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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">Hi Roman,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">I'm not sure how you would determine the kill time. Each individual call to GetFeatureCount is fairly quick, but when you're doing it a lot, in a loop, they add up. Here's an example
output from the Python profiler:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:black"> ncalls tottime percall cumtime percall filename:lineno(function)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:black"> 195 98.689 0.506 98.690 0.506 {built-in method osgeo._ogr.Geometry_Intersection}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:black"> 4091 40.792 0.010 40.860 0.010 {built-in method osgeo._ogr.Geometry_Union}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:black"> 8358 33.862 0.004 33.862 0.004 {built-in method osgeo._ogr.Layer_GetFeatureCount}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:black"> 28653 17.059 0.001 17.115 0.001 {built-in method osgeo._ogr.Layer_GetNextFeature}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">Obviously, I could be calling the feature count less often, but I was hoping I could shave a small amount of time off each call. Also obviously, my geometry operations are more costly
than the feature operations, but it's worth trying to save time anywhere you can.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">Jon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Roman Breitfuss-Schiffer <roman.schiffer@gmail.com>
<br>
<b>Sent:</b> 20 January 2022 10:38<br>
<b>To:</b> Jon Morris <Jon.Morris@jbarisk.com>; gdal-dev@lists.osgeo.org<br>
<b>Subject:</b> Re: [gdal-dev] Faster alternative to GetFeatureCount?<o:p></o:p></span></p>
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<p><span style="font-family:"Tahoma",sans-serif">Hi Jon!</span><o:p></o:p></p>
<p><span style="font-family:"Tahoma",sans-serif">I don't know if there's an alternative to GetFeatureCount. At least I couldn't find one in the API documentation. Maybe there's a workaround I'm not aware of...</span><o:p></o:p></p>
<p><span style="font-family:"Tahoma",sans-serif">What you could do is wrap the call of GetFeatrueCount in a function which is killed after some time (2 approaches are discussed here:
<a href="https://stackoverflow.com/questions/40915527/kill-function-after-a-given-amount-of-time">
https://stackoverflow.com/questions/40915527/kill-function-after-a-given-amount-of-time</a>). With that approach the question remains of getting the value of GetFeatureCount when the function gets killed. One could assume that there are more features than 1
if the function takes too long. This assumption might be a bit risky though...</span><o:p></o:p></p>
<p><span style="font-family:"Tahoma",sans-serif">Best regards<br>
Roman</span><o:p></o:p></p>
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<p class="MsoNormal">Am 20.01.2022 um 10:00 schrieb Jon Morris:<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">I'm writing applications using the GDAL Python bindings and when I profile for performance, GetFeatureCount frequently comes out near the top. I'm often using it to check whether
a spatial or attribute filter has returned any features and don't need the full count. When the layer contains millions of features, there would be a big performance improvement if we could exit the count early.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">Is there a better way of doing this? I've tried using GetNextFeature instead, but there must be quite a lot of overhead in that function as it is much slower. All I need to know is
if the layer has has 0, 1 or >1 features, I don't need the actual count. Can anyone suggest the fastest way of doing this in Python? I'm using GDAL 3.3.1 at the moment but could upgrade if there is new functionality that would help.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">Jon</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#F6A124;mso-fareast-language:EN-GB">Jon Morris</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#4A4A49;mso-fareast-language:EN-GB">Software Developer</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<pre>gdal-dev mailing list<o:p></o:p></pre>
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