Create a notification every time a given location data source has entered and/or exited a set of features or graphics.
Use case
Geotriggers can be used to notify users when they have entered or exited a geofence by monitoring a given set of features or graphics. They could be used to display contextual information to museum visitors about nearby exhibits, notify hikers when they have wandered off their desired trail, notify dispatchers when service workers arrive at a scene, or more.
How to use the sample
Observe a virtual walking tour of the Santa Barbara Botanic Garden. Information about the user's current Garden Section, as well as information about nearby points of interest within 10 meters will display or be removed from the UI when the user enters or exits the buffer of each feature.
How it works
- Create a
GeotriggerFeedwith anAbstractLocationDataSourceclass (in this case, aSimulatedLocationDataSource). - Create a
FeatureFenceParametersclass with aServiceFeatureTableand a buffer distance at which to monitor each feature. - Create a
FenceGeotriggerwith the geotrigger feed, aFenceRuleType, the fence parameters, an Arcade Expression, and a name for the specific geotrigger. - Create a
GeotriggerMonitorwith the fence geotrigger and callGeotriggerMonitor.start()to begin listening for events that meet theFenceRuleType. - When
onGeotriggerNotificationemits, capture theGeotriggerNotificationInfoto retrieve information about the geotrigger and the feature. - Retrieve the feature information from the GeoElement passed by the geotrigger notification for later querying and display.
- Depending on the
FenceGeotriggerNotificationInfo::fenceNotificationType()display or hide information on the UI from theGeoElement's attributes.
Relevant API
- ArcadeExpression
- FeatureFenceParameters
- FenceGeotrigger
- FenceGeotriggerNotificationInfo
- FenceRuleType
- GeoElement
- Geotrigger
- GeotriggerFeed
- GeotriggerMonitor
- GeotriggerNotificationInfo
- ServiceFeatureTable
- SimulatedLocationDataSource
About the data
This sample uses the Santa Barbara Botanic Garden Geotriggers Sample ArcGIS Online Web Map which includes a georeferenced map of the garden as well as select polygon and point features to denote garden sections and points of interest. Description text and attachment images in the feature layers were provided by the Santa Barbara Botanic Garden and more information can be found on the Garden Sections & Displays portion of their website. All assets are used with permission from the Santa Barbara Botanic Garden. For more information, visit the Santa Barbara Botanic Garden website.
Tags
alert, arcade, fence, geofence, geotrigger, location, navigation, notification, notify, routing, trigger
Sample Code
// [WriteFile Name=Geotriggers, Category=Analysis]
// [Legal]
// Copyright 2021 Esri.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [Legal]
import QtQuick 2.6
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import Esri.ArcGISRuntime 100.15
Rectangle {
id: rootRectangle
clip: true
width: 800
height: 600
property var currentFeatureName: ""
property var currentSectionName: ""
property var poisInRange: []
property var descriptionMap: ({})
property var imageUrlMap: ({})
property var featuresMap: ({})
property ArcGISFeature feature: null
property Attachment imageAttachment: null
property AttachmentListModel attachmentListModel: null
MapView {
id: mapView
anchors.fill: parent
Component.onCompleted: {
// Set the focus on MapView to initially enable keyboard navigation
forceActiveFocus();
