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Hi Grant,</div>
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Are you providing a web map service for this imagery?</div>
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KInd regards,</div>
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<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: rgb(31, 73, 125);">Patrick Ric-Hansen</span></p>
<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: rgb(127, 127, 127);">GIS Practitioner PGP0122</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Africa <africa-bounces@lists.osgeo.org> on behalf of Grant Slater via Africa <africa@lists.osgeo.org><br>
<b>Sent:</b> Tuesday, 02 July 2024 14:51<br>
<b>To:</b> Africa local chapter discussions <africa@lists.osgeo.org><br>
<b>Cc:</b> Grant Slater <openstreetmap@firefishy.com><br>
<b>Subject:</b> [OSGeo Africa] South African NGI 25cm Imagery available online</font>
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<div class="PlainText">Hi OSGeo Africa,<br>
<br>
Since 2017, the South African National Geo-spatial Information (NGI)<br>
has been capturing and making available aerial imagery at an<br>
impressive 25cm resolution. NGI is nearing the completion of capturing<br>
the entire country at this resolution. More details can be found here:<br>
<a href="https://ngi.dalrrd.gov.za/index.php/what-we-do/aerial-photography-and-imagery/35-colour-digital-aerial-imagery-at-0-5m-gsd-2008-2016-and-0-25m-gsd-2017-current">https://ngi.dalrrd.gov.za/index.php/what-we-do/aerial-photography-and-imagery/35-colour-digital-aerial-imagery-at-0-5m-gsd-2008-2016-and-0-25m-gsd-2017-current</a><br>
<br>
Through multiple trips to the NGI office in Cape Town, I, along with<br>
others, have collected copies of this imagery. To help with this task,<br>
I had to purchase a 22TB external drive.<br>
<br>
I have now processed the imagery and made it available online:<br>
<br>
<a href="https://aerial.openstreetmap.org.za/">https://aerial.openstreetmap.org.za/</a><br>
<br>
For further discussion about the imagery, visit: OpenStreetMap Community:<br>
<a href="https://community.openstreetmap.org/t/new-25cm-aerial-photos-available-from-chief-directorate-national-geo-spatial-information-cd-ngi/8452/28">https://community.openstreetmap.org/t/new-25cm-aerial-photos-available-from-chief-directorate-national-geo-spatial-information-cd-ngi/8452/28</a><br>
<br>
QGIS Users:<br>
Here are notes on how to use the imagery in QGIS:<br>
<a href="https://kartoza.com/blog/qgis/how-to-easily-add-south-african-and-namibian-toposheets-as-xyz-tiles-to-qgis">https://kartoza.com/blog/qgis/how-to-easily-add-south-african-and-namibian-toposheets-as-xyz-tiles-to-qgis</a><br>
Use this URL: <a href="https://aerial.openstreetmap.org.za/layer/ngi-aerial/{z}/{x}/{y}.jpg">
https://aerial.openstreetmap.org.za/layer/ngi-aerial/{z}/{x}/{y}.jpg</a><br>
(TMS top-left origin)<br>
<br>
Fun Facts:<br>
* Number of source image files: 44,305 (more when 25cm coverage is completed)<br>
* Cost of 22TB external disk: R8900 (on promotion)<br>
* Source imagery projection: Transverse Mercator Lo17 to Lo33<br>
* Source size: 13,264GB<br>
* Time for conversion to Cloud Optimised GeoTIFF (COG): 55+ days<br>
* COGs with WEBP compression (as used by site): 2,442GB<br>
* Total pixels: Over 21 billion (21,000,000+ megapixels)<br>
* Software stack: gdal, titiler, nginx, podman<br>
<br>
Support / Donations:<br>
Hosting is kindly supported by the OpenStreetMap.org project and<br>
INX-ZA. Donations to support other expenses would be greatly<br>
appreciated.<br>
Donate via PayPal: <a href="https://paypal.me/firefishy">https://paypal.me/firefishy</a><br>
FNB banking account details: Available on request<br>
<br>
A huge thank you to National Geo-spatial Information (NGI) and the<br>
Department of Agriculture, Land Reform and Rural Development (DALRRD)<br>
for providing this fantastic aerial imagery. Special thanks to Adrian,<br>
Glenn, and Zander for their help with the logistics.<br>
<br>
Kind regards,<br>
<br>
Grant<br>
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