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DennisOSRM 2011-12-31 15:58:42 +01:00
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commit 53d87eb9be
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218
Util/SRTMImport/NASAGridSquare.cpp
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/*
Copyright (c) 2006 Alex Tingle
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "NASAGridSquare.h"
NasaGridSquare::~NasaGridSquare() {
if(data)
unload();
}
std::string NasaGridSquare::make_filename(const char* ext) const
{
using namespace std;
char EW =(longitude>=0?'E':'W');
char NS =(latitude>=0?'N':'S');
stringstream ss;
#ifdef ROOT_PATH
static const char* root_path =ROOT_PATH;
#else
static const char* root_path =FloodUtils::getenvz("ROOT_PATH",".");
#endif
ss<<setfill('0')
<< root_path
<< "/"
<<NS
<<setw(2)<<abs(latitude)<<setw(0)
<<EW
<<setw(3)<<abs(longitude)<<setw(0)
<<'.'<<ext;
return ss.str();
}
void NasaGridSquare::parse_filename(const char* filename, int& lng, int& lat)
{
char fn[12]; // N51E001.xyz
FloodUtils::strlcpy(fn,filename,sizeof(fn));
lng=( fn[3]=='E'? 1: -1 );
lat=( fn[0]=='N'? 1: -1 );
fn[3]=fn[7]='\0';
lng *= ::atoi(fn+4);
lat *= ::atoi(fn+1);
}
void NasaGridSquare::load(const char* filename) {
const std::string gzipfile =std::string(filename)+".zip";
bool triedZipped =false;
std::cout << "testing for zipped file " << gzipfile << std::endl;
if(FloodUtils::exists(gzipfile.c_str())) {
std::cout << gzipfile << " exists" << std::endl;
}
int errorcode = 0;
int errorcode2 = 0;
zip * test = zip_open(gzipfile.c_str(), 0, &errorcode);
if(errorcode) {
char buffer[1024];
zip_error_to_str(buffer, 1024, errorcode, errno);
ERR("Error occured opening zipfile " << filename << ", error: " << buffer);
} else {
unsigned entries = zip_get_num_files(test);
INFO("File has " << entries << " entries");
//for(unsigned i = 0; i < entries; ++i) {
struct zip_stat stat;
//ZIP_EXTERN int zip_stat_index(struct zip *, int, int, struct zip_stat *);
zip_stat_index(test, 0, 0, &stat);
INFO("included: " << stat.name);
INFO("uncompressed: " << stat.size);
INFO("compressed: " << stat.comp_size);
// }
DELETE(data2);
data2 = new char[stat.size];
zip_file * file = zip_fopen_index(test, 0, 0 );
INFO("opened");
zip_file_error_get(file, &errorcode, &errorcode2);
INFO("opened: " << errorcode << ", " << errorcode2);
zip_fread(file, data2, stat.size);
INFO("read");
zip_fclose(file);
INFO("closed file");
unsigned short datum=((unsigned short*)data2)[493093];
short result=(datum>>8 | datum<<8);
INFO("493093: " << result);
}
zip_close(test);
while(true) {
fd=::open(filename,O_RDONLY);
if(fd>=0)
break;
DEBUG_ONLY(int saved_errno =errno;)
if(ENOENT!=errno || triedZipped || !FloodUtils::exists(gzipfile.c_str())) {
DB("Failed to open file "<<filename<<": "<<::strerror(saved_errno))
return;
}
// Unzip and try again
DB("Unzipping "<<gzipfile)
std::cout << "unzipping" << std::endl;
std::stringstream ss;
ss<<"/bin/gzip -dc "<<gzipfile<<" > "<<filename;
int status =::system(ss.str().c_str());
