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/******************************************************************************
*
* Project: WMS Client Driver
* Purpose: Implementation of the OnEarth Tiled WMS minidriver.
* http://onearth.jpl.nasa.gov/tiled.html
* Author: Lucian Plesea (Lucian dot Plesea at jpl.nasa.gov)
* Adam Nowacki
*
******************************************************************************
* Copyright (c) 2007, Adam Nowacki
*
* 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.
****************************************************************************/
#include "stdinc.h"
CPP_GDALWMSMiniDriverFactory(TiledWMS)
static char SIG[]="GDAL_WMS TiledWMS: ";
/*
*\brief Read a number from an xml element
*/
static double getXMLNum(CPLXMLNode *poRoot, const char *pszPath, const char *pszDefault)
{
return CPLAtof(CPLGetXMLValue(poRoot,pszPath,pszDefault));
}
/*
*\brief Read a ColorEntry XML node, return a GDALColorEntry structure
*
*/
static GDALColorEntry GetXMLColorEntry(CPLXMLNode *p)
{
GDALColorEntry ce;
ce.c1= static_cast<short>(getXMLNum(p,"c1","0"));
ce.c2= static_cast<short>(getXMLNum(p,"c2","0"));
ce.c3= static_cast<short>(getXMLNum(p,"c3","0"));
ce.c4= static_cast<short>(getXMLNum(p,"c4","255"));
return ce;
}
/************************************************************************/
/* SearchXMLSiblings() */
/************************************************************************/
/*
* \brief Search for a sibling of the root node with a given name.
*
* Searches only the next siblings of the node passed in for the named element or attribute.
* If the first character of the pszElement is '=', the search includes the psRoot node
*
* @param psRoot the root node to search. This should be a node of type
* CXT_Element. NULL is safe.
*
* @param pszElement the name of the element or attribute to search for.
*
*
* @return The first matching node or NULL on failure.
*/
static CPLXMLNode *SearchXMLSiblings( CPLXMLNode *psRoot, const char *pszElement )
{
if( psRoot == NULL || pszElement == NULL )
return NULL;
// If the strings starts with '=', skip it and test the root
// If not, start testing with the next sibling
if (pszElement[0]=='=')
pszElement++;
else
psRoot=psRoot->psNext;
for (;psRoot!=NULL;psRoot=psRoot->psNext)
{
if ((psRoot->eType == CXT_Element ||
psRoot->eType == CXT_Attribute)
&& EQUAL(pszElement,psRoot->pszValue))
return psRoot;
}
return NULL;
}
/************************************************************************/
/* SearchLeafGroupName() */
/************************************************************************/
/*
* \brief Search for a leaf TileGroup node by name.
*
* @param psRoot the root node to search. This should be a node of type
* CXT_Element. NULL is safe.
*
* @param pszElement the name of the TileGroup to search for.
*
* @return The XML node of the matching TileGroup or NULL on failure.
*/
static CPLXMLNode *SearchLeafGroupName( CPLXMLNode *psRoot, const char *name )
{
CPLXMLNode *ret=NULL;
if( psRoot == NULL || name == NULL ) return NULL;
// Has to be a leaf TileGroup with the right name
if (NULL==SearchXMLSiblings(psRoot->psChild,"TiledGroup"))
{
if (EQUAL(name,CPLGetXMLValue(psRoot,"Name","")))
{
return psRoot;
}
else
{ // Try a sibling
return SearchLeafGroupName(psRoot->psNext,name);
}
}
else
{ // Is metagroup, try children then siblings
ret=SearchLeafGroupName(psRoot->psChild,name);
if (NULL!=ret) return ret;
return SearchLeafGroupName(psRoot->psNext,name);
}
}
/************************************************************************/
/* BandInterp() */
/************************************************************************/
/*
* \brief Utility function to calculate color band interpretation.
