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

[Frank Sokolic]

Hi Grant,

Thanks for making this available. It's an amazing resource.

Frank.

On 2024/07/02 14:51, Grant Slater via Africa 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
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