if(-1 == status)
{
ERR("Failed to execute shell command ("<<ss.str()<<"): "<<::strerror(errno));
exit(-1);
}
else if(0 != WEXITSTATUS(status))
{
ERR("Failed to unzip file "<<gzipfile<<": "<<WEXITSTATUS(status));
exit(-1);
}
triedZipped=true;
}
// Get file length
struct stat file_stat;
if( ::fstat(fd,&file_stat)<0 )
{
::perror("fstat error");
::exit(-1);
}
num_bytes=file_stat.st_size;
if(!num_bytes)
{
::close(fd);
return;
}
data =::mmap(0,num_bytes,PROT_READ,MAP_SHARED,fd,0);
if(MAP_FAILED==data)
{
::perror("mmap error");
::exit(-1);
}
}
void NasaGridSquare::unload()
{
if(::munmap(data,num_bytes)<0)
{
::perror("munmap error");
::exit(-1);
}
::close(fd);
}
bool NasaGridSquare::lngLat_to_colRow(
float lng_fraction, float lat_fraction,
unsigned int& col, unsigned int& row
) const
{
col = int( 0.5 + lng_fraction * float(num_cols-1) );
row =num_rows-1 - int( 0.5 + lat_fraction * float(num_rows-1) );
return( col<num_cols && row<num_rows );
}
NasaGridSquare::NasaGridSquare(const char* filename):
data(NULL), data2(NULL), longitude(0), latitude(0),
fd(-1), num_bytes(0), num_rows(1), num_cols(1)
{
parse_filename(filename,longitude,latitude);
load(filename);
if(has_data())
num_rows=num_cols=std::sqrt(num_bytes/2);
}
NasaGridSquare::NasaGridSquare(int lng, int lat) :
data(NULL), data2(NULL), longitude(lng), latitude(lat),
fd(-1), num_bytes(0), num_rows(1), num_cols(1)
{
std::string filename =make_filename("hgt");
std::cout << "Loading " << filename << std::endl;
load(filename.c_str());
if(has_data())
num_rows=num_cols=std::sqrt(num_bytes/2);
}
short NasaGridSquare::height(float lng_fraction, float lat_fraction) const {
if(!data)
return NO_DATA;
unsigned int col,row;
if(!lngLat_to_colRow(lng_fraction,lat_fraction, col,row))
return NO_DATA;
return getHeight(col,row);
}
short NasaGridSquare::getHeight(unsigned int col, unsigned int row) const {
if(col>=num_cols || row>=num_rows)
return NO_DATA;
unsigned int i=( col + row * num_cols );
// unsigned short datum=((unsigned short*)data)[i];
// short result=(datum>>8 | datum<<8);
unsigned short datum2=((unsigned short*)data2)[i];
short result2=(datum2>>8 | datum2<<8);
// INFO("[" << i << "] result: " << result << ", result2: " << (int)result2);
return result2;
}

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Util/SRTMImport/NASAGridSquare.h
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/*
Copyright (c) 2006 Alex Tingle
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef NASA_GRID_SQUARE_H
#define NASA_GRID_SQUARE_H
#include <string>
#include <zip.h>
#include "utils.h"
#include <cmath>
#include <iostream>
#include <string>
#include "utils.h"
#include <errno.h>
#include <fcntl.h>
#include <iomanip>
#include <sstream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "../../typedefs.h"
class NasaGridSquare {
public:
NasaGridSquare(const char* filename);
NasaGridSquare(int lng, int lat);
~NasaGridSquare();
short height(float lng_fraction, float lat_fraction) const;
const static short NO_DATA =-32768; ///< NASA's magic number for no data.