* Only handles Gray, GrayAlpha, RGB and RGBA, based on total band count
*
* @param nbands is the total number of bands in the image
*
* @param band is the band number, starting with 1
*
* @return GDALColorInterp of the band
*/
static GDALColorInterp BandInterp(int nbands, int band) {
switch (nbands) {
case 1: return GCI_GrayIndex;
case 2: return ((band==1)?GCI_GrayIndex:GCI_AlphaBand);
case 3: // RGB
case 4: // RBGA
if (band<3)
return ((band==1)?GCI_RedBand:GCI_GreenBand);
return ((band==3)?GCI_BlueBand:GCI_AlphaBand);
default:
return GCI_Undefined;
}
}
/************************************************************************/
/* FindBbox() */
/************************************************************************/
/*
* \brief Utility function to find the position of the bbox parameter value
* within a request string. The search for the bbox is case insensitive
*
* @param in, the string to search into
*
* @return The position from the begining of the string or -1 if not found
*/
static int FindBbox(CPLString in) {
size_t pos = in.ifind("&bbox=");
if (pos == std::string::npos)
return -1;
else
return (int)pos + 6;
}
/************************************************************************/
/* FindChangePattern() */
/************************************************************************/
/*
* \brief Build the right request pattern based on the change request list
* It only gets called on initialization
* @param cdata, possible request strings, white space separated
* @param substs, the list of substitutions to be applied
* @param keys, the list of available substitution keys
* @param ret The return value, a matching request or an empty string
*/
static void FindChangePattern( char *cdata,char **substs, char **keys, CPLString &ret)
{
char **papszTokens=CSLTokenizeString2(cdata," \t\n\r",
CSLT_STRIPLEADSPACES|CSLT_STRIPENDSPACES);
ret.clear();
int matchcount=CSLCount(substs);
int keycount=CSLCount(keys);
if (keycount<matchcount)
{
CSLDestroy(papszTokens);
return;
}
// A valid string has only the keys in the substs list and none other
for (int j=0;j<CSLCount(papszTokens);j++)
{
ret=papszTokens[j]; // The target string
bool matches=true;
for (int k=0;k<keycount;k++)
{
const char *key=keys[k];
int sub_number=CSLPartialFindString(substs,key);
if (sub_number!=-1)
{ // It is a listed match
// But is the match for the key position?
char *found_key=NULL;
const char *found_value=CPLParseNameValue(substs[sub_number],&found_key);
if (found_key!=NULL && EQUAL(found_key,key))
{ // Should exits in the request
if (std::string::npos==ret.find(key))
{
matches=false;
break;
}
// Execute the substitution on the "ret" string
URLSearchAndReplace(&ret,key,found_value);
}
if (found_key!=NULL) CPLFree(found_key);
}
else
{ // Key not in the subst list, should not match
if (std::string::npos!=ret.find(key))
{
matches=false;
break;
}
}
} // Key loop
if (matches)
{
CSLDestroy(papszTokens);
return; // We got the string ready, all keys accounted for and substs applied
}
}
ret.clear();
CSLDestroy(papszTokens);
}
GDALWMSMiniDriver_TiledWMS::GDALWMSMiniDriver_TiledWMS() {
m_requests = NULL;
}
GDALWMSMiniDriver_TiledWMS::~GDALWMSMiniDriver_TiledWMS() {
CSLDestroy(m_requests);
}
