Add r.usler module

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@33828 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.usler/Makefile

@@ -0,0 +1,10 @@
+MODULE_TOPDIR = ../..
+
+PGM = r.usler
+
+LIBES = $(GISLIB)
+DEPENDENCIES = $(GISDEP)
+
+include $(MODULE_TOPDIR)/include/Make/Module.make
+
+default: cmd

raster/r.usler/elswaify85.c

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+#include<stdio.h>
+#include<math.h>
+#include<stdlib.h>
+
+double elswaify_1985(double annual_pmm) 
+{
+    double result;
+
+    result = ((annual_pmm * 0.35) + 38.5);
+    return result;
+}
+
+

raster/r.usler/foster81.c

@@ -0,0 +1,13 @@
+#include<stdio.h>
+#include<math.h>
+#include<stdlib.h>
+
+double foster_1981(double annual_pmm) 
+{
+    double result;
+
+    result = ((annual_pmm * 0.276 * 75.0) / 100.0);
+    return result;
+}
+
+

raster/r.usler/main.c

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+/****************************************************************************
+ *
+ * MODULE:       r.usler
+ * AUTHOR(S):    Natalia Medvedeva - natmead@gmail.com
+ *		 Yann Chemin - yann.chemin@gmail.com
+ * PURPOSE:      Calculates USLE R factor 
+ * 		 Rainfall Erosion index according to four methods 
+ *
+ * COPYRIGHT:    (C) 2002-2008 by the GRASS Development Team
+ *
+ *               This program is free software under the GNU General Public
+ *   	    	 License (>=v2). Read the file COPYING that comes with GRASS
+ *   	    	 for details.
+ * 
+ *****************************************************************************/
+    
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <grass/gis.h>
+#include <grass/glocale.h>
+
+double elswaify_1985(double annaul_pmm);
+double morgan_1974(double annual_pmm);
+double foster_1981(double annual_pmm);
+double roose_1975(double annual_pmm);
+
+int main(int argc, char *argv[]) 
+{
+    int nrows, ncols;
+    int row, col;
+    char *nameflag;		/*Switch for particular method */
+    struct GModule *module;
+    struct Option *input1, *input2, *output;
+    struct History history;	/*metadata */
+
+    /************************************/ 
+    char *result;		/*output raster name */
+    int infd_annual_pmm;
+    int outfd;
+    char *annual_pmm;
+
+    void *inrast_annual_pmm;
+    DCELL * outrast;
+
+    /************************************/ 
+    G_gisinit(argv[0]);
+
+    module = G_define_module();
+    module->keywords = _("rainfall, erosion, USLE");
+    module->description = _("raster, USLE R factor, Rainfall erosivity index.");
+    
+    /* Define the different options */ 
+    input1 = G_define_option();
+    input1->key = _("method");
+    input1->type = TYPE_STRING;
+    input1->required = YES;
+    input1->gisprompt = _("Name of method to use");
+    input1->description =
+	_("Name of USLE R equation: roose, morgan, foster, elswaify.");
+    input1->answer = _("morgan");
+
+    input2 = G_define_standard_option(G_OPT_R_INPUT);
+    input2->description = _("Name of the annual precipitation map");
+
+    output = G_define_standard_option(G_OPT_R_OUTPUT);
+    output->description = _("Name of the output usler layer");
+    
+    /********************/ 
+    if (G_parser(argc, argv))
+        exit(EXIT_FAILURE);
+
+    nameflag = input1->answer;
+    annual_pmm = input2->answer;
+    result = output->answer;
+    
+    /***************************************************/ 
+    if ((infd_annual_pmm = G_open_cell_old(annual_pmm, "")) < 0)
+	G_fatal_error(_("Cannot open cell file [%s]"), annual_pmm);
+    inrast_annual_pmm = G_allocate_d_raster_buf();
+    
+    /***************************************************/ 
+    nrows = G_window_rows();
+    ncols = G_window_cols();
+    outrast = G_allocate_d_raster_buf();
+    
+    /* Create New raster files */ 
+    if ((outfd = G_open_raster_new(result, DCELL_TYPE)) < 0)
+	G_fatal_error(_("Could not open <%s>"), result);
+    
+    /* Process pixels */ 
+    for (row = 0; row < nrows; row++)
+    {
+        DCELL d;
+	DCELL d_annual_pmm;
+	G_percent(row, nrows, 2);
+	
+	/* read input map */ 
+	if (G_get_d_raster_row(infd_annual_pmm, inrast_annual_pmm, row) < 0)
+	    G_fatal_error(_("Could not read from <%s>"), annual_pmm);
+	
+	/*process the data */ 
+	for (col = 0; col < ncols; col++)
+	{
+	    d_annual_pmm = ((DCELL *) inrast_annual_pmm)[col];
+	    if (G_is_d_null_value(&d_annual_pmm)) 
+		G_set_d_null_value(&outrast[col], 1);
+	    else 
+            {
+                /*calculate morgan       */ 
+                if (!strcmp(nameflag, "morgan"))
+                    d = morgan_1974(d_annual_pmm);
+		/*calculate roose        */ 
+		if (!strcmp(nameflag, "roose")) 
+		    d = roose_1975(d_annual_pmm);
+		/*calculate foster       */ 
+		if (!strcmp(nameflag, "foster"))
+		    d = foster_1981(d_annual_pmm);
+		/*calculate elswaify     */ 
+		if (!strcmp(nameflag, "elswaify")) 
+		    d = elswaify_1985(d_annual_pmm);
+	    }
+	if (G_put_d_raster_row(outfd, outrast) < 0)
+	    G_fatal_error(_("Cannot write to output raster file"));
+	}
+    }
+    G_free(inrast_annual_pmm);
+    G_close_cell(infd_annual_pmm);
+    G_free(outrast);
+    G_close_cell(outfd);
+
+    G_short_history(result, "raster", &history);
+    G_command_history(&history);
+    G_write_history(result, &history);
+
+    exit(EXIT_SUCCESS);
+}
+
+

raster/r.usler/morgan74.c

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+#include<stdio.h>
+#include<math.h>
+#include<stdlib.h>
+
+double morgan_1974(double annual_pmm) 
+{
+    double result;
+
+    result = (((annual_pmm * 9.28) - 8838.0) * 75.0) / 1000.0;
+    return result;
+}
+
+

raster/r.usler/r.usler.html

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+<H2>DESCRIPTION</H2>
+
+<EM>r.usler</EM> calculates USLE R factor for Rainfall erosivity. It enables several empirical equations: Roosle (1975), Morgan (1974), Foster(1981) and El-Swaify (1985).
+
+<H2>NOTES</H2>
+
+<H2>TODO</H2>
+
+
+<H2>SEE ALSO</H2>
+
+<em>
+<A HREF="r.uslek.html">r.uslek</A><br>
+<A HREF="r.watershed.html">r.watershed</A><br>
+</em>
+
+
+<H2>AUTHORS</H2>
+Natialia Medvedeva, SIC-ISDC, Ashgabat, Turkmenistan<BR>
+Yann Chemin, SIC-ISDC, Ashgabat, Turkmenistan<BR>
+
+
+<p>
+<i>Last changed: $Date: 2008/10/12 08:30:42 $</i>

raster/r.usler/roose75.c

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+#include<stdio.h>
+#include<math.h>
+#include<stdlib.h>
+
+double roose_1975(double annual_pmm) 
+{
+    double result;
+
+    result = annual_pmm * 0.5 * 1.73;
+    return result;
+}
+
+