Tootfinder

I built GeoOpen as an open, historical IP geolocation database. I didn’t expect it to attract so many different users so fast.
Tenzir’s latest blog shows how they use it: "Time-Travel for Investigators: Live & Retro GeoIP/ASN Enrichment".
🔗 Tenzir blog post https://tenzir.com/blog/live-and-retro

Time-Travel for Investigators: Live & Retro GeoIP/ASN Enrichment - Tenzir
The data pipeline engine for security teams. Collect, shape, optimize, enrich, store, replay, and route your security data. As a data pipeline management (DPM) solution, Tenzir automates security data across its entire lifecycle.

This guy made a Synthetic Aperture Radar (i.e. a radar that gives you camera-like pictures) mounted on a drone. Scroll to the bottom for actual sample pictures and a movie. Lots of tech detail and open-source designs and software.
https://hforsten.com/synthetic-apertur

Another thing I've learned debugging WiFi issues: having router sitting on the floor is a bad idea. How bad can it be? 10dBm bad.
Raising the router off the floor by just 30cm significantly improved network coverage, including on the floor below it!

Unlocking Stopped-Rotor Flight: Development and Validation of SPERO, a Novel UAV Platform
Kristan Hilby, Ian Hunter
https://arxiv.org/abs/2509.07812 https://

Unlocking Stopped-Rotor Flight: Development and Validation of SPERO, a Novel UAV Platform
Stop-rotor aircraft have long been proposed as the ideal vertical takeoff and landing (VTOL) aircraft for missions with equal time spent in both flight regimes, such as agricultural monitoring, search and rescue, and last-mile delivery. Featuring a central lifting surface that rotates in VTOL to generate vertical thrust and locks in forward flight to generate passive lift, the stop-rotor offers the potential for high efficiency across both modes. However, practical implementation has remained i…

RTR: A Transformer-Based Lossless Crossover with Perfect Phase Alignment
Xiangying Li, Jiankuan Li, Yong Tang
https://arxiv.org/abs/2509.08272 https://arxi…

RTR: A Transformer-Based Lossless Crossover with Perfect Phase Alignment
This paper proposes a transformer-based lossless crossover method, termed Resonant Transformer Router (RTR), which achieves frequency separation while ensuring perfect phase alignment between low-frequency (LF) and high-frequency (HF) channels at the crossover frequency. The core property of RTR is that its frequency responses satisfy a linear complementary relation HLF(f)+HHF(f)=1. so that the original signal can be perfectly reconstructed by linear summation of the two channels. Theoretical d…

Post from a friend about his bike getting stolen:
"My bike was in the very back corner of our garage, they passed my wife's bike, and they left our cars and other garage items alone.
They left a Schwinn mountain bike leaned against the garage.
I'm not upset to lose a rather uncomfortable old bike I paid $300 off of Craigslist 14 years ago. I won't be able to take the kids on a bike ride until I fix this.
I'd rather help whoever this is get the ri…

Improving Greenland Bed Topography Mapping with Uncertainty-Aware Graph Learning on Sparse Radar Data
Bayu Adhi Tama, Homayra Alam, Mostafa Cham, Omar Faruque, Jianwu Wang, Vandana Janeja
https://arxiv.org/abs/2509.08571

Improving Greenland Bed Topography Mapping with Uncertainty-Aware Graph Learning on Sparse Radar Data
Accurate maps of Greenland's subglacial bed are essential for sea-level projections, but radar observations are sparse and uneven. We introduce GraphTopoNet, a graph-learning framework that fuses heterogeneous supervision and explicitly models uncertainty via Monte Carlo dropout. Spatial graphs built from surface observables (elevation, velocity, mass balance) are augmented with gradient features and polynomial trends to capture both local variability and broad structure. To handle data gaps, w…

The results are in.
84 programmers responded to my C# preffered IDEs survey.
41.16 Chose Visual Studio.
39.96 Chose Rider.
15.12 Chose Visual Studio Code.
5.88 Chose Other.
It's interesting to see how Rider has caught up with Visual Studio in number of users over the years.
https://

Robust Radar SLAM for Vehicle Parking Applications
Luis Diener, Jens Kalkkuhl, Markus Enzweiler
https://arxiv.org/abs/2509.07683 https://arxiv.org/pdf/2509…

Robust Radar SLAM for Vehicle Parking Applications
We address ego-motion estimation for automated parking, where centimeter-level accuracy is crucial due to tight spaces and nearby obstacles. Traditional methods using inertial-measurement units and wheel encoders require calibration, making them costly and time-consuming. To overcome this, we propose a radar-based simultaneous localization and mapping (SLAM) approach that leverages the robustness of radar to adverse weather and support for online calibration. Our robocentric formulation fuses f…

WiFi and #Thread/ #Zigbee networks use overlapping ~2.4Ghz frequencies, and interfere with each other.
I've learned it the hard way. My old gadgets kept losing WiFi connection, so I bought the biggest baddest WiFi router. It made everything way worse!
The router kept picking an "u…