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Rowan Winsemius @rowanwinsemius.bsky.social · 09/01/2026

I've done something similar with leaflet but reprojecting was always a pain point

Rowan Winsemius @rowanwinsemius.bsky.social · 09/01/2026

This looks awesome, well done @kylebarron.dev ! Do you think the @developmentseed/raster-reproject piece is general enough that it should be used for other clientside reprojection?

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Rowan Winsemius @rowanwinsemius.bsky.social · 15/03/2025

I try to be open to using both - have them both in the toolbox, and use the right one depending on the project requirements.

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Rowan Winsemius @rowanwinsemius.bsky.social · 15/03/2025

In my experience ESRI works very well when everything and everyone is using it, but the real world is messier than that. And the other is big wow is what no licensing costs unlocks for certain environments/projects - cost can eventually become prohibitive in an esri-based setup.

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Rowan Winsemius @rowanwinsemius.bsky.social · 15/03/2025

Depends a bit on the desired use case as to what might wow them. But for me one of the big ones of data interoperability - support for different formats, and connectability of different systems.

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Rowan Winsemius @rowanwinsemius.bsky.social · 08/01/2025

I haven't released the Claude implementation yet as it's pretty slow. It seems to generate a set of simplifications up front, and then you can send a subsequent query for the level of simplification you want which is then very fast. I need more time to poke at the paper.

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Rowan Winsemius @rowanwinsemius.bsky.social · 08/01/2025

I was reading a recently released paper last week on line simplification - no fancy videos though! So I asked ClaudeAI to implement it for me and it did 🤯 drops.dagstuhl.de/storage/00li...

drops.dagstuhl.de

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Rowan Winsemius @rowanwinsemius.bsky.social · 06/12/2024

I previously arranged sponsorship through an ex-employer and it was easier than I thought it would be, so i'd encourage anyone who knows what value their org gets out of GDAL to give it a go and have that conversation or write that paper, the worst that can happen is they say no!

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Rowan Winsemius @rowanwinsemius.bsky.social · 06/12/2024

So good to see a government dept getting behind this - wild to think yours might be the first given the vast majority would rely on GDAL in a significant fashion either directly or indirectly.

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Rowan Winsemius @rowanwinsemius.bsky.social · 27/11/2024

To be fair the actual netcdf part wasn't too bad, it was post-processing we did that was the hard part, particularly with the World Ocean Database, which is a massive point dataset of water data used to generate the Atlas raster.

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Rowan Winsemius @rowanwinsemius.bsky.social · 27/11/2024

A similar product is the World Ocean Atlas from NOAA - it has info like water temperature at diff depths over time. It's netcdf and I once wrote a horribly long python script to download and process it 😂 www.ncei.noaa.gov/products/wor...

ncei.noaa.gov

World Ocean Atlas

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Rowan Winsemius @rowanwinsemius.bsky.social · 26/11/2024

That is the most detailed anyone had ever digitised a palm tree 🌴 !

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Rowan Winsemius @rowanwinsemius.bsky.social · 20/11/2024

Published a long overdue update to my js sweepline-intersections library to make use of the excellent robust-predicates library for improved intersection detection. github.com/rowanwins/sw... This library is downloaded >100k times a week thanks to TurfJS which is a tad scary when doing a release 😅

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Rowan Winsemius @rowanwinsemius.bsky.social · 20/11/2024

🎉 awesome. FWIW there is no perfect solution for this stuff, lots of pros and cons with diff formats, but my general experience is that flatgeobuf is a bit easier to use, esp for non-developers, but hopefully with time geoparquet support will improve & APIs will get simpler.

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Rowan Winsemius @rowanwinsemius.bsky.social · 20/11/2024

For anyone interested in displaying a flatgeobuf file efficiently on a maplibre-gl / mapbox-gl map I've created a little library that helps make tiled requests to your flatgeobuf datasource, this is particularly handy if your datasource is very large. github.com/rowanwins/ma...

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Rowan Winsemius @rowanwinsemius.bsky.social · 20/11/2024

Looks like a spatial index creation is opt-out via GDAL, so geopandas probably follows suite. gdal.org/en/latest/dr...

gdal.org

FlatGeobuf — GDAL documentation

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Rowan Winsemius @rowanwinsemius.bsky.social · 20/11/2024

I'm not sure you can create a flatgeobuf file that doesn't have a spatial index

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Rowan Winsemius @rowanwinsemius.bsky.social · 20/11/2024

I believe yes, but that's a guess... If it's loading quickly in qgis that's probably a good sign that it has

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Rowan Winsemius @rowanwinsemius.bsky.social · 20/11/2024

Depending on intended use flatgeobuf is perhaps a smidge easier to use in a web browser. Geoparquet requires some more complicated dependencies, but I'm probably about 1 year behind in my last muck about with it so things may have improved.

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Rowan Winsemius @rowanwinsemius.bsky.social · 20/11/2024

Either flatgeobuf or geoparquet would be pretty good options, both support getting data in a bounding box, and have gdal support

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Rowan Winsemius @rowanwinsemius.bsky.social · 19/11/2024

In the good ol' days we had an #augischat at a sensible time, most weeks probably had 10-20ish participants. I'm a bit less spatial at the moment but happy to contribute a thumbs up for what works in Aus are doing 😂

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Rowan Winsemius @rowanwinsemius.bsky.social · 18/11/2024

This is a neat idea! Did you any particular use case in mind? One that came to mind for me was crowd-sourcing validation tasks, or a pre-check on geometry edits (eg hey these changes look wildly different, are you sure you want to proceed)

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