PHP Classes

Esri Grid: Parse Esri Grid ASCII GIS files

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esrigrid 1.0.9GNU General Publi...5.2PHP 5, Geography, Parsers
Description 

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This class can parse Esri Grid ASCII GIS files.

It can open and parse an ASCII file defined the Esri grid format with attributes like elevation and surface slope within a grid that is associated to a rectangle in a certain geographic area.

The class can traverse the file to extract the information within a rectangle given its start and end X and Y coordinates.

It can handle large grid files like the SRTM 90m Digital Elevation Data.

The class can invoke a callback function that can process the attribute values for each position in the selected grid area.

Innovation Award
PHP Programming Innovation award nominee
November 2013
Number 8
Esri grid files are files that can be used to describe terrain attributes for a given geographic region.

This class can parse Esri grid files to extract the details of the information they contain.

Manuel Lemos
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Innovation award
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Details

# Esri ARC/INFO ASCII GRID reader Designed to handle large files. Tested with SRTM 90m Digital Elevation Data: http://srtm.csi.cgiar.org/. ## Usage ### Single tile handling ```php <?php use infojunkie\EsriGrid; $max = -99999; $min = 100000; $file = new GridFile('test_dem1.txt'); $grid = $file->getGridFromPoints(0, 0, 140, 230, 'calc_stats'); echo "max: $max, min: $min\n"; var_dump($grid); function calc_stats($x, $y, $elevation) { global $max, $min; echo "$x, $y: $elevation\n"; if (!is_null($elevation)) { $max = max($max, $elevation); $min = min($min, $elevation); } } ?> ``` ### Multiple tile handling ```php <?php use infojunkie\EsriGrid; $files = new GridFiles(array( 'test_dem1.txt', 'test_dem2.txt', 'test_dem3.txt', 'test_dem4.txt', 'test_dem5.txt', 'test_dem6.txt', )); $grid = $files->getGridFromPoints(175, 225, 325, 675, 'calc_stats'); echo "max: $max, min: $min\n"; var_dump($grid); ?> ```

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  Files folder image Files  /  lib  /  infojunkie  /  EsriGrid  
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  Plain text file Exception.php Class Auxiliary script
  Plain text file GridFile.php Class Class source
  Plain text file GridFiles.php Class Class source

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  Accessible without login Plain text file BasicTest.php Test Unit test script

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