/** Formula for grid squares' unique keys. */
static int key(int lng, int lat) {
return 1000*lat + lng;
}
/** Calculate unique key for this object. */
int key() const {return key(longitude,latitude);}
unsigned int cols() const {return num_cols;}
unsigned int rows() const {return num_rows;}
bool has_data() const {return bool(data);}
private:
void* data; ///< mmap'd data file.
char * data2;
int longitude;
int latitude;
int fd; ///< File ID for mmap'd data file.
unsigned int num_bytes; ///< Length of data.
unsigned int num_rows;
unsigned int num_cols;
std::string make_filename(const char* ext) const;
void parse_filename(const char* filename, int& lng, int& lat);
/** Loads the file into memory, pointed to by 'data'. Sets num_bytes. */
void load(const char* filename);
void unload();
/** Converts lng,lat floats to col,row ints. Returns TRUE if result valid. */
bool lngLat_to_colRow(
float lng_fraction, float lat_fraction,
unsigned int& col, unsigned int& row
) const;
short getHeight(unsigned int col, unsigned int row) const;
friend class ReducedGridSquare;
}; // end class NasaGridSquare
#endif // NASA_GRID_SQUARE_H

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Util/SRTMImport/SRTMLookup.h
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/*
Copyright (c) 2006 Alex Tingle
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef GRID_H
#define GRID_H
#include "NASAGridSquare.h"
#include <boost/unordered_map.hpp>
#include <assert.h>
/** Interface to the GridSquares. Template parameter determines which kind of
* raw data is used (NASA, or reduced). GridSquare data is globally cached, so
* that many queries can be answered without having to constantly mmap & unmmap
* the data files.
*
* Typical usage:
*
* Grid<NasaGridSquare> g();
* cout << g.height(lng,lat) << endl;
*
*/
template<class T>
class Grid {
static boost::unordered_map<int,T*> cache;
static typename boost::unordered_map<int,T*>::size_type cache_size;
public:
/** The cache_limit defaults to 360. Adjust it to set the number of
* grid squares to store in memory. */
static typename boost::unordered_map<int,T*>::size_type cache_limit;
Grid(short sea_level_rise_ = 0 ) : sea_level_rise(sea_level_rise_) {
// Double check that this compiler truncates towards zero.
assert(-1 == int(float(-1.9)));
}
/** Returns the height above sea level for the given lat/lng. */
short height(float longitude, float latitude) const {
int lng,lat;
float lng_fraction,lat_fraction;
split(longitude,lng,lng_fraction);
split(latitude ,lat,lat_fraction);
int k =T::key(lng,lat);
typename boost::unordered_map<int,T*>::iterator pos =cache.find(k);
if(pos==cache.end())
{
if(cache_size>=cache_limit)
clear_cache();
pos = cache.insert(std::make_pair(k,new T(lng,lat))).first;
if(pos->second->has_data())
++cache_size;
}
return pos->second->height(lng_fraction,lat_fraction);
}
/** Returns TRUE if the given lng/lat is underwater. */
bool underwater(float longitude, float latitude) const
{
short h =height(longitude,latitude);
return( h!=NasaGridSquare::NO_DATA && h<=sea_level_rise );
}
private:
/** Clears the cache of non-null GridSquares. */
void clear_cache() const {
cache.clear();
}
/** Split a floating point number (num) into integer (i) & fraction (f)
* components. */
void split(float num, int& i, float& f) const {
if(num>=0.0)
i=int(num);
else
i=int(num)-1;
f=num-float(i);
}
short sea_level_rise;
};
template<class T> boost::unordered_map<int,T*> Grid<T>::cache;
template<class T> typename boost::unordered_map<int,T*>::size_type Grid<T>::cache_size =0;
template<class T> typename boost::unordered_map<int,T*>::size_type Grid<T>::cache_limit=360;
#endif // GRID_H

137
Util/SRTMImport/utils.cpp
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/*
Copyright (c) 2006 Alex Tingle
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "utils.h"
#include <fstream>
#include <iostream>
#include <cmath>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
namespace FloodUtils {
unsigned short sqrt(unsigned long a) {
return std::sqrt(a);
}
std::list<std::string> split(const std::string& s, char token) {
std::list<std::string> result;
std::string::size_type pos=0;
while(true)
{
pos=s.find_first_not_of(token,pos);
if(pos==std::string::npos) break;
std::string::size_type token_pos=s.find_first_of(token,pos);
result.push_back( s.substr(pos,token_pos-pos) );
pos=token_pos;
}
return result;
}
void googleXY_to_latlng(
double x, double y, int zoom,
double& lng, double& lat
)
{
googleX_to_lng(zoom,x,lng);
googleY_to_lat(zoom,y,lat);
}
void googleX_to_lng(int zoom, double x, double& lng)
{
long tilesAtThisZoom =googleMaxTiles(zoom);
lng = -180.0 + (x * 360.0 / double(tilesAtThisZoom));
}
void googleY_to_lat(int zoom, double y, double& lat)
{
// This function is the inverse Mercator projection.