}
Map {
PortalItem {
itemId: "6ab0e91dc39e478cae4f408e1a36a308"
}
ServiceFeatureTable {
id: gardenSectionsServiceFeatureTable
PortalItem {
itemId: "1ba816341ea04243832136379b8951d9"
}
initLayerId: "0"
}
ServiceFeatureTable {
id: gardenPoisServiceFeatureTable
PortalItem {
itemId: "7c6280c290c34ae8aeb6b5c4ec841167"
}
initLayerId: "0"
}
}
SimulationParameters {
id: simulationParameters
velocity: 5
}
locationDisplay {
id: userLocation
autoPanMode: Enums.LocationDisplayAutoPanModeRecenter
initialZoomScale: 1000
dataSource: SimulatedLocationDataSource {
id: simulatedLocationdataSource
Component.onCompleted: {
setLocationsWithPolylineAndParameters(walkingTourPath, simulationParameters);
simulatedLocationdataSource.start();
}
}
}
}
GeotriggerMonitor {
id: sectionGeotriggerMonitor
geotrigger: FenceGeotrigger {
feed: LocationGeotriggerFeed {
locationDataSource: simulatedLocationdataSource
}
ruleType: Enums.FenceRuleTypeEnterOrExit
fenceParameters: FeatureFenceParameters {
featureTable: gardenSectionsServiceFeatureTable
bufferDistance: 0
}
messageExpression: ArcadeExpression {
expression: "$fencefeature.name";
}
name: "sectionGeotrigger"
}
onGeotriggerNotification: {
// the message property contains the evaluated messageExpression of the FenceGeotrigger
const sectionName = geotriggerNotificationInfo.message;
// Pass the triggering fence feature to a map for later querying and display
featuresMap[sectionName] = geotriggerNotificationInfo.fenceGeoElement
// If the user enters a new section, store its information in memory if not already there, and set the current section to the new section
if (geotriggerNotificationInfo.fenceNotificationType === Enums.FenceNotificationTypeEntered) {
if (!(sectionName in descriptionMap))
descriptionMap[sectionName] = geotriggerNotificationInfo.fenceGeoElement.attributes.attributeValue("description").toString();
currentSectionName = sectionName;
} else if (geotriggerNotificationInfo.fenceNotificationType === Enums.FenceNotificationTypeExited && currentSectionName === sectionName) {
// If the user exits the section they were currently in, remove section information from the UI
currentSectionName = "N/A";
}
}
Component.onCompleted: {
start();
}
}
GeotriggerMonitor {
id: poiGeotriggerMonitor
geotrigger: FenceGeotrigger {
feed: LocationGeotriggerFeed {
locationDataSource: simulatedLocationdataSource
}
ruleType: Enums.FenceRuleTypeEnterOrExit
fenceParameters: FeatureFenceParameters {
featureTable: gardenPoisServiceFeatureTable
bufferDistance: 10
}
messageExpression: ArcadeExpression {
expression: "$fencefeature.name";
}
name: "poiGeotrigger"
}
onGeotriggerNotification: {
const poiName = geotriggerNotificationInfo.message;
const index = poisInRange.indexOf(poiName);
// Commit feature attributes to memory for later querying and display
if (!(poiName in featuresMap))
featuresMap[poiName] = geotriggerNotificationInfo.fenceGeoElement;
if (!(poiName in descriptionMap))
descriptionMap[poiName] = geotriggerNotificationInfo.fenceGeoElement.attributes.attributeValue("description").toString();
// If entering a fence feature, add it to the UI
if (geotriggerNotificationInfo.fenceNotificationType === Enums.FenceNotificationTypeEntered && index === -1)
poisInRange[poisInRange.length] = poiName;
// If exiting the fence feature, remove it from the UI
else if (geotriggerNotificationInfo.fenceNotificationType === Enums.FenceNotificationTypeExited)
poisInRange.splice(index, 1);
poisInRangeChanged();
}
Component.onCompleted: {
start();
}
}
Polyline {
id: walkingTourPath
