geojson

How to set the zIndex layer order for geoJson layers?

由 不打扰是莪最后的温柔 提交于 2020-01-21 03:20:53
问题 I would like to have certain layers to be always on top of others, no matter in which order they are added to the map. I am aware of bringToFront() , but it does not meet my requirements. I would like to set the zIndex dynamically based on properties. Leaflet has the method setZIndex() , but this apparently does not work for geoJson layers: https://jsfiddle.net/jw2srhwn/ Any ideas? 回答1: Cannot be done for vector geometries. zIndex is a property of HTMLElement s, and vector geometries (lines

在Microsoft Power BI中创建地图的10种方法

由 最后都变了- 提交于 2020-01-20 04:42:00
今天，我们来简单聊一聊“地图”。 在我们日常生活中，地图地位已经提升的越来越高，出门聚餐、驾驶、坐车、旅行......应运而生的就是各种Map APP。 作为数据分析师，我们今天不讲生活地图，要跟大家叨叨的当然是我们最关心的是：怎样选择合适的Power BI的可视化“地图”。本文主要介绍10种地图的优缺点，其中有 四个 本地地图可以直接在Power BI Desktop中访问，而无需导入它们。有 四个 自定义视觉效果可供导入，还有 两个 属于“自己创建”的。 1. 原生—ESRI ArcGIS地图 ArcGIS Maps for Power BI于2016年9月在预览版中发布。其开发人员 ESRI凭借其ArcGIS系列产品成为地理空间软件和空间数据的领导者。有几个独特的功能，例如您当前无法通过任何其他Power BI地图获得的驱动时间半径和群集。自推出以来，已经有了一些改进。 优点 由GIS软件的领导者ESRI创建和维护 各种背景/底图，如Dark，Light，OpenStreetMap和Streets 驱动时间和距离半径的选项 放大或缩小时进行聚类的选项 查看热图 ArcGIS Online中的参考图层 内置信息图表，其中包含在地图上移动时更新的数据 缺点 除非首先将自定义形状添加到ArcGIS Online并公开共享，然后将其用作Power BI中的参考图层

通过原型对象prototype创建openlayers扩展库

由 爱⌒轻易说出口 提交于 2020-01-19 15:16:08
在openlayers前端开发中，对于一些常用的方法，我们会考虑封装成一个通用函数库，这样在以后每次开发的时候，引入我们自己封装的库，会大大提升我们开发的效率。 这里会为大家推荐一种比较高级的封装方法，也就是通过javascript的原型对象prototype创建openlayers扩展库，扩展库创建完成后，我们可以直接通过对象去访问我们封装的方法，很实用，也很方便，很多openlayers的扩展库都是通过这种方法进行封装的。 首先我们去openlayers官方下载最新的openlayers开发包： openlayers ，然后，创建一个demo.html，引入开发包，并创建一个地图，加入osm地图。 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <link rel="stylesheet" href="ol.css"> <style> body { margin: 0; } .map { position:

GeoJson usage in folium

由 拟墨画扇 提交于 2020-01-17 08:37:08
问题 I have used GeoJson method in FeatureGroup of folium to add polygon layers to my map. I am getting some error. I have checked the syntax of this method.Everything is correct but still i am getting the error mentioned below in the image. 回答1: I stumbled upon the same issue. From the documentation at https://python-visualization.github.io/folium/modules.html#folium.features.GeoJson you can see various examples of opening the geojson file. >>> # Providing file that shall be embedded. >>> GeoJson

Large geojson to topojson

由 百般思念 提交于 2020-01-17 06:41:52
问题 I am trying to convert a relatively large geojson file (383 MB) to topojson to use it with D3.js. I am running the following command on a mac book pro 2016: geo2topo test.json > test.topojson and also the following command for simplification: geo2topo test.json > test.topojson -q 10000 Both of them produce the same following error: buffer.js:503 throw new Error('"toString()" failed'); ^ Error: "toString()" failed at Buffer.toString (buffer.js:503:11) at JSON.parse () at ReadStream. (/usr

How to convert FeatureCollection to GeometryCollection or MultiPolygon?