// Look up 'Mercator projection' on Wikipedia for details.
long pixels = googleMaxTiles(zoom) * 256L;
double pixelsPerLonRadian = pixels / (2.0 * M_PI);
double bitmapOrigo = pixels / 2;
double Y = (bitmapOrigo - y*256) / pixelsPerLonRadian;
double latRad = 2.0 * ::atan( ::exp(Y) ) - M_PI_2;
lat = latRad * 180.0 / M_PI;
}
/*
* Implementation copyright (C) 2004, Alex Tingle.
*/
size_t strlcpy(char* dst, const char* src, size_t bufsize)
{
size_t srclen =strlen(src);
size_t result =srclen; /* Result is always the length of the src string */
if(bufsize>0)
{
if(srclen>=bufsize)
srclen=bufsize-1;
if(srclen>0)
memcpy(dst,src,srclen);
dst[srclen]='\0';
}
return result;
}
size_t strlcat(char* dst, const char* src, size_t bufsize)
{
size_t dstlen =strlen(dst);
size_t srclen =strlen(src);
size_t result =dstlen+srclen;
/* truncate srclen to the buffer */
if(result>=bufsize)
srclen=bufsize-dstlen-1;
if(srclen>0) /* if there is anything left to copy. */
{
dst+=dstlen;
memcpy(dst,src,srclen);
dst[srclen]='\0';
}
return result;
}
int getpid()
{
return int(::getpid());
}
const char* getenvz(const char* name, const char* dflt)
{
const char* result =::getenv(name);
if(!result)
result=dflt;
return result;
}
bool exists(const char* path) {
std::ifstream ifile(path);
return ifile;
}
} // end namespace FloodUtils

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Util/SRTMImport/utils.h
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/*
Copyright (c) 2006 Alex Tingle
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef FLOOD_UTILS_H
#define FLOOD_UTILS_H
#include <string.h>
#include <sstream>
#include <stdio.h>
#include <string>
#include <list>
/*
#define ERR(x) { \
std::stringstream s; \
s<<FloodUtils::getpid()<<": "<<x<<"\n"; \
fprintf(stderr,s.str().c_str()); \
}
*/
#define ROOT_PATH "/opt/storage/srtm/Eurasia"
#if DEBUG_OUTPUT
# define DEBUG_ONLY(x) x
# define DB(x) ERR("[DEBUG] "<<x)
#else
# define DEBUG_ONLY(x)
# define DB(x)
#endif
namespace FloodUtils {
/** Integer square root.
* Algorithm by Jack W. Crenshaw: http://www.embedded.com/98/9802fe2.htm
*/
unsigned short sqrt(unsigned long a);
/** Tokenise a string. */
std::list<std::string> split(const std::string& s, char token=',');
void googleXY_to_latlng(
double x, double y, int zoom,
double& lng, double& lat
);
void googleX_to_lng(int zoom, double x, double& lng);
void googleY_to_lat(int zoom, double y, double& lat);
/** Calculate the number of tiles in x or y dimensions at a zoom level. */
inline long googleMaxTiles(int zoom) { return( 1L << (17 - zoom) ); }
/* Specs. & semantics from:
* http://www.courtesan.com/todd/papers/strlcpy.html
*/
size_t strlcpy(char* dst, const char* src, size_t bufsize);
size_t strlcat(char* dst, const char* src, size_t bufsize);
/** Convenience function for debug output */
int getpid();
/** Convenience function for getting env vars as strings. */
const char* getenvz(const char* name, const char* dflt ="");
/** Check for the existence of the names file. */
bool exists(const char* path);
}
#endif // FLOOD_UTILS_H

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Util/SRTMLookup/NASAGridSquare.cpp
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/*
open source routing machine
Copyright (C) Dennis Luxen, others 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU AFFERO General Public License as published by
the Free Software Foundation; either version 3 of the License, or
any later version.
