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IdentifyLayers is much slower with BasemapType::imagery than with BasemapType::streets

MarcWouters

In our application we switch between a street view basemap and a satellite view basemap.

 if (satelliteView) {
    _map->setBasemap(Basemap::imagery(this));
 }
 else {
    _map->setBasemap(Basemap::streets(this));
 }

When the imagery is selected, finding features on the map (using IdentifyLayers) becomes suddenly much slower : up to 20 seconds before the identifyLayersCompleted signal is received.

What is the reason for this slow behaviour, and how can I prevent or bypass this ?

Thanks for any suggestions.

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Accepted answers

LucasDanzinger

Interesting, I too can reproduce this with the below code. If you have a technical support, I suggest you open a case so they can file an official bug report. Thank you.

<SPAN class="comment token">// Create the Widget view</SPAN>
m_mapView <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token function">MapGraphicsView</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
m_mapView<SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN><SPAN class="token function">setWrapAroundMode</SPAN><SPAN class="punctuation token">(</SPAN>WrapAroundMode<SPAN class="operator token">::</SPAN>Disabled<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

m_map <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token function">Map</SPAN><SPAN class="punctuation token">(</SPAN>Basemap<SPAN class="operator token">::</SPAN><SPAN class="token function">streets</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="comment token">//m_map = new Map(Basemap::imagery(this), this);</SPAN>

<SPAN class="token function">connect</SPAN><SPAN class="punctuation token">(</SPAN>m_mapView<SPAN class="punctuation token">,</SPAN> <SPAN class="operator token">&</SPAN>MapGraphicsView<SPAN class="operator token">::</SPAN>mouseClicked<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="operator token">=</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">(</SPAN>QMouseEvent e<SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">{</SPAN>
&nbsp; QDateTime date<SPAN class="punctuation token">;</SPAN>
&nbsp; m_startTime <SPAN class="operator token">=</SPAN> date<SPAN class="punctuation token">.</SPAN><SPAN class="token function">currentMSecsSinceEpoch</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; m_mapView<SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN><SPAN class="token function">identifyLayers</SPAN><SPAN class="punctuation token">(</SPAN>e<SPAN class="punctuation token">.</SPAN><SPAN class="token function">x</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> e<SPAN class="punctuation token">.</SPAN><SPAN class="token function">y</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">10</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="token boolean">false</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">100</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="token function">connect</SPAN><SPAN class="punctuation token">(</SPAN>m_mapView<SPAN class="punctuation token">,</SPAN> <SPAN class="operator token">&</SPAN>MapGraphicsView<SPAN class="operator token">::</SPAN>identifyLayersCompleted<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="operator token">=</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">{</SPAN>
&nbsp; QDateTime date<SPAN class="punctuation token">;</SPAN>
&nbsp; <SPAN class="token function">qDebug</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token"><<</SPAN> <SPAN class="string token">"identify done. time elapsed"</SPAN> <SPAN class="operator token"><<</SPAN> date<SPAN class="punctuation token">.</SPAN><SPAN class="token function">currentMSecsSinceEpoch</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">-</SPAN> m_startTime<SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="comment token">// Set map to map view</SPAN>
m_mapView<SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN><SPAN class="token function">setMap</SPAN><SPAN class="punctuation token">(</SPAN>m_map<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="comment token">// set the mapView as the central widget</SPAN>
<SPAN class="token function">setCentralWidget</SPAN><SPAN class="punctuation token">(</SPAN>m_mapView<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

LucasDanzinger

Interesting, I too can reproduce this with the below code. If you have a technical support, I suggest you open a case so they can file an official bug report. Thank you.

<SPAN class="comment token">// Create the Widget view</SPAN>
m_mapView <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token function">MapGraphicsView</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
m_mapView<SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN><SPAN class="token function">setWrapAroundMode</SPAN><SPAN class="punctuation token">(</SPAN>WrapAroundMode<SPAN class="operator token">::</SPAN>Disabled<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

m_map <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token function">Map</SPAN><SPAN class="punctuation token">(</SPAN>Basemap<SPAN class="operator token">::</SPAN><SPAN class="token function">streets</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="comment token">//m_map = new Map(Basemap::imagery(this), this);</SPAN>

<SPAN class="token function">connect</SPAN><SPAN class="punctuation token">(</SPAN>m_mapView<SPAN class="punctuation token">,</SPAN> <SPAN class="operator token">&</SPAN>MapGraphicsView<SPAN class="operator token">::</SPAN>mouseClicked<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="operator token">=</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">(</SPAN>QMouseEvent e<SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">{</SPAN>
&nbsp; QDateTime date<SPAN class="punctuation token">;</SPAN>
&nbsp; m_startTime <SPAN class="operator token">=</SPAN> date<SPAN class="punctuation token">.</SPAN><SPAN class="token function">currentMSecsSinceEpoch</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; m_mapView<SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN><SPAN class="token function">identifyLayers</SPAN><SPAN class="punctuation token">(</SPAN>e<SPAN class="punctuation token">.</SPAN><SPAN class="token function">x</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> e<SPAN class="punctuation token">.</SPAN><SPAN class="token function">y</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">10</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="token boolean">false</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">100</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="token function">connect</SPAN><SPAN class="punctuation token">(</SPAN>m_mapView<SPAN class="punctuation token">,</SPAN> <SPAN class="operator token">&</SPAN>MapGraphicsView<SPAN class="operator token">::</SPAN>identifyLayersCompleted<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="operator token">=</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">{</SPAN>
&nbsp; QDateTime date<SPAN class="punctuation token">;</SPAN>
&nbsp; <SPAN class="token function">qDebug</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token"><<</SPAN> <SPAN class="string token">"identify done. time elapsed"</SPAN> <SPAN class="operator token"><<</SPAN> date<SPAN class="punctuation token">.</SPAN><SPAN class="token function">currentMSecsSinceEpoch</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">-</SPAN> m_startTime<SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="comment token">// Set map to map view</SPAN>
m_mapView<SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN><SPAN class="token function">setMap</SPAN><SPAN class="punctuation token">(</SPAN>m_map<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="comment token">// set the mapView as the central widget</SPAN>
<SPAN class="token function">setCentralWidget</SPAN><SPAN class="punctuation token">(</SPAN>m_mapView<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

RichardMcGough

I'm having the same problem. I'm using ArcGISRuntime 100.6. Does anyone know if a solution or workaround has been found for this bug?

LucasDanzinger

Hi Richard - It has not been fixed yet. The workaround is to loop through your operational layers and call identifyLayer on the ones you explicitly want to identify on - this will leave the basemap out of the equation and will allow you to further fine tune which operational layers participate in the identify (identifyLayers with an "s" will perform an identify on every layer in the map including basemaps).

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