[GRASS-SVN] r37958 - in grass/trunk/imagery: . i.eb.h_SEBAL01
svn_grass at osgeo.org
svn_grass at osgeo.org
Fri Jun 19 08:48:44 EDT 2009
Author: ychemin
Date: 2009-06-19 08:48:44 -0400 (Fri, 19 Jun 2009)
New Revision: 37958
Added:
grass/trunk/imagery/i.eb.h_SEBAL01/
grass/trunk/imagery/i.eb.h_SEBAL01/Makefile
grass/trunk/imagery/i.eb.h_SEBAL01/i.eb.h_SEBAL01.html
grass/trunk/imagery/i.eb.h_SEBAL01/main.c
Modified:
grass/trunk/imagery/Makefile
Log:
Added sensible heat flux module
Modified: grass/trunk/imagery/Makefile
===================================================================
--- grass/trunk/imagery/Makefile 2009-06-19 12:16:10 UTC (rev 37957)
+++ grass/trunk/imagery/Makefile 2009-06-19 12:48:44 UTC (rev 37958)
@@ -7,6 +7,7 @@
i.cluster \
i.eb.evapfr \
i.eb.g0 \
+ i.eb.h_SEBAL01 \
i.emissivity \
i.find \
i.gensig \
Added: grass/trunk/imagery/i.eb.h_SEBAL01/Makefile
===================================================================
--- grass/trunk/imagery/i.eb.h_SEBAL01/Makefile (rev 0)
+++ grass/trunk/imagery/i.eb.h_SEBAL01/Makefile 2009-06-19 12:48:44 UTC (rev 37958)
@@ -0,0 +1,10 @@
+MODULE_TOPDIR = ../..
+
+PGM = i.eb.h_SEBAL01
+
+LIBES = $(GISLIB)
+DEPENDENCIES = $(GISDEP)
+
+include $(MODULE_TOPDIR)/include/Make/Module.make
+
+default: cmd
Added: grass/trunk/imagery/i.eb.h_SEBAL01/i.eb.h_SEBAL01.html
===================================================================
--- grass/trunk/imagery/i.eb.h_SEBAL01/i.eb.h_SEBAL01.html (rev 0)
+++ grass/trunk/imagery/i.eb.h_SEBAL01/i.eb.h_SEBAL01.html 2009-06-19 12:48:44 UTC (rev 37958)
@@ -0,0 +1,63 @@
+<html>
+<body>
+<H2>NAME</H2> <B><I>i.eb.h_SEBAL01 </I></B>- computation of <i>sensible heat flux</i> [W/m2] after Bastiaanssen, 1995 in [1], used in this form in 2001 by [2]. Implemented in this code in [3].
+<H2>DESCRIPTION</H2>
+
+<p><EM>i.eb.h_SEBAL01</EM> will calculate the sensible heat flux map (h0), given both maps of Net Radiation and soil Heat flux (Rn, g0) at instantaneous time, the surface roughness (z0m), a map of the altitude corrected temperature (t0dem), a point data of the frictional velocity (u*), a value of actual vapour pressure (ea[KPa]) and the (x,y) pairs for wet and dry pixels.
+
+Full process will need those:
+<ul>
+ <li>i.vi, i.albedo, i.latlong, i.emissivity
+ <li>i.evapo.potrad
+ <li>i.eb.netrad, i.eb.g0, i.eb.h_sebal01
+ <li>i.eb.evapfr, i.eb.eta
+</ul>
+
+(for time integration: i.evapo.time_integration)
+
+<p>For more details on the algorithms see [1][2][3].
+
+<H2>OPTIONS</H2>
+
+<H2>NOTES</H2>
+- z0m can be alculated by i.eb.z0m or i.eb.z0m0 (grass-addons).
+
+- ea can be calculated with standard meteorological data.
+ eoTmin=0.6108*EXP(17.27*Tmin/(Tmin+237.3))
+ eoTmax=0.6108*EXP(17.27*Tmax/(Tmax+237.3))
+ ea=(RH/100)/((eoTmin+eoTmax)/2)
+
+- t0dem = surface temperature + (altitude * 0.627 / 100)
+
+
+
+<H2>SEE ALSO</H2>
+<ul>
+ <li><a href=i.eb.g0.html>i.eb.g0</a>,
+ <a href=i.eb.h_SEBAL01.html>i.eb.h_SEBAL01</a>,
+ <a href=i.eb.evapfr.html>i.eb.evapfr</a></li>
+</ul>
+
+
+<H2>REFERENCES</H2>
+
+ <p>[1] Bastiaanssen, W.G.M., 1995.
