geojson - 如何在 arcgis 4.x 中显示抖动强度？
问题描述
我从这个链接开始：
我想按照以下链接显示震动强度：
我试图实现它。请看一看：
<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"
/>
<!--
ArcGIS API for JavaScript, https://js.arcgis.com
For more information about the layers-geojson sample, read the original sample description at developers.arcgis.com.
https://developers.arcgis.com/javascript/latest/sample-code/layers-geojson/index.html
-->
<title>GeoJSONLayer - 4.15</title>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<link
rel="stylesheet"
href="https://js.arcgis.com/4.15/esri/themes/light/main.css"
/>
<script src="https://js.arcgis.com/4.15/"></script>
<script>
require([
"esri/Map",
"esri/layers/GeoJSONLayer",
"esri/views/MapView",
"esri/widgets/Legend"
], function(Map, GeoJSONLayer, MapView, Legend) {
// If GeoJSON files are not on the same domain as your website, a CORS enabled server
// or a proxy is required.
const url =
//"https://earthquake.usgs.gov/fdsnws/event/1/query?format=geojson&starttime&minlatitude=33.387&minlongitude=-127.134&maxlatitude=40.457&maxlongitude=-115.994&minlatitude=33.387&minlongitude=-127.134&maxlatitude=40.457&maxlongitude=-115.994&producttype=shakemap";
"https://services9.arcgis.com/RHVPKKiFTONKtxq3/arcgis/rest/services/USGS_Seismic_Data_v1/FeatureServer/1/query?where=1=1&geometry=-122.40,37.76&geometryType=esriGeometryPoint&inSR=4326&distance=100&units=esriSRUnit_StatuteMile&outFields=*&returnGeometry=true&geometryPrecision=4&outFields=*&f=pgeojson";
// Paste the url into a browser's address bar to download and view the attributes
// in the GeoJSON file. These attributes include:
// * mag - magnitude
// * type - earthquake or other event such as nuclear test
// * place - location of the event
// * time - the time of the event
// Use the Arcade Date() function to format time field into a human-readable format
const template = {
title: "Earthquake Info",
content: "Magnitude {mag} {type} hit {place} on {time}",
fieldInfos: [
{
fieldName: "time",
format: {
dateFormat: "short-date-short-time"
}
}
]
};
const renderer = {
type: "simple",
field: "mag",
symbol: {
type: "simple-marker",
color: "orange",
outline: {
color: "white"
}
},
visualVariables: [
{
type: "size",
field: "mag",
stops: [
{
value: 2.5,
size: "4px"
},
{
value: 8,
size: "40px"
}
]
}
]
};
const geojsonLayer = new GeoJSONLayer({
url: url,
title: "MMI",
copyright: "USGS Earthquakes",
popupTemplate: template,
renderer: renderer //optional
});
const map = new Map({
basemap: "gray",
layers: [geojsonLayer]
});
const view = new MapView({
container: "viewDiv",
center: [-122, 37],
zoom: 6,
map: map
});
view.ui.add(
new Legend({
view: view
}),
"bottom-left"
);
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>该网址返回一个多面体特征：
该地图显示没有多边形的点。请你帮助我好吗？
解决方案
查询实际上是返回多边形，您遇到的问题是错误的渲染器。这就是您将其视为点的原因。
在这里，您的示例正在运行，我使用您可能想要自定义的服务中定义的渲染器，
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<title>GeoJSONLayer - 4.15</title>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<link rel="stylesheet" href="https://js.arcgis.com/4.15/esri/themes/light/main.css" />
<script src="https://js.arcgis.com/4.15/"></script>
<script>
require([
"esri/Map",
"esri/layers/GeoJSONLayer",
"esri/views/MapView",
"esri/widgets/Legend",
"esri/renderers/support/jsonUtils"
], function (Map, GeoJSONLayer, MapView, Legend, rendererJsonUtils) {
const url =
"https://services9.arcgis.com/RHVPKKiFTONKtxq3/arcgis/rest/services/USGS_Seismic_Data_v1/FeatureServer/1/query?where=1=1&geometry=-122.40,37.76&geometryType=esriGeometryPoint&inSR=4326&distance=100&units=esriSRUnit_StatuteMile&outFields=*&returnGeometry=true&geometryPrecision=4&outFields=*&f=pgeojson";
