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Mark Litwintschik
1.3K posts
Mark Litwintschik
@marklit82
Consultant & author of https://t.co/HNdj0ZcIER
Tallinn, Estonia Katılım Mart 2009
247 Takip Edilen3.6K Takipçiler
This is a 97 GB GeoTIFF in QGIS 4. No tiling, just dropped the image into the app and it loaded right away.
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@mirgray There are guys driving trucks around Canada scanning the roads with lasers. Satellites could never compete on a cost basis with these rigs.
Viimsi, Eesti 🇪🇪 English
As others have commented, this is good enough resolution to see potholes ie plan road inspection work orders from an office.
Mark Litwintschik@marklit82
There is now ~100 TB of imagery as fine as 4cm of Quebec making its way to S3. One of these images is to the left and for comparison, Google Map's image of the same location to the right.
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@mooreaa Yeah, the province published it. There is a LinkedIn link elsewhere in this thread with a URL to the official dataset and it has links to a server with the imagery.
Viimsi, Eesti 🇪🇪 English
@marklit82 Wow, what is this dataset for? Any chance for public access?
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There is now ~100 TB of imagery as fine as 4cm of Quebec making its way to S3.
One of these images is to the left and for comparison, Google Map's image of the same location to the right.
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There are 327 wind farms in Canada now. The US has 2K. I normally take whatever metric the US has and divide by 10 to get an idea of how Canada is doing. It'll be interesting to watch this space grow over the next few years.
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Natural Resources Canada refreshed their Wind Turbine dataset in November. tech.marksblogg.com/canadian-wind-…
The map below shows the most prominent turbine manufacturer by hexagon across Canada.
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There are only three provinces in Canada with at least a GW of wind capacity which is a little surprising.
This decade has seen turbines with capacities of 4 - 7 MW being installed for the first time. Before 2020, every turbine was under 4 MW.
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Vestas ranks first for installations followed by General Electric and Siemens.
Alberta is approaching 6 GW of Wind capacity. This 1.1 GW / million inhabitants isn't too far of Texas' ratio of 1.34.
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The above speed up is based on converting a 15.8M-row, 28-column dataset of Canada's addresses. It took 26 hours 24 minutes 35 seconds in v1.4.4 but only 4 minutes 49 seconds in v1.5.0.
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GeoPackage still has a place in a Parquet world if you want to bundle styling and/or edit data afterwards. DuckDB v1.5.0 generates GeoPackage files 328 times faster than v1.4.4. Support for structs in GPKG was also added in this release.
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QGIS 4 reading 9.9M places out of one of Overture's 1.1 GB Parquet files. Seems much more responsive than QGIS 3.
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Make sure the basemap only has a white canvas and nothing else underneath its layer as it'll change the colours on the map.
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HCMGIS has added support for Esri's Charted Territory basemap. If you're showing a few hundred POIs across the globe, this is a great way to make it clear which country those points are in.
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HCMGIS only supports this basemap in QGIS 4 as it was packaged along with a non-backwards-compatible QT6 upgrade.
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Google Maps' borders, especially around Switzerland, are something of an eye test to point out. This basemap is the complete opposite of that and makes boundaries much easier to distinguish.
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