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read_ogr.cpp
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read_ogr.cpp
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// Copyright (c) 2018-2025 Robert J. Hijmans
//
// This file is part of the "spat" library.
//
// spat is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// spat is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with spat. If not, see <http://www.gnu.org/licenses/>.
#include "spatVector.h"
#include "file_utils.h"
#include "ogrsf_frmts.h"
#include "ogr_spatialref.h"
#include "crs.h"
#include "NA.h"
#include "string_utils.h"
std::string geomType(OGRLayer *poLayer) {
std::string s = "";
poLayer->ResetReading();
OGRFeature *poFeature;
while( (poFeature = poLayer->GetNextFeature()) != NULL ) {
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
const char* gname = poGeometry->getGeometryName();
s = gname;
break;
}
OGRFeature::DestroyFeature( poFeature );
return s;
}
SpatDataFrame readAttributes(OGRLayer *poLayer, bool as_proxy) {
SpatDataFrame df;
OGRFeatureDefn *poFDefn = poLayer->GetLayerDefn();
size_t nfields = poFDefn->GetFieldCount();
if (nfields == 0) return df;
OGRFieldType ft;
OGRFieldDefn *poFieldDefn;
df.resize_cols(nfields);
unsigned dtype;
long longNA = NA<long>::value;
for (size_t i = 0; i < nfields; i++ ) {
poFieldDefn = poFDefn->GetFieldDefn(i);
std::string fname = poFieldDefn->GetNameRef();
ft = poFieldDefn->GetType();
if (ft == OFTReal) {
dtype = 0;
} else if ((ft == OFTInteger) | (ft == OFTInteger64)) {
if (poFieldDefn->GetSubType() == OFSTBoolean) {
dtype = 3;
} else {
dtype = 1;
}
} else {
dtype = 2;
}
df.add_column(dtype, fname);
}
OGRFeature *poFeature;
poLayer->ResetReading();
while( (poFeature = poLayer->GetNextFeature()) != NULL ) {
for (size_t i = 0; i < nfields; i++ ) {
poFieldDefn = poFDefn->GetFieldDefn( i );
unsigned j = df.iplace[i];
int not_null = poFeature->IsFieldSetAndNotNull(i);
switch( poFieldDefn->GetType() ) {
case OFTReal:
if (not_null) {
df.dv[j].push_back(poFeature->GetFieldAsDouble(i));
} else {
df.dv[j].push_back(NAN);
}
break;
case OFTInteger:
if (poFieldDefn->GetSubType() == OFSTBoolean) {
if (not_null) {
df.bv[j].push_back(poFeature->GetFieldAsInteger(i));
} else {
df.bv[j].push_back(2);
}
} else {
if (not_null) {
df.iv[j].push_back(poFeature->GetFieldAsInteger(i));
} else {
df.iv[j].push_back(longNA);
}
}
break;
case OFTInteger64:
if (not_null) {
df.iv[j].push_back(poFeature->GetFieldAsInteger64(i));
} else {
df.iv[j].push_back(longNA);
}
break;
// case OFTString:
default:
if (not_null) {
df.sv[j].push_back(poFeature->GetFieldAsString(i));
} else {
df.sv[j].push_back(df.NAS);
}
break;
}
}
OGRFeature::DestroyFeature(poFeature);
if (as_proxy) break;
}
return df;
}
/*
std::string getDs_WKT(GDALDataset *poDataset) {
std::string wkt = "";
char *cp;
#if GDAL_VERSION_MAJOR >= 3
const OGRSpatialReference *srs = poDataset->GetSpatialRef();
const char *options[3] = { "MULTILINE=YES", "FORMAT=WKT2", NULL };
OGRErr err = srs->exportToWkt(&cp, options);
if (err == OGRERR_NONE) {
wkt = std::string(cp);
CPLFree(cp);
}
#else
const char *pszSrc = GDALGetProjectionRef( poDataset );
if (pszSrc != NULL) {
wkt = std::string(pszSrc);
}
// if (poDataset->GetProjectionRef() != NULL) {
// OGRSpatialReference oSRS(poDataset->GetProjectionRef());
// OGRErr err = oSRS.exportToPrettyWkt(&cp);
