<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body dir="auto"><div dir="auto">Hi Loke.</div><div dir="auto"><br></div><div dir="auto">A couple of comments. </div><div dir="auto"><br></div><div dir="auto">1) The 95 % success rate is very good. If you were to have a close look at the missed trees you may realize that the highest point on a particular palm tree is lower than the neighboring tree or palm frond. What ever algorithm you use, you are limited by the physical data, accuracy and resolution being the key factors. The physical condition of the trees you are trying to identify also plays a role,as mentioned previously. A DSM is an approximation as it is derived from some form of point data, either lidar or photo based and then generated by extracting the maximum, 95th percentile, maximum or perhaps the average height if all the points that land in a cell. </div><div dir="auto"><br></div><div dir="auto">Your issue is a limitation of the data and the basic logic of a max/minima algorithm. It cannot detect what is not reflected in the data. You can interpret the colour imagery but have a look at the dsm at the missed maxima.</div><div dir="auto"><br></div><div dir="auto">You could try developing a routine by processing the,raw point cloud data or try generating a dsm yourself. </div><div dir="auto"><br></div><div dir="auto">You can also try changing the algorithm parameters. Perhaps in areas if missed maxima. Although, this may not be effective as the maxima you are looking for probably is not reflected the dem.</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">2) Plug-ins,are created by third parties and not by the Qgis team directly. You can reach out to the author and discuss with him/her. </div><div dir="auto"><br></div><div dir="auto">Kirk Schmidt</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div id="composer_signature" dir="auto"><div style="font-size:12px;color:#575757" dir="auto">Sent from my Galaxy</div></div><div dir="auto"><br></div><div><br></div><div align="left" dir="auto" style="font-size:100%;color:#000000"><div>-------- Original message --------</div><div>From: Loke Jian Munn via QGIS-User <qgis-user@lists.osgeo.org> </div><div>Date: 2023-06-01 6:28 a.m. (GMT-04:00) </div><div>To: qgis-user@lists.osgeo.org </div><div>Cc: Moke Kwai Cheong <kc.moke@klk.com.my>, Cheong Chee Phang <cp.cheong@klk.com.my>, Leong Kah Choon <kc.leong@klk.com.my>, Mulwanto <mulwanto@klk.co.id>, Endang Sudita Prayoga <endang.sp@klk.co.id>, M Rizki Ramdani <rizki.r@klk.co.id>, Fira Yunita <fira.y@klk.co.id>, Qurata Ayun Wijanarko <qurata.aw@klk.co.id> </div><div>Subject: [Qgis-user] Palm Counting using QGIS </div><div><br></div></div>
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<p class="MsoNormal">Hi Team,</p>
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<p class="MsoNormal">We have been using QGIS to do Palm Counting. </p>
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<p class="MsoNormal">Palm Counting here mean oil palm, we use QGIS processing tool, Features-Raster Tools (Local Minima and Maxima) to do the counting on a DSM layer.</p>
<p class="MsoNormal">Example as below:</p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"MS PGothic",sans-serif;mso-fareast-language:ZH-TW"><img src="cid:com_samsung_android_email_attachmentprovider_1_940_RAW_1685611935838" id="Picture_x0020_43" style="width: 8.0208in; height: 4.2812in;" height="411" width="770" onmouseover="imageMousePointerUpdate(true)" onmouseout="imageMousePointerUpdate(false)" name="com_samsung_android_email_attachmentprovider_1_940_RAW_1685611935838"></span></p>
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<p class="MsoNormal">Based on our industrial experiences, the accuracy of the Local Maxima algorithm is approximately 90%-95%. However, we still need to do toggle editing such as we utilize the “ Add Point Feature “ function when there are points missed, the
“Vertex Tool” is used to adjust the position of points and the “Select Feature” for removal of any unnecessary points.</p>
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<p class="MsoNormal">We would like to have an improvement plan on the accuracy for
<b><span style="background:yellow;mso-highlight:yellow">more than</span></b> 95% to reduce the extra manual works ( toggle edit ).</p>
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<p class="MsoNormal">Appreciate if the team could share with us any latest QGIS palm count plugin or any other solutions to achieve the accuracy more than 95% when doing palm count.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Your input is highly appreciated. Thank you.</p>
<p class="MsoNormal"> </p>
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<p class="MsoNormal">Regards,</p>
<p class="MsoNormal"><b><span style="color:#005826;letter-spacing:-.3pt;mso-fareast-language:ZH-TW">Loke Jian Munn</span></b><span style="font-size:12.0pt;font-family:"MS PGothic",sans-serif;mso-fareast-language:ZH-TW" lang="EN-US"></span></p>
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