYTHONPATH set to the location of GRASS Python libs
@@ -13,4 +13,4 @@ Generates DEM, contour and textured relief maps.
 ## Usage
     python odm_grass.py <project-path>
 
-Output is `<project-path>/odm_georeferencing/odm_dem.tif`, `<project-path>/odm_georeferencing/odm_contour.shp` and `<project-path>/odm_orthophoto/odm_relief.tif`.
\ No newline at end of file
+Output is `<project-path>/odm_georeferencing/odm_dem.tif`, `<project-path>/odm_georeferencing/odm_contour.shp` and `<project-path>/odm_orthophoto/odm_relief.tif`.