// if (err == OGRERR_NONE) {
// wkt = std::string(cp);
// CPLFree(cp);
// }
// }
#endif
return wkt;
}
std::string getDs_PRJ(GDALDataset *poDataset) {
std::string prj = "";
#if GDAL_VERSION_MAJOR >= 3
char *cp;
const OGRSpatialReference *srs = poDataset->GetSpatialRef();
OGRErr err = srs->exportToProj4(&cp);
if (err == OGRERR_NONE) {
prj = std::string(cp);
CPLFree(cp);
}
#else
if( poDataset->GetProjectionRef() != NULL ) {
OGRSpatialReference oSRS(poDataset->GetProjectionRef());
char *pszPRJ = NULL;
oSRS.exportToProj4(&pszPRJ);
prj = pszPRJ;
}
#endif
return prj;
}
*/
SpatGeom getPointGeom(OGRGeometry *poGeometry) {
SpatGeom g(points);
if (poGeometry->IsEmpty()) {
return g;
}
#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(2,3,0)
OGRPoint *poPoint = poGeometry->toPoint();
#else
OGRPoint *poPoint = (OGRPoint *) poGeometry;
#endif
double x = poPoint->getX();
double y = poPoint->getY();
SpatPart p(x, y);
g.addPart(p);
return g;
}
SpatGeom getMultiPointGeom(OGRGeometry *poGeometry) {
OGRMultiPoint *poMultipoint = ( OGRMultiPoint * )poGeometry;
unsigned ng = poMultipoint->getNumGeometries();
std::vector<double> X(ng);
std::vector<double> Y(ng);
SpatGeom g(points);
for (size_t i=0; i<ng; i++) {
OGRGeometry *poMpGeometry = poMultipoint->getGeometryRef(i);
#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(2,3,0)
OGRPoint *poPoint = poMpGeometry->toPoint();
#else
OGRPoint *poPoint = (OGRPoint *) poMpGeometry;
#endif
double x = poPoint->getX();
double y = poPoint->getY();
SpatPart p(x, y);
g.addPart(p);
}
return g;
}
SpatGeom getLinesGeom(OGRGeometry *poGeometry) {
OGRLineString *poGeom = (OGRLineString *) poGeometry;
unsigned np = poGeom->getNumPoints();
std::vector<double> X(np);
std::vector<double> Y(np);
OGRPoint ogrPt;
for (size_t i=0; i<np; i++) {
poGeom->getPoint(i, &ogrPt);
X[i] = ogrPt.getX();
Y[i] = ogrPt.getY();
}
SpatPart p(X, Y);
SpatGeom g(lines);
g.addPart(p);
return g;
}
SpatGeom getMultiLinesGeom(OGRGeometry *poGeometry) {
SpatGeom g(lines);
OGRMultiLineString *poGeom = ( OGRMultiLineString * )poGeometry;
unsigned ng = poGeom->getNumGeometries();
OGRPoint ogrPt;
for (size_t i=0; i<ng; i++) {
OGRGeometry *poLineGeometry = poGeom->getGeometryRef(i);
OGRLineString *poLine = ( OGRLineString * )poLineGeometry;
unsigned np = poLine->getNumPoints();
std::vector<double> X(np);
std::vector<double> Y(np);
for (size_t j=0; j<np; j++ ) {
poLine->getPoint(j, &ogrPt);
X[j] = ogrPt.getX();
Y[j] = ogrPt.getY();
}
SpatPart p(X, Y);
g.addPart(p);
}
return g;
}
//#include "Rcpp.h"
SpatGeom getPolygonsGeom(OGRGeometry *poGeometry) {
SpatGeom g(polygons);
OGRPoint ogrPt;
// OGRwkbGeometryType geomtype = poGeometry->getGeometryType();
// if ( geomtype == wkbPolygon ) {
OGRPolygon *poGeom = ( OGRPolygon * )poGeometry;
OGRLinearRing *poRing = poGeom->getExteriorRing();
unsigned np = poRing->getNumPoints();
std::vector<double> X(np);
std::vector<double> Y(np);
for (size_t i=0; i<np; i++) {
poRing->getPoint(i, &ogrPt);
X[i] = ogrPt.getX();
Y[i] = ogrPt.getY();
}
SpatPart p(X, Y);
unsigned nh = poGeom->getNumInteriorRings();
for (size_t i=0; i<nh; i++) {
OGRLinearRing *poHole = poGeom->getInteriorRing(i);
unsigned np = poHole->getNumPoints();
std::vector<double> X(np);
std::vector<double> Y(np);
for (size_t j=0; j<np; j++) {
poHole->getPoint(j, &ogrPt);
X[j] = ogrPt.getX();
Y[j] = ogrPt.getY();
}
p.addHole(X, Y);
}
