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Eesterlein/README.md

Hi, I'm Elissa Esterlein

Data analyst and developer in Gunnison, Colorado. I work with property assessment data at the county level and build tools that make that data usable: interactive parcel maps, dashboards, a permit portal, and AI-assisted workflows for appraisal staff.

Focus: SQL and data quality · GIS and spatial data · full-stack web apps · practical AI tools

Featured projects

Project What it is Stack
Gunnison County Assessor Map · live Full-stack GIS platform: configurable layers, CSV/Excel joins to parcels, live wildfire detections React, TypeScript, MapLibre, PostGIS, Docker
Land Attributes Dashboard · live Parcel map and review tool for land attributes, with an automated data pipeline MapLibre, Python, GitHub Actions
Building Stock Dashboard · live Analysis of 18,000+ county building records JavaScript, SVG
Permit Portal Building-permit search and staff admin portal for four jurisdictions React, Node/Express, PostgreSQL, AWS
Appraiser Photo Processor Desktop app that classifies and renames field photos with GPS and Claude Vision Python, Claude API
Property Eye Satellite change detection to flag new construction (in development) FastAPI, Earth Engine, PostGIS
Property Tax Calculator · live Educational estimator showing how values and mill levies become a tax bill JavaScript
Who Owns Colorado? · live Public vs. private land ownership statewide, with a Gunnison County case study Python, GeoPandas

Tools

Data: SQL (SQL Server, PostgreSQL, Access) · Python · R · SAS · Excel · Tableau · Power BI GIS: PostGIS · GDAL · MapLibre GL JS · Leaflet · OGC APIs Web: JavaScript/TypeScript · React · Node.js · Docker · nginx · AWS AI: Claude API · OpenAI API · Ollama / local LLMs

Elsewhere

Tableau Public · Kaggle · Portfolio

County-related projects here are independent work built from publicly available data. They are not official products of the Gunnison County Assessor's Office or Gunnison County.

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  1. gunnison-county-property-tax-calculator gunnison-county-property-tax-calculator Public

    Educational, client-side property tax calculator for Gunnison County, Colorado. Uses publicly available data to demonstrate how assessed values and mill levies are used to estimate property taxes. …

    JavaScript

  2. gunnison-permit-portal gunnison-permit-portal Public

    Public building-permit search and staff admin portal for Gunnison County jurisdictions. React, Node/Express, PostgreSQL/Prisma, AWS.

    JavaScript

  3. assessor-map assessor-map Public

    Full-stack GIS platform for Gunnison County assessors: configurable map layers, CSV/Excel joins to parcels, live wildfire detections. React, TypeScript, MapLibre, PostGIS, Docker.

    TypeScript

  4. Appraiser-Photo-Processor Appraiser-Photo-Processor Public

    Desktop app for county assessors to automatically classify and rename property photos using GPS, compass direction, and Claude Vision AI

    Python

  5. gunnison-land-attributes-demo gunnison-land-attributes-demo Public

    Independent research dashboard: interactive map and review tool for land attributes on Gunnison County, CO parcels, built from public assessor data.

    JavaScript

  6. gunnison-property-eye gunnison-property-eye Public

    Satellite change detection for property assessment: flags parcels with new construction using Sentinel-2 NDBI via Google Earth Engine. FastAPI, PostGIS, React.

    Python