Alex Leith @alexgleith Twitter profile

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Alex Leith

9 months

Did you know that with 2 Python libraries, 6 lines of code and around 15 seconds, you can load satellite data from anywhere in the world? This is so much easier than it used to be!

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Alex Leith

@alexgleith

11 months

I’m giving away a free license and a free free license as prizes at @georabble tonight!! Happy #GISday 🎉

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Alex Leith

@alexgleith

9 months

Following on from my tweet about loading Sentinel-2 data, here's another example from a while ago for working with NASA's Harmonized Landsat and Sentinel data. This example creates a cloud-free mosaic. You do need an API key, but it's free.

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Alex Leith

@alexgleith

9 months

Here's a new example for finding, loading and visualising Sentinel-2 data. It includes a new `odc.explore()` function that gives you a simple visualisation on an interactive map. Credit to @Kirill_kzb and @SatelliteSci for that new feature!

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Alex Leith

@alexgleith

4 years

Around 30 TB of RAM and 6,000 CPUs were used to process 400 TB of data into a cloud-free mosaic over Africa. Thanks to @whatnick and his team, it's pretty easy to do this stuff! We'll be running this for four years of Sentinel-2 data soon in a 'real' run.

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Alex Leith

@alexgleith

2 years

@amazingmap @TerribleMaps All of US COLONIAL history. There's been people there for quite a few orbits of Pluto, actually!

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Alex Leith

@alexgleith

9 months

Here's the notebook and code, so you don't need to write it out yourself 😁

Simplest example for finding and loading Sentinel-2 data using Python

Simplest example for finding and loading Sentinel-2 data using Python - SimpleLoadS2.ipynb

gist.github.com

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Alex Leith

@alexgleith

3 years

I've been working on @OpenDataCube and @STACspec integration for a while, including getting some key things into the STAC spec and now that work is paying off! We can index data from @Microsoft 's Planetary Computer into the ODC with a one-line command now 🪄 More info soon...

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Alex Leith

@alexgleith

3 years

We're getting good at this. Processing every Landsat 8 scene ever captured over Africa to build cloud free annual mosaics took two hours on a hundred spot instances.

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Alex Leith

@alexgleith

3 years

Finished the @LEGO_Group world map! I didn't create a jupyter notebook and create an accurate map of some ocean parameter, but I did have a lot of fun with my daughters and girlfriend. I was really tempted to just remove NZ to mess with my mappy friends! But left it in instead ❤️

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Alex Leith

@alexgleith

3 years

Looking at @USGSLandsat 9, and I thought I'd compare with 8. Check this out! The Landsat 9 scene is the chunk on the right, and is a square. It's overlaid on the Landsat 8 scenes. It's nearly seamless! Pretty cool 😁

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Alex Leith

@alexgleith

6 years

I can now run a query using Dask on @OpenDataCube across all the pixels on Digital Earth Australia's Landsat 8 GeoMedian and calculate the average colour of all of Australia. It's light orange (I think!). 18.8 billion pixels averaged in 2 minutes over 10 servers.

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Alex Leith

@alexgleith

4 years

@AnaLeticiaGIS "What coordinate system is it" "Lat Lon" ...

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Alex Leith

@alexgleith

2 years

So many youth mappers globally! It must have a huge impact on OSM, as well as the students of course 🙂 #foss4g2022

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Alex Leith

@alexgleith

4 years

We're hiring three data engineers to come work on shiny Earth observation tech in a lovely, diverse crew of scientists, software developers and remote sensing professionals. It'll be a hoot!

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Alex Leith

@alexgleith

3 years

Pretty sure I have indexing all the 10 m global ESRI Land Cover product working in @OpenDataCube . It's an awesome example of open, interoperable data! We can compare our Australian land cover product with it in notebooks next week :-)

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Alex Leith

@alexgleith

3 years

Hey folks, us @OpenDataCube folks are running a conference and for the first time, we're broadcasting to you! We have one session streaming during Australian day time and one during US/Africa day time, so a timezone for everyone! Come join us 😀

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Alex Leith

@alexgleith

3 years

Casually consuming 4 TB of RAM and 2,000 CPUs...

