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Display nautical charts per the ENC specification.
Use case
The ENC specification describes how hydrographic data should be displayed digitally.
An ENC exchange set is a catalog of data files which can be loaded as cells. The cells contain information on how symbols should be displayed in relation to one another, so as to represent information such as depth and obstacles accurately.
How to use the sample
Run the sample and view the ENC data. Pan and zoom around the map. Take note of the high level of detail in the data and the smooth rendering of the layer.
How it works
Specify the path to a local CATALOG.031 file to create an EncExchangeSet
.
After loading the exchange set, get the EncDataset
objects in the exchange set.
Create an EncCell
for each dataset. Then create an EncLayer
for each cell.
Add the ENC layer to a map's operational layers collection to display it.
Relevant API
EncCell
EncDataset
EncExchangeSet
EncLayer
Offline data
To set up the sample's offline data, see the Use offline data in the samples section of the Qt Samples repository overview.
Link
Local Location
Exchange Set
<userhome>
/ArcGIS/Runtime/Data/ENC/ExchangeSetwithoutUpdates
Hydrography
<userhome>
/ArcGIS/Runtime/Data/ENC/hydrography
data, ENC, hydrographic, layers, maritime, nautical chart
Sample CodeAddEncExchangeSet.qml
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// [WriteFile Name=AddEncExchangeSet, Category=Layers]
// [Legal]
// Copyright 2019 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
import Esri.ArcGISRuntime
import Esri.ArcGISExtras
Rectangle {
id: rootRectangle
clip : true
width : 800
height : 600
readonly property url dataPath : {
Qt.platform.os === "ios" ?
System.writableLocationUrl(System.StandardPathsDocumentsLocation) + "/ArcGIS/Runtime/Data/" :
System.writableLocationUrl(System.StandardPathsHomeLocation) + "/ArcGIS/Runtime/Data/"
}
property var loadedEncLayerCount : 0
Component.onCompleted : {
// set resource path
EncEnvironmentSettings.resourcePath = dataPath + "ENC/hydrography" ;
// load the EncExchangeSet
encExchangeSet.load();
}
MapView {
id: mapView
anchors.fill : parent
Component.onCompleted : {
// Set the focus on MapView to initially enable keyboard navigation
forceActiveFocus();
}
Map {
id: map
Basemap {
initStyle : Enums.BasemapStyleArcGISOceans
}
EncExchangeSet {
id: encExchangeSet
paths : [dataPath + "ENC/ExchangeSetwithoutUpdates/ENC_ROOT/CATALOG.031" ]
property var layers : []
// connect to the load status changed signal
onLoadStatusChanged : {
if (loadStatus === Enums.LoadStatusFailedToLoad) {
console .log( "fail to load" , error.message, error.additionalMessage);
return ;
}
if (loadStatus !== Enums.LoadStatusLoaded) {
return ;
}
// loop through the datasets
for ( let i = 0 ; i < datasets.length; i++) {
// create an EncCell from each dataset
const encCell = ArcGISRuntimeEnvironment.createObject( "EncCell" , {
dataset : datasets[i]
}, map);
// create an EncLayer from each cell
const encLayer = ArcGISRuntimeEnvironment.createObject( "EncLayer" , {
cell : encCell
}, map);
layers.push(encLayer);
// connect to loadStatusChanged for each layer
encLayer.loadStatusChanged.connect(()=> {
if (encLayer.loadStatus === Enums.LoadStatusLoaded) {
loadedEncLayerCount++;
}
// loop through the layers and zoom to the combined full extent
if (loadedEncLayerCount === datasets.length) {
const fullExtents = [];
map.operationalLayers.forEach(layer => fullExtents.push(layer.fullExtent));
const fullExtentOfLayers = GeometryEngine.combineExtentsOfGeometries(fullExtents);
mapView.setViewpointGeometry(fullExtentOfLayers)
}
});
// add the layer to the map
map.operationalLayers.append(encLayer);
}
}
}
}
}
}