json: {
"paths":[[[-119.709881177746,34.4570041646846],[-119.709875813328,34.4570152227745],[-119.709869107805,34.4570240692453],[-119.709859720074,34.4570351273326],[-119.709853014551,34.4570539260775],[-119.709847650133,34.4570760422426],[-119.709848991238,34.4570926293626],[-119.70985569676,34.4571103222869],[-119.709873131119,34.4571202745552],[-119.709889224373,34.4571302268223],[-119.709902635418,34.4571357558591],[-119.709910682045,34.4571600836165],[-119.709910682045,34.4571744591062],[-119.709902635418,34.4571833055602],[-119.709889224373,34.4571910462067],[-119.70988251885,34.4571965752394],[-119.70988251885,34.4572032100782],[-119.709889224373,34.4572175855605],[-119.709898612104,34.4572264320099],[-119.709912023149,34.4572341726524],[-119.709901294313,34.4572419132941],[-119.709895929895,34.4572507597409],[-119.709897271,34.4572596061868],[-119.709902635418,34.4572728758539],[-119.709902635418,34.4572828281028],[-119.70990934094,34.457294991961],[-119.709912023149,34.4573038384022],[-119.709886542164,34.4573115790375],[-119.709861061178,34.4573248486963],[-119.709843626819,34.4573414357669],[-119.709836921297,34.4573668692686],[-119.709843626819,34.4573934085666],[-119.709827533565,34.4574055724087],[-119.709791323744,34.4574188420525],[-119.709749749504,34.4574332174977],[-119.709709516369,34.4574431697275],[-119.709734997354,34.4574807670294],[-119.709748062646,34.4575248306656],[-119.709757450378,34.4575635337324],[-119.709770861423,34.457600025179],[-119.709785613572,34.4576387282109],[-119.70980573014,34.4576730080242],[-119.709815117871,34.4577117110223],[-119.709821823394,34.4577504140025],[-119.709821823394,34.4577869053674],[-119.709821823394,34.4578256083127],[-119.70981780008,34.4578609938471],[-119.709819141185,34.457906331541],[-119.70981460448,34.4579890675855],[-119.709818627793,34.4580675790658],[-119.70982667442,34.4581118108532],[-119.709832038838,34.4581471962662],[-119.709834721047,34.4581947453913],[-119.709836062152,34.4582323423548],[-119.709834721047,34.4582787856393],[-119.709805216748,34.4583429215611],[-119.709759619195,34.4584026342716],[-119.709700610597,34.4584612411497],[-119.709645400048,34.4585103926263],[-119.709566274882,34.4585457778704],[-119.709493855239,34.4585944325566],[-119.709458986522,34.458622077252],[-119.709424117805,34.4586198656767],[-119.709386566878,34.4586110193749],[-119.70935438037,34.4586110193749],[-119.709339628221,34.4586231830396],[-119.709324876071,34.4586585682359],[-119.709306100608,34.4586862129101],[-119.709269890786,34.4587171749343],[-119.709244409801,34.4587238096523],[-119.709229657651,34.4587293385835],[-119.709212223293,34.4587459253751],[-119.70919076562,34.4587945799446],[-119.709174672366,34.4588503400161],[-119.709157238008,34.4589288506865],[-119.709153214694,34.4589951976744],[-119.709155896903,34.4590449578807],[-119.70916394353,34.4590958238387],[-119.709186742307,34.4591323146156],[-119.709218928815,34.4591621706939],[-119.709237704278,34.4591831805204],[-119.709241727592,34.4592252001575],[-119.709238133851,34.459258658624],[-119.709219358388,34.4592796684262],[-119.709207288447,34.4592962551085],[-119.709208629552,34.4593084186733],[-119.709271661463,34.4593791884701],[-119.709310553494,34.4594267368937],[-119.709330670062,34.4594510639836],[-119.709353468838,34.4595008239182],[-119.70936285657,34.4595362087426],[-119.709423221989,34.4595943612845],[-119.709455408497,34.4596297460692],[-119.709487595005,34.459665130839],[-119.709507711573,34.4596817174446],[-119.709523804827