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GeoReference.cc
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// __BEGIN_LICENSE__
// Copyright (c) 2006-2012, United States Government as represented by the
// Administrator of the National Aeronautics and Space Administration. All
// rights reserved.
//
// The NASA Vision Workbench is licensed under the Apache License,
// Version 2.0 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// __END_LICENSE__
#include <vw/Cartography/GeoReference.h>
#if defined(VW_HAVE_PKG_GDAL) && VW_HAVE_PKG_GDAL
#include <vw/Cartography/GeoReferenceResourceGDAL.h>
#include <vw/FileIO/DiskImageResourceGDAL.h>
#include "ogr_spatialref.h"
#include "cpl_string.h"
#endif
#include <vw/Cartography/GeoReferenceResourcePDS.h>
#include <vw/FileIO/DiskImageResourcePDS.h>
// Boost
#include <boost/algorithm/string.hpp>
#include <boost/foreach.hpp>
// Proj.4
#include <proj_api.h>
// Macro for checking Proj.4 output, something we do a lot of.
#define CHECK_PROJ_ERROR(ctx_input) if(ctx_input.error_no()) vw_throw(ProjectionErr() << "Proj.4 error: " << pj_strerrno(ctx_input.error_no()))
namespace vw {
namespace cartography {
bool read_georeference( GeoReference& georef,
ImageResource const& resource ) {
#if defined(VW_HAVE_PKG_GDAL) && VW_HAVE_PKG_GDAL==1
DiskImageResourceGDAL const* gdal =
dynamic_cast<DiskImageResourceGDAL const*>( &resource );
if( gdal ) return read_gdal_georeference( georef, *gdal );
#endif
DiskImageResourcePDS const* pds =
dynamic_cast<DiskImageResourcePDS const*>( &resource );
if( pds ) return read_pds_georeference( georef, *pds );
return false;
}
void write_georeference( ImageResource& resource,
GeoReference const& georef ) {
#if defined(VW_HAVE_PKG_GDAL) && VW_HAVE_PKG_GDAL==1
DiskImageResourceGDAL* gdal =
dynamic_cast<DiskImageResourceGDAL*>( &resource );
if ( gdal ) return write_gdal_georeference( *gdal, georef );
#endif
// DiskImageResourcePDS is currently read-only, so we don't bother
// checking for it.
vw_throw(NoImplErr() << "This image resource does not support writing georeferencing information.");
}
std::string GeoReference::proj4_str() const {
return m_proj_projection_str;
}
std::string GeoReference::overall_proj4_str() const {
std::string proj4_str =
m_proj_projection_str + " " + m_datum.proj4_str() + " +no_defs";
return proj4_str;
}
void GeoReference::init_proj() {
m_proj_context =
ProjContext( overall_proj4_str() );
}
/// Construct a default georeference. This georeference will use
/// the identity matrix as the initial transformation matrix, and
/// select the default datum (WGS84) and projection (geographic).
GeoReference::GeoReference() {
set_transform(vw::math::identity_matrix<3>());
set_geographic();
init_proj();
}
/// Takes a geodetic datum. The affine transform defaults to the
/// identity matrix.
GeoReference::GeoReference(Datum const& datum) : GeoReferenceBase(datum){
set_transform(vw::math::identity_matrix<3>());
set_geographic();
init_proj();
}
/// Takes a geodetic datum and an affine transformation matrix
GeoReference::GeoReference(Datum const& datum,
Matrix<double,3,3> const& transform) : GeoReferenceBase(datum) {
set_transform(transform);
set_geographic();
init_proj();
}
GeoReference::GeoReference(Datum const& datum,
Matrix<double,3,3> const& transform,
PixelInterpretation pixel_interpretation) :
GeoReferenceBase(datum, pixel_interpretation) {
set_transform(transform);
set_geographic();
init_proj();
}
#if defined(VW_HAVE_PKG_PROTOBUF) && VW_HAVE_PKG_PROTOBUF==1
GeoReference::GeoReference(GeoReferenceDesc const& desc) {
VW_ASSERT(desc.transform_size() == 9,
IOErr() << "GeoReference::GeoReference: Unexpected number of elements in transform");
m_datum = Datum(desc.datum());
m_pixel_interpretation =
static_cast<GeoReferenceBase::PixelInterpretation>(desc.pixel_interpretation());
set_transform(Matrix3x3(desc.transform().data()));
m_is_projected = desc.is_projected();
m_proj_projection_str = desc.proj_projection_str();
init_proj();
}
GeoReferenceDesc GeoReference::build_desc() {
GeoReferenceDesc desc;
*(desc.mutable_datum()) = m_datum.build_desc();
desc.set_pixel_interpretation(static_cast<GeoReferenceDesc::PixelInterpretation>(m_pixel_interpretation));