由 老子叫甜甜 提交于 2020-01-16 08:38:10
问题 I have many polygons that need to be drawn manually and then get geo-coordinates. I need to get the coordinates of the drawn polygons in GeoJSON format. In this format: "{"type":"MultiPolygon","coordinates":[[[[37.4653933,55.3959159]...}" "{"type":"Polygon","coordinates":[[[37.475738525390625,55.41420507450017]...}" Or in this: "{"type":"GeometryCollection","geometries":[{"type":"Polygon","coordinates":[[[-98.0419921875,39.027718840211605]...}]}" I draw polygons at http://geojson.io/. But

openlayer加载矢量切片

由 随声附和 提交于 2020-01-16 00:27:33
数据是GIS的灵魂，没有数据也就谈不上GIS了，数据分为矢量数据和栅格数据，栅格数据也有一些短处，缺乏灵活性、实时性，数据完整性受损是比较突出的问题，矢量数据不同于栅格数据，比较灵活，数据完整，将两者结合诞生出—>矢量切片，不要被矢量这个词迷惑，矢量切片是不可被编辑的， 不可编辑不代表不能获取其属性信息 。 矢量数据的优点: 矢量切片可以以三种形式呈现：GeoJSON、TopoJSON 和 MapBox Vector Tile(.mvt)，矢量切片技术继承了矢量数据和切片地图的双重优势，有如下优点： 1、 对于栅格切片，更灵活，更细粒度的数据划分，要素级别； 2、 数据信息接近无损，但体积更小，请求指定地物的信息，直接在客户端获取，无需再次请求服务器； 3、样式可改变和定制（重点），矢量切片可以在客户端或者服务器端渲染，可以按照用户赋予的样式渲染； 4、对于原始矢量数据，更小巧，采用了重新编码，并进行了切分，只返回请求区域和相应级别的数据； 5、数据更新快，或者说是实时的，当数据库中的空间数据变化后，再次请求的数据是改变后的，在客户端渲染后既是最新的情况； 6、 更灵活，可以只是返回每个专题数据的图层，而不是像栅格切片把很多专题数据渲染在一个底图中。 详细介绍参考 https://blog.csdn.net/qingyafan/article/details/53367204

adjusting the drawn object in map automatically using leaflet 'Geojson' property 'getbound'

由 天大地大妈咪最大 提交于 2020-01-15 12:18:30
问题 I am using leaflet in my project for displaying objects and elements in map (Open source map). I have drawn some objects in my map using Geojson styles While using Geojson with the leaflet js implementation I am not able to use getBounds option properties. But normally if I am not using Geojson and its features I am able to use this option getBounds mentioned below. var group = new L.featureGroup([marker, circle, polygon, rectangle]); //alert(group); map.fitBounds(group.getBounds()); My set

Show large geojson file in android google maps

由 南笙酒味 提交于 2020-01-14 09:11:12
问题 I am trying to show a geojson layer to Google Map. The code is as follows. The geojson file is stored locally in my raw folder. The file has 286 features (around 15MB). Hence, reading this file and displaying it is consuming more time. Initially, I was getting out of memory error, which is removed by setting large heap as true in the manifest file. How can I load this file quickly (currently, its taking a minute or more)? I am wondering if there is some other efficient method to do this.

Show large geojson file in android google maps

由 岁酱吖の 提交于 2020-01-14 09:11:07
问题 I am trying to show a geojson layer to Google Map. The code is as follows. The geojson file is stored locally in my raw folder. The file has 286 features (around 15MB). Hence, reading this file and displaying it is consuming more time. Initially, I was getting out of memory error, which is removed by setting large heap as true in the manifest file. How can I load this file quickly (currently, its taking a minute or more)? I am wondering if there is some other efficient method to do this.
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