Offline geocode

View inC++QMLView on GitHubSample viewer app

Geocode addresses to locations and reverse geocode locations to addresses offline.

screenshot

Use case

You can use an address locator file to geocode addresses and locations. For example, you could provide offline geocoding capabilities to field workers repairing critical infrastructure in a disaster when network availability is limited.

How to use the sample

Type the address in the Search menu option or select from the list to Geocode the address and view the result on the map. Tap the location you want to reverse geocode. Select the pin to highlight the PictureMarkerSymbol (i.e. single tap on the pin) and then tap-hold and drag on the map to get real-time geocoding.

How it works

  1. Use the path of a .loc file to create a LocatorTask object.
  2. Set up GeocodeParameters and call geocodeWithParameters to get geocode results.

Relevant API

  • GeocodeParameters
  • GeocodeResult
  • LocatorTask
  • ReverseGeocodeParameters

Offline Data

Read more about how to set up the sample's offline data here.

Link Local Location
SanDiego tpkx file <userhome>/ArcGIS/Runtime/Data/tpkx/streetmap_SD.tpkx
SanDiego loc Files <userhome>/ArcGIS/Runtime/Data/Locators/SanDiegoStreetAddressLocator/SanDiego_StreetAddress.loc

Tags

geocode, geocoder, locator, offline, package, query, search

Sample Code

OfflineGeocode.qml
Use dark colors for code blocksCopy
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
// [WriteFile Name=OfflineGeocode, Category=Search]
// [Legal]
// Copyright 2016 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.ArcGISExtras 1.1
import Esri.ArcGISRuntime 100.15
import Esri.ArcGISRuntime.Toolkit 100.15

Rectangle {
    clip: true
    width: 800
    height: 600

    readonly property url dataPath: System.userHomePath + "/ArcGIS/Runtime/Data"
    property Point pinLocation: null
    property Point clickedPoint: null
    property bool isReverseGeocode: false
    property bool isPressAndHold: false
    property string errorMessage: ""

    // Map view UI presentation at top
    MapView {
        id: mapView
        anchors.fill: parent

        Component.onCompleted: {
            // Set the focus on MapView to initially enable keyboard navigation
            forceActiveFocus();
        }

        // initialize callout
        calloutData {
            title: "Address"
        }

        Map {

            // create local tiled layer using tile package
            Basemap {
                ArcGISTiledLayer {
                    TileCache {
                        path: dataPath + "/tpkx/streetmap_SD.tpkx"
                    }
                }
            }

            // set initial viewpoint
            ViewpointCenter {
                Point {
                    x: -13042254.715252
                    y: 3857970.236806
                    spatialReference: SpatialReference {
                        wkid: 3857
                    }
                }
                targetScale: 2e4
            }

            onErrorChanged: errorMessage = error.message;
        }

        // add a graphics overlay to the mapview
        GraphicsOverlay {
            id: graphicsOverlay

            // pin graphic that will visually display geocoding results
            Graphic {
                id: pinGraphic
                geometry: pinLocation
                visible: true

                PictureMarkerSymbol {
                    id: pictureMarker
                    height: 36
                    width: 19
                    url: "qrc:/Samples/Search/OfflineGeocode/red_pin.png"
                    offsetY: height / 2
                }
            }
        }

        Callout {
            id: callout
            calloutData: parent.calloutData
            screenOffsetY: (pictureMarker.height / 2) * -1
            accessoryButtonHidden: true
            leaderPosition: leaderPositionEnum.Automatic
        }

        // dismiss suggestions and no results notification on mouse press
        onMousePressed: {
            noResultsRect.visible = false;
            suggestionRect.visible = false;
        }

        onMouseClicked: {
            clickedPoint = mouse.mapPoint;
            mapView.identifyGraphicsOverlayWithMaxResults(graphicsOverlay, mouse.x, mouse.y, 5, false, 1);
        }

        onIdentifyGraphicsOverlayStatusChanged: {
            if (identifyGraphicsOverlayStatus === Enums.TaskStatusCompleted){

                // if clicked on the pin graphic, display callout.
                if (identifyGraphicsOverlayResult.graphics.length > 0)
                    callout.showCallout();

                // otherwise, normal reverse geocode
                else if (locatorTask.geocodeStatus !== Enums.TaskStatusInProgress){
                    isReverseGeocode = true;
                    locatorTask.reverseGeocodeWithParameters(clickedPoint, reverseGeocodeParams);
                }
            }
        }

        // hide suggestion window if viewpoint changes
        onViewpointChanged: {
            suggestionRect.visible = false;
            noResultsRect.visible = false;
        }

        // When user press and holds, prepare for real-time reverse geocoding
        onMousePressedAndHeld: {
            isPressAndHold = true;
            isReverseGeocode = true;

            if (locatorTask.geocodeStatus !== Enums.TaskStatusInProgress)
                locatorTask.reverseGeocodeWithParameters(mouse.mapPoint, reverseGeocodeParams);
        }

        // real-time reverse geocode if mouse being held down
        onMousePositionChanged: {
            if (isPressAndHold && locatorTask.geocodeStatus !== Enums.TaskStatusInProgress)
                locatorTask.reverseGeocodeWithParameters(mouse.mapPoint, reverseGeocodeParams);
        }

        // stop real-time reverse geocoding
        onMouseReleased: {
            isPressAndHold = false;
            isReverseGeocode = false;
        }

        onErrorChanged: errorMessage = error.message;
    }

    //! [OfflineGeocode LocatorTask]

