95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
/*
|
|
|
|
EXAMPLE osmium_location_cache_create
|
|
|
|
Reads nodes from an OSM file and writes out their locations to a cache
|
|
file. The cache file can then be read with osmium_location_cache_use.
|
|
|
|
Warning: The locations cache file will get huge (>32GB) if you are using
|
|
the DenseFileArray index even if the input file is small, because
|
|
it depends on the *largest* node ID, not the number of nodes.
|
|
|
|
DEMONSTRATES USE OF:
|
|
* file input
|
|
* location indexes and the NodeLocationsForWays handler
|
|
* location indexes on disk
|
|
|
|
SIMPLER EXAMPLES you might want to understand first:
|
|
* osmium_read
|
|
* osmium_count
|
|
* osmium_road_length
|
|
|
|
LICENSE
|
|
The code in this example file is released into the Public Domain.
|
|
|
|
*/
|
|
|
|
#include <cerrno> // for errno
|
|
#include <cstdlib> // for std::exit
|
|
#include <cstring> // for strerror
|
|
#include <fcntl.h> // for open
|
|
#include <iostream> // for std::cout, std::cerr
|
|
#include <string> // for std::string
|
|
#include <sys/stat.h> // for open
|
|
#include <sys/types.h> // for open
|
|
|
|
#ifdef _WIN32
|
|
# include <io.h> // for _setmode
|
|
#endif
|
|
|
|
// Allow any format of input files (XML, PBF, ...)
|
|
#include <osmium/io/any_input.hpp>
|
|
|
|
// For the location index. There are different types of index implementation
|
|
// available. These implementations put the index on disk. See below.
|
|
#include <osmium/index/map/dense_file_array.hpp>
|
|
#include <osmium/index/map/sparse_file_array.hpp>
|
|
|
|
// For the NodeLocationForWays handler
|
|
#include <osmium/handler/node_locations_for_ways.hpp>
|
|
|
|
// For osmium::apply()
|
|
#include <osmium/visitor.hpp>
|
|
|
|
// Chose one of these two. "sparse" is best used for small and medium extracts,
|
|
// the "dense" index for large extracts or the whole planet.
|
|
using index_type = osmium::index::map::SparseFileArray<osmium::unsigned_object_id_type, osmium::Location>;
|
|
//using index_type = osmium::index::map::DenseFileArray<osmium::unsigned_object_id_type, osmium::Location>;
|
|
|
|
// The location handler always depends on the index type
|
|
using location_handler_type = osmium::handler::NodeLocationsForWays<index_type>;
|
|
|
|
int main(int argc, char* argv[]) {
|
|
if (argc != 3) {
|
|
std::cerr << "Usage: " << argv[0] << " OSM_FILE CACHE_FILE\n";
|
|
std::exit(1);
|
|
}
|
|
|
|
const std::string input_filename{argv[1]};
|
|
const std::string cache_filename{argv[2]};
|
|
|
|
// Construct Reader reading only nodes
|
|
osmium::io::Reader reader{input_filename, osmium::osm_entity_bits::node};
|
|
|
|
// Initialize location index on disk creating a new file.
|
|
const int fd = ::open(cache_filename.c_str(), O_RDWR | O_CREAT | O_TRUNC, 0666); // NOLINT(hicpp-signed-bitwise)
|
|
if (fd == -1) {
|
|
std::cerr << "Can not open location cache file '" << cache_filename << "': " << std::strerror(errno) << "\n";
|
|
std::exit(1);
|
|
}
|
|
#ifdef _WIN32
|
|
_setmode(fd, _O_BINARY);
|
|
#endif
|
|
index_type index{fd};
|
|
|
|
// The handler that stores all node locations in the index.
|
|
location_handler_type location_handler{index};
|
|
|
|
// Feed all nodes through the location handler.
|
|
osmium::apply(reader, location_handler);
|
|
|
|
// Explicitly close input so we get notified of any errors.
|
|
reader.close();
|
|
}
|
|
|