Spatial Stack with Matt Forrest

About Spatial Stack with Matt Forrest

Welcome to The Spatial Stack, where modern geospatial technology takes center stage. Our episodes feature interviews with leading experts, insightful discussions on the integration of AI and big data in spatial tech, and case studies on groundbreaking projects worldwide. Tune in to stay ahead in the rapidly evolving world of geospatial technology!

Publisher

Matt Forrest

Category

business · technology

Language

en

Explicit

No

First episode

7 May 2024

Latest episode

8 Sept 2026

Latest episodes

15 of 55 episodes have a transcript.

1. 

   8 Sept 2026TRANSCRIPT

   Thinking Spatially for a Living: Chris Tucker on 175 Years of the American Geographical Society

   In this episode of the Spatial Stack, Matt sits down with Dr. Chris Tucker, chairman of the American Geographical Society, in the year the AGS turns 175. Chris makes the case that spatial thinking is foundational literacy, on the level of language or math, and that the 4.5 million people who have taken AP Human Geography are already practicing it every day in jobs that never mention geography. He shares how a single question from a CIA veteran, about why we cannot draw a bounding box on a map and pull in everything known about that place at that moment, set the direction for almost thirty years of his career. The conversation also covers what has changed about getting into this work. The advanced degree, the expensive workstation, and the expensive software used to be the price of entry. Free tools and YouTube replaced all three. Chris then takes on a challenge: name five careers that do not sound geographic but where spatial skills give you a real edge. Surveying, the CAD and built environment world, aviation, marine navigation, and conservation all make the list, along with a case for why geography works as both a horizontal and a vertical. We also get into the AGS itself, from the Fliers' and Explorers' Globe signed by Amelia Earhart, Sir Edmund Hillary, and Neil Armstrong, to the geographers at 156th and Broadway who worked on the inquiry behind the Treaty of Versailles. If you have ever struggled to explain what you actually do for a living, this conversation gives you better language for it. Connect with Chris Tucker and the AGS: LinkedIn: https://www.linkedin.com/in/christopher-tucker-5595689/ (https://www.linkedin.com/in/christopher-tucker-5595689/) American Geographical Society: https://www.americangeo.org (https://www.americangeo.org) Email: tucker@americangeo.org (mailto:tucker@americangeo.org) LEARN MORE AGS 175th anniversary campaign: https://www.americangeo.org (https://www.americangeo.org) The Fliers' and Explorers' Globe: https://www.americangeo.org/globe (https://www.americangeo.org/globe) Geography 2050 (Africa: Shaping the Future): https://www.geography2050.org (https://www.geography2050.org) Teen Maptivist: https://teenmaptivists.org (https://www.teenmaptivists.org/) CHAPTERS: 00:00:00 – Welcome and Chris Tucker's Background 00:01:21 – 4.5 Million AP Human Geography Students 00:04:48 – Spatial Thinking as Foundational Literacy 00:09:08 – 175 Years of the American Geographical Society 00:12:03 – The Fliers' and Explorers' Globe 00:15:05 – The AGS and the Treaty of Versailles 00:18:02 – The 175th Anniversary Campaign 00:21:49 – How Matt and Chris Found Geography 00:24:59 – Free Tools and Getting Back Into the Work 00:27:07 – Advocating for Geography in Schools 00:30:55 – Geography as Horizontal and Vertical 00:35:01 – Five Careers Where Spatial Gives You an Edge 00:40:34 – Getting Involved with AGS and Geography 2050 --- 📊 FREE: The Modern GIS Skill Map The 5 skills that actually matter in modern GIS (and what you can stop learning). Based on a survey of 1,400+ geospatial professionals. ➡ Get the free training + PDF guide: https://forrest.nyc/go/training/ (https://forrest.nyc/go/training/) 📰 Daily modern GIS insights: https://forrest.nyc (https://forrest.nyc) CONNECT WITH ME 📸 Instagram:  https://www.instagram.com/matt_forrest/ (https://www.instagram.com/matt_forrest/) 💼 LinkedIn: https://www.linkedin.com/in/mbforr/ (https://www.linkedin.com/in/mbforr/) 📧 Newsletter: https://forrest.nyc (https://forrest.nyc) 🌐 Website: https://forrest.nyc (https://forrest.nyc)

2. 

