Philippe Rivière Fil

## .block
license: mit

## .block
license: gpl-3.0
height: 600
border: no

## .block
license: mit

## .block
license: gpl-3.0
border: no
height: 484

## .block
height: 650

## point_in_polygon.php
<?php


/* is (lon, lat) inside the polygon $p?
 * use ray casting algorithm (http://en.wikipedia.org/wiki/Point_in_polygon)
 * ie. project a horizontal line from our point to each segment
 * code adapted from http://stackoverflow.com/questions/14149099/raycasting-algorithm-with-gps-coordinates
 */
function inside_polygon($test_point, $points) {

## .block
license: gpl-3.0

## .block
license: mit

## .block
license: mit

## README.md

      
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                Fil
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              Last active
              March 28, 2021 11:49
            
              
                A conformal Airocean
              
          
    A stand-alone version of https://observablehq.com/@fil/a-conformal-airocean
Built with blockbuilder.org
	<?php


	/* is (lon, lat) inside the polygon $p?
	* use ray casting algorithm (http://en.wikipedia.org/wiki/Point_in_polygon)
	* ie. project a horizontal line from our point to each segment
	* code adapted from http://stackoverflow.com/questions/14149099/raycasting-algorithm-with-gps-coordinates
	*/
	function inside_polygon($test_point, $points) {