Update README.md

README.md

@@ -12,10 +12,60 @@ An application for generating Digital Elevation Models (DEM) with Gaussian Marko
   * A C++ compiler: GCC, clang, Visual C++ 2012 or above recommended.
   * [MRPT](www.mrpt.org) >= 1.4.0
 
+# Input file formats
+
+* XYZ: Plain text file, each row containing one height (Z) measurement: (separated by whitespaces or commas `,`)
+
+        X    Y    Z
+
+* XYZS: Plain text file, each row containing one height (Z) measurement and its uncertainty (standard deviation): (separated by whitespaces or commas `,`)
+
+        X    Y    Z  STD_DEV
+
 # Usage
 
-* Show all available parameters: 
+		   dem-gmrf  [--no-gui] [--skip-variance] [--std-obs <0.20>] [--std-prior
+					 <1.0>] [-c <0.01>] [-o <demgmrf_out>] [-r <1.0>] -i <xyz.txt>
+					 [--] [--version] [-h]
+
+
+		Where:
+
+		   --no-gui
+			 Do not show the graphical window with the 3D visualization at end.
+
+		   --skip-variance
+			 Skip variance estimation
+
+		   --std-obs <0.20>
+			 Default standard deviation of each XYZ point observation [meters]
+
+		   --std-prior <1.0>
+			 Standard deviation of the prior constraints (`smoothness` or
+			 `tolerance`of the terrain) [meters]
+
+		   -c <0.01>,  --checkpoint-ratio <0.01>
+			 Ratio (1.0=all,0.0=none) of data points to use as checkpoints. They
+			 will not be inserted in the DEM. (Default=0.01)
+
+		   -o <demgmrf_out>,  --output-prefix <demgmrf_out>
+			 Prefix for all output filenames
+
+		   -r <1.0>,  --resolution <1.0>
+			 Resolution (side length) of each cell in the DEM (meters)
+
+		   -i <xyz.txt>,  --input <xyz.txt>
+			 (required)  Input dataset file: X,Y,Z points in plain text format
+
+		   --,  --ignore_rest
+			 Ignores the rest of the labeled arguments following this flag.
+
+		   --version
+			 Displays version information and exits.
 
-        dem-gmrf --help
+		   -h,  --help
+			 Displays usage information and exits.
+				
+