+ Estimation of Land surface paramters by remote sensing under clear-sky conditions. PhD thesis, Wageningen University, Wageningen, The Netherlands.
+
+ <p>[2] Chemin Y., Alexandridis T.A., 2001. Improving spatial resolution of ET seasonal for irrigated rice in Zhanghe, China}''. Asian Journal of Geoinformatics. 5(1):3-11,2004.
+
+ <p>[3] Alexandridis T.K., Cherif I., Chemin Y., Silleos N.G., Stavrinos E., Zalidis G.C. Integrated methodology for estimating water use in Mediterranean agricultural areas. Remote Sensing. -(-):,2009. (submitted))
+
+
+<H2>AUTHORS</H2>
+ <p>
+ <i>
+ <br>Yann Chemin, International Rice Research Institute, Los Banos, The Philippines.
+ </i>
+ <p>Contact: <a href="mailto:yann.chemin at gmail.com"> Yann chemin</a>
+
+
+
+<p><i>Last changed: $Date: 2009/06/19 09:00:00 $</i>
+</body>
+</html>
Property changes on: grass/trunk/imagery/i.eb.h_SEBAL01/i.eb.h_SEBAL01.html
___________________________________________________________________
Name: svn:executable
+ *
Added: grass/trunk/imagery/i.eb.h_SEBAL01/main.c
===================================================================
--- grass/trunk/imagery/i.eb.h_SEBAL01/main.c (rev 0)
+++ grass/trunk/imagery/i.eb.h_SEBAL01/main.c 2009-06-19 12:48:44 UTC (rev 37958)
@@ -0,0 +1,651 @@
+
+/****************************************************************************
+ *
+ * MODULE: i.eb.h_SEBAL01
+ * AUTHOR(S): Yann Chemin - yann.chemin at gmail.com
+ * PURPOSE: Calculates sensible heat flux by SEBAL iteration
+ * Delta T will be reassessed in the iterations !
+ * This has been seen in Bastiaanssen (1995),
+ * later modified by Chemin and Alexandridis (2001).
+ * This code is implemented in Alexandridis et al. (2009).
+ *
+ * COPYRIGHT: (C) 2002-2009 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.
+ *
+ * CHANGELOG:
+ *
+ *****************************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <math.h>
+#include <grass/gis.h>
+#include <grass/glocale.h>
+
+#define PI 3.14159265358979
+
+double **G_alloc_matrix(int rows, int cols)
+{
+ double **m;
+
+ int i;
+
+ m = (double **)G_calloc(rows, sizeof(double *));
+ m[0] = (double *)G_calloc(rows * cols, sizeof(double));
+ for (i = 1; i < rows; i++)
+ m[i] = m[i - 1] + cols;
+
+ return m;
+}
+
+int main(int argc, char *argv[])
+{
+ struct Cell_head cellhd;
+ /* buffer for in, tmp and out raster */
+ void *inrast_Rn, *inrast_g0;
+ void *inrast_z0m, *inrast_t0dem;
+ DCELL *outrast;
+ int nrows, ncols;
+ int row, col;
+ int row_wet, col_wet;
+ int row_dry, col_dry;
+ double m_row_wet, m_col_wet;
+ double m_row_dry, m_col_dry;
+ int infd_Rn, infd_g0;
+ int infd_z0m, infd_t0dem;
+ int outfd;
+ char *Rn, *g0;
+ char *z0m, *t0dem;
+ char *h0;
+
+ double ustar, ea;
+ struct History history;
+ struct GModule *module;
+ struct Option *input_Rn, *input_g0;
+ struct Option *input_z0m, *input_t0dem, *input_ustar;
+ struct Option *input_ea, *output;
+ struct Option *input_row_wet, *input_col_wet;
+ struct Option *input_row_dry, *input_col_dry;
+ struct Flag *flag2, *flag3;