g.addPart(p);
// }
return g;
}
SpatGeom getMultiPolygonsGeom(OGRGeometry *poGeometry) {
OGRMultiPolygon *poGeom = ( OGRMultiPolygon * )poGeometry;
OGRPoint ogrPt;
unsigned ng = poGeom->getNumGeometries();
SpatGeom g(polygons);
for (size_t i=0; i<ng; i++) {
OGRGeometry *poPolygonGeometry = poGeom->getGeometryRef(i);
OGRPolygon *poPolygon = ( OGRPolygon * )poPolygonGeometry;
OGRLinearRing *poRing = poPolygon->getExteriorRing();
unsigned np = poRing->getNumPoints();
std::vector<double> X(np);
std::vector<double> Y(np);
for (size_t j=0; j<np; j++ ) {
poRing->getPoint(j, &ogrPt);
X[j] = ogrPt.getX();
Y[j] = ogrPt.getY();
}
SpatPart p(X, Y);
unsigned nh = poPolygon->getNumInteriorRings();
for (size_t j=0; j<nh; j++) {
OGRLinearRing *poHole = poPolygon->getInteriorRing(j);
np = poHole->getNumPoints();
std::vector<double> X(np);
std::vector<double> Y(np);
for (size_t k = 0; k < np; k++ ) {
poHole->getPoint(k, &ogrPt);
X[k] = ogrPt.getX();
Y[k] = ogrPt.getY();
}
p.addHole(X, Y);
}
g.addPart(p);
}
return g;
}
std::vector<std::string> SpatVector::layer_names(std::string filename) {
std::vector<std::string> out;
if (filename.empty()) {
setError("empty filename");
return out;
}
// a gdb is a folder...
//if (!file_exists(filename)) {
// setError("file does not exist");
// return out;
//}
GDALDataset *poDS = static_cast<GDALDataset*>(GDALOpenEx(filename.c_str(), GDAL_OF_VECTOR,
NULL, NULL, NULL ));
if( poDS == NULL ) {
setError("Cannot open this dataset" );
return out;
}
size_t n = poDS->GetLayerCount();
out.reserve(n);
for (size_t i=0; i<n; i++) {
OGRLayer *poLayer = poDS->GetLayer(i);
if (poLayer == NULL) {
out.push_back("");
} else {
out.push_back((std::string)poLayer->GetName());
}
}
GDALClose(poDS);
return out;
}
SpatGeom emptyGeom() {
SpatGeom g;
g.gtype = null;
g.extent.xmin=NAN;
g.extent.xmax=NAN;
g.extent.ymin=NAN;
g.extent.ymax=NAN;
return g;
}
bool layerQueryFilter(GDALDataset *&poDS, OGRLayer *&poLayer, std::string &layer, std::string &query, std::vector<double> &ext, SpatVector &filter, std::string &errmsg, std::vector<std::string> &wrms) {
if (query.empty()) {
if (layer.empty()) {
#if GDAL_VERSION_MAJOR <= 2 && GDAL_VERSION_MINOR <= 2
// do nothing
#else
std::vector<std::string> lyrnms;
for ( auto&& poLayer: poDS->GetLayers() ) {
lyrnms.push_back((std::string)poLayer->GetName());
}
if (lyrnms.size() > 1) {
std::string lyrsel = lyrnms[0];
lyrnms.erase(lyrnms.begin());
std::string ccat = concatenate(lyrnms, ", ");
wrms.push_back("Reading layer: " + lyrsel + "\nOther layers: " + ccat);
}
#endif
poLayer = poDS->GetLayer(0);
if (poLayer == NULL) {
errmsg = "dataset has no layers";
return false;
}
} else {
poLayer = poDS->GetLayerByName(layer.c_str());
if (poLayer == NULL) {
errmsg = layer + " is not a valid layer name";
#if GDAL_VERSION_MAJOR <= 2 && GDAL_VERSION_MINOR <= 2
// do nothing
#else
errmsg += "\nChoose one of: ";
for ( auto&& poLayer: poDS->GetLayers() ) {
errmsg += (std::string)poLayer->GetName() + ", ";
}
errmsg = errmsg.substr(0, errmsg.size()-2);
#endif
return false;
}
}
} else {
poLayer = poDS->ExecuteSQL(query.c_str(), NULL, NULL);
if (poLayer == NULL) {
errmsg = "Query failed";
return false;
}
}
if (filter.nrow() > 0) {
if (filter.type() != "polygons") {
filter = filter.hull("convex");
} else if (filter.nrow() > 1) {
filter = filter.aggregate(true);
}
