Openlayers: Unsupported GeoJSON type: undefined
来源： https://stackoverflow.com/questions/59177194/openlayers-unsupported-geojson-type-undefined
OpenLayers
Openlayers: Unsupported GeoJSON type: undefined
来源： https://stackoverflow.com/questions/59177194/openlayers-unsupported-geojson-type-undefined
OpenLayers apply old feature style
来源： https://stackoverflow.com/questions/62815165/openlayers-apply-old-feature-style
Draw great circle line on the map directly in OpenLayers 5?
问题 Is it possible to draw the great circle line in the OpenLayers 5 directly, without splitting the LineString into many small parts like https://openlayers.org/en/latest/examples/flight-animation.html? Here is the problem of user experience related to the usage of the great circle line. The Modify Feature(https://openlayers.org/en/latest/examples/modify-test.html?q=Test) is provided. The number of the editable points in the great circle line is more than that in the direct line. The user have
GIS基础知识
最近接手一个GIS项目，需要用到 PostGIS，GeoServer，OpenLayers 等工具组件，遇到一堆地理信息相关的术语名词，在这里做一个总结。 1. 大地测量学 (Geodesy) 大地测量学 是一门量测和描绘地球表面的学科，也包括确定地球重力场和海底地形。 1.1 大地水准面 (geoid) 大地水准面 是 海洋表面 在排除风力、潮汐等其它影响，只考虑重力和自转影响下的形状，这个形状延伸过陆地，生成一个密闭的曲面。虽然我们通常说地球是一个球体或者椭球体，但是由于地球引力分布不均（因为密度不同等原因），大地水准面是一个不规则的光滑曲面。虽然不规则，但是可以近似地表示为一个椭球体，这个椭球体被 称为 参考椭球体（Reference ellipsoid） 。大地水准面相对于参考椭球体的高度被称为 Undulation of the geoid 。这个波动并不是非常大，最高在冰岛为85m，最低在印度南部为 −106 m，一共不到200m。下图来自 维基百科 ，表示 EGM96 geoid 下不同地区的 Undulation。 1.2 参考椭球体（Reference ellipsoid） 参考椭球体（Reference ellipsoid） 是一个数学上定义的地球表面，它近似于大地水准面。因为是几何模型，可以用长半轴、短半轴和扁率来确定。我们通常所说的经度
Adding map markers to Open Layers 6
问题 My question is simple: How do you add a marker at a specific longitude and latitude? Working through the open layers example page I have created a new map with a marker. I added the marker using the new ol.Feature but it seems no matter what I set the coordinates to the marker position will not change . Please can anyone offer advice on why the map marker is not showing in the correct position? const iconFeature = new ol.Feature({ geometry: new ol.geom.Point([53, -2]), //This marker will not
Adding map markers to Open Layers 6
问题 My question is simple: How do you add a marker at a specific longitude and latitude? Working through the open layers example page I have created a new map with a marker. I added the marker using the new ol.Feature but it seems no matter what I set the coordinates to the marker position will not change . Please can anyone offer advice on why the map marker is not showing in the correct position? const iconFeature = new ol.Feature({ geometry: new ol.geom.Point([53, -2]), //This marker will not
Mouse passthrough to OpenLayers using WPF
问题 I am currently trying to update a map within a program from OpenLayers 3 to 6.3.1 in a WPF window. However im getting a problem where the mouse isn't passed through to the map. The software I'm working on draws a bunch of edges over a roadmap (using Basemap) to show the capacity/utilization at a given time and calculates ideal routes and stuff (similar to Google Maps). When I click on the map it should show me the avaiable data to the nearest edge in a second window, the methods for this are
Mouse passthrough to OpenLayers using WPF
问题 I am currently trying to update a map within a program from OpenLayers 3 to 6.3.1 in a WPF window. However im getting a problem where the mouse isn't passed through to the map. The software I'm working on draws a bunch of edges over a roadmap (using Basemap) to show the capacity/utilization at a given time and calculates ideal routes and stuff (similar to Google Maps). When I click on the map it should show me the avaiable data to the nearest edge in a second window, the methods for this are
OpenLayers Map addLayer and getLayers methods dealing with custom layer types
问题 I am extending LayerGroup and TileLayer classes to include an id property that I need to identify a specific layer/group of layers (this also reflects an id of a layer DIV in the DOM). Example for TileLayer : export class OperationalLayer extends TileLayer { id: String; constructor(url: string, name: string, id: string) { const source = new TileWMS({ params: {'LAYERS': name}, url: url, }); super({source: source}); this.id = id; } } I also have another class which extends the ol Map class.