Choosing the correct spatial reference is important for ensuring accurate projection of data points to a map.
How to use the sample
Pan and zoom around the map. Observe how the map is displayed using the World Bonne spatial reference.
How it works
Create a Map object using a spatial reference e.g. Map(SpatialReference.create(54024)).
Create a Basemap object using an ArcGISMapImageLayer object.
Set the base map to the map.
Set the map to a MapView object.
The ArcGIS map image layer will now use the spatial reference set to the ArcGIS map (World Bonne (WKID: 54024)) and not it's default spatial reference.
Relevant API
ArcGISMapImageLayer
Basemap
Map
MapView
SpatialReference
Additional information
Operational layers will automatically project to this spatial reference when possible.
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// [WriteFile Name=SetMapSpatialReference, Category=Maps]// [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]#ifdef PCH_BUILD#include"pch.hpp"#endif// PCH_BUILD#include"SetMapSpatialReference.h"#include"Map.h"#include"MapQuickView.h"#include"Basemap.h"#include"SpatialReference.h"#include"ArcGISMapImageLayer.h"#include"MapViewTypes.h"#include<QUrl>usingnamespace Esri::ArcGISRuntime;
SetMapSpatialReference::SetMapSpatialReference(QQuickItem* parent) :
QQuickItem(parent)
{
}
SetMapSpatialReference::~SetMapSpatialReference() = default;
voidSetMapSpatialReference::init(){
qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
qmlRegisterType<SetMapSpatialReference>("Esri.Samples", 1, 0, "SetMapSpatialReferenceSample");
}
voidSetMapSpatialReference::componentComplete(){
QQuickItem::componentComplete();
// find QML MapView component m_mapView = findChild<MapQuickView*>("mapView");
m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);
// Create a new map with the spatial reference m_map = newMap(SpatialReference(54024), this);
// create the URL pointing to the map image layerQUrl imageLayerUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer");
// construct the ArcGISMapImageLayer using the URL m_imageLayer = newArcGISMapImageLayer(imageLayerUrl, this);
// create a Basemap and pass in the ArcGISMapImageLayer m_basemap = newBasemap(m_imageLayer, this);
// set the ArcGISMapImageLayer as basemap m_map->setBasemap(m_basemap);
// set map on the map view m_mapView->setMap(m_map);
}