std::copy(m_transform.begin(), m_transform.end(), RepeatedFieldBackInserter(desc.mutable_transform()));
desc.set_is_projected(m_is_projected);
desc.set_proj_projection_str(m_proj_projection_str);
return desc;
}
#endif
void GeoReference::set_transform(Matrix3x3 transform) {
m_transform = transform;
m_shifted_transform = m_transform;
m_shifted_transform(0,2) += 0.5*m_transform(0,0);
m_shifted_transform(1,2) += 0.5*m_transform(1,1);
m_inv_transform = vw::math::inverse(m_transform);
m_inv_shifted_transform = vw::math::inverse(m_shifted_transform);
}
// We override the base classes method here so that we have the
// opportunity to call init_proj()
void GeoReference::set_datum(Datum const& datum) {
m_datum = datum;
init_proj();
}
// Adjust the affine transform to the VW convention ( [0,0] is at
// the center of upper left pixel) if file is georeferenced
// according to the convention that [0,0] is the upper left hand
// corner of the upper left pixel.
inline Matrix3x3 const& GeoReference::vw_native_transform() const {
if (m_pixel_interpretation == GeoReference::PixelAsArea)
return m_shifted_transform;
else
return m_transform;
}
inline Matrix3x3 const& GeoReference::vw_native_inverse_transform() const {
if (m_pixel_interpretation == GeoReference::PixelAsArea)
return m_inv_shifted_transform;
else
return m_inv_transform;
}
void GeoReference::set_well_known_geogcs(std::string name) {
m_datum.set_well_known_datum(name);
init_proj();
}
void GeoReference::set_geographic() {
m_is_projected = false;
m_proj_projection_str = "+proj=longlat";
init_proj();
}
void GeoReference::set_equirectangular(double center_latitude, double center_longitude, double latitude_of_true_scale, double false_easting, double false_northing) {
std::ostringstream strm;
strm << "+proj=eqc +lon_0=" << center_longitude << " +lat_0="
<< center_latitude << " +lat_ts=" << latitude_of_true_scale
<< " +x_0=" << false_easting << " +y_0=" << false_northing
<< " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_sinusoidal(double center_longitude, double false_easting, double false_northing) {
std::ostringstream strm;
strm << "+proj=sinu +lon_0=" << center_longitude << " +x_0="
<< false_easting << " +y_0=" << false_northing << " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_mercator(double center_latitude, double center_longitude, double latitude_of_true_scale, double false_easting, double false_northing) {
std::ostringstream strm;
strm << "+proj=merc +lon_0=" << center_longitude << " +lat_0="
<< center_latitude << " +lat_ts=" << latitude_of_true_scale
<< " +x_0=" << false_easting << " +y_0=" << false_northing
<< " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_transverse_mercator(double center_latitude, double center_longitude, double scale, double false_easting, double false_northing) {
std::ostringstream strm;
strm << "+proj=tmerc +lon_0=" << center_longitude << " +lat_0="
<< center_latitude << " +k=" << scale << " +x_0=" << false_easting
<< " +y_0=" << false_northing << " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_orthographic(double center_latitude, double center_longitude, double false_easting, double false_northing) {
std::ostringstream strm;
strm << "+proj=ortho +lon_0=" << center_longitude << " +lat_0="
<< center_latitude << " +x_0=" << false_easting << " +y_0="
<< false_northing << " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_oblique_stereographic(double center_latitude, double center_longitude, double scale, double false_easting, double false_northing) {
std::ostringstream strm;
strm << "+proj=sterea +lon_0=" << center_longitude << " +lat_0="
<< center_latitude << " +k=" << scale << " +x_0=" << false_easting
<< " +y_0=" << false_northing << " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_stereographic(double center_latitude, double center_longitude, double scale, double false_easting, double false_northing) {
std::ostringstream strm;
strm << "+proj=stere +lon_0=" << center_longitude << " +lat_0="
<< center_latitude << " +k=" << scale << " +x_0=" << false_easting
<< " +y_0=" << false_northing << " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_lambert_azimuthal(double center_latitude, double center_longitude, double false_easting, double false_northing) {
