使用Leafletjs显示PostGIS数据

本文介绍了使用Leafletjs显示PostGIS数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在使用PostGIS学习GIS，我想尝试一些有趣的东西，所以我从OSM下载了形状文件，在PostGres中导入了PostGIS扩展，现在我想用视觉表示PostGIS的数据。我已经使用查询拉取数据

I'm learning GIS with PostGIS and I wanted to try something funny so I downloaded shape files from OSM, imported in PostGres with PostGIS extension and now I want to represent data from PostGIS visually. I have Pulled data with Query

SELECT ST_AsGeoJSON(geom) FROM "dar-es-salaam_tanzania.land_coast;

我收到一堆GeoJSON并希望向用户展示它们。不幸的是它没有显示它。我使用Yii2来编写代码拉取数据。这是控制器代码：

I got bunch of GeoJSON and wanted to show them to user. Unfortunately it does not show it. I use Yii2 to write codes that pulls the data. Here is the controller code:

public function actionIndex()
{
    $cmd = Yii::$app->db->createCommand('SELECT ST_AsGeoJSON(geom) FROM "dar-es-salaam_tanzania.land_coast";');
    $gjsons = [];
    foreach($cmd->queryAll() as $row)
    {
        $gjsons[] = json_decode($row['st_asgeojson']);
    }
    return $this->render('index', ['geojson'=>json_encode($gjsons)]);
}

并且在视图中

<?php
/* @var $this yii\web\View */
$this->title = 'Map Application';

$this->registerJs("
    var map = L.map('map').setView([6.8000, 39.2833], 13);
    L.tileLayer('https://{s}.tiles.mapbox.com/v3/{id}/{z}/{x}/{y}.png', {
        maxZoom: 18,
        attribution: 'Map data &copy; <a href=\http://openstreetmap.org\">OpenStreetMap</a> contributors, ' +
            '<a href=\"http://creativecommons.org/licenses/by-sa/2.0/\">CC-BY-SA</a>, ' +
            'Imagery © <a href=\"http://mapbox.com\">Mapbox</a>',
        id: 'examples.map-20v6611k'
    }).addTo(map);
    var geojsonList = $geojson;
    L.geoJson(geojsonList).addTo(map);


"); 
?>
 <div id="map">
 </div>

是否有遗漏的东西？我是传单库的新手，我正在他们的网站上关注他们的教程

Is there something that am missing? I'm new to leaflet library and am following their tutorials on their site

更新

UPDATE

这是HTML输出（剥离的Geojson适合SO）是完整来源
注意我设置了地图的高度，我可以看到一个带有（+）和（ - ）符号的灰色框，但没有显示地图。

Here is the HTML Output (stripped Geojson to fit SO) here is full sourceNote that I set Height of the map and I can see a grey box with (+) and (-) signs on it but no map is shown.

<!DOCTYPE html>
<html lang="en-US">
<head>
    <title>Map Application</title>
    <link href="/tech/maps-app/web/assets/7edc4543/css/bootstrap.css" rel="stylesheet">
    <link href="/tech/maps-app/web/css/site.css" rel="stylesheet">
    <link href="/tech/maps-app/web/css/map.css" rel="stylesheet">
    <link href="/tech/maps-app/web/leafletjs/leaflet.css" rel="stylesheet"></head>
<body>

    <div class="wrap">
        <div id="map">
        </div> 
    </div>

</script><script src="/tech/maps-app/web/assets/c29e8e0a/jquery.js"></script>
<script src="/tech/maps-app/web/assets/f3e1524/yii.js"></script>
<script src="/tech/maps-app/web/leafletjs/leaflet.js"></script>
<script src="/tech/maps-app/web/assets/7edc4543/js/bootstrap.js"></script>
<script type="text/javascript">
    jQuery(document).ready(function () {

        var map = L.map('map').setView([6.8000, 39.2833], 13);
        L.tileLayer('https://{s}.tiles.mapbox.com/v3/{id}/{z}/{x}/{y}.png', {
            maxZoom: 18,
            attribution: 'Map data &copy; <a href=\http://openstreetmap.org">OpenStreetMap</a> contributors, ' +
                '<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
                'Imagery © <a href="http://mapbox.com">Mapbox</a>',
            id: 'examples.map-20v6611k'
        }).addTo(map);
        var geojsonList = [{"type":"MultiPolygon","coordinates":[[[[39.094989013528,-7.2022471828125],[38.638288027056,-7.2022471828125],[38.638288027056,-6.638130390625],[39.094989013528,-6.638130390625],[39.094989013528,-7.2022471828125]]]]}];
        L.geoJson(geojsonList).addTo(map);



    });
</script>
</body>
</html>

Postgis

使用Leafletjs显示PostGIS数据

问题描述

推荐答案