// Returns the scale of a WMS request as compared to the base resolution
double GDALWMSMiniDriver_TiledWMS::Scale(const char *request) {
int bbox=FindBbox(request);
if (bbox<0) return 0;
double x,y,X,Y;
sscanf(request+bbox,"%lf,%lf,%lf,%lf",&x,&y,&X,&Y);
return (m_data_window.m_x1-m_data_window.m_x0)/(X-x)*m_bsx/m_data_window.m_sx;
}
// Finds, extracts, and returns the highest resolution request string from a list, starting at item i
CPLString GDALWMSMiniDriver_TiledWMS::GetLowestScale(char **& list,int i)
{
CPLString req;
double scale=-1;
int position=-1;
while (NULL!=list[i])
{
double tscale=Scale(list[i]);
if (tscale>=scale)
{
scale=tscale;
position=i;
}
i++;
}
if (position>-1)
{
req=list[position];
list = CSLRemoveStrings(list,position,1,NULL);
}
return req;
}
/*
*\Brief Initialize minidriver with info from the server
*/
CPLErr GDALWMSMiniDriver_TiledWMS::Initialize(CPLXMLNode *config)
{
CPLErr ret = CE_None;
CPLXMLNode *tileServiceConfig=NULL;
CPLHTTPResult *psResult=NULL;
CPLXMLNode *TG=NULL;
char **requests=NULL;
char **substs=NULL;
char **keys=NULL;
for (int once=1;once;once--) { // Something to break out of
// Parse info from the service
m_end_url = CPLGetXMLValue(config,"AdditionalArgs","");
m_base_url = CPLGetXMLValue(config, "ServerURL", "");
if (m_base_url.empty()) {
CPLError(ret=CE_Failure, CPLE_AppDefined, "%s ServerURL missing.",SIG);
break;
}
CPLString tiledGroupName (CPLGetXMLValue(config, "TiledGroupName", ""));
if (tiledGroupName.empty()) {
CPLError(ret=CE_Failure, CPLE_AppDefined, "%s TiledGroupName missing.",SIG);
break;
}
// Change strings, key is an attribute, value is the value of the Change node
// Multiple substitutions are possible
TG=CPLSearchXMLNode(config, "Change");
while(TG!=NULL) {
CPLString name=CPLGetXMLValue(TG,"key","");
if (name.empty()) {
CPLError(ret=CE_Failure, CPLE_AppDefined,
"%s Change element needs a non-empty \"key\" attribute",SIG);
break;
}
substs=CSLSetNameValue(substs,name,CPLGetXMLValue(TG,"",""));
TG=SearchXMLSiblings(TG,"Change");
}
if (ret!=CE_None) break;
CPLString getTileServiceUrl = m_base_url + "request=GetTileService";
psResult = CPLHTTPFetch(getTileServiceUrl, NULL);
if (NULL==psResult) {
CPLError(ret=CE_Failure, CPLE_AppDefined, "%s Can't use HTTP", SIG);
break;
}
if ((psResult->nStatus!=0)||(NULL==psResult->pabyData)||('\0'==psResult->pabyData[0])) {
CPLError(ret=CE_Failure, CPLE_AppDefined, "%s Server response error on GetTileService.",SIG);
break;
}
if (NULL==(tileServiceConfig=CPLParseXMLString((const char*)psResult->pabyData))) {
CPLError(ret=CE_Failure,CPLE_AppDefined, "%s Error parsing the GetTileService response.",SIG);
break;
}
if (NULL==(TG=CPLSearchXMLNode(tileServiceConfig, "TiledPatterns"))) {
CPLError(ret=CE_Failure,CPLE_AppDefined,
"%s Can't locate TiledPatterns in server response.",SIG);
break;
}
// Get the global base_url and bounding box, these can be overwritten at the tileGroup level
// They are just pointers into existing structures, cleanup is not required
const char *global_base_url=CPLGetXMLValue(tileServiceConfig,"TiledPatterns.OnlineResource.xlink:href","");
CPLXMLNode *global_latlonbbox=CPLGetXMLNode(tileServiceConfig, "TiledPatterns.LatLonBoundingBox");