    LocatorTask {
        id: locatorTask
        url: dataPath + "/Locators/SanDiegoStreetAddressLocator/SanDiego_StreetAddress.loc"
        //! [OfflineGeocode LocatorTask]

        suggestions {
            // suggestions will update whenever textField's text property changes
            searchText: textField.text
            suggestTimerThreshold: 250
            suggestParameters: SuggestParameters {
                maxResults: 5
            }
        }

        GeocodeParameters {
            id: geocodeParams
            minScore: 75
            maxResults: 1
        }

        ReverseGeocodeParameters {
            id: reverseGeocodeParams
            maxDistance: 1000
            maxResults: 1
        }

        onGeocodeStatusChanged: {
            if (geocodeStatus === Enums.TaskStatusCompleted) {

                if(geocodeResults.length > 0) {
                    callout.dismiss();

                    // zoom to geocoded location
                    mapView.setViewpointCenter(geocodeResults[0].displayLocation)

                    // set pin and edit callout
                    pinLocation = geocodeResults[0].displayLocation;
                    mapView.calloutData.geoElement = pinGraphic;
                    mapView.calloutData.detail = geocodeResults[0].label;

                    // if it was a reverse geocode, also display callout
                    if (isReverseGeocode)
                        callout.showCallout();

                    // continue reverse geocoding if press and holding mouse
                    if (!isPressAndHold)
                        isReverseGeocode = false;
                }

                // if no result found, inform user
                else {
                    callout.dismiss()
                    noResultsRect.visible = true;
                    pinLocation = null;
                }
            }
        }

        onErrorChanged: errorMessage = error.message;
    }

    Column {
        anchors {
            fill: parent
            margins: 10
        }

        Rectangle {
            id: addressSearchRect
            anchors {
                left: parent.left
                right: parent.right
            }
            height: childrenRect.height

            color: "#f7f8fa"
            border {
                color: "#7B7C7D"
                width: 1
            }
            radius: 2

            RowLayout {
                width: parent.width
                height: childrenRect.height

                // search bar for geocoding
                TextField {
                    id: textField
                    Layout.fillWidth: true
                    leftPadding: 5
                    selectByMouse: true

                    placeholderText: "Enter an Address"

                    // when user types, make suggestions visible
                    onTextChanged: {
                        suggestionRect.visible = true;
                    }

                    // when enter or return is presed, begin geocoding with inputted text
                    onAccepted: {
                        suggestionRect.visible = false;
                        if (locatorTask.geocodeStatus !== Enums.TaskStatusInProgress)
                            locatorTask.geocodeWithParameters(text, geocodeParams);
                    }

                    // initial text
                    Component.onCompleted: {
                        text = "910 N Harbor Dr, San Diego, CA 92101";
                        suggestionRect.visible = false;
                    }
                }

                // button to open and close suggestions
                Rectangle {
                    Layout.margins: 5
                    width: height
                    height: textField.contentHeight
                    color: "#f7f8fa"
                    radius: 2

                    Image {
                        anchors.fill: parent
                        source: suggestionRect.visible ? "qrc:/Samples/Search/OfflineGeocode/ic_menu_closeclear_light_d.png" : "qrc:/Samples/Search/OfflineGeocode/ic_menu_collapsedencircled_light_d.png"

                        MouseArea {
                            anchors.fill: parent
                            onClicked: {
                                suggestionRect.visible = !suggestionRect.visible;
                            }
                        }
                    }
                }
            }
        }

        Rectangle {
            id: suggestionRect
            width: addressSearchRect.width
            height: 20 * locatorTask.suggestions.count
            color: "#f7f8fa"
            opacity: 0.85

            ListView {
                id: suggestView
                model: locatorTask.suggestions
                height: parent.height
                delegate: Component {

                    Rectangle {
                        width: addressSearchRect.width
                        height: 20
                        color: "#f7f8fa"
                        border.color: "darkgray"

                        Text {
                            anchors {
                                verticalCenter: parent.verticalCenter
                                leftMargin: 5
                                rightMargin: 5
                            }

                            font {
                                weight: Font.Black
                                pixelSize: 12
                            }

                            width: parent.width
                            text: label
                            elide: Text.ElideRight
                            leftPadding: 5
                            color: "black"
                        }

                        // when user clicks suggestion, geocode with the selected address
                        MouseArea {
                            anchors.fill: parent
                            onClicked: {
                                if (locatorTask.geocodeStatus !== Enums.TaskStatusInProgress) {
                                    // geocode with the suggestion
                                    locatorTask.geocodeWithParameters(label, geocodeParams);

                                    // change the text label
                                    textField.text = label;
                                }

                                // dismiss suggestions
                                suggestionRect.visible = false;
                            }
                        }
                    }
                }
            }
        }
    }

    // running when geocoding in progress
    BusyIndicator {
        id: busyIndicator
        anchors.centerIn: parent
        running: locatorTask.geocodeStatus === Enums.TaskStatusInProgress
    }

    Rectangle {
        id: noResultsRect
        anchors.centerIn: parent
        height: 50
        width: 200
        color: "#f7f8fa"
        visible: false
        radius: 2
        opacity: 0.85
        border.color: "black"

        Text {
            anchors.centerIn: parent
            text: "No matching address"
            font.pixelSize: 18
        }
    }

    Dialog {
        modal: true
        x: Math.round(parent.width - width) / 2
        y: Math.round(parent.height - height) / 2
        standardButtons: Dialog.Ok
        visible: text.length > 0
        title: "Error"
        property alias text : textLabel.text
        property alias informativeText : detailsLabel.text
        ColumnLayout {
            Text {
                id: textLabel
                text: errorMessage
            }
            Text {
                id: detailsLabel
                text: "please consult README.md"
            }
        }
    }
}

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.