,34.4596861405389],[-119.709557332439,34.4596894578594],[-119.709586836739,34.4596894578594],[-119.709593542261,34.4596772943501],[-119.709590860052,34.4596496500041],[-119.709572084589,34.4595777746615],[-119.709566720171,34.4595313320996],[-119.709578790112,34.4595136396883],[-119.709590860052,34.4594992646013],[-119.709627069874,34.4594882068404],[-119.709675349636,34.4595567649343],[-119.709735699339,34.4596197941001],[-119.709775932474,34.4596795058974],[-119.709802754564,34.4597126790997],[-119.709832258863,34.4597359003334],[-119.70986712758,34.4597171021923],[-119.70986980979,34.4596839289918],[-119.709865786476,34.4596308518435],[-119.709876515312,34.4595788804365],[-119.70988187973,34.4595346494263],[-119.709879197521,34.4594926299449],[-119.709852375431,34.4594539277723],[-119.709806777878,34.4593953215911],[-119.709767885847,34.4593212344729],[-119.709720947189,34.4592195028005],[-119.709708720088,34.4591478732967],[-119.709710061193,34.4591058536206],[-119.709707378984,34.459079314867],[-119.709652393699,34.4590262373344],[-119.709617524982,34.4589499383221],[-119.709626771268,34.4588695962162],[-119.709683097658,34.4588032491285],[-119.709730036316,34.4587391135603],[-119.709759540615,34.4586993052518],[-119.7097850216,34.4586650258598],[-119.710059948024,34.4587744987075],[-119.710104204473,34.4587932970608],[-119.710128443889,34.4587649224307],[-119.71019415801,34.4587096331253],[-119.710273283176,34.4586731421637],[-119.71031619852,34.4586532379961],[-119.710367160491,34.4586023717685],[-119.710392641477,34.4585747270665],[-119.710432874612,34.4585083797445],[-119.710471766643,34.4584453497398],[-119.710505294256,34.4584165991955],[-119.710575487456,34.4583689119728],[-119.710705574593,34.4583136224052],[-119.710780676446,34.4582627559707],[-119.710839685044,34.4582030431601],[-119.710895995717,34.4581546042213],[-119.710948298793,34.458095997128],[-119.710988531928,34.4580263320391],[-119.711015354018,34.4579511379096],[-119.711011330705,34.4579102234284],[-119.710985849719,34.4578847900921],[-119.710946957688,34.4578715205223],[-119.710779319625,34.4578847900921],[-119.71073908649,34.4578847900921],[-119.7107122644,34.4578604625458],[-119.71069751225,34.4578295002039],[-119.710674713473,34.4578095958352],[-119.710642526965,34.4577996436491],[-119.710614363771,34.457830606002],[-119.71057547174,34.4578571451526],[-119.710539261918,34.4578737321174],[-119.71049500547,34.4578858958895],[-119.710452090125,34.4578836842947],[-119.710413198095,34.4578748379149],[-119.710375647168,34.4578527219614],[-119.710336755138,34.4578350291944],[-119.710299204211,34.4578107016336],[-119.71027506433,34.4577885856631],[-119.710269605616,34.4577886418169],[-119.710240101317,34.4577510446536],[-119.710198527077,34.4576758502763],[-119.710154270628,34.4575984442288],[-119.710112696389,34.4575265671206],[-119.710044300059,34.4574381029023],[-119.709978842634,34.4573543166616],[-119.709966772693,34.4573410470074],[-119.709972137111,34.4573200367174],[-119.70997481932,34.4573023438375],[-119.709973478216,34.4572846509538],[-119.709970796007,34.457259217427],[-119.709931903976,34.4572348896984],[-119.709914469617,34.4572337838924],[-119.709893011945,34.4572171968005],[-119.709884965318,34.4571972922858],[-119.709902232039,34.4571821133624],[-119.70991161977,34.457167737874],[-119.709907596457,34.4571389868898],[-119.709919666397,34.4571235055865],[-119.709922348606,34.4571047068572],[-119.709918325293,34.4570836965077],[-119.709919666397,34.4570648977695],[-119.70992637192,34.4570516280694],[-119.709933077442,34.4570339351326],[-119.709935759651,34.4570151363832],[-119.709927713024,34.4570062899114],[-119.70991161977,34.4570018666751],[-119.709883456576,34.4570040782933]]],