CPLXMLNode *global_bbox=CPLGetXMLNode(tileServiceConfig, "TiledPatterns.BoundingBox");
if (NULL==(TG=SearchLeafGroupName(TG->psChild,tiledGroupName))) {
CPLError(ret=CE_Failure,CPLE_AppDefined,
"%s Can't locate TiledGroup ""%s"" in server response.",SIG,
tiledGroupName.c_str());
break;
}
int band_count=atoi(CPLGetXMLValue(TG, "Bands", "3"));
if (!GDALCheckBandCount(band_count, FALSE)) {
CPLError(ret=CE_Failure,CPLE_AppDefined,"%s%s",SIG,
"Invalid number of bands in server response");
break;
}
// Collect all keys defined by this tileset
if (NULL!=CPLGetXMLNode(TG,"Key")) {
CPLXMLNode *node=CPLGetXMLNode(TG,"Key");
while (NULL!=node) {
const char *val=CPLGetXMLValue(node,NULL,NULL);
if (val) keys=CSLAddString(keys,val);
node=SearchXMLSiblings(node,"Key");
}
}
// Data values are attributes, they include NoData Min and Max
if (0!=CPLGetXMLNode(TG,"DataValues")) {
const char *nodata=CPLGetXMLValue(TG,"DataValues.NoData",NULL);
if (nodata!=NULL) m_parent_dataset->WMSSetNoDataValue(nodata);
const char *min=CPLGetXMLValue(TG,"DataValues.min",NULL);
if (min!=NULL) m_parent_dataset->WMSSetMinValue(min);
const char *max=CPLGetXMLValue(TG,"DataValues.max",NULL);
if (max!=NULL) m_parent_dataset->WMSSetMaxValue(max);
}
m_parent_dataset->WMSSetBandsCount(band_count);
m_parent_dataset->WMSSetDataType(GDALGetDataTypeByName(CPLGetXMLValue(TG, "DataType", "Byte")));
m_projection_wkt=CPLGetXMLValue(TG, "Projection","");
m_base_url=CPLGetXMLValue(TG,"OnlineResource.xlink:href",global_base_url);
if (m_base_url[0]=='\0') {
CPLError(ret=CE_Failure,CPLE_AppDefined, "%s%s",SIG,
"Can't locate OnlineResource in the server response.");
break;
}
// Bounding box, local, global, local lat-lon, global lat-lon, in this order
CPLXMLNode *bbox = CPLGetXMLNode(TG, "BoundingBox");
if (NULL==bbox) bbox=global_bbox;
if (NULL==bbox) bbox=CPLGetXMLNode(TG, "LatLonBoundingBox");
if (NULL==bbox) bbox=global_latlonbbox;
if (NULL==bbox) {
CPLError(ret=CE_Failure,CPLE_AppDefined,"%s%s",SIG,
"Can't locate the LatLonBoundingBox in server response.");
break;
}
m_data_window.m_x0=atof(CPLGetXMLValue(bbox,"minx","0"));
m_data_window.m_x1=atof(CPLGetXMLValue(bbox,"maxx","-1"));
m_data_window.m_y0=atof(CPLGetXMLValue(bbox,"maxy","0"));
m_data_window.m_y1=atof(CPLGetXMLValue(bbox,"miny","-1"));
if ((m_data_window.m_x1-m_data_window.m_x0)<0) {
CPLError(ret=CE_Failure,CPLE_AppDefined,"%s%s", SIG,
"Coordinate order in BBox, problem in server response");
break;
}
// Is there a palette?
//
// Format is
// <Palette>
// <Size>N</Size> : Optional
// <Model>RGBA|RGB|CMYK|HSV|HLS|L</Model> :mandatory
// <Entry idx=i c1=v1 c2=v2 c3=v3 c4=v4/> :Optional
// <Entry .../>
// </Palette>
// the idx attribute is optional, it autoincrements
// The entries are actually vertices, interpolation takes place inside
// The palette starts initialized with zeros
// HSV and HLS are the similar, with c2 and c3 swapped
// RGB or RGBA are same
//
GDALColorTable *poColorTable=NULL;
if ((band_count==1) && CPLGetXMLNode(TG,"Palette")) {
CPLXMLNode *node=CPLGetXMLNode(TG,"Palette");
int entries=static_cast<int>(getXMLNum(node,"Size","255"));
GDALPaletteInterp eInterp=GPI_RGB;
CPLString pModel=CPLGetXMLValue(node,"Model","RGB");
if (!pModel.empty() && pModel.find("RGB")!=std::string::npos)