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Alex Leith

@alexgleith

8 months

You can tell from this image that the imagery here was captured in 2017 and this region is experiencing some pretty serious recession. Around 25 m a year! Coming to the end of this coastal modelling exercise... hopefully can talk about it more soon.

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Alex Leith

@alexgleith

3 years

If you overlay a 40 year summary of surface water on a 40 year mean (for March) NDVI, the result you get is quite pretty. The @DEarthAfrica platform is really hitting its stride. Over 3 PB of data is available, including some fantastic deep time analyses.

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Alex Leith

@alexgleith

7 months

Nearly 40 years of evolution of a little sand bar

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Alex Leith

@alexgleith

3 years

Playing around with different land cover products over Africa. We have @DEarthAfrica 's Cropland probability, @ImpactObserv 's and then @ESA_EO 's. (Sorry I don't have the categorical legends working in Jupyter!) This is over Cairo.

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Alex Leith

@alexgleith

2 years

It’s going to be hot in Italy for @foss4g so I need a hat. But I don’t want to stand out too much. This will be about right, won’t it?

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Alex Leith

@alexgleith

4 years

I'm presenting later today as part of the Cloud Native Geospatial Outreach day. I'm hosting @sarasomewhere 's session first, at 5 pm, and then talking about @DEarthAfrica at 5.30 pm, AEST, including far too many live demos! Find out details here:

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Alex Leith

@alexgleith

4 years

There's a position open on my team, where you get to have fun wrangling petabytes of open data, whilst working on open source software and having a hilarious time with the lovely folks in #DigitalEarthAU Check it out:

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Alex Leith

@alexgleith

3 years

Holy crap, LiDAR scanning with the iPhone is actually amazing! Took me 10 seconds to do this little scan, with 33 k vertices produced!

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Alex Leith

@alexgleith

4 years

@mdsumner @DuncanBSS You know the weirdest useful shortcut on Mac OS? <command> + <ctrl> + <shift> + v is "paste without formatting". I have know idea how I found that, but it's super useful!

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Alex Leith

@alexgleith

6 years

Learning how to use sat-search with @developmentseed and it's pretty cool. This is a calendar view of satellite data available in public APIs on the command line! #FOSS4G2018

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Alex Leith

@alexgleith

8 months

I was interviewed for the @MapScaping podcast. We talked about cloud native geospatial, but from first principles (or thereabouts). I'd love to hear from less technical folks about whether this conversation helps demystify what cloud native means!

Introduction To Cloud Native Geospatial - October 11, 2024

Alex Leith is a Digital Earth Architect and in this episode, you will learn what Infrastructure as cloud is - hint it is the opposite of the "clicky-clicky" and so much more! Connect with Alex here...

mapscaping.com

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Alex Leith

@alexgleith

6 years

So, once again, @postgis blows my mind. Something that takes a long time in GeoPandas takes seconds in PostGIS. Joining 1.5 million points to 50,000 polygons? Seconds. Neighbor analysis? Seconds... Ridiculous!

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Alex Leith

@alexgleith

1 year

@GergelyOrosz Sounds pretty authoritarian... Rather than learning from mistakes, just fire the one person who knows the most about what happened and why.

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Alex Leith

@alexgleith

3 years

The @USGSLandsat 's new Landsat 9 data, which was released yesterday, is now available over all of Africa in @DEarthAfrica . Data from just a few days ago is available, for example, this scene over South Africa from the 8th of Feb 2022.

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Alex Leith

@alexgleith

1 year

It's official 💍

Cloud Optimized GeoTIFF (COG) published as official OGC Standard - Open Geospatial Consortium

COG allows for the efficient streaming and partial downloading of web-based imagery and grid coverage data for fast visualization and processing.

www.ogc.org

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Alex Leith

@alexgleith

3 years

Did you know that @DEarthAfrica has 2.9 PB of freely available Earth observation data covering all of Africa? You can discover it here: And we have a STAC API here: Or an interactive map here:

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Alex Leith

@alexgleith

3 years

A year of rainfall over Africa in super speed. Will try to get 30 years animated by the end of the day!

