geojson | 易学教程

How to load Open layers 3 geojson vector layer with bbox?

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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由翻译强力驱动问题: I am struggling with building OL3 Vector layer BBOX strategy loading. So far I can easily load Geojson file with valid json syntax, however this is one time strategy. My another approach was to use ol.ServerVector which to my understading returns Javascript with callback, but I can't make it work. Working simple Geojson layer: var vectorSource = new ol . source . GeoJSON ( ({ projection : 'EPSG:3857' , preFeatureInsert : function ( feature ) { feature . geometry . transform ( 'EPSG:4326' , 'EPSG:3857' ); }, url : 'geojson2.json' })

Export leaflet map to geojson

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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is it possible to export geojson from leaflet to save the map state? I want to store the markers, zoom & map center to load it later. There is plenty of ways to load geojson on leaflet, but I can't figure out any option to export the map to geojson... 回答1: There's no "out-of-the-box" option to export all the markers on the map to GeoJSON but it's something you can do easily do yourself. Leaflet's L.Marker has a toGeoJSON method: Returns a GeoJSON representation of the marker (GeoJSON Point Feature). http://leafletjs.com/reference.html#marker

Export geoJSON data from Google Maps

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Is there built-in support or any library to export geoJSON data from the google.maps.Data layer or google.maps.Data.Feature or google.maps.Data.Geometry or even using Marker , Polyline and Polygon .I have code like this,for example: var point=new google.maps.Data.Point(m.getPosition()); activeFeature.setGeometry(point); console.log(activeFeature.getGeometry()); equiLayer.add(activeFeature); I would like to export this data to the server as geojson.Something like the toGeoJson method in leaflet ? Dr.Molle A sample-function: google.maps.Map.prototype.getGeoJson=function(callback){ var geo={"type

使用GeoJSON和Leaflet

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GeoJSON正在成为许多GIS技术和服务中非常流行的数据格式 - 它非常简单，轻量级，简单明了，Leaflet在处理它方面非常出色。在本例中，您将学习如何创建从 GeoJSON 对象创建的地图矢量并与其交互。关于GeoJSON 根据 http://geojson.org ： GeoJSON是用于编码各种地理数据结构的格式。 GeoJSON对象可以表示几何，特征或特征的集合。 GeoJSON支持以下几何类型：Point，LineString，Polygon，MultiPoint，MultiLineString，MultiPolygon和GeometryCollection。 GeoJSON中的功能包含几何对象和附加属性，功能集合表示功能列表。 Leaflet支持上述所有GeoJSON类型，但 Feature 和 FeatureCollections的效果最好，因为它们允许您使用一组属性来描述要素。我们甚至可以使用这些属性来设计我们的Leaflet矢量。以下是一个简单的GeoJSON功能的例子： var geojsonFeature = { "type" : "Feature" , "properties" : { "name" : "Coors Field" , "amenity" : "Baseball Stadium" , "popupContent" :

openlayers官方教程（三）Vector Data――Rendering GeoJSON

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Rendering GeoJSON 渲染GeoJson数据，以工程文件夹下data/countries.json为例，来导入此GeoJson数据并渲染。首先，编辑index.xml <!DOCTYPE html> < html > < head > < meta charset = "utf-8" > < title > OpenLayers </ title > < style > html , body , #map-container { margin : 0 ; height : 100% ; width : 100% ; font-family : sans-serif; background-color : #04041b ; } </ style > </ head > < body > < div id = "map-container" > </ div > </ body > </ html > 下面开始导入矢量数据的三个重要元素： ―format 读取和渲染的格式 ―vector source 导入数据源和管理空间要素 ―vector layer 用于渲染要素的图层更新main.js来载入和渲染本地的GeoJSON几何要素： import 'ol/ol.css' ; import GeoJSON from 'ol/format/GeoJSON' ;

爬取智图GEOQ网站数据并将geojson转为shp

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爬取智图GEOQ网站数据并转为shp 爬取智图上的人口数据 Geojsonתshp 爬取智图上的人口数据进入智图官方网站 https://www.geoq.cn/ 注册并登陆点击左上角的 Editor 进入爬取数据的页面可以在界面右方看到网站给出的各类poi及各种数据这些数据在爬取下来后为Geojson格式 json文件经过转化后可在Arcgis上使用 Geojsonתshp 部分后续将提及爬取网站部分详情可看中原百科作者写的 https://blog.csdn.net/qq_32231883/article/details/88778609 点开其主页可查看更多关于爬取智图网站的内容随后将爬取下来的json文件按如下Geojson的格式进行修改 GeoJSON特征集合： { “type”: “FeatureCollection”, “features”: [{ “type”: “Feature”, “geometry”: { “type”: “Point”, “coordinates”: [102.0, 0.5] }, “properties”: { “prop0”: “value0” } }, { “type”: “Feature”, “geometry”: { “type”: “LineString”, “coordinates”: [[102.0, 0.0]

Process huge GEOJson file with jq

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问题 Given a GEOJson file as follows:- { "type": "FeatureCollection", "features": [ { "type": "Feature", "properties": { "FEATCODE": 15014 }, "geometry": { "type": "Polygon", "coordinates": [ ..... I want to end up with the following:- { "type": "FeatureCollection", "features": [ { "tippecanoe : {"minzoom" : 13}, "type": "Feature", "properties": { "FEATCODE": 15014 }, "geometry": { "type": "Polygon", "coordinates": [ ..... ie. I have added the tippecanoe object to each feature in the array

leaflet map, getting specific data of geojson file with button

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问题 I'm triying to display on my map specific value ( data.geojson) of my geojson file with buttons. (for exemple to plot a map with only value "domaine":"violences ") I am loocking for a way to rely my data ("domaine":"violences" or other)with a buttons on my map ? Thanks so much in advance for your time. my js: <script type="text/javascript"> var map = L.map('map'); var terrainTiles = L.tileLayer('http://stamen-tiles-{s}.a.ssl.fastly.net/toner-lite/{z}/{x}/{y}.{ext}', { attribution: 'Map tiles

Map with d3.js and TopoJSON, Albers Siberia projection

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I'm trying to make a Choropleth with d3.js but I got stucked just at the beginning. I found a Shapefile and generated GeoJSON and TopoJson files from it just like here . The map uses Albers-Siberia projection. What I found about this projection: Projection: Albers Equal-Area Conic Units: Meters Spheroid: Krasovsky Central meridian: 105 Standard Parallel 1: 52 Standard Parallel 2: 64 Reference Latitude: 0 False Easting: 18500000 False Northing: 0 PROJ.4: +proj=aea +lat_1=52 +lat_2=64 +lat_0=0 +lon_0=105 +x_0=18500000 +y_0=0 +ellps=krass +units=m +towgs84=28,-130,-95,0,0,0,0 +no_defs MapInfo:

D3 stop and restart transition along path to allow click through to geo data coordinates

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问题 Hi I’m trying to use D3 to pause and resume a transition of a marker along a path like this example D3 tween - pause and resume controls plus stop the marker's transition on a particular data point like this D3 transition along segments of path and pause at coordinate values. I am starting the transition by clicking on the marker and would like to be able to stop it and then restart it when it is clicked – at the moment it pauses for a period and then starts. I’d like to be able to stop the

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