geojson

在最近的项目中，完成了许多python处理矢量数据的算法程序，比如缓冲区分析、叠置分析、统计分析等，主要用到的是GDAL/OGR库，很多功能都参照了此链接中的示例： http://pcjericks.github.io/py-gdalogr-cookbook/# 由于完成的功能在上面链接中都能找到实现的代码，所以原来不打算写博客的，但是今天写的这个SHP转GeoJSON的算法把我坑得不轻，着实郁闷了好久才解决，因此就写一下权当纪念吧。有时候写程序真的是一件充满玄学的事情，原理上怎么看怎么对，但是运行起来却偏偏不是那回事，就算调试也给你不报错直接闪退，特别是处理空间数据时属性的编码问题，更是搞得人头皮发麻。这种情况下，能不能调的出来全靠运气，搞不好一个小问题卡一个星期都是正常，这可能也是程序员普遍发量稀少的原因吧。更加玄学的是，解决问题的方式又常常充满戏剧性，折腾了一个早上加半个下午没找到原因，起来喝杯水却突然灵感乍现，三四行代码调整一下顺序，一顿骚操作，点击运行，突然就能运行成功了，再看一下结果，卧槽! 还真是对的！山穷水尽疑无路，柳暗花明又一村，这种感觉真是刺激。 好了，将Shapefile转化为GeoJSON的完整代码如下： 1 # -*- coding: utf-8 -*- 2 from osgeo import ogr 3 import gdal 4 import sys

I have a leaflet map showing points for public art pieces, rendered from GeoJSON . Next to the map, I created a list of the pieces from the same GeoJSON data and want to be able to click on an item from the list outside of the map and have the related marker's popup come up on the map. How can I link the list of items to their respective markers through a click event? My map.js file looks like this: var map; var pointsLayer; $(document).ready(function () { map = new L.Map('mapContainer'); var url = 'http://{s}.tiles.mapbox.com/v3/mapbox.mapbox-streets/{z}/{x}/{y}.png'; var copyright = 'Map

I have an issue with @turf/turf the last version, in my react native app "react-native": "0.58.0", "@turf/turf": "^5.1.6" I just followed the same example in the README.md but it's not working with me anymore. The issue is when I import turf like this import * as turf from '@turf/turf'; and write the function here is handleNearby = () => { const { region, providers } = this.state; let currentPoint = [region.longitude, region.latitude] let points = _.map(providers, p => { console.log('@p', p); const to = [p.coordinates.longitude, p.coordinates.latitude]; const distance = turf.distance

topoJSON and geoJSON files are know very common for drawing maps on the internet. Is it possible to import them in R to draw choropleth maps? Spacedman Get the rgdal package installed. Then if: library(rgdal) > "GeoJSON" %in% ogrDrivers()$name [1] TRUE then you can do something like: > map = readOGR("foo.json", "OGRGeoJSON") > plot(map) But you need GeoJSON support in your ogrDrivers list. 来源： https://stackoverflow.com/questions/24183007/is-it-possible-to-read-geojson-or-topojson-file-in-r-to-draw-a-choropleth-map

访问地址： http://localhost:8080/Apps/Sandcastle/index.html?src=GeoJSON%20and%20TopoJSON.html&label=Tutorials 知识点 // Seed the random number generator for repeatable results. Cesium.Math.setRandomNumberSeed(0); // 产生随机颜色值 color = Cesium.Color.fromRandom({alpha : 1.0}); // 一个DataSource处理 GeoJSON和TopoJSON数据的。 var promise = Cesium.GeoJsonDataSource.load('../../SampleData/ne_10m_us_states.topojson'); // 等到数据源加载成功后 promise.then(function(dataSource) { } // 矩形框的颜色 和 边框 //Set the polygon material to our random color. entity.polygon.material = color; //Remove the outlines. entity.polygon.outline = false;