LiDAR & 3D GIS portfolio
Classified LiDAR, terrain diagnostics, marine survey design and an interactive Haiti terrain mesh, with each artifact's data type, provenance and limits stated.
- LiDAR
- 3D GIS
- terrain analysis
- survey design
- cartography
Public record · 33 entries
Public index
Research, datasets, software, and writing.
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01Project
02Project
Spatial Investment Lab
A national atlas of observed NMTC financing and a 3D Asheville scenario connecting investment incentives, additional employment, constrained allocation and access to jobs.
- spatial economics
- investment incentives
- 3D GIS
- regional development
- network analysis
03Project
St. Louis City & Property Lab
A 3D urban instrument connecting mapped buildings, official City property evidence and rental scenarios. Recorded parcel information and modeled financial assumptions remain separate.
- GIS
- 3D
- urban economics
- property
- scenario analysis
04Project
Hidden Rivers
Explore deep ocean currents, Amazon waters and reefs through an interactive globe, satellite spectra and scientific maps.
- oceanography
- geospatial analysis
- scientific visualization
- remote sensing
- Sentinel-2
05Project
Counting, Factually
An open, living book on causal inference and the logic of quantitative evidence, with a browser data lab and provenance-tracked teaching datasets.
- causal inference
- econometrics
- research design
- open education
- interactive learning
06Project
Oceanographic systems
3D bathymetry, geographic data, current-field visualization, and acoustic model integration for survey planning support.
- geospatial analysis
- oceanography
- scientific visualization
- acoustics
07Project
Yellowjacket
A browser audio workbench connecting transcript editing, signal analysis, and music production.
- audio
- signal processing
- browser tools
- creative software
08Project
The Econometric Argument
An open econometrics course connecting empirical questions, formal theory, reproducible experiments, and defensible decisions. Twelve compact chapters, three interactive investigations, and a teaching and workshop guide.
- econometrics
- quantitative-modeling
- teaching
- causal-inference
- interactive-book
09Project
Applied Statistics
An open, executable methods library connecting estimands, derivations, software parity, diagnostics, identification boundaries, and defensible communication.
- statistics
- econometrics
- open education
- reproducibility
10Project
American Policy Atlas
A teaching observatory for statistics built on every U.S. county. Scrollytelling modules walk from a single map to spatial autocorrelation, empirical-Bayes shrinkage, and a California redlining flagship, each with the live numbers and a grounded research-assistant panel.
- observatory
- statistics
- teaching
- census
- spatial
11Note
Rebuilding the research site
How Astro and Pagefind connect my research, datasets, and teaching sites.
- meta
- tooling
12Project
EffDist V2026
A planned global gridded effective-distance dataset using population grids and settlement layers. In progress with Dr. Elizaveta Gonchar; no completed public release is claimed.
- dataset
- geospatial
- trade
- networks
13Project
Pictures of Inference
A visual textbook and workbook on statistical and econometric inference by Ian Helfrich and Elizaveta Gonchar, currently in draft.
- book
- stats
- teaching
14Project
U.S. New Markets Tax Credit research repository
Public repository for the project-level New Markets Tax Credit panel, research pipeline, and Cesium viewer source supporting the rural-mobilization-gap paper.
- dataset
- viewer
- blended-finance
- nmtc
15Project
STATAverse
Stata practice and interactive econometrics in the browser, with checked beginner lessons, data investigations and portable do-files.
- stata
- code
- applied-econometrics
16Dataset
Counterfactuals teaching data lab
Open, provenance-tracked teaching datasets that readers can filter, plot, inspect, and download while learning where description ends and causal identification begins.
- causal inference
- teaching data
- econometrics
- open data
- interactive
17Dataset
EffDist V2026
Planned global gridded effective-distance dataset using population grids, settlement layers, and probability-weighted flow graphs in place of geographic great-circle distance. In progress; no completed public release is claimed.
- geospatial
- trade
- networks
- effective-distance
18Dataset
New Markets Tax Credit national financing atlas: 2001–2023 origination years
Reconciled public financing records for 8,439 projects and 21,202 transactions from the August 2026 CDFI release, with 2020 tract internal points, annual financing flows and explicit missing-location flags.