std::ostringstream strm;
strm << "+proj=laea +lon_0=" << center_longitude << " +lat_0="
<< center_latitude << " +x_0=" << false_easting << " +y_0="
<< false_northing << " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_lambert_conformal(double std_parallel_1, double std_parallel_2, double center_latitude, double center_longitude, double false_easting, double false_northing) {
std::ostringstream strm;
strm << "+proj=lcc +lat_1=" << std_parallel_1 << " +lat_2="
<< std_parallel_2 << " +lon_0=" << center_longitude << " +lat_0="
<< center_latitude << " +x_0=" << false_easting << " +y_0="
<< false_northing << " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_UTM(int zone, int north) {
std::ostringstream strm;
strm << "+proj=utm +zone=" << zone;
if (!north) strm << " +south";
strm << " +units=m";
m_proj_projection_str = strm.str();
m_is_projected = true;
init_proj();
}
void GeoReference::set_proj4_projection_str(std::string const& s) {
m_proj_projection_str = s;
if (s.find("+proj=longlat") == 0)
m_is_projected = false;
else
m_is_projected = true;
init_proj();
}
#if defined(VW_HAVE_PKG_GDAL) && VW_HAVE_PKG_GDAL
void GeoReference::set_wkt(std::string const& wkt) {
const char *wkt_str = wkt.c_str();
char **wkt_ptr = (char**)(&wkt_str);
OGRSpatialReference gdal_spatial_ref;
gdal_spatial_ref.importFromWkt(wkt_ptr);
// Read projection information out of the file
char* proj_str_tmp;
gdal_spatial_ref.exportToProj4(&proj_str_tmp);
std::string proj4_str = proj_str_tmp;
CPLFree( proj_str_tmp );
std::vector<std::string> input_strings, output_strings, datum_strings;
std::string trimmed_proj4_str = boost::trim_copy(proj4_str);
boost::split( input_strings, trimmed_proj4_str, boost::is_any_of(" ") );
for (size_t i = 0; i < input_strings.size(); ++i) {
const std::string& key = input_strings[i];
// Pick out the parts of the projection string that pertain to
// map projections. We essentially want to eliminate all of
// the strings that have to do with the datum, since those are
// handled by interacting directly with the
// OGRSpatialReference below. This is sort of messy, but it's
// the easiest way to do this, as far as I can tell.
if (key == "+k=0") {
vw_out(WarningMessage) << "Input contained an illegal scale_factor of zero. Ignored." << std::endl;
} else if ((key.find("+proj=") == 0) ||
(key.find("+x_0=") == 0) ||
(key.find("+y_0=") == 0) ||
(key.find("+lon") == 0) ||
(key.find("+lat") == 0) ||
(key.find("+k=") == 0) ||
(key.find("+lat_ts=") == 0) ||
(key.find("+ns") == 0) ||
(key.find("+no_cut") == 0) ||
(key.find("+h=") == 0) ||
(key.find("+W=") == 0) ||
(key.find("+units=") == 0) ||
(key.find("+zone=") == 0)) {
output_strings.push_back(key);
} else if ((key.find("+ellps=") == 0) ||
(key.find("+datum=") == 0)) {
// We put these in the proj4_str for the Datum class.
datum_strings.push_back(key);
}
}
std::ostringstream strm;
BOOST_FOREACH( std::string const& element, output_strings )
strm << element << " ";
// If the file contains no projection related information, we
// supply proj.4 with a "default" interpretation that the file
// is in geographic (unprojected) coordinates.
if (output_strings.empty())
set_proj4_projection_str("+proj=longlat");
else
set_proj4_projection_str(strm.str());
int utm_north = 0;
int utm_zone = gdal_spatial_ref.GetUTMZone(&utm_north);
if (utm_zone)
set_UTM(utm_zone, utm_north);
// Read in the datum information
Datum datum;
const char* datum_name = gdal_spatial_ref.GetAttrValue("DATUM");
if (datum_name) { datum.name() = datum_name; }
const char* spheroid_name = gdal_spatial_ref.GetAttrValue("SPHEROID");
if (spheroid_name) { datum.spheroid_name() = spheroid_name; }
const char* meridian_name = gdal_spatial_ref.GetAttrValue("PRIMEM");
if (meridian_name) { datum.meridian_name() = meridian_name; }
OGRErr e1, e2;
double semi_major = gdal_spatial_ref.GetSemiMajor(&e1);
double semi_minor = gdal_spatial_ref.GetSemiMinor(&e2);
if (e1 != OGRERR_FAILURE && e2 != OGRERR_FAILURE) {
datum.set_semi_major_axis(semi_major);
datum.set_semi_minor_axis(semi_minor);
}
datum.meridian_offset() = gdal_spatial_ref.GetPrimeMeridian();
// Set the proj4 string for datum.
