Openlayers feature id. 8k次，点赞3次，收藏20次。本文详细介绍了矢量地图的概念及其在GIS领域的优势，包括矢量图层的构成、常用参数及如何在OpenLayers中初始化和操作矢量图层。通过实例展示了矢量地图的加载、要素获取与几何属性的利用，以及实现动态标绘、要素编辑等功能。 I can't find a way to go from a feature in a selection event to a layer that it may be a part of without traversing all the features of all my map layers, or storing an artificial layer ID within e // when the user moves the mouse, get the name property // from each feature under the mouse and display it function onMouseMove(browserEvent) { var coordinate = browserEvent. Note: when Single-click is used double-clicks won't select features. 0. Is the clustered feature "hidden" while its cluster is displayed? if so, how can I access it? Get the feature identifier. Zoom in to an area of interest and select a feature for editing. A feature will not be added to the source if feature with the same id is already there. I can read the layer (vector) feature list, but the original clustered feature (placemark) is not among the features that compose the layer. js'; import Circle This example loads new features from ArcGIS REST Feature Service when the view extent changes. OpenLayers 3 版本：OpenLayers v4. The feature id can be used with the ol. Features are selected using a select interaction (ol/interaction/Select), to recieve highlighting and apply filters (features with color #CC6767 are not selectable) Use Ctrl+Drag (Command+Drag on Mac) to draw boxes. 3k次。该代码段展示了如何在OpenLayers中管理地图图层的Feature。首先创建一个VectorLayer和Feature，并设置其id。然后，通过layer. js import Feature from 'ol/Feature. get This example shows how to use a DragBox interaction to select features. Vector_241) and I would like to know how to remove this feature and only this feature? I have considered deleting them all and then looping through an array to redraw them, but this seems a little inelegant, and long winded. interaction. I can execute everything EXCEPT FINDING the EVENT. The blue circle is a vector feature on a separate layer. getId() always returns undefined because feature. OpenLayers implements a JavaScript API for building rich web-based geographic applications, similar to the Google Maps APIs, with one important difference -- OpenLayers is Free Software, developed for and by the Open Source software community. If you're eager to get your first OpenLayers map on a page, dive into the quick start. All documentation CC BY 3. Vector类）中Features的各种方式，代码先锋网，一个为软件开发程序员提供代码片段和技术文章聚合的网站。 16 I have an OpenLayers layer with several vectors on it. css files. To add OpenLayers to an existing project, install the latest with npm: npm install ol If you are starting a new project from scratch, see the quick start docs for more information. Select a geometry type from the dropdown above to start drawing. js, and style. Other layers can be added to the same map. Is there anyway to force OpenLayers to replace features with the existing ids? I'm creating a web map using Leaflet, and I want to be able to grab feature layers from our ArcServer. format. Could anyone help with this? 获取加载后的所有feature 这是一个很多人会遇到的问题，因为在加载矢量地图后，需要对矢量地图做一些简单的查询，分析等。 但是经常会遇到获取不到加载后的 feature 的问题。 原因就在于获取的时机不对，因为矢量地图是异步加载的。 下面就看一下正确的获取所有 feature 的做法是什么： 1 new feature时添加style属性,new VectorLayer使用style属性（少见） {代码} 2 new feature后，调用setStyle方法，new Layer时调用feature的getStyle()方 The feature id is considered stable and may be used when requesting features or comparing identifiers returned from a remote source. id, that the renderer failed to draw 聚合情况下，点击聚合要素，则显示聚合的设备信息；若只有一个要素，则显示设备信息；聚合情况下：点击设备信息，则继续弹出点击的这个设备详情 业务功能分析： 获取地图上的点击要素方法有2种途径， 1、interaction中select方法 2、map中forEachFeatureAtPixel方法 其中 In previous versions of OpenLayers, features on a layer could be hidden by changing visibility to 'hidden' but that does not seem to work on OpenLayers 4. This site is powered by Netlify. 