+ /********************************/
+ double xp, yp;
+ double xmin, ymin;
+ double xmax, ymax;
+ double stepx, stepy;
+ double latitude, longitude;
+ int rowDry, colDry, rowWet, colWet;
+ /********************************/
+ G_gisinit(argv[0]);
+
+ module = G_define_module();
+ module->description = _("Sensible Heat Flux iteration SEBAL 01");
+
+ /* Define different options */
+ input_Rn = G_define_standard_option(G_OPT_R_INPUT);
+ input_Rn->key = "Rn";
+ input_Rn->description =
+ _("Name of instantaneous Net Radiation map [W/m2]");
+
+ input_g0 = G_define_standard_option(G_OPT_R_INPUT);
+ input_g0->key = "g0";
+ input_g0->description =
+ _("Name of instantaneous soil heat flux map [W/m2]");
+
+ input_z0m = G_define_standard_option(G_OPT_R_INPUT);
+ input_z0m->key = "z0m";
+ input_z0m->description =
+ _("Name of aerodynamic resistance to heat momentum [s/m]");
+
+ input_t0dem = G_define_standard_option(G_OPT_R_INPUT);
+ input_t0dem->key = "t0dem";
+ input_t0dem->description =
+ _("Name of altitude corrected surface temperature [K]");
+
+ input_ustar = G_define_option();
+ input_ustar->key = "ustar";
+ input_ustar->type = TYPE_DOUBLE;
+ input_ustar->required = YES;
+ input_ustar->gisprompt = "old,value";
+ input_ustar->answer = "0.32407";
+ input_ustar->description = _("Value of the friction velocity [m/s]");
+ input_ustar->guisection = _("Parameters");
+
+ input_ea = G_define_option();
+ input_ea->key = "ea";
+ input_ea->type = TYPE_DOUBLE;
+ input_ea->required = YES;
+ input_ea->gisprompt = "old,value";
+ input_ea->answer = "1.511";
+ input_ea->description = _("Value of the actual vapour pressure [KPa]");
+ input_ea->guisection = _("Parameters");
+
+ input_row_wet = G_define_option();
+ input_row_wet->key = "row_wet";
+ input_row_wet->type = TYPE_DOUBLE;
+ input_row_wet->required = NO;
+ input_row_wet->gisprompt = "old,value";
+ input_row_wet->description = _("Row value of the wet pixel");
+ input_row_wet->guisection = _("Parameters");
+
+ input_col_wet = G_define_option();
+ input_col_wet->key = "col_wet";
+ input_col_wet->type = TYPE_DOUBLE;
+ input_col_wet->required = NO;
+ input_col_wet->gisprompt = "old,value";
+ input_col_wet->description = _("Column value of the wet pixel");
+ input_col_wet->guisection = _("Parameters");
+
+ input_row_dry = G_define_option();
+ input_row_dry->key = "row_dry";
+ input_row_dry->type = TYPE_DOUBLE;
+ input_row_dry->required = NO;
+ input_row_dry->gisprompt = "old,value";
+ input_row_dry->description = _("Row value of the dry pixel");
+ input_row_dry->guisection = _("Parameters");
+
+ input_col_dry = G_define_option();
+ input_col_dry->key = "col_dry";
+ input_col_dry->type = TYPE_DOUBLE;
+ input_col_dry->required = NO;
+ input_col_dry->gisprompt = "old,value";
+ input_col_dry->description = _("Column value of the dry pixel");
+ input_col_dry->guisection = _("Parameters");
+
+ output = G_define_standard_option(G_OPT_R_OUTPUT);
+ output->description = _("Name of output sensible heat flux layer [W/m2]");
+
+ /* Define the different flags */
+ flag2 = G_define_flag();
