Rowan Winsemius

@erxclau @chrispahm Yeah spatial indices make a big difference! It can be tricky to implement them within TurfJS itself because everyones use cases are a little different, but we do where we can :)

@RowanWinsemius @chrispahm Here's how I've been testing things out. I'm also using turf alpha-114, if that makes a difference. github.com/erxclau/inters…

Hey @chrispahm — thanks for creating geos-wasm! I've been working on a website that requires finding thousands of polygon intersections and it was taking over a minute with Turf. After switching over to geos-wasm, I'm down to 10 seconds! 😁

@erxclau @chrispahm Yeah that one should have the relevant fix 😢. How many geoms are you processing? Generally intersect is a pretty complex operation so not surprising that it takes a while. Would be interesting to pass them through jsts and see how that goes in comparison.

@RowanWinsemius @chrispahm Yup! I was using 7.0.0-alpha.2

@alexgleith @dinomirMT PlanetaryComputer faced similar and from what I can tell they basically ended up splitting into a MultiPolygon. So depending on your fuller stack there might be some ideas in github.com/stactools-pack…

@dinomirMT Totally bonkers. I don't know that there's any way to fix this, in postgis! My issue is doing a ST_Transform of a projected, antimeridian-crossing polygon results in something that is basically wrong... it's a real pain, and I don't know any workarounds!

So, speaking of antimeridian shenanigans. Is there a way in PostGIS to handle transformation from a projected CRS to an "antimeridian-sane" geography or geometry? Currently my nice little square is getting absolutely destroyed by an ST_Transform to `epsg:4326`

@jo_chemla @FSQStudio @felt @CARTO @heavy_ai @Esri If you're prepared to self-host then @TerriaJS might be an option. It supports loads of formats out of the box. terria.io

@FSQStudio @felt - @CARTO can also import from remote but again will probably freeze the data on their data warehouse #importing-methods" target="_blank" rel="nofollow noopener">docs.carto.com/carto-user-man… - @heavy_ai again seems to aprse the data once and for all docs.heavy.ai/loading-and-ex… - @Esri probably could help Anyone has a potential fit in mind? Thanks!

Hi #geospatial! Looking for advice I'd like to build a demonstrator which fetches remote geo datasets from endpoints which update regularly - a mix of geojson urls, WFS, pbf, arcgis REST, WMS, TMS etc In order to aggregate them on a map All sources loaded on a @qgis project: ✅

@stevage1 I kicked the tyres on @stytchauth a while ago and was happy with it stytch.com Lots of options and pretty good docs

Question for web developers: What auth platform do you like better than Auth0?

@stephenlead @briantimoney Still relevant 10+ years later - has always stuck in my memory back!

@RowanWinsemius @briantimoney YES! That's the one - many thanks for helping to unearth it

#gischat many years ago someone did a great analysis, tweet or blog post about why most of the things we add to web maps / data portals are useless, and not used by 99% of people. Eg the measure tool, coordinate conversion, etc. Does anyone know where this is located? Thanks

@SimonGIS The closest I've played with was some Sydney ferry data. It had passenger numbers for different trips etc. Half-started a map-based visualisation but never finished it off completely

Anyone seen a dataset similar to the NYC Taxi one but in Australia? Trip locations with start/end locations? nyc.gov/site/tlc/about…

@stevage1 Depending on requirements things like simplifying your geometries and making sure you only store the required decimal precision make a big difference. But yep there will be times when adding to the stack using a DB or whatever becomes the only option.

@RowanWinsemius I'm also a bit concerned about leaving all the polygons in memory. It's a small server. But I won't know till I get the full dataset.

Ok, here's what I'm trying to do: Node backend process to receive a polygon and compute all intersections between it and a stored set of polygons (hundreds), then compute area of each, quickly. What tools? Turf too slow I think. Prefer w/o Postgres. Ideas? #gischat

@alexgleith Actually I think it's EPSG:8857

@alexgleith How about the 2017-18 Equal Earth projection ? shadedrelief.com/ee_proj/ EPSG:1078 Pretty sure it's widely supported.

Is there a global "Equal Earth" CRS in Proj now, compatible with GDAL and referenced with an EPSG code?

@tmcw I tried out Stytch recently and found it pretty good to work with, I hadn't heard of it before but it had the features I was looking for in a hosted auth solution. stytch.com

@getbounds Fun! Does it handle reprojection on the fly, or does the COG need to be in web mercator? I tried a pure js approach a while back but reprojection was my biggest challenge github.com/rowanwins/geot…

hey #gis #gischat #dataviz #localgov folks - I made something - it's a #raster tile ortho image server written in #javascript tilestream.xyz

@alexgleith @petegadomski @matthmohr @STACspec @foss4gna TiTiler can give you either a WMS or WMTS (can't remember which) from a STAC reference. Guess the difference is you need the STAC reference first, rather than pre-configuring all the layers

@petegadomski @matthmohr @STACspec @foss4gna I'm loving working with pypgstac, stac-fastapi, pystac-client and odc-stac... It's a really nice stack (heh). What I haven't got working nicely, outside the old OpenDataCube world, is a WMS server... If anyone is driving one of those of a pypgstac DB, I'd love to know!

i made a quick little diagram of the @STACspec software ecosystem for the sprint this week what'd i miss? does this layout makes sense? how do you think about these things? (asking for a friend who will be talking about the same stuff at @foss4gna in about a month)

@alexgleith @stevage1 Some of the buildings even have logos on them! And interesting & great to see the adoption of the Cesium B3DM spec, rather than another new way of distributing that style of data.

@stevage1 I just spent like 5 minutes zooming in and out. The trees are super pretty!

I have absolutely no idea if Mapbox's new 3d buildings style is going to be useful for anything, but boy it looks pretty. Is it really called Mapbox Standard though? mapbox.com/blog/standard-…

@MikeTreglia @cogeotiff @LeafletJS My general experience is that a TiTiler instance gives best performance and flexibility. However if your COGs are web mercator and well tiled then clientside does work, eg georaster-layer-for-leaflet github.com/GeoTIFF/georas…

#gischat - any favorite worked examples for displaying COGs (both multiband and single band w/ color map) in a webmap? I've struggled, esp. w/ larger @cogeotiff files, and would love to finally "get" it Pluses if it has a legend and is in @LeafletJS

@tibo_maker The ability for the user to choose between using the old twitter logo/branding or the new X logo/branding.

You're Elon Musk. What is the next feature you'll add to 𝕏? The reply with the most likes within 48 hours gets a MacBook Pro M2! 💻 Feeling extra generous today

@robinlovelace @martinfleis This sounds like an interesting problem! I guess most simplification algorithms work on a per geometry basis, rather than considering surrounding geoms. I wonder how vector tile generation handles this - @enf might have some ideas from Tippecanoe world?

Credit to @martinfleis for great explanation in this blog post, plus reproducible #Python code (tested: works great): martinfleischmann.net/line-simplific… Any ideas Martin or anyone else reading this? 🙏

Playing with network simplification methods... Visvalingam algorithm way more effective, but seems unable to merge parallel lines on more complex networks. Any ideas on how to do this? A short thread with links... First-up: Visvalingam works well for simple example!