- NMTC
- investment
- GIS
- regional economics
- public finance
19Dataset
U.S. New Markets Tax Credit project-level panel (FY2001-FY2022)
Cleaned, geocoded, and CDE-linked project-level panel built from 19,907 QLICI transactions covering 8,024 U.S. New Markets Tax Credit projects with origination years 2001–2022. The data spine behind Helfrich (2026).
- nmtc
- blended-finance
- panel-data
20Research
AI and the Entry-Level Labor Market
Did early-career employment change differently after widespread generative-AI adoption in occupations with greater measured AI exposure?
- continuous-exposure event study
- triple difference
- Current Population Survey microdata
- labor
- artificial-intelligence
21Research
Effective distance: a satellite-calibrated bilateral trade-cost panel, 2000-2024
Can a time-varying measure of bilateral effective distance represent changes in population, economic activity, infrastructure, and transport corridors?
- least-cost paths
- three-way fixed-effects PPML
- satellite-calibrated panel construction
- trade
- gravity
22Research
Empirical observation equilibria: the Russian seaborne-crude corridor, 2021-2024
Can public shipping and port records identify the feedback between sanctions-evasion behavior and the observation system used to measure Russian seaborne crude?
- AIS track linkage
- port-arrival reconciliation
- structural parameter design
- sanctions
- russian-crude
23Research
Human or Machine? Out-of-Time Validation of Task-Level AI Exposure Ratings
Which task-level AI-exposure ratings continue to align with public measures of task use that appeared after the ratings were constructed?
- within-occupation models
- paired cluster bootstrap
- out-of-time validation
- labor
- artificial-intelligence
24Research
Occlusion and adaptation: a closed-loop spatial-labor model of Ukraine's wartime economic reorganization, 2022-2025
How has Ukraine's wartime economic activity reorganized across space when official measurement is itself disrupted by conflict, occupation, and displacement?
- spatial decomposition
- remote sensing
- administrative-data reconciliation
- ukraine
- wartime-economy
25Research
Penumbra: closed-loop observation under measurement gaps in cross-border trade
How should a trade model represent settings where the equilibrium changes the observation system used to measure that equilibrium?
- economic measurement
- observation feedback
- theory design
- sanctions
- satellite-economics
26Research
The rural mobilization gap in a U.S. place-based tax credit
Does the rural private-leverage gap persist when rural and urban projects are compared within the same Community Development Entity?
- Community Development Entity fixed effects
- order-invariant decomposition
- bunching test
- nmtc
- blended-finance
27Project
MacroResearchTools
Python toolkit for macroeconomic research with Numba-accelerated FRED pipelines and structural-VAR scaffolding. Built for the kind of empirical macro work where the data engineering eats the analyst's day.
- macro
- python
- numba
- FRED
28Project
ClimFinRisk
Models for the analysis of physical and financial risks linked to geospatial climate exposures. A toolkit for combining IPCC scenario gridded data with bank-balance-sheet and insurance-portfolio exposures.
- climate
- finance
- geospatial
- risk
29Project
TeachingNotes
The running back-of-the-notebook archive: working LaTeX, Quarto, and Python templates for the courses I teach and tutor through. Intermediate micro and macro, econometrics, finance, math-for-econ.
- teaching
- templates
- notes
30Note
Welcome to Plot & Policy
An edited version of the introduction to my former WordPress research blog.
- meta
- archive
31Research
Trade in the spotlight: enhancing gravity model predictions with nightlights and population-weighted distance measures
Does a gravity model fit better when bilateral distance reflects where population and measured economic activity are located within countries?
- gravity model
- VIIRS nightlights
- population-weighted geodesic distance
- trade
- gravity
32Research
A unifying framework for economic equilibrium and optimal transport in infinite-dimensional Hilbert spaces
Under what conditions can economic equilibrium be represented as an optimal-transport problem in an infinite-dimensional Hilbert space?
- optimal transport
- tensor-valued measures
- nonlinear operator theory
- optimal-transport
- equilibrium-theory
33Research
Redefining Trade Dynamics: Incorporating Network Centrality, Spatial Heterogeneity, and Optimal Transport Theory into Models of International Trade
How do network position, within-country spatial heterogeneity, and optimal transport change the representation of international trade?
- structural gravity
- network centrality
- optimal transport
- international-trade
- networks
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