+ flag2->key = 'a';
+ flag2->description = _("Automatic wet/dry pixel (careful!)");
+
+ flag3 = G_define_flag();
+ flag3->key = 'c';
+ flag3->description =
+ _("Dry/Wet pixels coordinates are in image projection, not row/col");
+
+ if (G_parser(argc, argv))
+ exit(EXIT_FAILURE);
+
+ /* get entered parameters */
+ Rn = input_Rn->answer;
+ g0 = input_g0->answer;
+ z0m = input_z0m->answer;
+ t0dem = input_t0dem->answer;
+
+ h0 = output->answer;
+
+ ustar = atof(input_ustar->answer);
+ ea = atof(input_ea->answer);
+
+ m_row_wet = atof(input_row_wet->answer);
+ m_col_wet = atof(input_col_wet->answer);
+ m_row_dry = atof(input_row_dry->answer);
+ m_col_dry = atof(input_col_dry->answer);
+ if ((!input_row_wet->answer || !input_col_wet->answer ||
+ !input_row_dry->answer || !input_col_dry->answer) &&
+ !flag2->answer) {
+ G_fatal_error(_("FATAL ERROR: either auto-mode either wet/dry pixels coordinates should be provided!"));
+ }
+ if (flag3->answer) {
+ G_message(_("Manual wet/dry pixels in image coordinates"));
+ G_message(_("Wet Pixel=> x:%f y:%f"), m_col_wet, m_row_wet);
+ G_message(_("Dry Pixel=> x:%f y:%f"), m_col_dry, m_row_dry);
+ }
+ else {
+ G_message(_("Wet Pixel=> row:%.0f col:%.0f"), m_row_wet, m_col_wet);
+ G_message(_("Dry Pixel=> row:%.0f col:%.0f"), m_row_dry, m_col_dry);
+ }
+ /* check legal output name */
+ if (G_legal_filename(h0) < 0)
+ G_fatal_error(_("[%s] is an illegal name"), h0);
+
+ if ((infd_Rn = G_open_cell_old(Rn, "")) < 0)
+ G_fatal_error(_("Cannot open cell file [%s]"), Rn);
+ if ((infd_g0 = G_open_cell_old(g0, "")) < 0)
+ G_fatal_error(_("Cannot open cell file [%s]"), g0);
+ if ((infd_z0m = G_open_cell_old(z0m, "")) < 0)
+ G_fatal_error(_("Cannot open cell file [%s]"), z0m);
+ if ((infd_t0dem = G_open_cell_old(t0dem, "")) < 0)
+ G_fatal_error(_("Cannot open cell file [%s]"), t0dem);
+
+ if (G_get_cellhd(Rn, "", &cellhd) < 0)
+ G_fatal_error(_("Cannot read file header of [%s]"), Rn);
+ if (G_get_cellhd(g0, "", &cellhd) < 0)
+ G_fatal_error(_("Cannot read file header of [%s]"), g0);
+ if (G_get_cellhd(z0m, "", &cellhd) < 0)
+ G_fatal_error(_("Cannot read file header of [%s]"), z0m);
+ if (G_get_cellhd(t0dem, "", &cellhd) < 0)
+ G_fatal_error(_("Cannot read file header of [%s]"), t0dem);
+
+ /* Allocate input buffer */
+ inrast_Rn = G_allocate_d_raster_buf();
+ inrast_g0 = G_allocate_d_raster_buf();
+ inrast_z0m = G_allocate_d_raster_buf();
+ inrast_t0dem = G_allocate_d_raster_buf();
+
+ /***************************************************/
+ /* Setup pixel location variables */
+ /***************************************************/
+ stepx = cellhd.ew_res;
+ stepy = cellhd.ns_res;
+
+ xmin = cellhd.west;
+ xmax = cellhd.east;
+ ymin = cellhd.south;
+ ymax = cellhd.north;
+
+ nrows = G_window_rows();
+ ncols = G_window_cols();
+
+ /***************************************************/
+ /* Allocate output buffer */
+ /***************************************************/
+ outrast = G_allocate_d_raster_buf();
+
+ if ((outfd = G_open_raster_new(h0, DCELL_TYPE)) < 0)