GDALDataset *filterDS = filter.write_ogr("", "lyr", "Memory", false, true, std::vector<std::string>());
if (filter.hasError()) {
//setError(filter.getError());
GDALClose(filterDS);
errmsg = "filter has error";
return false;
}
OGRLayer *fLayer = filterDS->GetLayer(0);
fLayer->ResetReading();
OGRFeature *fFeature = fLayer->GetNextFeature();
if (fFeature != NULL ) {
OGRGeometry *fGeometry = fFeature->StealGeometry();
poLayer->SetSpatialFilter(fGeometry);
OGRGeometryFactory::destroyGeometry(fGeometry);
}
OGRFeature::DestroyFeature( fFeature );
GDALClose(filterDS);
} else if (!ext.empty()) {
poLayer->SetSpatialFilterRect(ext[0], ext[2], ext[1], ext[3]);
}
return true;
}
bool SpatVector::read_ogr(GDALDataset *&poDS, std::string layer, std::string query, std::vector<double> ext, SpatVector filter, bool as_proxy, std::string what) {
if (poDS == NULL) {
setError("dataset is empty");
return false;
}
std::string crs = "";
OGRLayer *poLayer;
poLayer = poDS->GetLayer(0);
read_query = query;
read_extent = ext;
std::string errmsg;
std::vector<std::string> wrnmsg;
if (!layerQueryFilter(poDS, poLayer, layer, query, ext, filter, errmsg, wrnmsg)) {
setError(errmsg);
return false;
} else if (!wrnmsg.empty()) {
for (size_t i=0; i < wrnmsg.size(); i++) addWarning(wrnmsg[i]);
}
OGRSpatialReference *poSRS = poLayer->GetSpatialRef();
if (poSRS) {
char *psz = NULL;
#if GDAL_VERSION_MAJOR >= 3
const char *options[3] = { "MULTILINE=YES", "FORMAT=WKT2", NULL };
OGRErr err = poSRS->exportToWkt(&psz, options);
#else
OGRErr err = poSRS->exportToWkt(&psz);
#endif
if (err == OGRERR_NONE) {
crs = psz;
}
setSRS(crs);
CPLFree(psz);
}
if (what != "geoms") {
df = readAttributes(poLayer, as_proxy);
}
if (what == "attributes") {
if (!query.empty()) {
poDS->ReleaseResultSet(poLayer);
}
return true;
}
//const char* lname = poLayer->GetName();
OGRwkbGeometryType wkbgeom = wkbFlatten(poLayer->GetGeomType());
OGRFeature *poFeature;
poLayer->ResetReading();
poFeature = poLayer->GetNextFeature();
if (poFeature != NULL) {
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
if (poGeometry != NULL) {
if (poGeometry->Is3D()) {
addWarning("Z coordinates ignored");
}
if (poGeometry->IsMeasured()) {
addWarning("M coordinates ignored");
}
}
}
source_layer = poLayer->GetName();
if (as_proxy) {
SpatGeom g;
if ((wkbgeom == wkbPoint) | (wkbgeom == wkbMultiPoint)) {
//SpatPart p(0,0);
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
if (poGeometry != NULL) {
if ( wkbFlatten(poGeometry->getGeometryType()) == wkbPoint ) {
g = getPointGeom(poGeometry);
} else {
g = getMultiPointGeom(poGeometry);
}
} else {
g = emptyGeom();
}
addGeom(g);
OGRFeature::DestroyFeature( poFeature );
} else if (wkbgeom == wkbLineString || wkbgeom == wkbMultiLineString) {
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
if (poGeometry != NULL) {
if (wkbFlatten ( poGeometry ->getGeometryType() ) == wkbLineString) {
g = getLinesGeom(poGeometry);
} else {
g = getMultiLinesGeom(poGeometry);
}
} else {
g = emptyGeom();
}
addGeom(g);
OGRFeature::DestroyFeature( poFeature );
} else if ( wkbgeom == wkbPolygon || wkbgeom == wkbMultiPolygon) {
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
if (poGeometry != NULL) {
wkbgeom = wkbFlatten(poGeometry->getGeometryType());
if (wkbgeom == wkbPolygon) {
g = getPolygonsGeom(poGeometry);
} else if (wkbgeom == wkbMultiPolygon ) {
g = getMultiPolygonsGeom(poGeometry);
} // else ?
