geojson

leaflet聚合图功能(附源码下载)

由 北慕城南 提交于 2020-04-20 01:39:43
前言 leaflet 入门开发系列环境知识点了解： leaflet api文档介绍 ，详细介绍 leaflet 每个类的函数以及属性等等 leaflet 在线例子 leaflet 插件 ，leaflet 的插件库，非常有用 内容概览 leaflet聚合图功能 源代码demo下载 效果图如下： 本篇主要参考leaflet官网聚合效果插件Leaflet.markercluster: https://github.com/Leaflet/Leaflet.markercluster 这个聚合插件具体使用看github地址，那里有详细说明以及例子。 模拟数据geojson格式如下： var geojson = {"type":"FeatureCollection", "features" : [ { "type":"Feature","geometry":{"type":"Point","coordinates":[113.16305738210656,23.13667404697526]},"properties":{"Name_CHN":"赤岗塔","StationNum":1,"Status":1 }}, { "type":"Feature","geometry":{"type":"Point","coordinates":[113.18383377370634,23

Leaflet Map code copied from View-source: not working

由 天涯浪子 提交于 2020-04-18 06:00:27
问题 I was trying to use a ready Leaflet Map example, based here: http://www.gistechsolutions.com/leaflet/DEMO/Select/SelectPoints3.html It hovers all points within 150 miles from the mouse click on the map. As you can see the link on the website works perfectly. unlike to my local file. I copied a whole code from this example into my local file and save it as a .html code. All javascript files has been deliberately copied (however, they appear as a links, so it wasn't necessary to copy them onto

Pop up on react leaflet map library

由 生来就可爱ヽ(ⅴ＜●) 提交于 2020-04-18 03:47:29
问题 I'm using react-leaftlet map library https://react-leaflet.js.org/en/ in my react app and i have rendered some markers on the map and when a user clicks on a marker, a pop up appears. I want to open a similar popup when a user clicks on the district of my map as well. How can i do that? The following is my code to render the markers with popup. (The map is rendered using geojson data) markerHospitalRender() { return this.props.hospitalData.map(item => { const position = [item.district_lat,

（数据科学学习手札64）在jupyter notebook中利用kepler.gl进行空间数据可视化

由 若如初见. 提交于 2020-04-18 00:28:31
一、简介 　　kepler.gl是由Uber开发的进行空间数据可视化的开源工具，是Uber内部进行空间数据可视化的默认工具，通过其面向Python开放的接口包keplergl，我们可以在jupyter notebook中通过书写Python代码的方式传入多种格式的数据，在其嵌入notebook的交互窗口中使用其内建的多种丰富的空间数据可视化功能，本文就将针对在jupyter notebook中使用keplergl的基本用法进行介绍。 二、利用keplergl调用kepler.gl 2.1 从一个小例子开始 　　首先我们需要在Python中安装kepler.gl的Python接口包keplergl，只需要简单的 pip install keplergl 即可，如果安装过程中遇到与geopandas、fiona相关的错误，只需要重装gdal模块即可，在完成安装之后，通过下面的小例子来认识kepler.gl的使用方式： from keplergl import KeplerGl # 创建一个KeplerGl对象 map1 = KeplerGl(height=500 ) # 激活KeplerGl对象到jupyter的窗口中 map1 　　在jupyter notebook中运行完上述代码后会出现kepler.gl的操作窗口，如下图所示： 　　点击左上角的小箭头便可以展开一个功能丰富的窗体：

