辅助解码GEOjson文件

Question

提前感谢您抽出时间协助我。

我有一个 geojson 文件，我正在尝试根据每个数组属性中的标签使用 php 脚本对其进行解码。例如，有六个类别被标记：

高 多学科治疗 ENH SLGT MRGL TSTM

我想做的是将这个文件分解为每个类别和关联的坐标正逗号空格，然后返回负逗号空格，然后返回一行，然后返回下一个坐标，直到该类别的数组完整为止。在该类别的末尾，我需要放置 END:，然后放置一个新行并重新开始该过程，直到处理完所有类别。

以下是输出示例：

"Marginal Risk"
30.48, -80.86
30.73, -82.03
31.14, -82.82
32.74, -82.82
33.87, -83.38
34.50, -83.21
35.33, -82.23
35.64, -81.15
35.58, -80.27
34.58, -78.98
34.11, -78.18
33.84, -77.43
End:

"General Risk"
29.10, -80.01
29.31, -82.96
29.84, -83.95
29.86, -85.02
30.61, -85.80
31.55, -85.96
32.90, -85.58
34.01, -85.17
35.13, -85.23
36.42, -85.35
37.10, -85.14
38.65, -83.20
39.21, -81.77
39.27, -79.95
39.74, -78.60
40.70, -77.85
42.74, -74.88
43.22, -73.25
44.08, -72.13
45.35, -70.09
45.32, -68.87
43.88, -67.73
23.92, -82.05
24.93, -80.46
26.81, -79.58
End:

网址如下： https://www.spc.noaa.gov/products/outlook/archive/2023/day1otlk_20230331_1630_cat.lyr.geojson

我编写了代码将其提取出来，以便我可以看到数组。

<?php
// Define the URL
$url = "https://www.spc.noaa.gov/products/outlook/archive/2023/day1otlk_20230331_1630_cat.lyr.geojson";
// Use cURL to fetch the data
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);

// Check if the request was successful
if ($response === false) {
    echo "Failed to retrieve data: " . curl_error($ch);
} else {
    // Close the cURL handle
    curl_close($ch);

    // Parse the JSON response
    $data = json_decode($response, true);
echo '<pre>' . print_r($data, true) . '</pre>';
}

?>

这是我尝试解码它的代码的开始：

<?php
// URL of the GeoJSON file
$url = 'https://www.spc.noaa.gov/products/outlook/archive/2023/day1otlk_20230331_1630_cat.lyr.geojson';

// Get the GeoJSON data
$data = file_get_contents($url);

// Decode the JSON data
$json_data = json_decode($data, true);

// Iterate over the features in the GeoJSON data
foreach ($json_data['features'] as $feature) {
    // Get the LABEL2 value
    $label2 = $feature['properties']['LABEL2'];
    
    // Get the coordinates
    $coordinates = $feature['geometry']['coordinates'];
    
    // Convert coordinates array to string and remove brackets
    $coordinates_string = json_encode($coordinates, JSON_PRETTY_PRINT );
    
    // Print the LABEL2 value and coordinates
    echo 'LABEL2: ' . $label2 . ', coordinates: ' . $coordinates_string . "\n";
}
?>

任何帮助将不胜感激。

谢谢！

Answer 1

这是我的尝试

<?php
// URL of the GeoJSON file
$url = 'https://www.spc.noaa.gov/products/outlook/archive/2023/day1otlk_20230331_1630_cat.lyr.geojson';

// Get the GeoJSON data
$data = file_get_contents($url);

// Decode the JSON data
$json_data = json_decode($data, true);

// Iterate over the features in the GeoJSON data
$string="";
foreach ($json_data['features'] as $feature) {
    // Get the LABEL2 value
    $label2 = $feature['properties']['LABEL2'];
    $string.=$label2. "\n";

    foreach ($feature['geometry']['coordinates'][0][0] as $coordinates) {
        $string.=$coordinates[1] .",".$coordinates[0]. "\n";
    }


    // Convert coordinates array to string and remove brackets
    $string.= "End:"."\n\n";

}
echo $string;
file_put_contents('data.txt', $string);
?>

这是一个更新脚本，其中坐标未显示。任何帮助将不胜感激。

<?php
// Define the URL
$url = "https://www.spc.noaa.gov/products/outlook/archive/2023/day1otlk_20230331_1630_cat.lyr.geojson";

// Use cURL to fetch the data
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);

// Check if the request was successful
if ($response === false) {
    echo "Failed to retrieve data: " . curl_error($ch);
} else {
    // Close the cURL handle
    curl_close($ch);

    // Parse the JSON response
    $data = json_decode($response, true);

    // Check if JSON decoding was successful
    if ($data !== null) {
        $formattedCoordinates = array();

        // Extract coordinates from the GeoJSON data
        foreach ($data['features'] as $feature) {
            $label = $feature['properties']['LABEL'];
            $formattedCoordinates[] = "\"$label\"";
            $geometry = $feature['geometry'];
            $coordinates = extractCoordinates($geometry['coordinates']);
            $formattedCoordinates[] = formatCoordinates($coordinates);
        }

        // End with "End:"
        $formattedCoordinates[] = "End:";

        // Output the formatted coordinates
        echo implode("\n", $formattedCoordinates);
    } else {
        echo "Failed to decode JSON data.";
    }
}

// Function to extract coordinates
function extractCoordinates($coordinates) {
    $coords = array();
    foreach ($coordinates as $coord) {
        $lat = $coord[1];
        $lon = $coord[0];
        $coords[] = "$lat, $lon";
    }
    return $coords;
}

// Function to format coordinates as specified
function formatCoordinates($coordinates) {
    return implode("\n", $coordinates);
}
?>