std::stringstream datum_proj4_ss;
BOOST_FOREACH( std::string const& element, datum_strings )
datum_proj4_ss << element << " ";
// Add the current proj4 string in the case that our ellipse/datum
// values are empty.
if ( boost::trim_copy(datum_proj4_ss.str()) == "" )
datum_proj4_ss << datum.proj4_str();
datum.proj4_str() = boost::trim_copy(datum_proj4_ss.str());
set_datum(datum);
}
#endif // VW_HAVE_PKG_GDAL
/// For a given pixel coordinate, compute the position of that
/// pixel in this georeferenced space.
Vector2 GeoReference::pixel_to_point(Vector2 pix) const {
Vector2 loc;
Matrix3x3 M = this->vw_native_transform();
double denom = pix[0] * M(2,0) + pix[1] * M(2,1) + M(2,2);
loc[0] = (pix[0] * M(0,0) + pix[1] * M(0,1) + M(0,2)) / denom;
loc[1] = (pix[0] * M(1,0) + pix[1] * M(1,1) + M(1,2)) / denom;
return loc;
}
/// For a given location 'loc' in projected space, compute the
/// corresponding pixel coordinates in the image.
Vector2 GeoReference::point_to_pixel(Vector2 loc) const {
Vector2 pix;
Matrix3x3 M = this->vw_native_inverse_transform();
double denom = loc[0] * M(2,0) + loc[1] * M(2,1) + M(2,2);
pix[0] = (loc[0] * M(0,0) + loc[1] * M(0,1) + M(0,2)) / denom;
pix[1] = (loc[0] * M(1,0) + loc[1] * M(1,1) + M(1,2)) / denom;
return pix;
}
/// For a point in the projected space, compute the position of
/// that point in unprojected (Geographic) coordinates (lat,lon).
Vector2 GeoReference::point_to_lonlat(Vector2 loc) const {
if ( ! m_is_projected ) return loc;
projXY projected;
projLP unprojected;
projected.u = loc[0];
projected.v = loc[1];
unprojected = pj_inv(projected, m_proj_context.proj_ptr());
CHECK_PROJ_ERROR( m_proj_context );
// Convert from radians to degrees.
return Vector2(unprojected.u * RAD_TO_DEG, unprojected.v * RAD_TO_DEG);
}
/// Given a position in geographic coordinates (lat,lon), compute
/// the location in the projected coordinate system.
Vector2 GeoReference::lonlat_to_point(Vector2 lon_lat) const {
if ( ! m_is_projected ) return lon_lat;
// This value is proj's internal limit
static const double BOUND = 1.5707963267948966 - (1e-10) - std::numeric_limits<double>::epsilon();
projXY projected;
projLP unprojected;
// Proj.4 expects the (lon,lat) pair to be in radians
unprojected.u = lon_lat[0] * DEG_TO_RAD;
unprojected.v = lon_lat[1] * DEG_TO_RAD;
// Clamp the latitude range to [-HALFPI,HALFPI] ([-90, 90]) as occasionally
// we get edge pixels that extend slightly beyond that range (probably due
// to pixel as area vs point) and cause Proj.4 to fail. We use HALFPI
// rather than other incantations for pi/2 because that's what proj.4 uses.
if(unprojected.v > BOUND) unprojected.v = BOUND;
else if(unprojected.v < -BOUND) unprojected.v = -BOUND;
projected = pj_fwd(unprojected, m_proj_context.proj_ptr());
CHECK_PROJ_ERROR( m_proj_context );
return Vector2(projected.u, projected.v);
}
/************** Functions for class ProjContext *******************/
char** ProjContext::split_proj4_string(std::string const& proj4_str, int &num_strings) {
std::vector<std::string> arg_strings;
std::string trimmed_proj4_str = boost::trim_copy(proj4_str);
boost::split( arg_strings, trimmed_proj4_str, boost::is_any_of(" ") );
char** strings = new char*[arg_strings.size()];
for ( size_t i = 0; i < arg_strings.size(); ++i ) {
strings[i] = new char[2048];
strncpy(strings[i], arg_strings[i].c_str(), 2048);
}
num_strings = boost::numeric_cast<int>(arg_strings.size());
return strings;
}
#if PJ_VERSION < 480
ProjContext::ProjContext(std::string const& proj4_str) : m_proj4_str(proj4_str) {
// proj.4 is expecting the parameters to be split up into seperate
// c-style strings.