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Alex Leith

@alexgleith

3 years

Want to get paid to play with remote sensing data for 12 months? Pretty awesome opportunity from @Microsoft and @GEOSEC2025

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Alex Leith

@alexgleith

3 years

The @OpenDataCube is now an @OSGeo Community Project 🎉 It's been great to work on this project the last few years and recognition of the project by OSGeo is a fantastic milestone for us. Onwards to full Project status!

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Alex Leith

@alexgleith

4 years

There's a new release of the @OpenDataCube ! Meet version 1.8! It does a heap of nice stuff. We're also on the road to becoming an @OSGeo project. Check it out here:

Release 1.8.0 · opendatacube/datacube-core

Summary Lot's of changes since the 1.7 release. The two primary changes that are most likely to have backward compatibility issues are: The internal details of how we store geo-registration in...

github.com

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Alex Leith

@alexgleith

9 months

@0xhellz There’s Sentinel-2 data being captured constantly. With the two satellites, Sentinel-2A and B, every part of the Earth’s land surface is captured every 5 days with a resolution of 10 m.

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Alex Leith

@alexgleith

7 months

SAR. So pretty and so weird.

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Alex Leith

@alexgleith

3 years

Just under 300 modest sized spot instances starting up. They'll be running for around 10 hours processing a million Landsat scenes over Africa!

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Alex Leith

@alexgleith

5 years

So much happening next week for #geoweek19 . We've been doing a bunch of work preparing data and visualisations for @DEarthAfrica , so make sure if you come and hear about it on Tuesday! And you can view some of our work right now in the DE Africa Map:

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Alex Leith

@alexgleith

6 years

I didn't know you could even further optimise spatial indices in PostGIS by clustering! An order of magnitude performance increase in this example.

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Alex Leith

@alexgleith

5 years

WebGL is like chopping a bunch of carrots at once. It’s fast as fuck, according to @RealIvanSanchez 🥕 🔪 #foss4g2019

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Alex Leith

@alexgleith

5 years

I spoke to a family member today and their family business, a cafe of 20+ years, has had to let go 20 loved staff members because there is simply no way to pay them any more. Just wanted to share, because being able to work from home with kids is an extraordinary luxury.

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Alex Leith

@alexgleith

9 months

@adedoyinsammyd The @Microsoft Planetary Computer has a lot of data on it

Microsoft Planetary Computer

Supporting sustainability decision-making with the power of the cloud

planetarycomputer.microsoft.com

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Alex Leith

@alexgleith

1 year

I received my last pay check from the University of Tasmania today, and it’s pretty humbling, as I don’t have a next thing lined up. But I’m grateful for my experience working there and excited about what lies in the future.

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Alex Leith

@alexgleith

3 years

It's a palindrome date today* 22022022 * For the countries with sensible date formats 😂

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Alex Leith

@alexgleith

3 years

Ok, twenty years of daily rainfall data over Africa animated using the @OpenDataCube on @DEarthAfrica ! You can explore the data too using our Sandbox, or discover it on our STAC API 😁

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Alex Leith

@alexgleith

5 years

It’s my last day at @_FrontierSI_ today and I’m really looking forward to doing even more with the @OpenDataCube at @GeoscienceAus starting from next week! Hoping the gif is right 😉

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Alex Leith

@alexgleith

5 years

Twenty people now empowered to use the @OpenDataCube here at @FOSS4G_Oceania . We’ve used the @GeoscienceAus DEA Sandbox and the training materials prepared in collaboration with @_FrontierSI_ . Big thanks to @caitliniadams and Chris Morgan for their support!