+ G_fatal_error(_("Could not open <%s>"), h0);
+
+ /***************************************************/
+ /* Allocate memory for temporary images */
+ double **d_Roh, **d_Rah;
+
+ if ((d_Roh = G_alloc_matrix(nrows, ncols)) == NULL)
+ G_message("cannot allocate memory for temporary d_Roh image");
+ if ((d_Rah = G_alloc_matrix(nrows, ncols)) == NULL)
+ G_message("cannot allocate memory for temporary d_Rah image");
+ /***************************************************/
+
+ /* MANUAL T0DEM WET/DRY PIXELS */
+ DCELL d_Rn_dry;
+ DCELL d_g0_dry;
+ DCELL d_t0dem_dry;
+ DCELL d_t0dem_wet;
+
+ if (flag2->answer) {
+ /* Process tempk min / max pixels */
+ /* Internal use only */
+ DCELL d_Rn_wet;
+ DCELL d_g0_wet;
+ DCELL d_Rn;
+ DCELL d_g0;
+ DCELL d_h0;
+ DCELL t0dem_min;
+ DCELL t0dem_max;
+ /*********************/
+ for (row = 0; row < nrows; row++) {
+ DCELL d_t0dem;
+ G_percent(row, nrows, 2);
+ if (G_get_d_raster_row(infd_t0dem,inrast_t0dem,row)<0)
+ G_fatal_error(_("Could not read from <%s>"),t0dem);
+ if (G_get_d_raster_row(infd_Rn,inrast_Rn,row)<0)
+ G_fatal_error(_("Could not read from <%s>"),Rn);
+ if (G_get_d_raster_row(infd_g0,inrast_g0,row)<0)
+ G_fatal_error(_("Could not read from <%s>"),g0);
+ /*process the data */
+ for (col = 0; col < ncols; col++) {
+ d_t0dem = ((DCELL *) inrast_t0dem)[col];
+ d_Rn = ((DCELL *) inrast_Rn)[col];
+ d_g0 = ((DCELL *) inrast_g0)[col];
+ if (G_is_d_null_value(&d_t0dem) ||
+ G_is_d_null_value(&d_Rn) ||
+ G_is_d_null_value(&d_g0)) {
+ /* do nothing */
+ }
+ else {
+ if (d_t0dem <= 250.0) {
+ /* do nothing */
+ }
+ else {
+ d_h0 = d_Rn - d_g0;
+ if (d_t0dem < t0dem_min &&
+ d_Rn > 0.0 && d_g0 > 0.0 && d_h0 > 0.0 &&
+ d_h0 < 100.0) {
+ t0dem_min = d_t0dem;
+ d_t0dem_wet = d_t0dem;
+ d_Rn_wet = d_Rn;
+ d_g0_wet = d_g0;
+ m_col_wet = col;
+ m_row_wet = row;
+ }
+ if (d_t0dem > t0dem_max &&
+ d_Rn > 0.0 && d_g0 > 0.0 && d_h0 > 100.0 &&
+ d_h0 < 500.0) {
+ t0dem_max = d_t0dem;
+ d_t0dem_dry = d_t0dem;
+ d_Rn_dry = d_Rn;
+ d_g0_dry = d_g0;
+ m_col_dry = col;
+ m_row_dry = row;
+ }
+ }
+ }
+ }
+ }
+ G_message("row_wet=%d\tcol_wet=%d\n", row_wet, col_wet);
+ G_message("row_dry=%d\tcol_dry=%d\n", row_dry, col_dry);
+ G_message("g0_wet=%f\n", d_g0_wet);
+ G_message("Rn_wet=%f\n", d_Rn_wet);
+ G_message("LE_wet=%f\n", d_Rn_wet - d_g0_wet);
+ G_message("t0dem_dry=%f\n", d_t0dem_dry);
+ G_message("rnet_dry=%f\n", d_Rn_dry);
+ G_message("g0_dry=%f\n", d_g0_dry);
+ G_message("h0_dry=%f\n", d_Rn_dry - d_g0_dry);
+ }/* END OF FLAG2 */
+
+
+ /* MANUAL T0DEM WET/DRY PIXELS */
+ /*DRY PIXEL */
+ if (flag3->answer) {
+ /*Calculate coordinates of row/col from projected ones */
+ row = (int)((ymax - m_row_dry) / (double)stepy);
+ col = (int)((m_col_dry - xmin) / (double)stepx);
+ G_message("Dry Pixel | row:%i col:%i", row, col);
+ }
+ else {
+ row = (int)m_row_dry;
+ col = (int)m_col_dry;
+ G_message("Dry Pixel | row:%i col:%i", row, col);
+ }
+ rowDry = row;
+ colDry = col;
+ if (G_get_d_raster_row(infd_Rn, inrast_Rn, row) < 0)
+ G_fatal_error(_("Could not read from <%s>"), Rn);
