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<?php |
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namespace Smindel\GIS\Model; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\Core\Injector\Injectable; |
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use Smindel\GIS\GIS; |
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class Raster |
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{ |
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use Configurable; |
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use Injectable; |
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private static $tile_renderer = 'raster_renderer'; |
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protected $filename; |
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protected $info; |
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public function __construct($filename = null) |
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{ |
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$this->filename = $filename; |
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} |
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public function getFilename() |
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{ |
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return $this->filename ?: $this->config()->full_path; |
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} |
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public function getSrid() |
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{ |
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if (empty($this->info['srid'])) { |
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$cmd = sprintf(' |
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gdalsrsinfo -o wkt %1$s', |
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$this->getFilename() |
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); |
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$output = `$cmd`; |
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if (preg_match('/\WAUTHORITY\["EPSG","([^"]+)"\]\]$/', $output, $matches)) { |
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$this->info['srid'] = $matches[1]; |
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} |
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} |
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return $this->info['srid']; |
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} |
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public function getLocationInfo($geo = null, $band = null) |
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{ |
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$cmd = sprintf(' |
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gdallocationinfo -wgs84 %1$s %2$s %3$s', |
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$band ? sprintf('-b %d', $band) : '', |
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$this->getFilename(), |
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$geo ? sprintf('%f %f', ...GIS::reproject(GIS::to_array($geo), 4326)['coordinates']) : '' |
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); |
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$output = `$cmd`; |
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if (preg_match_all('/\sBand\s*(\d+):\s*Value:\s*([\d\.\-]+)/', $output, $matches)) { |
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$bands = array_combine($matches[1], $matches[2]); |
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array_walk($bands, function(&$item){ |
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$item = (int)$item; |
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}); |
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return $bands; |
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} |
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} |
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public function translateRaster($topLeftGeo, $bottomRightGeo, $width, $height, $destFileName = '/dev/stdout') |
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{ |
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$topLeftGeo = GIS::to_array($topLeftGeo); |
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$bottomRightGeo = GIS::to_array($bottomRightGeo); |
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$cmd = sprintf(' |
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gdal_translate -of PNG -q -projwin %1$f, %2$f, %3$f, %4$f -outsize %5$d %6$d %7$s %8$s', |
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$topLeftGeo['coordinates'][0], $topLeftGeo['coordinates'][1], |
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$bottomRightGeo['coordinates'][0], $bottomRightGeo['coordinates'][1], |
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$width, $height, |
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$this->getFilename(), |
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$destFileName |
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); |
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return `$cmd`; |
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} |
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public function searchableFields() |
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{ |
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return [ |
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'Band' => 'Band', |
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]; |
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} |
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} |
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smindel /
silverstripe-gis
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