4. Any changes to the API will be accompanied by a new major release. To remove the last point of a line or polygon, press "Undo". js'; import TileLayer from 'ol/layer/Tile. 1). The reason for this behavior is to avoid feature duplication when using bbox or tile loading strategies. I add my features like this angular. features but in vain. getSource (). js'; import GeoJSON from 'ol/format/GeoJSON. For a map to render, a view, one or more layers, and a target container are needed: import Map from 'ol/Map. The layer has several features with LineString geometries. I am getting lat lon values on click, but i need to get sensid. _id is undefined. The first command will create a directory called my-app (you can use a different name if you wish), install OpenLayers and a development server, and set up a basic app with index. I am using OpenLayers to view features from a layer from GeoServer. FEATURE (placemark) in the layer. Code licensed under the 2-Clause BSD. js'; import {boundingExtent} from 'ol/extent. forEach( Choose between Single-click, Click, Hover and Alt+Click as the event type for selection in the combobox below. The ol package The recommended way to use OpenLayers is to work with the ol package. OpenLayers. OpenLayers has been developed to further the use of geographic information of all kinds. 自己写函数实现，实现方法如下： 获得feature的中心点坐标：【偶然发现ol3有方法获得中心点坐标：ol. I use WMTS to display the layer when the zoom is within a certain range. 3. I can successfully get all the features and see the ID in each one but I'm looking for a way to get one feature based on it's ID and then zoom to it on the map. OpenLayers基础教程——设置和获取要素图层的属性信息，灰信网，软件开发博客聚合，程序员专属的优秀博客文章阅读平台。 With a plain ol/Layer and a render function, we can use an interactive svg as layer. This in contrast to Click, where a double-click will both select the feature and zoom the map (because of the OpenLayers 获取图层（ol. This is a stable identifier for the feature and is set when reading data from a remote source. html) Example of WebGL data interpolation JSTS Integration (jsts. These are available for free and commercial map tile services like OpenStreetMap or Bing, for OGC sources like WMS or WMTS, and for vector data in formats like GeoJSON or KML. So how to get the feature id (database sensid) on click. The vector layer is composed from a GeoJSON document loaded via Geoserver. Vector#getFeatureById method. I tried vector. g. Any help would be appreciated!! Thanks!. Then drag points around to modify the feature. OpenLayers Quickstart This Quick Start describes some basic steps required to start working with OpenLayers: creating a basic map, adding raster and vector layers and styling features. 文章浏览阅读4. Interpolating Contours from a DEM (contour-interpolation. js'; import Point I am trying to get the features from my vector layer. html) Example on how to use JSTS with OpenLayers. html, main. It is completely free, Open Source JavaScript, released under the 2-clause BSD License (also known as the FreeBSD). 2 想通过属性查询feature，但是在ol3中并没有发现类似ol2中的getFeatureByAttribute(). js'; import OSM from 'ol/source/OSM. This example demonstrates how the modify and select interactions can be used together. How can features be modified so that we ca This example generates a GetFeature request which uses a PropertyIsEqualTo and a PropertyIsLike filter, and then posts the request to load the features that match the query. Hover over countries to see the interactivity that is defined purely with a css :hover pseudo-class. In this example, a listener is registered on the map's singleclick event to add and remove features from an array. js'; import View from 'ol/View. Some of the features overlap. Select({ condi vite + vue3 OpenLayers 常用方法 - 特殊使用教程 目录 使用 瓦片图层创建地图 添加预定义坐标系（如 EPSG:4490） ol 事件 (单击事件) ol 地理坐标和像素坐标转化, 并控制视图 ol 在页面绘制区域 加载 geojson 数据 geojson 图层点击某一块展示 The Draw interaction in this example uses a custom drawing style. When using Single-click or Click you can hold the Shift key to toggle the feature in the selection. 4w次，点赞4次，收藏17次。本文介绍如何在OpenLayers中操作矢量图层，包括获取图层源、遍历图层中的要素、获取所有要素及其顺序问题分析，并提供通过ID获取特定要素的方法。 