+ if (G_get_d_raster_row(infd_g0, inrast_g0, row) < 0)
+ G_fatal_error(_("Could not read from <%s>"), g0);
+ if (G_get_d_raster_row(infd_t0dem, inrast_t0dem, row) < 0)
+ G_fatal_error(_("Could not read from <%s>"), t0dem);
+ d_Rn_dry = ((DCELL *) inrast_Rn)[col];
+ d_g0_dry = ((DCELL *) inrast_g0)[col];
+ d_t0dem_dry = ((DCELL *) inrast_t0dem)[col];
+ /*WET PIXEL */
+ if (flag3->answer) {
+ /*Calculate coordinates of row/col from projected ones */
+ row = (int)((ymax - m_row_wet) / (double)stepy);
+ col = (int)((m_col_wet - xmin) / (double)stepx);
+ G_message("Wet Pixel | row:%i col:%i", row, col);
+ }
+ else {
+ row = m_row_wet;
+ col = m_col_wet;
+ G_message("Wet Pixel | row:%i col:%i", row, col);
+ }
+ rowWet = row;
+ colWet = col;
+ if (G_get_d_raster_row(infd_t0dem, inrast_t0dem, row) < 0)
+ G_fatal_error(_("Could not read from <%s>"), t0dem);
+ d_t0dem_wet = ((DCELL *) inrast_t0dem)[col];
+ /* END OF MANUAL WET/DRY PIXELS */
+ double h_dry;
+
+ h_dry = d_Rn_dry - d_g0_dry;
+ G_message("h_dry = %f", h_dry);
+ G_message("t0dem_dry = %f", d_t0dem_dry);
+ G_message("t0dem_wet = %f", d_t0dem_wet);
+ DCELL d_rah_dry;
+ DCELL d_roh_dry;
+
+ /* INITIALIZATION */
+ for (row = 0; row < nrows; row++) {
+ DCELL d_t0dem;
+ DCELL d_z0m;
+ DCELL d_rah1;
+ DCELL d_roh1;
+ DCELL d_u5;
+ G_percent(row, nrows, 2);
+ /* read a line input maps into buffers */
+ if (G_get_d_raster_row(infd_z0m, inrast_z0m, row) < 0)
+ G_fatal_error(_("Could not read from <%s>"), z0m);
+ if (G_get_d_raster_row(infd_t0dem, inrast_t0dem,row)<0)
+ G_fatal_error(_("Could not read from <%s>"), t0dem);
+ /* read every cell in the line buffers */
+ for (col = 0; col < ncols; col++) {
+ d_z0m = ((DCELL *) inrast_z0m)[col];
+ d_t0dem = ((DCELL *) inrast_t0dem)[col];
+ if (G_is_d_null_value(&d_t0dem) || G_is_d_null_value(&d_z0m)) {
+ /* do nothing */
+ d_Roh[row][col] = -999.9;
+ d_Rah[row][col] = -999.9;
+ }
+ else {
+ d_u5 = (ustar / 0.41) * log(5 / d_z0m);
+ d_rah1=(1/(d_u5*pow(0.41,2)))*log(5/d_z0m)*log(5/(d_z0m*0.1));
+ d_roh1=((998-ea)/(d_t0dem*2.87))+(ea/(d_t0dem*4.61));
+ if (d_roh1 > 5) d_roh1 = 1.0;
+ else d_roh1=((1000-4.65)/(d_t0dem*2.87))+(4.65/(d_t0dem*4.61));
+ if (row == rowDry && col == colDry) { /*collect dry pix info */
+ d_rah_dry = d_rah1;
+ d_roh_dry = d_roh1;
+ G_message("d_rah_dry=%f d_roh_dry=%f",d_rah_dry,d_roh_dry);
+ }
+ d_Roh[row][col] = d_roh1;
+ d_Rah[row][col] = d_rah1;
+ }
+ }
+ }
+ DCELL d_dT_dry;
+
+ /*Calculate dT_dry */
+ d_dT_dry = (h_dry * d_rah_dry) / (1004 * d_roh_dry);
+ double a, b;
+
+ /*Calculate coefficients for next dT equation */
+ /*a = 1.0/ ((d_dT_dry-0.0) / (d_t0dem_dry-d_t0dem_wet)); */
+ /*b = ( a * d_t0dem_wet ) * (-1.0); */
+ double sumx = d_t0dem_wet + d_t0dem_dry;
+ double sumy = d_dT_dry + 0.0;
+ double sumx2 = pow(d_t0dem_wet, 2) + pow(d_t0dem_dry, 2);
+ double sumxy = (d_t0dem_wet * 0.0) + (d_t0dem_dry * d_dT_dry);
+ a = (sumxy - ((sumx * sumy) / 2.0)) / (sumx2 - (pow(sumx, 2) / 2.0));
+ b = (sumy - (a * sumx)) / 2.0;
+ G_message("d_dT_dry=%f", d_dT_dry);
