/**
* Download srtm files for a specific latitude and longitude.
* @param int $lat
* @param int $lng
*/
function download_srtm_for($lat, $lon)
{
global $config;
$base_url = 'http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/';
$srtm_directory = get_srtm_directory() . "/";
$fname = srtm::get_filename($lat, $lon);
$zip_fname = $fname . '.zip';
$regions = array('Africa', 'Australia', 'Eurasia', 'Islands', 'North_America', 'South_America');
/*
* Search file in all regions
*/
foreach ($regions as $region) {
if (!($srtm_data = @file_get_contents($base_url . '/' . $region . '/' . $zip_fname))) {
continue;
}
file_put_contents($srtm_directory . $zip_fname, $srtm_data);
if (!($zip = zip_open($srtm_directory . $zip_fname))) {
die("Cannot unzip file \"" . $srtm_directory . $zip_fname . "\"\n");
}
while ($e = zip_read($zip)) {
if (zip_entry_name($e) !== $fname) {
continue;
}
zip_entry_open($zip, $e, "r");
$uncompressed = zip_entry_read($e, zip_entry_filesize($e));
file_put_contents($srtm_directory . $fname, $uncompressed);
zip_close($zip);
unlink($srtm_directory . $zip_fname);
return true;
}
}
die("Cannot find tile for {$lat},{$lon}\" in any region.\n");
}
<?php
require_once dirname(__FILE__) . '/../../globals/classes/srtm.php';
// Calculate needed files
$needed_files = array();
$bounds = $_SESSION['config']['map']['bounds'];
for ($lat = floor($bounds['min_latitude']); $lat <= ceil($bounds['max_latitude']); $lat += 1) {
// Clamp
if ($lat > 90) {
$lat = -90;
}
for ($lng = floor($bounds['min_longitude']); $lng <= ceil($bounds['max_longitude']); $lng += 1) {
// clamp
if ($lng > 180) {
$lng = -180;
}
$fname = srtm::get_filename($lat, $lng);
$needed_files[$fname] = array('exists' => file_exists(dirname(__FILE__) . '/../../files/srtm/' . $fname), 'lat' => $lat, 'lng' => $lng);
}
}
$web_folders = array('Africa', 'Australia', 'Eurasia', 'Islands', 'North_America', 'South_America');
if (!extension_loaded('zip') || !function_exists('zip_open')) {
show_error('You need <strong>"zip"</strong> extension to download srtm files.');
return true;
}
echo '<ul class="srtm">';
foreach ($needed_files as $fname => $data) {
echo '<li data-lat="' . $data['lat'] . '" data-lng="' . $data['lng'] . '" class="' . ($data['exists'] ? 'existing' : 'missing') . '">' . '<span>' . $fname . '</span></li>';
}
echo '</ul>';
echo '<div style="clear: both;"> </div>';
?>
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
ini_set('max_execution_time', 300);
header('Content-Type: application/json');
require_once dirname(__FILE__) . '/../globals/classes/srtm.php';
if (!isset($_GET['lat']) || !isset($_GET['lng'])) {
return;
}
$base_url = 'http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/';
$srtm_directory = dirname(__FILE__) . '/../files/srtm/';
$fname = srtm::get_filename((int) $_GET['lat'], (int) $_GET['lng']);
$zip_fname = $fname . '.zip';
$regions = array('Africa', 'Australia', 'Eurasia', 'Islands', 'North_America', 'South_America');
/*
* Search file in all regions
*/
foreach ($regions as $region) {
if (!($srtm_data = @file_get_contents($base_url . '/' . $region . '/' . $zip_fname))) {
continue;
}
file_put_contents($srtm_directory . $zip_fname, $srtm_data);
if (!($zip = zip_open($srtm_directory . $zip_fname))) {
echo json_encode(array('result' => '500', 'error' => 'cannot unzip'));
return;
}
while ($e = zip_read($zip)) {