} else {
g = emptyGeom();
}
addGeom(g);
OGRFeature::DestroyFeature( poFeature );
} else if (wkbgeom == wkbUnknown) {
long long fcnt = poLayer->GetFeatureCount(true);
if (fcnt == 0) return true;
if (fcnt < 0) {
if ( (poFeature = poLayer->GetNextFeature()) != NULL ) {
return true;
}
}
const char *geomtypechar = OGRGeometryTypeToName(wkbgeom);
std::string strgeomtype = geomtypechar;
std::string s = "cannot read this geometry type: "+ strgeomtype;
setError(s);
return false;
} else if (wkbgeom != wkbNone) {
const char *geomtypechar = OGRGeometryTypeToName(wkbgeom);
std::string strgeomtype = geomtypechar;
std::string s = "cannot read this geometry type: "+ strgeomtype;
setError(s);
return false;
}
geom_count = poLayer->GetFeatureCount();
// not checking for multiple geom fields
// int nGeomFieldCount = poLayer->GetLayerDefn()->GetGeomFieldCount();
OGREnvelope oExt;
if (poLayer->GetExtent(&oExt, FALSE) == OGRERR_NONE) {
extent.xmin = oExt.MinX;
extent.xmax = oExt.MaxX;
extent.ymin = oExt.MinY;
extent.ymax = oExt.MaxY;
} else {
extent.xmin = NAN;
extent.xmax = NAN;
extent.ymin = NAN;
extent.ymax = NAN;
}
is_proxy = true;
return true;
}
OGRFeature::DestroyFeature( poFeature );
poLayer->ResetReading();
SpatGeom g;
if ((wkbgeom == wkbPoint) | (wkbgeom == wkbMultiPoint)) {
//SpatPart p(0,0);
while( (poFeature = poLayer->GetNextFeature()) != NULL ) {
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
if (poGeometry != NULL) {
if ( wkbFlatten(poGeometry->getGeometryType()) == wkbPoint ) {
g = getPointGeom(poGeometry);
} else {
g = getMultiPointGeom(poGeometry);
}
} else {
g = emptyGeom();
}
addGeom(g);
OGRFeature::DestroyFeature( poFeature );
}
} else if (wkbgeom == wkbLineString || wkbgeom == wkbMultiLineString) {
while ( (poFeature = poLayer->GetNextFeature()) != NULL ) {
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
if (poGeometry != NULL) {
if (wkbFlatten ( poGeometry ->getGeometryType() ) == wkbLineString) {
g = getLinesGeom(poGeometry);
} else {
g = getMultiLinesGeom(poGeometry);
}
} else {
g = emptyGeom();
}
addGeom(g);
OGRFeature::DestroyFeature( poFeature );
}
} else if ( wkbgeom == wkbPolygon || wkbgeom == wkbMultiPolygon) {
while ( (poFeature = poLayer->GetNextFeature()) != NULL ) {
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
if (poGeometry != NULL) {
wkbgeom = wkbFlatten(poGeometry->getGeometryType());
if (wkbgeom == wkbPolygon) {
g = getPolygonsGeom(poGeometry);
} else if (wkbgeom == wkbMultiPolygon ) {
g = getMultiPolygonsGeom(poGeometry);
}
} else {
g = emptyGeom();
}
addGeom(g);
OGRFeature::DestroyFeature( poFeature );
}
} else if (wkbgeom == wkbUnknown) {
long long fcnt = poLayer->GetFeatureCount(true);
if (fcnt == 0) return true;
if (fcnt < 0) {
if ( (poFeature = poLayer->GetNextFeature()) != NULL ) {
return true;
}
}
SpatVectorCollection sv;
std::vector<double> dempty;
SpatVector filter2;
sv.read_ogr(poDS, "", "", dempty, filter2);
if (sv.size() > 0) {
*this = sv.v[0];
if (sv.v.size() > 1) {
std::string gt = type();
addWarning("returning " + gt + " ignoring additional geometry types. Use 'svc' to get all geometries");
}
return true;
}
if (sv.hasError()) {
setError(sv.getError());
}
return false;
} else if (wkbgeom != wkbNone) {
const char *geomtypechar = OGRGeometryTypeToName(wkbgeom);
std::string strgeomtype = geomtypechar;
std::string s = "cannot read this geometry type: "+ strgeomtype;
setError(s);
return false;