"spatialReference":{
"wkid":4326,
"latestWkid":4326
}
}
}
// Functions
function getFeatureInformation(featureName) {
featureInfoPane.featureName = featureName;
featureInfoPane.description = descriptionMap[featureName];
// If image has already been fetched, retrieve it from memory
if (featureName in imageUrlMap) {
featureInfoPane.imageSourceUrl = imageUrlMap[featureName];
return
}
featureInfoPane.imageSourceUrl = "";
// Otherwise fetch the attachment from the feature's AttachmentListModel
feature = featuresMap[featureName];
attachmentListModel = feature.attachments;
attachmentListModel.onFetchAttachmentsStatusChanged.connect(getImageAttachmentUrl);
}
function getImageAttachmentUrl() {
if (attachmentListModel.fetchAttachmentsStatus === Enums.TaskStatusCompleted) {
imageAttachment = attachmentListModel.get(0);
imageAttachment.onFetchDataStatusChanged.connect(() => {
if (imageAttachment.fetchDataStatus === Enums.TaskStatusCompleted)
featureInfoPane.imageSourceUrl = imageUrlMap[currentFeatureName] = imageAttachment.attachmentUrl;
});
imageAttachment.fetchData();
}
}
// User interface
// The featureSelectButtonsColumn displays the current section as well as points of interest within 10 meters
// Buttons are added and removed when a feature fence has been entered or exited.
Control {
id: featureSelectButtonsColumn
anchors.right: parent.right
padding: 10
visible: !featureInfoPane.visible
background: Rectangle {
color: "white"
border.color: "black"
}
contentItem: Column {
id: column
width: 200
spacing: 10
Text {
anchors.horizontalCenter: parent.horizontalCenter
horizontalAlignment: Text.AlignHCenter
padding: 5
text: "Current Garden Section"
color: "#3B4E1E"
font {
bold: true
pointSize: 20
}
}
RoundButton {
id: sectionButton
width: parent.width - 10
padding: 20
Text {
id: buttonText
anchors.centerIn: parent
horizontalAlignment: Text.AlignHCenter
verticalAlignment: Text.AlignVCenter
text: currentSectionName
font {
bold: true
pointSize: 18
}
wrapMode: Text.WordWrap
width: parent.width - 5
color: "white"
}
background: Rectangle {
radius: sectionButton.radius
color: "#3B4E1E"
}
enabled: buttonText.text !== "N/A"
onClicked: {
currentFeatureName = buttonText.text;
getFeatureInformation(currentFeatureName);
featureInfoPane.visible = true;
}
}
Rectangle {
id: dividingLine
anchors.horizontalCenter: parent.horizontalCenter
width: parent.width - 20
height: 2
color: "black"
visible: poiHeader.visible
}
Text {
id: poiHeader
anchors.horizontalCenter: parent.horizontalCenter
horizontalAlignment: Text.AlignHCenter
padding: 5
text: "Points of Interest"
font {
bold: true
pointSize: 16
}
color: "#AC901E"
visible: poisInRange.length > 0
}
Repeater {
id: poiRepeater
model: poisInRange
delegate: RoundButton {
id: poiButton
width: parent.width - 10
padding: 20
Text {
id: poiButtonText
anchors.centerIn: parent
horizontalAlignment: Text.AlignHCenter
width: parent.width - 5
text: modelData
wrapMode: Text.WordWrap
font.bold: true
color: "white"
}
background: Rectangle {
anchors.fill: parent
radius: poiButton.radius
color: "#AC901E"
}
onClicked: {
currentFeatureName = poiButtonText.text;
getFeatureInformation(currentFeatureName);
featureInfoPane.visible = true;
}
}
}
}
}
// The FeatureInfoPane displays the name, description, and image retrieved from a fence feature.
FeatureInfoPane {
id: featureInfoPane
}
}