This program 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 Affero General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
or see http://www.gnu.org/licenses/agpl.txt.
*/
#include "NASAGridSquare.h"
NasaGridSquare::~NasaGridSquare() {
DELETE(elevationMap);
}
std::string NasaGridSquare::make_filename(const char* ext) const {
char EW =(longitude>=0 ? 'E' : 'W' );
char NS =(latitude >=0 ? 'N' : 'S');
std::stringstream ss;
ss<<setfill('0')
<< ROOT_PATH
<< "/"
<<NS
<<setw(2)<<abs(latitude)<<setw(0)
<<EW
<<setw(3)<<abs(longitude)<<setw(0)
<<'.'<<ext;
return ss.str();
}
void NasaGridSquare::load(const char* filename) {
const std::string gzipfile =std::string(filename)+".zip";
std::cout << "testing for zipped file " << gzipfile << std::endl;
if(exists(gzipfile.c_str())) {
std::cout << gzipfile << " exists" << std::endl;
}
int errorcode = 0;
int errorcode2 = 0;
zip * test = zip_open(gzipfile.c_str(), 0, &errorcode);
if(errorcode) {
char buffer[1024];
zip_error_to_str(buffer, 1024, errorcode, errno);
ERR("Error occured opening zipfile " << filename << ", error: " << buffer);
//TODO: Load from URL
return;
}
unsigned entries = zip_get_num_files(test);
INFO("File has " << entries << " entries");
struct zip_stat stat;
zip_stat_index(test, 0, 0, &stat);
INFO("included: " << stat.name);
INFO("uncompressed: " << stat.size);
INFO("compressed: " << stat.comp_size);
num_bytes = stat.size;
DELETE(elevationMap);
elevationMap = new char[stat.size];
zip_file * file = zip_fopen_index(test, 0, 0 );
zip_file_error_get(file, &errorcode, &errorcode2);
zip_fread(file, elevationMap, stat.size);
zip_fclose(file);
zip_close(test);
}
bool NasaGridSquare::lngLat_to_colRow(float lng_fraction, float lat_fraction, unsigned int& col, unsigned int& row) const {
col = int( 0.5 + lng_fraction * float(numCols-1) );
row = numRows-1 - int( 0.5 + lat_fraction * float(numRows-1) );
return( col<numCols && row<numRows );
}
NasaGridSquare::NasaGridSquare(int lng, int lat, std::string & _rp) : ROOT_PATH(_rp), elevationMap(NULL), longitude(lng), latitude(lat), num_bytes(0), numRows(1), numCols(1) {
std::string filename =make_filename("hgt");
std::cout << "Loading " << filename << std::endl;
load(filename.c_str());
if(hasData())
numRows=numCols=std::sqrt(num_bytes/2);
}
short NasaGridSquare::getHeight(float lng_fraction, float lat_fraction) const {
if(!hasData())
return NO_DATA;
unsigned int col,row;
if(!lngLat_to_colRow(lng_fraction,lat_fraction, col,row))
return NO_DATA;
if(col>=numCols || row>=numRows)
return NO_DATA;
unsigned int i=( col + row * numCols );
unsigned short datum2=((unsigned short*)elevationMap)[i];
short result2=(datum2>>8 | datum2<<8);
return result2;
}

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Util/SRTMLookup/NASAGridSquare.h
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/*
open source routing machine
Copyright (C) Dennis Luxen, others 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU AFFERO General Public License as published by
the Free Software Foundation; either version 3 of the License, or
any later version.