int num;
char** proj_strings = split_proj4_string(m_proj4_str, num);
m_proj_ptr.reset( pj_init(num, proj_strings),
pj_free );
VW_ASSERT( !pj_errno, InputErr() << "Proj.4 failed to initialize on string: " << m_proj4_str << "\n\tError was: " << pj_strerrno(pj_errno) );
for ( int i = 0; i < num; i++ ) delete [] proj_strings[i];
delete [] proj_strings;
}
ProjContext::ProjContext( ProjContext const& other ) : m_proj_ptr(other.m_proj_ptr), m_proj4_str(other.m_proj4_str) {}
int ProjContext::error_no() const {
return pj_errno;
}
#else
ProjContext::ProjContext(std::string const& proj4_str ) : m_proj4_str(proj4_str) {
m_proj_ctx_ptr.reset(pj_ctx_alloc(),pj_ctx_free);
int num;
char** proj_strings = split_proj4_string(m_proj4_str, num);
m_proj_ptr.reset(pj_init_ctx( m_proj_ctx_ptr.get(),
num, proj_strings ),
pj_free);
VW_ASSERT( !pj_ctx_get_errno(m_proj_ctx_ptr.get()),
InputErr() << "Proj.4 failed to initialize on string: " << m_proj4_str << "\n\tError was: " << pj_strerrno(pj_ctx_get_errno(m_proj_ctx_ptr.get())) );
for ( int i = 0; i < num; i++ ) delete [] proj_strings[i];
delete [] proj_strings;
}
ProjContext::ProjContext( ProjContext const& other ) : m_proj4_str(other.m_proj4_str) {
m_proj_ctx_ptr.reset(pj_ctx_alloc(),pj_ctx_free);
if ( m_proj4_str.empty() )
return; // They've made a copy of an uninitialized
// projcontext. Not an error .. since they can
// initialize later.
int num;
char** proj_strings = split_proj4_string(m_proj4_str, num);
m_proj_ptr.reset(pj_init_ctx( m_proj_ctx_ptr.get(),
num, proj_strings ),
pj_free);
VW_ASSERT( !pj_ctx_get_errno(m_proj_ctx_ptr.get()),
InputErr() << "Proj.4 failed to initialize on string: " << m_proj4_str << "\n\tError was: " << pj_strerrno(pj_ctx_get_errno(m_proj_ctx_ptr.get())) );
for ( int i = 0; i < num; i++ ) delete [] proj_strings[i];
delete [] proj_strings;
}
int ProjContext::error_no() const {
return pj_ctx_get_errno(m_proj_ctx_ptr.get());
}
#endif
// Simple GeoReference modification tools
GeoReference crop( GeoReference const& input,
double upper_left_x, double upper_left_y,
double /*width*/, double /*height*/ ) {
Vector2 top_left_ll;
if ( input.pixel_interpretation() == GeoReference::PixelAsArea ) {
top_left_ll = input.pixel_to_point( Vector2(upper_left_x, upper_left_y ) - Vector2(0.5,0.5) );
} else {
top_left_ll = input.pixel_to_point( Vector2(upper_left_x, upper_left_y ) );
}
GeoReference output = input;
Matrix3x3 T = output.transform();
T(0,2) = top_left_ll[0];
T(1,2) = top_left_ll[1];
output.set_transform(T);
return output;
}
GeoReference crop( GeoReference const& input,
BBox2 const& bbox ) {
return crop(input, bbox.min().x(), bbox.min().y(),
bbox.width(), bbox.height());
}
GeoReference resample( GeoReference const& input,
double scale_x, double scale_y ) {
GeoReference output = input;
Matrix3x3 T = output.transform();
T(0,0) /= scale_x;
T(1,1) /= scale_y;
if ( input.pixel_interpretation() == GeoReference::PixelAsArea ) {
Vector2 top_left_ll =
input.pixel_to_point( -Vector2(0.5 / scale_x, 0.5 / scale_y) );
T(0,2) = top_left_ll[0];
T(1,2) = top_left_ll[1];
}
output.set_transform(T);
return output;
}
GeoReference resample( GeoReference const& input,
double scale ) {
return resample(input, scale, scale );
}
}} // vw::cartography
#undef CHECK_PROJ_ERROR