Openlayers:从请求加载坐标数据
Openlayers: Load coordinate-data from request
我想从 http 请求加载坐标数据并将其绘制为线串。
到目前为止我有:
var coordinates = [[30.433333,19.066667], [30.732778,19.704444],[30.832778,19.84444]];
var featurestreet=new ol.Feature({
geometry: new ol.geom.LineString(coordinates),
name: 'xyz'
});
但现在我想从这样的文件中加载矢量数据:
var stree = new ol.layer.Vector({
source: new ol.source.Vector(
{
url: 'points.txt',
format: new ol.format.GPX(), //what format to use here?
name:'stree'
})
});
map.addLayer(stree);
正确的格式是什么?我想让它非常简单和压缩,所以我不想在这个数据中使用任何放大的 xml-代码。
最好将坐标包装为 GeoJSON:
{ "type": "FeatureCollection", "features": [ { "type": "Feature", "geometry": { "type": "LineString", "coordinates":
[[30.433333,19.066667], [30.732778,19.704444],[30.832778,19.84444]]
} } ] }
如果您的 .txt 文件只包含坐标数组,您可以像 http://openlayers.org/en/v4.6.5/apidoc/ol.source.Vector.html 中一样使用自定义加载程序,并将 GeoJSON 页眉和页脚字符串添加到 xhr.responseText in vectorSource.getFormat() .readFeatures()
要在 GeoJSON 中包含名称:
{ "type": "FeatureCollection", "features": [ { "type": "Feature", "properties": { "name": "xyz" }, "geometry": { "type": "LineString", "coordinates":
[[30.433333,19.066667], [30.732778,19.704444],[30.832778,19.84444]]
} } ] }
我想从 http 请求加载坐标数据并将其绘制为线串。
到目前为止我有:
var coordinates = [[30.433333,19.066667], [30.732778,19.704444],[30.832778,19.84444]];
var featurestreet=new ol.Feature({
geometry: new ol.geom.LineString(coordinates),
name: 'xyz'
});
但现在我想从这样的文件中加载矢量数据:
var stree = new ol.layer.Vector({
source: new ol.source.Vector(
{
url: 'points.txt',
format: new ol.format.GPX(), //what format to use here?
name:'stree'
})
});
map.addLayer(stree);
正确的格式是什么?我想让它非常简单和压缩,所以我不想在这个数据中使用任何放大的 xml-代码。
最好将坐标包装为 GeoJSON:
{ "type": "FeatureCollection", "features": [ { "type": "Feature", "geometry": { "type": "LineString", "coordinates":
[[30.433333,19.066667], [30.732778,19.704444],[30.832778,19.84444]]
} } ] }
如果您的 .txt 文件只包含坐标数组,您可以像 http://openlayers.org/en/v4.6.5/apidoc/ol.source.Vector.html 中一样使用自定义加载程序,并将 GeoJSON 页眉和页脚字符串添加到 xhr.responseText in vectorSource.getFormat() .readFeatures()
要在 GeoJSON 中包含名称:
{ "type": "FeatureCollection", "features": [ { "type": "Feature", "properties": { "name": "xyz" }, "geometry": { "type": "LineString", "coordinates":
[[30.433333,19.066667], [30.732778,19.704444],[30.832778,19.84444]]
} } ] }