eInterp=GPI_RGB;
else {
CPLError(CE_Failure, CPLE_AppDefined,
"%s Palette Model %s is unknown, use RGB or RGBA",
SIG, pModel.c_str());
return CE_Failure;
}
if ((entries>0)&&(entries<257)) {
int start_idx, end_idx;
GDALColorEntry ce_start={0,0,0,255},ce_end={0,0,0,255};
// Create it and initialize it to nothing
poColorTable = new GDALColorTable(eInterp);
poColorTable->CreateColorRamp(0,&ce_start,entries-1,&ce_end);
// Read the values
CPLXMLNode *p=CPLGetXMLNode(node,"Entry");
if (p) {
// Initialize the first entry
start_idx=static_cast<int>(getXMLNum(p,"idx","0"));
ce_start=GetXMLColorEntry(p);
if (start_idx<0) {
CPLError(CE_Failure, CPLE_AppDefined,
"%s Palette index %d not allowed",SIG,start_idx);
delete poColorTable;
return CE_Failure;
}
poColorTable->SetColorEntry(start_idx,&ce_start);
while (NULL!=(p=SearchXMLSiblings(p,"Entry"))) {
// For every entry, create a ramp
ce_end=GetXMLColorEntry(p);
end_idx=static_cast<int>(getXMLNum(p,"idx",CPLString().FormatC(start_idx+1).c_str()));
if ((end_idx<=start_idx)||(start_idx>=entries)) {
CPLError(CE_Failure, CPLE_AppDefined,
"%s Index Error at index %d",SIG,end_idx);
delete poColorTable;
return CE_Failure;
}
poColorTable->CreateColorRamp(start_idx,&ce_start,
end_idx,&ce_end);
ce_start=ce_end;
start_idx=end_idx;
}
}
m_parent_dataset->SetColorTable(poColorTable);
} else {
CPLError(CE_Failure, CPLE_AppDefined,"%s Palette definition error",SIG);
return CE_Failure;
}
}
int overview_count=0;
CPLXMLNode *Pattern=TG->psChild;
m_bsx=m_bsy=-1;
m_data_window.m_sx=m_data_window.m_sy=0;
for (int once=1;once;once--) { // Something to break out of
while ((NULL!=Pattern)&&(NULL!=(Pattern=SearchXMLSiblings(Pattern,"=TilePattern")))) {
int mbsx,mbsy;
CPLString request;
FindChangePattern(Pattern->psChild->pszValue,substs,keys,request);
char **papszTokens=CSLTokenizeString2(request,"&",0);
const char* pszWIDTH = CSLFetchNameValue(papszTokens,"WIDTH");
const char* pszHEIGHT = CSLFetchNameValue(papszTokens,"HEIGHT");
if (pszWIDTH == NULL || pszHEIGHT == NULL)
{
CPLError(ret=CE_Failure,CPLE_AppDefined,"%s%s",SIG,
"Cannot find width and/or height parameters.");
overview_count=0;
CSLDestroy(papszTokens);
break;
}
mbsx=atoi(pszWIDTH);
mbsy=atoi(pszHEIGHT);
if (m_projection_wkt.empty()) {
m_projection_wkt = CSLFetchNameValueDef(papszTokens,"SRS", "");
if (!m_projection_wkt.empty())
m_projection_wkt=ProjToWKT(m_projection_wkt);
}
if (-1==m_bsx) m_bsx=mbsx;
if (-1==m_bsy) m_bsy=mbsy;
if ((m_bsy!=mbsy)||(m_bsy!=mbsy)) {
CPLError(ret=CE_Failure,CPLE_AppDefined,"%s%s",SIG,
"Tileset uses different block sizes.");
overview_count=0;
CSLDestroy(papszTokens);
break;
}
double x,y,X,Y;
if (sscanf(CSLFetchNameValueDef(papszTokens,"BBOX", ""),"%lf,%lf,%lf,%lf",&x,&y,&X,&Y)!=4)
{
CPLError(ret=CE_Failure,CPLE_AppDefined,
"%s Error parsing BBOX, pattern %d\n",SIG,overview_count+1);
CSLDestroy(papszTokens);
break;
}
// Pick the largest size
int sx=static_cast<int>((m_data_window.m_x1-m_data_window.m_x0)/(X-x)*m_bsx);
int sy=static_cast<int>(fabs((m_data_window.m_y1-m_data_window.m_y0)/(Y-y)*m_bsy));
if (sx>m_data_window.m_sx) m_data_window.m_sx=sx;
if (sy>m_data_window.m_sy) m_data_window.m_sy=sy;
CSLDestroy(papszTokens);
