[OSGeo Africa] South African NGI 25cm Imagery available online

[Gerhardus Geldenhuis]

Hi Grant,
Just a small public thank you for all the effort and personal money that
you have invested in this project and also to everyone else that has helped
with getting this done. It is not just the cost but also the many many
hours of work that has gone into making this an easy to use resource for
the rest of us.

I also want to make this a call to arms, for anyone that benefits from this
work personally or as a GIS professional using this, to consider making a
contribution towards Grant's personal expenses.

Regards

On Tue, 2 Jul 2024 at 13:52, Grant Slater via Africa <africa at lists.osgeo.org>
wrote:

> Hi OSGeo Africa,
>
> Since 2017, the South African National Geo-spatial Information (NGI)
> has been capturing and making available aerial imagery at an
> impressive 25cm resolution. NGI is nearing the completion of capturing
> the entire country at this resolution. More details can be found here:
>
> 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
>
> Through multiple trips to the NGI office in Cape Town, I, along with
> others, have collected copies of this imagery. To help with this task,
> I had to purchase a 22TB external drive.
>
> I have now processed the imagery and made it available online:
>
> https://aerial.openstreetmap.org.za/
>
> For further discussion about the imagery, visit: OpenStreetMap Community:
>
> https://community.openstreetmap.org/t/new-25cm-aerial-photos-available-from-chief-directorate-national-geo-spatial-information-cd-ngi/8452/28
>
> QGIS Users:
> Here are notes on how to use the imagery in QGIS:
>
> https://kartoza.com/blog/qgis/how-to-easily-add-south-african-and-namibian-toposheets-as-xyz-tiles-to-qgis
> Use this URL:
> https://aerial.openstreetmap.org.za/layer/ngi-aerial/{z}/{x}/{y}.jpg
> (TMS top-left origin)
>
> Fun Facts:
> * Number of source image files: 44,305 (more when 25cm coverage is
> completed)
> * Cost of 22TB external disk: R8900 (on promotion)
> * Source imagery projection: Transverse Mercator Lo17 to Lo33
> * Source size: 13,264GB
> * Time for conversion to Cloud Optimised GeoTIFF (COG): 55+ days
> * COGs with WEBP compression (as used by site): 2,442GB
> * Total pixels: Over 21 billion (21,000,000+ megapixels)
> * Software stack: gdal, titiler, nginx, podman
>
> Support / Donations:
> Hosting is kindly supported by the OpenStreetMap.org project and
> INX-ZA. Donations to support other expenses would be greatly
> appreciated.
> Donate via PayPal: https://paypal.me/firefishy
> FNB banking account details: Available on request
>
> A huge thank you to National Geo-spatial Information (NGI) and the
> Department of Agriculture, Land Reform and Rural Development (DALRRD)
> for providing this fantastic aerial imagery. Special thanks to Adrian,
> Glenn, and Zander for their help with the logistics.
>
> Kind regards,
>
> Grant
> _______________________________________________
> Africa mailing list
> Africa at lists.osgeo.org
> You can UNSUBSCRIBE at https://lists.osgeo.org/mailman/listinfo/africa
>


-- 
Gerhardus Geldenhuis
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/africa/attachments/20240703/638bd647/attachment.htm>