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Alex Leith

@alexgleith

2 years

The tour of the Historical Museum of Italian Cartography was amazing! Thanks to the #FOSS4G2022 folks for organising it.

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Alex Leith

@alexgleith

4 years

Hey folks, find out what we do in #digitalearthaustralia at our public showcase! Complaints about data access? Come. Want to know what data is available? Come. Want to see someone like @SatelliteSci or @Claire_Science talk about amazing science? Also come!

DEA Quarterly Showcase

The DEA Quarterly Showcase is an opportunity for attendees to engage with the DEA program.

www.eventbrite.com.au

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Alex Leith

@alexgleith

11 months

This one has a bit more detail in it! Just pushed a 88 GB, 2 m resolution DEM of Tasmania up to @source_coop so it's a bit more easy to access than it used to be. Direct access is available via

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Alex Leith

@alexgleith

2 years

It's nice to get some positive feedback. I don't need a beer, a nice message is reward enough!

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Alex Leith

@alexgleith

7 months

We're doing a thing in November! You now have no excuse not to come visit us in Hobart 🌏

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Alex Leith

@alexgleith

6 years

Channeling @StevenFeldman and maps in the wild, this hillshade technique is rather good!

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Alex Leith

@alexgleith

10 months

Oh of course @kylebarron2 's name is on the Geopolars library! Will need to find some time to explore it...

GitHub - geopolars/geopolars: Geospatial extensions for Polars

Geospatial extensions for Polars. Contribute to geopolars/geopolars development by creating an account on GitHub.

github.com

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Alex Leith

@alexgleith

4 years

An 8 bit model of the flooding in Sydney yesterday. Magically produced by one of our data pipelines from near-real time Sentinel-2 data. Thanks to @IndecisiveMatt for being decisive and making this work!

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Alex Leith

@alexgleith

6 years

The @FOSS4G_Oceania committee representing at the @foss4g gala dinner! Good times, @adamdsteer ! #FOSS4G2018

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Alex Leith

@alexgleith

1 year

Worked out how to stream the @NASA and @USGSLandsat HLS data straight out of Earthdata and it works really well! Below is a three-month cloud free mosaic of Precipitous Bluff in Tasmania. Notebook is here:

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Alex Leith

@alexgleith

2 years

@TISM1982 @ozjimbob Can we please send @TISM1982 to the next Eurovision?

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Alex Leith

@alexgleith

2 years

@MaxLenormand @OpenDataCube You can point at a STAC API from Microsoft's Planetary Computer, @DEarthAfrica , @Element84 's Sentinel-2 COGs or the ENTIRE LANDSAT ARCHIVE from @USGSLandsat and load data into an xarray in minutes (with only a small amount of fussing around metadata).

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Alex Leith

@alexgleith

3 years

Where are you @Esri ? Maybe have quiet word, @esriaustralia ?

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Alex Leith

@alexgleith

2 years

Standing room only for @GeoSkeptic talk on Cloud Native Geospatial. What is CNG? It’s Google Earth Engine, Matt says… what does he mean?!

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Alex Leith

@alexgleith

3 years

@mouthofmorrison Have I told you about the new spatial planning company I’m starting? Urbananalytics. Emphasis on banana.

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Alex Leith

@alexgleith

3 years

The @OpenDataCube 's Cube in a Box has now got automatic indexing of the @esriaustralia Land Cover dataset, so you can work with global Sentinel-2 and Land Cover data in minutes on your local machine or an EC2 instance:

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Alex Leith

@alexgleith

1 year

Our @FOSS4G_Oceania conference registration desk is open at the Auckland University of Technology! So much happening this week, and a great vibe among workshop participants today! #foss4g23

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Alex Leith

@alexgleith

3 years

Drunken wisdom from Reddit. Priceless! "Good code is code that can be understood by a junior engineer. Great code can be understood by a first year CS freshman. The best code is no code at all."