This program 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 Affero General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
or see http://www.gnu.org/licenses/agpl.txt.
*/
#ifndef NASA_GRID_SQUARE_H
#define NASA_GRID_SQUARE_H
#include "../ProjectionUtils.h"
#include "../../typedefs.h"
#include <cmath>
#include <string>
#include <sstream>
#include <cstdio>
#include <cstring>
#include <fstream>
#include <iostream>
#include <zip.h>
class NasaGridSquare {
public:
const static short NO_DATA =-32768; ///< NASA's magic number for no data.
NasaGridSquare(int lng, int lat, std::string & _rp);
~NasaGridSquare();
short getHeight(float lng_fraction, float lat_fraction) const;
bool hasData() const {return bool(elevationMap != NULL);}
private:
std::string ROOT_PATH;
char * elevationMap;
int longitude;
int latitude;
unsigned int num_bytes; ///< Length of data.
unsigned int numRows;
unsigned int numCols;
std::string make_filename(const char* ext) const;
/** Loads the file into memory, pointed to by 'data'. Sets num_bytes. */
void load(const char* filename);
/** Converts lng,lat floats to col,row ints. Returns TRUE if result valid. */
bool lngLat_to_colRow(float lng_fraction, float lat_fraction, unsigned int& col, unsigned int& row) const;
inline bool exists(const char* path) {
std::ifstream ifile(path);
return ifile;
}
};
#endif // NASA_GRID_SQUARE_H

87
Util/SRTMLookup/SRTMLookup.h
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@ -1,87 +0,0 @@
/*
open source routing machine
Copyright (C) Dennis Luxen, others 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU AFFERO General Public License as published by
the Free Software Foundation; either version 3 of the License, or
any later version.
This program 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 Affero General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
or see http://www.gnu.org/licenses/agpl.txt.
** Interface to the GridSquares. Template parameter determines which kind of
* raw data is used (NASA, or reduced). GridSquare data is globally cached, so
* that many queries can be answered without having to constantly mmap & unmmap
* the data files.
*
* Typical usage:
*
* Grid<NasaGridSquare> g();
* cout << g.height(lng,lat) << endl;
*
*/
#ifndef SRTMLOOKUP_H
#define SRTMLOOKUP_H
#include <cassert>
#include <string>
#include "NASAGridSquare.h"
#include "../../DataStructures/LRUCache.h"
class SRTMLookup {
public:
SRTMLookup(std::string & _rp) : cache(MAX_CACHE_SIZE), ROOT_PATH(_rp) {
// Double check that this compiler truncates towards zero.
assert(-1 == int(float(-1.9)));
}
/** Returns the height above sea level for the given lat/lng. */
short height(const float longitude, const float latitude) {
if(0 == ROOT_PATH.size())
return 0;
int lng,lat;
float lng_fraction,lat_fraction;
split(longitude,lng,lng_fraction);
split(latitude ,lat,lat_fraction);
int k = key(lng,lat);
if(!cache.Holds(k)) {
cache.Insert(k , new NasaGridSquare(lng,lat, ROOT_PATH));
}
NasaGridSquare * result;
cache.Fetch(k, result);
return result->getHeight(lng_fraction,lat_fraction);
}
private:
/** Split a floating point number (num) into integer (i) & fraction (f)
* components. */
inline void split(float num, int& i, float& f) const {
if(num>=0.0)
i=int(num);
else
i=int(num)-1;
f=num-float(i);
}
/** Formula for grid squares' unique keys. */
int key(int lng, int lat) {
return 1000*lat + lng;
}
LRUCache<NasaGridSquare*> cache;
static const int MAX_CACHE_SIZE = 250;
std::string ROOT_PATH;
};
#endif // SRTMLOOKUP_H