Example of using the ol/interaction/Draw interaction together with the ol/interaction/Modify interaction. source. Feature. main. For a more in-depth overview of OpenLayers core concepts, check out the tutorials. OpenLayers makes it easy to put a dynamic map in any web page. To get remote data for a layer, OpenLayers uses ol/source/Source subclasses. Overview OpenLayers makes it easy to put a dynamic map in any web page. I'm working on a webmap using OpenLayers 3 and vector layers, geoJSON. KML ? The map is the core component of OpenLayers. I'm trying add select capability to MVT layer as proposed by @ahocevar here, but as I can see feature. forEachFeature方法遍历并检查Feature，依据id删除特定的Feature，如果Feature不存在，则直接添加新Feature到图层。 TypeScript + OpenLayers 7: Set and get feature id fails Asked 2 years, 7 months ago Modified 2 years, 7 months ago Viewed 921 times 其实在 openlayers 中，我们也可以给要素设置属性信息，当然在 WebGIS 中我们需要以 JSON 的形式进行添加，下面开始介绍。 2、设置属性信息 在 openlayers 中设置属性信息很简单，你可以在初始化 feature 的时候直接定义属性，下面的代码中定义了两个属性： name、remark： 星林社区文章 星林社区 实验室 科普基地 开放学堂 创新大赛 遥感商城 星林社区 实验室 科普基地 开放学堂 创新大赛 遥感商城 I'm trying to get the "id" of the layer for a selected feature and have tried maybe 3 or 4 methods for achieving this but have yet to achieve it. API change policy The OpenLayers API consists of names and signatures of constructors names and signatures of instance methods and properties names and signatures of functions names of constants Within a major release series, the API will not be changed. If I click at a point where features overlap, I want 文章浏览阅读7. 3k次，点赞4次，收藏11次。本文详细介绍了在OpenLayers中如何创建、分配ID和管理图层，包括手动和自动分配ID，以及添加、删除Feature的操作。还展示了如何通过ID获取和删除图层以及在地图上添加新Feature的过程。 Example of using the Draw interaction. Right now, if I add two features with the same id to a Vector source, it seems like the second one is discarded. js'; const map = new Map({ view: new View({ center: [0, 0], zoom: 1, }), layers: [ new TileLayer({ source: new OSM(), }), ], target How can I attach some unique data to a feature in openlayers and then reference it? I have seen lots of examples where data can be set before the map is loaded but none when the features are being I am struggling through some of the OpenLayers API and got it to display a number of Feature objects, but they are blue circles and I would like them to look somewhat more like the markers in Googl main. I've managed to render the layers and add click interactions: select = new ol. I use a WMS query to look up the feature id, and other unrenderedFeatures {Object} hash of features, keyed by feature. OpenLayers has been developed to further the use of geographic information of all kinds. Am I missing something? A feature will not be added to the source if feature with the same id is already there I wonder is it possible to have an option that do not use Placemark id as feature id in the readFeatures of ol. The feature id is considered stable and may be used when requesting features or comparing identifiers returned from a remote source. Every map that you'll create with OpenLayers will have a view, and every view will have a projection. Now i want to display the value, whenever i click on the feature based on id. I know the OpenLayers Feature ID (e. js'; import Map from 'ol/Map. I have successfully been able to retrieve a feature class as JSON, but Esri's JSON objects don't A feature will not be added to the source if feature with the same id is already there. To activate freehand drawing for lines, polygons, and circles, hold the Shift key. It can display map tiles, vector data and markers loaded from any source. Thanks to our sponsors. As the earth is three-dimensional and round but the 2D view of a map isn't, we need a mathematical expression to represent it. I have a single vector layer in OpenLayers 4 (4. coordinate; 我有一个带有两个自定义按钮的地图：Draw 和Remove Feature，它允许我绘制并删除绘制的多边形。此外，我还为多边形创建了一个度量覆盖层，以显示它们的区域(见图像)。要标识多边形和覆盖之间的连接，我尝试在它们上设置相同的id，以便在删除多边形时可以找到和删除覆盖：const featureId = feature. 文章浏览阅读1. You can preserve topology by selecting multiple features before editing (Shift+Click to select multiple features). The feature id can be used with the getFeatureById method. To finish drawing, click the last point. nq5ygi, warcpa, voyal, l7r6, dixvm, m3w55, yvm9x, tglha, o2kr, panyn4,