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Alex Leith

@alexgleith

6 years

Finally got a nice 3D example going in QGIS 3. This is Mt Wellington in the new Tasmanian 10 m DEM. #augistribe

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Alex Leith

@alexgleith

5 years

Just consuming 2.7 TB of memory and 1,500+ CPUs crunching data. There's a point at which AWS, Kubernetes and all the other little pieces of learning curve become worth it! Should be done by Monday 😄

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Alex Leith

@alexgleith

3 years

There's a nice job leading a team of fancy cloud Earth observation folks available at Digital Earth Australia

Manager, Digital Earth Australia Technologies - Vacancy Details

candidate.aurion.cloud

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Alex Leith

@alexgleith

2 years

Teaching kids to make maps! Great presentation from @shemapsau about getting kids into spatial!

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Alex Leith

@alexgleith

3 years

EO is Easy 😆 Day two presentations from the @OpenDataCube conferences are online.

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Alex Leith

@alexgleith

3 years

ESRI's Land Cover global, 10 m resolution product rendered from COGs through the @opendatacube OWS engine and visualised in QGIS. Pretty cool!

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Alex Leith

@alexgleith

2 years

Software is nice, but @_VincentS_ ’s hand crafted, artisanal slides are wonderful! #FOSS4G2022

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Alex Leith

@alexgleith

5 years

Just received a freshly baked batch of organic @geohipster stickers ready for @foss4g next week. Come find me before they all disappear!

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Alex Leith

@alexgleith

6 years

In case you're not aware, we're running the Free and Open Source Software for Geospatial and State of the Map conference later this year. And you can now get involved by sponsoring the event. Check out our sponsorship prospectus here: @FOSS4G_Oceania

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Alex Leith

@alexgleith

2 years

Hey @pinakographos i finally framed the picture you made for me and it looks great on the wall of my office. Thankyou!

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Alex Leith

@alexgleith

4 years

Who wants a permanent position working on #earthobservation data as part of Digital Earth Australia? #augistribe #foss4g

Assistant Director, Analysis Ready Data Workflows - Vacancy Details

candidate.aurion.cloud

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Alex Leith

@alexgleith

2 years

Fucking fantastic! This is now the primary reason I regret not being able to be at the event. You know when the organisers can assemble a panel like this, they’re real forward thinkers and are building towards the future we want.

𝙼𝚊𝚝𝚝𝚑𝚎𝚠 𝙷𝚊𝚗𝚜𝚘𝚗

@GeoSkeptic

2 years

Really awesome to see an all-woman panel on satellite data providers in what tends to be a male-dominated field. Nice job @sat_summit ! #satsummit

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Alex Leith

@alexgleith

4 years

Hey folks, I've put some documentation down about how you can access #digitalearthau data directly from AWS' S3. Also included are notes on SNS notifications for new data. I'd love feedback from anyone this is useful for, or what's missing! #eochat

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Alex Leith

@alexgleith

3 years

Waves in the desert, somewhere in the west of the Great Sandy Desert from #digitalearthAU 's unreleased 2019 Landsat Collection 3 Geomedian.

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Alex Leith

@alexgleith

1 year

Radar data doesn't make any sense.

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Alex Leith

@alexgleith

5 years

A clear example of the benefits of analysis ready data. Left is a water index run on the @awscloud Landsat PDS level 1 data, and on the right the same index run on @USGSLandsat level 2 data. Thanks to Caitlin on our team at @_FrontierSI_ for creating this using the @opendatacube .

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Alex Leith

@alexgleith

5 years

We have a role open for a Geospatial Data Engineer. Come work with our team of fancy folks and help us wrangle data for Australia and Africa! Check it out here and please ask me questions:

Geospatial Data Engineer - Vacancy Details

candidate.aurion.cloud

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Alex Leith

@alexgleith

5 years

Really looking forward to sharing the work of @GeoscienceAus and @_FrontierSI_ in bringing together the data from #DigitalEarthAustralia and the tech from @OpenDataCube into a simple @ProjectJupyter environment so that folks can explore Earth observation data with ease!

