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<p class="MsoNormal">Greetings all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I hope everyone had a nice holiday and at least enjoyed a few days off. I know I did even though the fall/winter holidays always seem to catch me by surprise. Maybe one of these years I’ll pay attention to the calendar!<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">I’ve talked to a few of you over the past several months about the statewide photogrammetric point cloud/DSM that is available as an option through our 2024 OSIP contract for $115,000. The legislative funding made available for the 2024
imagery did not include enough for this purchase so if there is interest in this product the money must come from stakeholders.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This message is therefore a call for anyone with interest and funding to put towards the purchase. At this point there have been no contributions.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Our vendor Surdex has supplied a preliminary sample of a couple tiles (.las format) and I wanted to share those out. They can be downloaded from here:
<a href="https://files.oprd.oregon.gov/index.php/s/Dib2B4KgLf8LZYs">https://files.oprd.oregon.gov/index.php/s/Dib2B4KgLf8LZYs</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Note: The color in these sample tiles is 16bit and from pre-processed images so does not appear correct or as it will in the delivered orthophotography. I discussed this with Surdex and they have told me that an actual point cloud deliverable
will have color correction to closer match the final orthos.<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">I have attached a copy of the USDA specifications for this type of product, we used these when we purchased this product in 2022 and would be using them again this time if we were to move forward.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There are many different terms used for this type of data and the methods used to produce them, but this is an elevation product derived from various computer vision methods based on the underlying principles of stereo imaging. While results
use the same data format and can look like lidar, they are based on photogrammetry and passive remote sensing as opposed to an active sensor. A ramification of this difference is that photogrammetric point clouds do not depict the terrain under canopy well
since the camera used cannot ‘see’ the ground. They are further limited in that points are produced only where pixels are matched between multiple images and are therefore heavily dependent on image quality and the performance of underlying algorithms.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please reach out to me if you have any questions.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><i><span style="font-family:"Calibri",sans-serif;color:#007A37;letter-spacing:2.0pt;mso-ligatures:none">Brady Callahan, GISP
</span></i></b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Geospatial Lead, sUAS Coordinator, Oregon Imagery FIT Lead<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:3.0pt;font-family:"Calibri",sans-serif;color:#A6A6A6;mso-ligatures:none">___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________</span></b><span style="font-family:"Tahoma",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;color:#348AA2;letter-spacing:1.0pt;mso-ligatures:none">Oregon Parks and Recreation Department</span></b><span style="font-family:"Tahoma",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none">503.551.1871<o:p></o:p></span></p>
<p class="MsoNormal"><a href="http://stateparks.oregon.gov/"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none;text-decoration:none">stateparks.oregon.gov</span></a><span style="font-family:"Calibri",sans-serif;color:blue;mso-ligatures:none">
| </span><a href="http://oregon.gov/oprd"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none;text-decoration:none">oregon.gov/oprd</span></a><span style="mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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