}
if (!query.empty()) {
poDS->ReleaseResultSet(poLayer);
}
return true;
}
bool SpatVector::read(std::string fname, std::string layer, std::string query, std::vector<double> ext, SpatVector filter, bool as_proxy, std::string what, std::vector<std::string> options) {
char ** openops = NULL;
for (size_t i=0; i<options.size(); i++) {
std::vector<std::string> opt = strsplit(options[i], "=");
if (opt.size() == 2) {
openops = CSLSetNameValue(openops, opt[0].c_str(), opt[1].c_str());
}
}
GDALDataset *poDS = static_cast<GDALDataset*>(GDALOpenEx( fname.c_str(), GDAL_OF_VECTOR, NULL, openops, NULL ));
if( poDS == NULL ) {
if (!file_exists(fname)) {
setError("file does not exist: " + fname);
} else {
setError("Cannot open this file as a SpatVector: " + fname);
}
return false;
}
bool success = read_ogr(poDS, layer, query, ext, filter, as_proxy, what);
if (poDS != NULL) GDALClose( poDS );
source = fname;
return success;
}
SpatVector SpatVector::fromDS(GDALDataset *poDS) {
SpatVector out, fvct;
std::vector<double> fext;
out.read_ogr(poDS, "", "", fext, fvct, false, "");
return out;
}
SpatVector::SpatVector(std::vector<std::string> wkt) {
OGRGeometryFactory ogr;
SpatGeom g;
bool haveGeomt = false;
SpatGeomType geomt = null;
for (size_t i=0; i<wkt.size(); i++) {
if (wkt[i] == "EMPTY") {
g = emptyGeom();
addGeom(g);
continue;
}
OGRGeometry *poGeometry;
#if GDAL_VERSION_MAJOR <= 2 && GDAL_VERSION_MINOR <= 2
char *cstring = &wkt[i][0];
std::vector<char*> cstr = { cstring };
OGRErr err = ogr.createFromWkt(&cstr[0], NULL, &poGeometry );
#else
const char* pszWKT = wkt[i].c_str();
OGRErr err = ogr.createFromWkt( pszWKT, NULL, &poGeometry );
#endif
if (err == OGRERR_NONE) {
//const char* gname = poGeometry->getGeometryName();
if (poGeometry != NULL) {
OGRwkbGeometryType gtype = wkbFlatten(poGeometry->getGeometryType());
if ( gtype == wkbPoint ) {
g = getPointGeom(poGeometry);
} else if ( gtype == wkbMultiPoint ) {
g = getMultiPointGeom(poGeometry);
} else if (gtype == wkbLineString) {
g = getLinesGeom(poGeometry);
} else if (gtype == wkbMultiLineString) {
g = getMultiLinesGeom(poGeometry);
} else if (gtype == wkbPolygon) {
g = getPolygonsGeom(poGeometry);
} else if (gtype == wkbMultiPolygon ) {
g = getMultiPolygonsGeom(poGeometry);
} else {
const char *geomtypechar = OGRGeometryTypeToName(gtype);
std::string strgeomtype = geomtypechar;
std::string s = "cannot read geometry type: "+ strgeomtype;
setError(s);
return;
}
if (!haveGeomt) {
haveGeomt = true;
geomt = g.gtype;
} else if (geomt != g.gtype) {
setError("a SpatVector can only have a single geometry type");
return;
}
addGeom(g);
OGRGeometryFactory::destroyGeometry(poGeometry);
}
} else {
setError("not WKT");
return;
}
}
}
bool SpatVectorCollection::read_ogr(GDALDataset *&poDS, std::string layer, std::string query, std::vector<double> extent, SpatVector filter) {
OGRLayer *poLayer;
poLayer = poDS->GetLayer(0);
std::string errmsg;
std::vector<std::string> wrnmsg;
if (!layerQueryFilter(poDS, poLayer, layer, query, extent, filter, errmsg, wrnmsg)) {
setError(errmsg);
return false;
} else if (!wrnmsg.empty()) {
for (size_t i=0; i < wrnmsg.size(); i++) addWarning(wrnmsg[i]);
}
std::string crs = "";
OGRSpatialReference *poSRS = poLayer->GetSpatialRef();
if (poSRS) {
char *psz = NULL;
#if GDAL_VERSION_MAJOR >= 3
const char *options[3] = { "MULTILINE=YES", "FORMAT=WKT2", NULL };
OGRErr err = poSRS->exportToWkt(&psz, options);
