blacha

6 ms·

1.
by blacha 3y ago
Those comments were more at pastmaps. For elevation data, we store our DEM/DSM in S3 as LERC [1] COGS, LERC has a WASM bundle which I think can be used in the browser. We found LERC COGs to be one of the most space efficient ways of st
2.
by blacha 3y ago
Your browser has a very powerful image decoder built into it, offloading the PNG decoding into Javascript is very resource hungry. Using maplibre (or any map viewer) you can load blobs of image data out of a tiff and use `Image` or `Canvas`
3.
by blacha 4y ago
I don't think geojson is a great format for anything with more than a few MB of data. I wanted to see exactly how bad it is with a largeish datasets, so I exported the New Zealand address dataset[1] with ~2.5M points as a geopackage (7
4.
by blacha 4y ago
if you also wanted to pull in a node framework for deserilization you could import something like `zod` to have the similar level of nice error messages when invalid input is encountered. If you were in typescript, zod would also automatica
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by blacha 4y ago
New Zealand regularly uses flying companies to take aerial imagery photos of most of the country, which is generally taken between 30cm and ~2cm, Land Information New Zealand (LINZ) then releases this imagery imagery completely free (CC-BY)
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by blacha 4y ago
are your orthomosaics geo refernced? You could look at storing them as a cloud optimised geotiff (COG) and then adding them directly into your web map.
7.
by blacha 5y ago
> Why not upload those files separately, Doing S3 put requests for 260M files every week would cost around $1300 USD/week which was too much for our budget > or in ZIP format? We looked at zip's but due to the way the header
8.
by blacha 5y ago
This is basically exactly what we do we have created a cloud optimised tar (cotar)[1] by creating a hash index of the files inside the tar. I work with serving tiled geospatial data [2] (Mapbox vector tiles) to our users as slippy maps wher
9.
by blacha 5y ago
New Zealand has 8G/8G to some homes within bigish cities for around $270nzd/mo (~180usd/mo)[1] and most of the population has access to at least 1000up/500down fibre for about $100nzd/mo (~65usd/mo). It how eve
10.
by blacha 5y ago
looks to be using open sea dragon [1] This is just a tiled map so any web mapping software would also work OpenLayers, Leaflet, Maplibre etc. [1] https://openseadragon.github.io/
11.
by blacha 5y ago
Looks to be a service to remove the HTTP referer header when linking to other sites. Say your on example.com and click a a link to foo.com the browser will send the http header `Referer: example.com` in the HTTP get to foo.com, this means f
12.
by blacha 5y ago
New Zealand, with our borders closed my company has had multiple job ads open for intermediate/senior developers for over a year. Every candidate we do interview, generally also has multiple other job offers.
13.
by blacha 5y ago
This is pretty much exactly what we do to serve aerial/satellite imagery maps. We convert the imagery into Cloud optimised geo tiffs and store them in S3 https://www.cogeo.org/ then the browser can request the tiles di
14.
by blacha 5y ago
You can generally query any object off s3 in a few milliseconds.. I have a system doing 10s-100's of millions of reads a day from s3 with very consistent and fast read times.