   26 Aug 2026TRANSCRIPT

   Mapping the Invisible: Soil Fungi, Satellites, and the Largest Network on Earth with Justin Stewart

   What does it take to map something you have never seen? In this episode, Matt Forrest sits down with Justin Stewart, quantitative ecologist at SPUN, the Society for the Protection of Underground Networks, to unpack how his team built the first global map of arbuscular mycorrhizal fungi, the soil organisms living in symbiosis with most plants on Earth. Justin walks through the full pipeline, from robotic microscopy of threads two and a half microns wide up to a planetary prediction at one square kilometer resolution. The team assembled 16,000 soil samples from more than 300 studies across 11 languages, trained a random forest on 34 satellite-derived layers in Google Earth Engine, and summed the result: roughly 110 quadrillion kilometers of fungal thread, about 300 megatons of carbon, six times the biomass of every human alive. The findings were not what anyone expected. The densest networks are under grasslands, not forests. Croplands run about 50 percent sparser. And 90 percent of the biodiversity hotspots for these fungi sit outside any protected area. In this episode, we cover: - Why mapping a symbiosis is harder than mapping an organism - Robotic imaging in the Amolf biophysics lab, and tracking half a million nodes at once - Building a global database from literature in 11 languages - Random forest niche modeling and uncertainty analysis in Google Earth Engine - The effective radius algorithm that turns network length into biomass - Why grasslands, flooded wetlands, and the Tibetan plateau light up on the map - Tilling, fertilizer, and how a 450 million year old symbiosis gets broken - Rights of nature, eDNA, and why predictive maps are not yet admissible evidence LINKS: Justin Stewart SPUN profile: https://www.spun.earth/team-members/justin-stewart (https://www.spun.earth/team-members/justin-stewart) LinkedIn: https://www.linkedin.com/in/justin-stewart-70512645/ (https://www.linkedin.com/in/justin-stewart-70512645/) Google Scholar: https://scholar.google.com/citations?hl=en&user=1aqTJIUAAAAJ (https://scholar.google.com/citations?hl=en&user=1aqTJIUAAAAJ) SPUN Website: https://www.spun.earth (https://www.spun.earth) Underground Atlas: https://a-hidden-infrastructure.spun.earth/story/a-hidden-infrastructure (https://a-hidden-infrastructure.spun.earth/story/a-hidden-infrastructure) LEARN MORE The paper: Science, June 11, 2026. DOI 10.1126/science.adu4373 Mycorrhizal Biodiversity Map: https://a-hidden-infrastructure.spun.earth/story/a-hidden-infrastructure (https://a-hidden-infrastructure.spun.earth/story/a-hidden-infrastructure) CHAPTERS: 00:00:00 – The largest living network on Earth 00:02:15 – Welcome and intro 00:03:38 – What the map shows: a partnership, not an organism 00:05:48 – Robots, petri dishes, and carbon moving at 400 kilometers an hour 00:07:47 – The question that started it: how much is out there? 00:09:25 – 110 quadrillion kilometers and six times human biomass 00:11:15 – What a quantitative ecologist actually does 00:13:53 – Trade, lipids, and 30 percent of a plant's nitrogen 00:16:31 – What people get wrong about soil 00:18:27 – The pipeline: 34 satellite layers, random forest, Earth Engine 00:21:02 – From length to weight: effective radius and the robot named Prince 00:25:41 – Croplands and a broken 450 million year symbiosis 00:31:40 – Rights of nature and getting predictions accepted as evidence 00:37:10 – Where to find SPUN and Justin 📊 FREE: The Modern GIS Skill Map The 5 skills that actually matter in modern GIS (and what you can stop learning). Based on a survey of 1,400+ geospatial professionals. ➡ Get the free training + PDF guide: https://forrest.nyc/go/training/ (https://forrest.nyc/go/training/) 📰 Daily modern GIS insights: https://forrest.nyc (https://forrest.nyc) CONNECT WITH ME 📸 Instagram: https://www.instagram.com/matt_forrest/ (https://www.instagram.com/matt_forrest/) 💼 LinkedIn: https://www.linkedin.com/in/mbforr/ (https://www.linkedin.com/in/mbforr/) 📧 Newsletter: https://forrest.nyc (https://forrest.nyc) 🌐 Website: https://forrest.nyc (https://forrest.nyc)

3. 

