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/******************************************************************************
* Project: PROJ.4
* Purpose: Apply vertical datum shifts based on grid shift files, normally
* geoid grids mapping WGS84 to NAVD88 or something similar.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2010, Frank Warmerdam <warmerdam@pobox.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#ifndef FROM_PROJ_CPP
#define FROM_PROJ_CPP
#endif
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "proj_internal.h"
#include "proj/internal/internal.hpp"
#include "grids.hpp"
NS_PROJ_START
static double read_vgrid_value(const ListOfVGrids& grids, PJ_LP input, double vmultiplier) {
/* do not deal with NaN coordinates */
/* cppcheck-suppress duplicateExpression */
if( isnan(input.phi) || isnan(input.lam) )
{
return HUGE_VAL;
}
const VerticalShiftGrid* grid = nullptr;
for( const auto& gridset: grids )
{
grid = gridset->gridAt(input.lam, input.phi);
if( grid )
break;
}
if( !grid )
{
return HUGE_VAL;
}
const auto& extent = grid->extentAndRes();
/* Interpolation a location within the grid */
double grid_x = (input.lam - extent.westLon) / extent.resLon;
if( extent.fullWorldLongitude() ) {
// The first fmod goes to ]-lim, lim[ range
// So we add lim again to be in ]0, 2*lim[ and fmod again
grid_x = fmod(
fmod(grid_x + grid->width(), grid->width()) + grid->width(),
grid->width());
}
double grid_y = (input.phi - extent.southLat) / extent.resLat;
int grid_ix = static_cast<int>(lround(floor(grid_x)));
assert(grid_ix >= 0 && grid_ix < grid->width());
int grid_iy = static_cast<int>(lround(floor(grid_y)));
assert(grid_iy >= 0 && grid_iy < grid->height());
grid_x -= grid_ix;
grid_y -= grid_iy;
int grid_ix2 = grid_ix + 1;
if( grid_ix2 >= grid->width() ) {
if( extent.fullWorldLongitude() ) {
grid_ix2 = 0;
} else {
grid_ix2 = grid->width() - 1;
}
}
int grid_iy2 = grid_iy + 1;
if( grid_iy2 >= grid->height() )
grid_iy2 = grid->height() - 1;
float value_a = 0;
float value_b = 0;
float value_c = 0;
float value_d = 0;
if( !grid->valueAt(grid_ix, grid_iy, value_a) ||
!grid->valueAt(grid_ix2, grid_iy, value_b) ||
!grid->valueAt(grid_ix, grid_iy2, value_c) ||
!grid->valueAt(grid_ix2, grid_iy2, value_d) )
{
return HUGE_VAL;
}
double total_weight = 0.0;
int n_weights = 0;
double value = 0.0f;
if( !grid->isNodata(value_a, vmultiplier) )
{
double weight = (1.0-grid_x) * (1.0-grid_y);
value += value_a * weight;
total_weight += weight;
n_weights ++;
}
if( !grid->isNodata(value_b, vmultiplier) )
{
double weight = (grid_x) * (1.0-grid_y);
value += value_b * weight;
total_weight += weight;
n_weights ++;
}
if( !grid->isNodata(value_c, vmultiplier) )
{
double weight = (1.0-grid_x) * (grid_y);
value += value_c * weight;
total_weight += weight;
n_weights ++;
}
if( !grid->isNodata(value_d, vmultiplier) )
{
double weight = (grid_x) * (grid_y);
value += value_d * weight;
total_weight += weight;
n_weights ++;
}
if( n_weights == 0 )
value = HUGE_VAL;
else if( n_weights != 4 )
value /= total_weight;
return value * vmultiplier;
}
/**********************************************/
ListOfVGrids proj_vgrid_init(PJ* P, const char *gridkey) {
/**********************************************
Initizalize and populate gridlist.
Takes a PJ-object and the plus-parameter
name that is used in the proj-string to
specify the grids to load, e.g. "+grids".
The + should be left out here.
Returns the number of loaded grids.
***********************************************/
std::string key("s");
key += gridkey;
const char* gridnames = pj_param(P->ctx, P->params, key.c_str()).s;
if( gridnames == nullptr )
return {};
auto listOfGridNames = internal::split(std::string(gridnames), ',');
ListOfVGrids grids;
for( const auto& gridnameStr: listOfGridNames )
{
const char* gridname = gridnameStr.c_str();
bool canFail = false;
if( gridname[0] == '@' )
{
canFail = true;
gridname ++;
}
auto gridSet = VerticalShiftGridSet::open(P->ctx, gridname);
if( !gridSet )
{
if( !canFail )
{
pj_ctx_set_errno( P->ctx, PJD_ERR_FAILED_TO_LOAD_GRID );
return {};
}
}
else
{
grids.emplace_back(std::move(gridSet));
}
}
return grids;
}
/***********************************************/
double proj_vgrid_value(PJ *P, const ListOfVGrids& grids, PJ_LP lp, double vmultiplier){
/***********************************************
Read grid value at position lp in grids loaded
with proj_grid_init.
Returns the grid value of the given coordinate.
************************************************/
double value;
value = read_vgrid_value(grids, lp, vmultiplier);
proj_log_trace(P, "proj_vgrid_value: (%f, %f) = %f", lp.lam*RAD_TO_DEG, lp.phi*RAD_TO_DEG, value);
return value;
}
NS_PROJ_END
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