FOSS4G SotM Oceania 2024

@FOSS4G_Oceania

5 years

Workshop spotlight: Do you want to understand how to access and enable analysis of over 30 years of earth observation data? Get in quick and join @alexgleith for his workshop on using Digital Earth Australia’s Open Data Cube:

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Alex Leith

@alexgleith

6 years

Around 18 months ago we embarked on rebuilding an urban planning application using @Mapbox and we weren't sure it would work, but it did, and it's super pretty! (Built with @vuejs , @turfjs , MapBoxGL etc.)

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Alex Leith

@alexgleith

6 years

It's great to see @Esri_Geospatial and @SafeSoftware battling for first place in the GDAL Barn Raising! but where are @PitneyBowes , @googlemaps and @Microsoft and the other big guys who use this open source infrastructure?!

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Alex Leith

@alexgleith

1 year

I'm excited to be working with a great team both in @spc_cps and @D4DInsights to deliver something meaningful for people in the Pacific. It's an exciting program with new challenges and some looming deadlines, all of which will be fun to tackle!

Aditya Agrawal

@AdityaD4D

1 year

I'm thrilled to welcome @alexgleith to @D4DInsights to support the establishment and launch of the @DEarthPacific program at @spc_cps . His previous experience with Digital Earth will be a huge asset for the Pacific.

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Alex Leith

@alexgleith

5 years

Great presentation from @Steven_Ramage on the work of GEO taking Earth observation from data to decisions. It’s really good to hear about their support for the @OpenDataCube and @DEarthAfrica along with @GeoscienceAus . I have a talk on the ODC on Friday if you want to know more!

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Alex Leith

@alexgleith

3 years

Nikita from @DEarthAfrica has produced a cloud free mosaic over all of Landsat 5 and 7 over Africa. This image is from 1984, over Cairo viewing three measures of variance. This was made possible by a lot of hard work from @Kirill_kzb as well as a bunch of hardcore science folks!

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Alex Leith

@alexgleith

2 years

One of the things we do at @osgeo_oceania is support the Oceania open geospatial community through our grants program. This picture attached is from a Women in Mapping event in Kiribati, which we are stoked to be able to support! Find out more here:

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Alex Leith

@alexgleith

2 years

All @OSGeo charter members are now associate members of @opengeospatial under the newly signed MOU. This is great! #FOSS4G2022

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Alex Leith

@alexgleith

3 years

Hey web mapping Twitter, does someone know how to make all the tiles in a Leaflet or MapboxGL animated PNG map sync up? Currently it's just random and silly! Map: Code:

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Alex Leith

@alexgleith

4 years

We've spent $6,000 USD on SPOT EC2 instances doing some work for @DEarthAfrica that we will talk about soon. That may not sound like a lot, but it's a huge amount of computation! Fun times 😆

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Alex Leith

@alexgleith

7 years

You can now download version 1 of the QGIS ICSM Transformer plugin and run precise transformations between Australian datums using official transformation grids. Get in there and test it! @qgisau @ICSM_gov_au #augistribe

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Alex Leith

@alexgleith

2 years

@Spatial_Punk Honestly, it's more like this: Esri QGIS, Geoserver and PostGIS . . . . . . . . . . . . . . . . . . . . . Pitney Bowes SuperMap GE Bentley System Hexagon Zondy Crber GeoStar

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Alex Leith

@alexgleith

4 years

We have a job going in #digitalearthau . This role leads the cloud team in building platforms that make large volumes of Earth observation data more easily accessible. More importantly, we're a diverse team of people working on #opensource and #opendata !

Assistant Director, Digital Earth Australia Technologies - Vacancy Details

candidate.aurion.cloud

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Alex Leith

@alexgleith

5 years

I had a great time hosting the panel on Community Building at @FOSS4G_Oceania . Thanks to the panelists, @lyzidiamond , @MammothMapping , @BartDeLathouwer and @Anne_Harper for their insights. And thanks to the audience for their questions. #foss4g_SotM_Oceania

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