Python：GeoJson格式的多边形裁剪Tiff影像并计算栅格数值

由 穿精又带淫゛_ 提交于 2020-04-18 00:28:11
JSON是通过键值对表示数据对象的一种格式，其全称为JavaScript Object Notation，它采用完全独立于编程语言的文本格式来存储和表示数据，轻量级、简洁清晰的层次结构、容易解析等特点使得JSON 成为理想的数据交换语言。它易于人阅读和编写，同时也易于机器解析和生成，并有效地提升网络传输效率，正不断成为一种越来越受欢迎的数据格式。GeoJson一种基于Json并对各种地理数据结构进行编码的格式，它将所有的地理要素分为Point、MultiPoint、LineString、MultiLineString、LinearRing、Polygon和MultiPolygon，每个完整的GeoJson数据结构总是一个完整的地理对象，比如一个GeoJson对象示例如下图所示： 在最近的项目中，需要用到GeoJson格式的面状数据来裁剪Tiff影像，刚开始的时候曾尝试使用Java来直接写，但是用了JAI库和GDAL库，都没有找到带有空间参考的多边形来裁剪Tiff影像的接口，无奈只能用Python来完成这一功能，不得不感叹Python语言的简洁美，使用Rasterio这个库可以完美实现这一功能，并且代码量非常之少。 本程序使用Python3.7版本，需要用到GDAL库和Rasterio库，可以在此链接中下载对应版本并安装： https://www.lfd.uci.edu/

Cosmos db unexpected validation failures from GeoJSON obtained from UK Environment Agency

由 我们两清 提交于 2020-04-17 21:15:53
问题 UPDATE 2020-03-04 Using MySql Server 8.0.19 I am able to successfully validate this GeoJSON using SELECT ST_IsValid(ST_GeomFromGeoJSON(geojson)) FROM test; The data type for geojson column is json . ORIGINAL QUESTION I'm new to the geospatial game, and it appears very much non-trivial! The headlines suggest Cosmos db supports GeoJSON out of the box with the exception that ST_WITHIN() doesn't support holes. Not a problem. So I loaded up all the of the available "polygons" from https:/

Cosmos db unexpected validation failures from GeoJSON obtained from UK Environment Agency

由 别等时光非礼了梦想. 提交于 2020-04-17 21:14:49
问题 UPDATE 2020-03-04 Using MySql Server 8.0.19 I am able to successfully validate this GeoJSON using SELECT ST_IsValid(ST_GeomFromGeoJSON(geojson)) FROM test; The data type for geojson column is json . ORIGINAL QUESTION I'm new to the geospatial game, and it appears very much non-trivial! The headlines suggest Cosmos db supports GeoJSON out of the box with the exception that ST_WITHIN() doesn't support holes. Not a problem. So I loaded up all the of the available "polygons" from https:/

Cosmos db unexpected validation failures from GeoJSON obtained from UK Environment Agency

由 混江龙づ霸主 提交于 2020-04-17 21:14:27
问题 UPDATE 2020-03-04 Using MySql Server 8.0.19 I am able to successfully validate this GeoJSON using SELECT ST_IsValid(ST_GeomFromGeoJSON(geojson)) FROM test; The data type for geojson column is json . ORIGINAL QUESTION I'm new to the geospatial game, and it appears very much non-trivial! The headlines suggest Cosmos db supports GeoJSON out of the box with the exception that ST_WITHIN() doesn't support holes. Not a problem. So I loaded up all the of the available "polygons" from https:/

Cosmos db unexpected validation failures from GeoJSON obtained from UK Environment Agency

由 做~自己de王妃 提交于 2020-04-17 21:14:16
问题 UPDATE 2020-03-04 Using MySql Server 8.0.19 I am able to successfully validate this GeoJSON using SELECT ST_IsValid(ST_GeomFromGeoJSON(geojson)) FROM test; The data type for geojson column is json . ORIGINAL QUESTION I'm new to the geospatial game, and it appears very much non-trivial! The headlines suggest Cosmos db supports GeoJSON out of the box with the exception that ST_WITHIN() doesn't support holes. Not a problem. So I loaded up all the of the available "polygons" from https:/

将阿里云上GeoJSON的市级数据用Python保存到本地磁盘

由 岁酱吖の 提交于 2020-04-17 20:18:40
阿里云GeoJSON地址： 地图选择器 ​ datav.aliyun.com 我看到了有人尝试将上面站点中的数据保存下来： 「GIS教程」利用Python获取全国GeoJSON数据并预览转换成shp格式文件 | 麻辣GIS ​ malagis.com 但他的脚本只是展示了部分地区的。 看了一下，这个大概是到了县区一级的边界，所以只要抓到市级别的单位就可以了。 解析出来的编码对应市区 下载好的GeoJSON数据 加载的效果 所用脚本： AliGeoJsonDownload.py 60.5K · 百度网盘 来源： oschina 链接： https://my.oschina.net/u/4386603/blog/3269603
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