#else
OGRErr err = poSRS->exportToWkt(&psz);
#endif
if (err == OGRERR_NONE) {
crs = psz;
}
CPLFree(psz);
}
//const char* lname = poLayer->GetName();
// OGRwkbGeometryType wkbgeom = wkbFlatten(poLayer->GetGeomType());
OGRFeature *poFeature;
poLayer->ResetReading();
poFeature = poLayer->GetNextFeature();
if (poFeature != NULL) {
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
if (poGeometry != NULL) {
if (poGeometry->Is3D()) {
addWarning("Z coordinates ignored");
}
if (poGeometry->IsMeasured()) {
addWarning("M coordinates ignored");
}
}
}
std::string source_layer = poLayer->GetName();
OGRFeature::DestroyFeature( poFeature );
SpatDataFrame df = readAttributes(poLayer, false);
poLayer->ResetReading();
SpatVector points, lines, polygons;
std::vector<unsigned> pnt, lin, pol;
SpatGeom g;
size_t i = 0;
while( (poFeature = poLayer->GetNextFeature()) != NULL ) {
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
if (poGeometry != NULL) {
OGRwkbGeometryType wkb = wkbFlatten(poGeometry->getGeometryType());
if (wkb == wkbPoint ) {
g = getPointGeom(poGeometry);
points.addGeom(g);
pnt.push_back(i);
} else if ((wkb == wkbMultiPoint) || (wkb == wkbMultiPointZM) || (wkb == wkbMultiPointM)) {
g = getMultiPointGeom(poGeometry);
points.addGeom(g);
pnt.push_back(i);
} else if (wkb == wkbLineString) {
g = getLinesGeom(poGeometry);
lines.addGeom(g);
lin.push_back(i);
} else if ((wkb == wkbMultiLineString) || (wkb == wkbMultiLineStringZM) || (wkb == wkbMultiLineStringM)) {
g = getMultiLinesGeom(poGeometry);
lines.addGeom(g);
lin.push_back(i);
} else if (wkb == wkbPolygon) {
g = getPolygonsGeom(poGeometry);
polygons.addGeom(g);
pol.push_back(i);
} else if ((wkb == wkbMultiPolygon) || (wkb == wkbMultiPolygonZM) || (wkb == wkbMultiPolygonM)) {
g = getMultiPolygonsGeom(poGeometry);
polygons.addGeom(g);
pol.push_back(i);
} else {
// g = emptyGeom();
}
OGRFeature::DestroyFeature( poFeature );
i++;
}
}
if (!query.empty()) {
poDS->ReleaseResultSet(poLayer);
}
if (polygons.size() > 0) {
polygons.setSRS(crs);
polygons.read_query = query;
polygons.read_extent= extent;
polygons.source_layer = source_layer;
if (df.ncol() > 0) polygons.df = df.subset_rows(pol);
v.push_back(polygons);
}
if (lines.size() > 0) {
lines.setSRS(crs);
lines.read_query = query;
lines.read_extent= extent;
lines.source_layer = source_layer;
if (df.ncol() > 0) lines.df = df.subset_rows(lin);
v.push_back(lines);
}
if (points.size() > 0) {
points.setSRS(crs);
points.read_query = query;
points.read_extent= extent;
points.source_layer = source_layer;
if (df.ncol() > 0) points.df = df.subset_rows(pnt);
v.push_back(points);
}
return true;
}
bool SpatVectorCollection::read(std::string fname, std::string layer, std::string query, std::vector<double> extent, SpatVector filter) {
//OGRRegisterAll();
GDALDataset *poDS = static_cast<GDALDataset*>(GDALOpenEx( fname.c_str(), GDAL_OF_VECTOR, NULL, NULL, NULL ));
if( poDS == NULL ) {
if (!file_exists(fname)) {
setError("file does not exist: " + fname);
} else {
setError("Cannot open this file as a SpatVector: " + fname);
}
return false;
}
bool success = read_ogr(poDS, layer, query, extent, filter);
if (poDS != NULL) GDALClose( poDS );
return success;
}
SpatVectorCollection::SpatVectorCollection(std::string filename, std::string layer, std::string query, std::vector<double> extent, SpatVector filter) {
read(filename, layer, query, extent, filter);
}