const template = {
title: "Shake Intensity",
content: [
{
type: "fields",
fieldInfos: [
{
fieldName: "grid_value",
label: "Grid Value"
},
{
fieldName: "mag",
label: "Magnitude"
},
{
fieldName: "eventTime",
label: "Event Time",
format: {
dateFormat: "short-date-short-time"
}
},
{
fieldName: "updated",
label: "Updated",
format: {
dateFormat: "short-date-short-time"
}
},
{
fieldName: "url",
label: "Url"
}
]
}
]
};
const rendererJSON = {
"field": "grid_value",
"classificationMethod": "esriClassifyManual",
"classBreakInfos": [
{
"classMaxValue": 1.9999,
"symbol": {
"color": [
0,
0,
0,
0
],
"style": "esriSFSSolid",
"type": "esriSFS",
"outline": {
"color": [
0,
0,
0,
0
],
"width": 0.4,
"style": "esriSLSSolid",
"type": "esriSLS"
}
},
"description": "",
"label": "I (Not Felt)"
},
{
"classMaxValue": 3.9999,
"symbol": {
"color": [
0,
0,
0,
0
],
"style": "esriSFSSolid",
"type": "esriSFS",
"outline": {
"color": [
0,
0,
0,
0
],
"width": 0.4,
"style": "esriSLSSolid",
"type": "esriSLS"
}
},
"description": "",
"label": "II - III (Weak)"
},
{
"classMaxValue": 4.9999,
"symbol": {
"color": [
140,
250,
230,
255
],
"style": "esriSFSSolid",
"type": "esriSFS",
"outline": {
"color": [
0,
0,
0,
0
],
"width": 0.4,
"style": "esriSLSSolid",
"type": "esriSLS"
}
},
"description": "",
"label": "IV (Light)"
},
{
"classMaxValue": 5.9999,
"symbol": {
"color": [
140,
250,
140,
255
],
"style": "esriSFSSolid",
"type": "esriSFS",
"outline": {
"color": [
0,
0,
0,
0
],
"width": 0.4,
"style": "esriSLSSolid",
"type": "esriSLS"
}
},
"description": "",
"label": "V (Moderate)"
},
{
"classMaxValue": 6.9999,
"symbol": {
"color": [
255,
220,
20,
255
],
"style": "esriSFSSolid",
"type": "esriSFS",
"outline": {
"color": [
0,
0,
0,
0
],
"width": 0.4,
"style": "esriSLSSolid",
"type": "esriSLS"
}
},
"description": "",
"label": "VI (Strong)"
},
{
"classMaxValue": 7.9999,
"symbol": {
"color": [
255,
180,
0,
255
],
"style": "esriSFSSolid",
"type": "esriSFS",
"outline": {
"color": [
0,
0,
0,
0
],
"width": 0.4,
"style": "esriSLSSolid",
"type": "esriSLS"
}
},
"description": "",
"label": "VII (Very Strong)"
},
{
"classMaxValue": 8.9999,
"symbol": {
"color": [
255,
120,
20,
255
],
"style": "esriSFSSolid",
"type": "esriSFS",
"outline": {
"color": [
0,
0,
0,
0
],
"width": 0.4,
"style": "esriSLSSolid",
"type": "esriSLS"
}
},
"description": "",
"label": "VIII (Severe) "
},
{
"classMaxValue": 9.9999,
"symbol": {
"color": [
255,
0,
0,
255
],
"style": "esriSFSSolid",
"type": "esriSFS",
"outline": {
"color": [
0,
0,
0,
0
],
"width": 0.4,
"style": "esriSLSSolid",
"type": "esriSLS"
}
},
"description": "",
"label": "IX (Violent)"
},
{
"classMaxValue": 12,
"symbol": {
"color": [
143,
0,
0,
255
],
"style": "esriSFSSolid",
"type": "esriSFS",
"outline": {
"color": [
0,
0,
0,
0
],
"width": 0.4,
"style": "esriSLSSolid",
"type": "esriSLS"
}
},
"description": "",
"label": "X+ (Extreme)"
}
],
"type": "classBreaks",
"minValue": 0
};
const renderer = rendererJsonUtils.fromJSON(rendererJSON);
const geojsonLayer = new GeoJSONLayer({
url: url,
title: "MMI",
copyright: "USGS Earthquakes",
popupTemplate: template,
renderer
});
const map = new Map({
basemap: "gray",
layers: [geojsonLayer]
});
const view = new MapView({
container: "viewDiv",
center: [-122, 37],
zoom: 6,
map: map
});
view.ui.add(
new Legend({
view: view
}),
"bottom-left"
);
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>最后一件事，我不太清楚您为什么要查询和使用GeoJSONLayer，请记住，您可以使用FeatureLayer它实际上支持许多查询操作，并且您不需要获取它为您执行的 json 数据。
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