+ G_message("dT1=%f * t0dem + (%f)", a, b);
+ DCELL d_h_dry;
+
+ /* ITERATION 1 */
+ for (row = 0; row < nrows; row++) {
+ DCELL d_t0dem;
+ DCELL d_z0m;
+ DCELL d_h1;
+ DCELL d_rah1;
+ DCELL d_rah2;
+ DCELL d_roh1;
+ DCELL d_L;
+ DCELL d_x;
+ DCELL d_psih;
+ DCELL d_psim;
+ DCELL d_u5;
+ G_percent(row, nrows, 2);
+ /* read a line input maps into buffers */
+ if (G_get_d_raster_row(infd_z0m, inrast_z0m, row) < 0)
+ G_fatal_error(_("Could not read from <%s>"), z0m);
+ if (G_get_d_raster_row(infd_t0dem, inrast_t0dem,row)<0)
+ G_fatal_error(_("Could not read from <%s>"), t0dem);
+ /* read every cell in the line buffers */
+ for (col = 0; col < ncols; col++) {
+ d_z0m = ((DCELL *) inrast_z0m)[col];
+ d_t0dem = ((DCELL *) inrast_t0dem)[col];
+ d_rah1 = d_Rah[row][col];
+ d_roh1 = d_Roh[row][col];
+ if (G_is_d_null_value(&d_t0dem) || G_is_d_null_value(&d_z0m)) {
+ /* do nothing */
+ }
+ else {
+ if (d_rah1 < 1.0) {
+ d_h1 = 0.0;
+ }
+ else {
+ d_h1 = (1004 * d_roh1) * (a * d_t0dem + b) / d_rah1;
+ }
+ d_L =-1004*d_roh1*pow(ustar,3)*d_t0dem/(d_h1*9.81*0.41);
+ d_x = pow((1-16*(5/d_L)),0.25);
+ d_psim =2*log((1+d_x)/2)+log((1+pow(d_x,2))/2)-2*atan(d_x)+0.5*PI;
+ d_psih =2*log((1+pow(d_x,2))/2);
+ d_u5 =(ustar/0.41)*log(5/d_z0m);
+ d_rah2 = (1/(d_u5*pow(0.41,2)))*log((5/d_z0m)-d_psim)
+ *log((5/(d_z0m*0.1))-d_psih);
+ if (row == rowDry && col == colDry) {/*collect dry pix info */
+ d_rah_dry = d_rah2;
+ d_h_dry = d_h1;
+ }
+ d_Rah[row][col] = d_rah1;
+ }
+ }
+ }
+
+ /*Calculate dT_dry */
+ d_dT_dry = (d_h_dry * d_rah_dry) / (1004 * d_roh_dry);
+ /*Calculate coefficients for next dT equation */
+ /* a = (d_dT_dry-0)/(d_t0dem_dry-d_t0dem_wet); */
+ /* b = (-1.0) * ( a * d_t0dem_wet ); */
+ /* G_message("d_dT_dry=%f",d_dT_dry); */
+ /* G_message("dT2=%f * t0dem + (%f)", a, b); */
+ sumx = d_t0dem_wet + d_t0dem_dry;
+ sumy = d_dT_dry + 0.0;
+ sumx2 = pow(d_t0dem_wet, 2) + pow(d_t0dem_dry, 2);
+ sumxy = (d_t0dem_wet * 0.0) + (d_t0dem_dry * d_dT_dry);
+ a = (sumxy - ((sumx * sumy) / 2.0)) / (sumx2 - (pow(sumx, 2) / 2.0));
+ b = (sumy - (a * sumx)) / 2.0;
+ G_message("d_dT_dry=%f", d_dT_dry);
+ G_message("dT1=%f * t0dem + (%f)", a, b);
+
+ /* ITERATION 2 */
+ /***************************************************/
+ /***************************************************/
+ for (row = 0; row < nrows; row++) {
+ DCELL d_t0dem;
+ DCELL d_z0m;
+ DCELL d_rah2;
+ DCELL d_rah3;
+ DCELL d_roh1;
+ DCELL d_h2;
+ DCELL d_L;
+ DCELL d_x;
+ DCELL d_psih;
+ DCELL d_psim;
+ DCELL d_u5;
+ G_percent(row, nrows, 2);
+ /* read a line input maps into buffers */
+ if (G_get_d_raster_row(infd_z0m,inrast_z0m,row)<0)
+ G_fatal_error(_("Could not read from <%s>"), z0m);
+ if (G_get_d_raster_row(infd_t0dem,inrast_t0dem,row)<0)
+ G_fatal_error(_("Could not read from <%s>"), t0dem);
+ /* read every cell in the line buffers */
+ for (col = 0; col < ncols; col++) {
+ d_z0m = ((DCELL *) inrast_z0m)[col];
+ d_t0dem = ((DCELL *) inrast_t0dem)[col];
+ d_rah2 = d_Rah[row][col];
+ d_roh1 = d_Roh[row][col];
+ if (G_is_d_null_value(&d_t0dem) || G_is_d_null_value(&d_z0m)) {