// Only use overlays where the top coordinate is within a pixel from the top of coverage
double pix_off,temp;
pix_off=m_bsy*modf(fabs((Y-m_data_window.m_y0)/(Y-y)),&temp);
if ((pix_off<1)||((m_bsy-pix_off)<1)) {
requests=CSLAddString(requests,request);
overview_count++;
} else
CPLError(CE_Warning,CPLE_AppDefined,
"%s Overlay size %dX%d can't be used due to alignment",SIG,sx,sy);
Pattern=Pattern->psNext;
}
// The tlevel is needed, the tx and ty are not used by this minidriver
m_data_window.m_tlevel = 0;
m_data_window.m_tx = 0;
m_data_window.m_ty = 0;
// Make sure the parent_dataset values are set before creating the bands
m_parent_dataset->WMSSetBlockSize(m_bsx,m_bsy);
m_parent_dataset->WMSSetRasterSize(m_data_window.m_sx,m_data_window.m_sy);
m_parent_dataset->WMSSetDataWindow(m_data_window);
//m_parent_dataset->WMSSetOverviewCount(overview_count);
m_parent_dataset->WMSSetClamp(false);
// Ready for the Rasterband creation
for (int i=0;i<overview_count;i++) {
CPLString request=GetLowestScale(requests,i);
double scale=Scale(request);
// Base scale should be very close to 1
if ((0==i)&&(fabs(scale-1) > 1e-6)) {
CPLError(ret=CE_Failure,CPLE_AppDefined,"%s%s",SIG,
"Base resolution pattern missing.");
break;
}
// Prepare the request and insert it back into the list
// Find returns an answer relative to the original string start!
size_t startBbox=FindBbox(request);
size_t endBbox=request.find('&',startBbox);
if (endBbox==std::string::npos) endBbox=request.size();
request.replace(startBbox,endBbox-startBbox,"${GDAL_BBOX}");
requests = CSLInsertString(requests,i,request);
// Create the Rasterband or overview
for (int j = 1; j <= band_count; j++) {
if (i!=0)
m_parent_dataset->mGetBand(j)->AddOverview(scale);
else { // Base resolution
GDALWMSRasterBand *band=new
GDALWMSRasterBand(m_parent_dataset,j,1);
if (poColorTable!=NULL) band->SetColorInterpretation(GCI_PaletteIndex);
else band->SetColorInterpretation(BandInterp(band_count,j));
m_parent_dataset->mSetBand(j, band);
};
}
}
if ((overview_count==0)||(m_bsx<1)||(m_bsy<1)) {
CPLError(ret=CE_Failure,CPLE_AppDefined,
"%s No usable TilePattern elements found",SIG);
break;
}
}
}
CSLDestroy(keys);
CSLDestroy(substs);
if (tileServiceConfig) CPLDestroyXMLNode(tileServiceConfig);
if (psResult) CPLHTTPDestroyResult(psResult);
m_requests=requests;
return ret;
}
void GDALWMSMiniDriver_TiledWMS::GetCapabilities(GDALWMSMiniDriverCapabilities *caps) {
caps->m_capabilities_version = 1;
caps->m_has_arb_overviews = 0;
caps->m_has_image_request = 1;
caps->m_has_tiled_image_requeset = 1;
caps->m_max_overview_count = 32;
}
// not called
void GDALWMSMiniDriver_TiledWMS::ImageRequest(CPLString *url, const GDALWMSImageRequestInfo &iri) {
}
void GDALWMSMiniDriver_TiledWMS::TiledImageRequest(CPLString *url, const GDALWMSImageRequestInfo &iri, const GDALWMSTiledImageRequestInfo &tiri) {
*url = m_base_url;
URLAppend(url,CSLGetField(m_requests,-tiri.m_level));
URLSearchAndReplace(url,"${GDAL_BBOX}","%013.8f,%013.8f,%013.8f,%013.8f",
iri.m_x0,iri.m_y1,iri.m_x1,iri.m_y0);
URLAppend(url,m_end_url);
}
const char *GDALWMSMiniDriver_TiledWMS::GetProjectionInWKT() {
return m_projection_wkt.c_str();
}
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