   16 Jul 2026

   Beyond the Blue Dot: AI & LLM Navigation with Zephr's Sean Gorman and Pramukta Rao

   What does it actually take for an AI to navigate you through the real world, without a screen and without a camera running the whole time? In this episode of the Spatial Stack, Matt Forrest sits down with Sean Gorman and Pramukta Rao, the co-founders of Zephr, to unpack how they ground large language models in location. Sean and Pramukta spent twenty years building startups together, from GeoIQ to Snap's visual positioning work, and at Zephr they walked away from the camera and went back to the sensors already in your phone. They get into why the blue dot on a map breaks down the moment you stop looking at a screen, why language models are bad at spatial reasoning like left, right, and across the street, and how they fix it by doing the geometry first and handing the model clean language. Instead of training ever-bigger foundation models, they push a small model and well-structured data down to the edge so the conversation stays fast. In this episode, we cover: - Why they left visual positioning and AR cameras behind after Snap - Cooperative positioning: getting survey-grade accuracy out of commodity phones - GNSS and the urban canyon problem (3 meters to 50 meters and back) - Beyond the blue dot: building a first-person, egocentric experience - Why LLMs struggle with geometry, and what context engineering solves - Small models at the edge vs giant foundation models - Overture Maps, GERS IDs, and conflating POIs with imagery to "agree on reality" - The grounding service: MCP, REST, and Opus or Gemma on device - Conversations about place as a new geospatial primitive Whether you build with spatial data, work on AI navigation, or just want to see where location and LLMs are heading, this conversation is your field guide. Connect with Zephr: Website: https://zephr.xyz (https://zephr.xyz) Sean Gorman (LinkedIn): https://www.linkedin.com/in/sean-gorman-93a79 (https://www.linkedin.com/in/sean-gorman-93a79) Pramukta Rao (LinkedIn): https://www.linkedin.com/in/pramukta/ (https://www.linkedin.com/in/pramukta/) Zephr (LinkedIn): https://www.linkedin.com/company/zephr-xyz (https://www.linkedin.com/company/zephr-xyz) 00:00:00 – Intro and twenty years of startups together 00:04:05 – Why they walked away from cameras and AR at Snap 00:04:54 – Commodity sensors and cooperative positioning 00:07:15 – GNSS 101 and the urban canyon problem 00:10:56 – Beyond the blue dot: an egocentric experience 00:13:37 – Why LLMs are bad at left, right, and across the street 00:18:19 – Context engineering and the retrieval problem 00:22:03 – Small models at the edge vs giant foundation models 00:30:09 – Collective memory: OpenStreetMap, Mapillary, Overture 00:32:08 – Conflating POIs with imagery to agree on reality 00:35:36 – The grounding service: MCP, REST, Opus or Gemma on device 00:38:37 – What's next: conversations as a new geospatial primitive 00:42:22 – Where to find Zephr 📊 FREE: The Modern GIS Skill Map The 5 skills that actually matter in modern GIS (and what you can stop learning). Based on a survey of 1,400+ geospatial professionals. ➡ Get the free training + PDF guide: https://forrest.nyc/go/training/ (https://forrest.nyc/go/training/) 🚀 Join The Spatial Lab: Stop guessing at your career path. Get direct mentorship, advanced training, and a roadmap to these high-value roles inside The Spatial Lab. 👉 https://forrest.nyc/spatial-lab/ (https://forrest.nyc/spatial-lab/) 📰 Daily modern GIS insights: https://forrest.nyc (https://forrest.nyc) CONNECT WITH ME 📸 Instagram:  https://www.instagram.com/matt_forrest/ (https://www.instagram.com/matt_forrest/) 💼 LinkedIn: https://www.linkedin.com/in/mbforr/ (https://www.linkedin.com/in/mbforr/) 📧 Newsletter: https://forrest.nyc (https://forrest.nyc) 🌐 Website: https://forrest.nyc (https://forrest.nyc)

Inside a recent episode

Thinking Spatially for a Living: Chris Tucker on 175 Years of the American Geographical Society

Published 8 Sept 2026 · Transcript excerpt

[…] Because we may not be having, you know, more and more geographers as classically thinking, but we have more people thinking in a spatial lens. Like, is that is that the right way to kind of think about this? And is that the goal to really get more people to embed that no matter what they're doing? Yeah, no, I do think so. You know, spatial thinking is very much kind of preternatural human trait, right? Going back hundreds of thousands of years, we had to navigate our way across a unknown and often uncertain landscape. And those are a lot of skills that are evolved into the human brain. But just like any other skill, you know, they are enhanced with usage and refinement, right? […]

Who has been a guest on Spatial Stack with Matt Forrest

Names identified in recent episode analyses. Showing up to five guests.

• Pierrick Poulenas
• Kyle Walker
• Ryan
• Phil
• Len

Reach and audience

Public platform figures. Ratings count people who left a rating, not total listeners.

Apple Podcasts (US)

4.2 / 5

5 ratings

Spotify

5.0 / 5

10 ratings

Podcast Authority Score: 28 / 100

A composite of feed quality, social presence, YouTube performance and engagement. Read the methodology.

Quality

44

Social presence

0

YouTube

0

Engagement

32

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