+ /* do nothing */
+ }
+ else {
+ if (d_rah2 < 1.0) {
+ d_h2 = 0.0;
+ }
+ else {
+ d_h2 =(1004*d_roh1)*(a*d_t0dem+b)/d_rah2;
+ }
+ d_L =-1004*d_roh1*pow(ustar,3)*d_t0dem/(d_h2*9.81*0.41);
+ d_x = pow((1 - 16 * (5 / d_L)), 0.25);
+ d_psim =2*log((1+d_x)/2)+log((1+pow(d_x,2))/2)-
+ 2*atan(d_x)+0.5*PI;
+ d_psih =2*log((1+pow(d_x,2))/2);
+ d_u5 =(ustar/0.41)*log(5/d_z0m);
+ d_rah3=(1/(d_u5*pow(0.41,2)))*log((5/d_z0m)-d_psim)*
+ log((5/(d_z0m*0.1))-d_psih);
+ if (row == rowDry && col == colDry) {/*collect dry pix info */
+ d_rah_dry = d_rah2;
+ d_h_dry = d_h2;
+ }
+ d_Rah[row][col] = d_rah2;
+ }
+ }
+ }
+
+ /*Calculate dT_dry */
+ d_dT_dry = (d_h_dry * d_rah_dry) / (1004 * d_roh_dry);
+ /*Calculate coefficients for next dT equation */
+ /* a = (d_dT_dry-0)/(d_t0dem_dry-d_t0dem_wet); */
+ /* b = (-1.0) * ( a * d_t0dem_wet ); */
+ /* G_message("d_dT_dry=%f",d_dT_dry); */
+ /* G_message("dT3=%f * t0dem + (%f)", a, b); */
+ sumx = d_t0dem_wet + d_t0dem_dry;
+ sumy = d_dT_dry + 0.0;
+ sumx2 = pow(d_t0dem_wet, 2) + pow(d_t0dem_dry, 2);
+ sumxy = (d_t0dem_wet * 0.0) + (d_t0dem_dry * d_dT_dry);
+ a = (sumxy - ((sumx * sumy) / 2.0)) / (sumx2 - (pow(sumx, 2) / 2.0));
+ b = (sumy - (a * sumx)) / 2.0;
+ G_message("d_dT_dry=%f", d_dT_dry);
+ G_message("dT1=%f * t0dem + (%f)", a, b);
+
+ /* ITERATION 3 */
+ /***************************************************/
+ /***************************************************/
+
+ for (row = 0; row < nrows; row++) {
+ DCELL d_t0dem;
+ DCELL d_z0m;
+ DCELL d_rah3;
+ DCELL d_roh1;
+ DCELL d_h3;
+ DCELL d_L;
+ DCELL d_x;
+ DCELL d_psih;
+ DCELL d_psim;
+ DCELL d; /* Output pixel */
+ G_percent(row, nrows, 2);
+ /* read a line input maps into buffers */
+ if (G_get_d_raster_row(infd_z0m, inrast_z0m, row) < 0)
+ G_fatal_error(_("Could not read from <%s>"), z0m);
+ if (G_get_d_raster_row(infd_t0dem,inrast_t0dem,row)<0)
+ G_fatal_error(_("Could not read from <%s>"), t0dem);
+ /* read every cell in the line buffers */
+ for (col = 0; col < ncols; col++) {
+ d_z0m = ((DCELL *) inrast_z0m)[col];
+ d_t0dem = ((DCELL *) inrast_t0dem)[col];
+ d_rah3 = d_Rah[row][col];
+ d_roh1 = d_Roh[row][col];
+ if (G_is_d_null_value(&d_t0dem) || G_is_d_null_value(&d_z0m)) {
+ G_set_d_null_value(&outrast[col], 1);
+ }
+ else {
+ if (d_rah3 < 1.0) {
+ d_h3 = 0.0;
+ }
+ else {
+ d_h3 = (1004 * d_roh1) * (a * d_t0dem + b) / d_rah3;
+ }
+ if (d_h3 < 0 && d_h3 > -50) {
+ d_h3 = 0.0;
+ }
+ if (d_h3 < -50 || d_h3 > 1000) {
+ G_set_d_null_value(&outrast[col], 1);
+ }
+ outrast[col] = d_h3;
+ }
+ }
+ if (G_put_d_raster_row(outfd, outrast) < 0)
+ G_fatal_error("Cannot write to output file <%s>", h0);
+ }
+
+
+ G_free(inrast_z0m);
+ G_close_cell(infd_z0m);
+ G_free(inrast_t0dem);
+ G_close_cell(infd_t0dem);
+
+ G_free(outrast);
+ G_close_cell(outfd);
+
+ /* add command line incantation to history file */
+ G_short_history(h0, "raster", &history);
+ G_command_history(&history);
+ G_write_history(h0, &history);
+
+ exit(EXIT_SUCCESS);
+}
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