Miscellaneous Code

Curriculum Vitae


Senior GIS developer and system architect with extensive experience developing, deploying, and maintaining enterprise geospatial solutions.

  • Love solving complex problems involving concurrency, graph theory, indoor mapping, and spatial analysis
  • Professionally trained in both Scrum and Kanban
  • Seasoned Python developer with lots of experience (15+ years)
  • Expert-level knowledge of relational data modeling and SQL
  • Competent in JavaScript, Dojo, and ArcGIS Web AppBuilder
  • Experienced with other languages: C, C++, C# and Silverlight
  • Interested in working with: Rust, Julia, R, octave
  • Experienced in using cloud providers: Amazon, Azure, Heroku
  • Version control systems: Git, Mercurial, SVN, CVS
  • In-depth knowledge and proven enterprise experience with the entire ESRI ArcGIS stack: Desktop, SDE, Server, Portal, ArcObjects, arcpy
  • Also a heavy user of other enterprise GIS components: MapServer, GeoServer, TileStache, PostGIS, Spatialite, SQL Server spatial, Oracle spatial, Rtree, Fiona, Shapely, LAS Tools, PDAL, GDAL/OGR toolset, Mapnik toolset, and others
  • Operating systems: Windows, Linux, BSD, and others
  • Virtualization/container technologies: VMware, Citrix, VirtualBox, Vagrant, Chef, Docker


  • M.S. Geospatial Information Science, University of Texas at Dallas (2009)
    Thesis: "Optimal Route Selection Based on Analysis of Multiple Criteria Using PostGIS and pgRouting"

  • B.A. Geography, University of Texas at Dallas (2008)
    Specialty areas: geospatial analysis, GIS software development, database administration, network optimization

Training and Certificates

  • Building Applications Using the ArcGIS API for JavaScript (ver 10.2)
  • Object-Oriented JavaScript Essentials (Accelebrate)
  • Applied Imagery Quick Terrain Modeler
  • Agile training
  • Implementing ArcGIS Server Geoportal Extension
  • Job Tracking for ArcGIS (JTX)
  • Cartographic Design Using ArcGIS 9
  • Understanding Map Projections and Coordinate Systems
  • Creating and Integrating Data for Natural Resource Applications
  • Creating and Editing Geodatabase Features with ArcGIS Desktop
  • Creating, Editing, and Managing Geodatabases for ArcGIS Desktop
  • Working with Geodatabase Subtypes and Domains
  • Working with Map Topology in ArcGIS
  • Graduate Certificate in Geographic Information Systems from the University of Texas at Dallas

Career History

  • GIS Engineer (Apr 2015 - Present), RFspot Inc
    RFspot is a Series A startup that I have been contributing to since April of 2015. For them I have been architecting an enterprise geospatial system using ArcGIS Server on Linux in Amazon EC2, PosgreSQL/PostGIS on Amazon RDS, and other critical components in the Amazon Cloud infrastructure. I am the lead Python developer for a cloud-based data processing pipeline that produces meaningful analytics about retail environments from telemetry data. The system is designed to scale in real time by utilizing Celery and RabbitMQ as a distributed task queue for delegating tasks to worker nodes.

  • Senior GIS Database Engineer (Nov 2013 - Apr 2015), Vistronix Inc
    For a second contract with the same client within the USDA, I was once again responsible for providing highly scalable solutions for ArcGIS Server & SDE. Much of my time was spent developing new geoprocessing services written in Python and writing JavaScript based client applications leveraging the latest from the ArcGIS and Dojo JavaScript APIs. I also created some organization-specific tools for deploying ArcGIS services in network-isolated production environments.
    Reason for leaving: Opportunity to work in silicon valley for an indoor mapping and robotics company was very exciting and compensation was alluring enough for me to seize the opportunity.

  • System Consultant (Mar 2011 - Nov 2013), Geodata AS
    Geodata AS is a Norwegian IT company and official ESRI software distributor. I was a lead developer for Python and Microsoft C# / Silverlight mapping products developed for forestry, oil & gas, and utility companies. I collaborated with teams of various skills and cultural backgrounds to develop successful products.
    Reason for leaving: A very good opportunity arose with my previous client (USDA) that warranted my return.

  • ArcGIS Server Administrator / Developer (Jun 2009 – Mar 2011), Paradigm Systems GIS Inc
    During this time period I was hired for my first contract with the USDA. I was responsible for administration, customization, and maintenance of multi-tier ArcGIS Server, Desktop, and SDE implementations. Essential duties included developing geospatial web services and ArcGIS Desktop solutions (.NET), ensuring system availability, and in-depth performance monitoring.
    Reason for leaving: Found an excellent opportunity to work for a company in Norway and I could not possibly turn it down.

  • Scientist II (Apr 2009 - Jun 2009), Dynamac Corporation
    Dynamac Corporation is a provides comprehensive environmental, safety & health services and robust scientific support capabilities for both private and public sector clients. For them I was a contractor and technical expert brought on temporarily for the completion of a series of cartographic products for Phase I and Phase II environmental site assessments.
    Reason for leaving: This was a 3-month contract that was fulfilled.

  • GIS Technician (Jul 2007 - Apr 2009), LopezGarcia Group / URS Corporation
    URS Corporation (formerly United Research Services) is an engineering, design, and construction firm and a U.S. federal government contractor. For URS I was tasked with responsibilities ranging from GIS software development to the fine-tuning of ArcMap output for professional cartographic display. Regular activities included direct client interaction, GPS fieldwork, statistical analysis, database modeling, and planning GIS projects.
    Reason for leaving: Department layoffs following URS acquisition of LopezGarcia Group.

  • Server (Sep 2001 - Jan 2007), Texas Roadhouse LLC
    For this company I was a dedicated part-time employee working in the food service industry while pursuing a formal education in geospatial sciences.
    Reason for leaving: Needed more time to dedicate to upper-level study.

Project History

rfspotlib, RFspot Inc
rfspotlib is a Python package that contains a library and utilities for working with RFSpot's data. The package is written in Python and primarliy handles the mapping components of telemetric data from a robotic sensor platform. It also houses the code used for scaling in Amazon EC2 and monitoring distributed tasks. It's comprehensively documented using Sphinx-style docstrings and restructured text documents.

HD Report, RFspot Inc
HD Report is a QA reporting system primarily written in Python using the Flask framework. It is a collection of software that works in concert to provide reports on the accuracy of retail shelf mapping and visual confirmation of an AI image processing system.

rfspot_processing, RFspot Inc
rfspot_processing is a Python package that provides tools for interfacing with a third party artifical intelligence image processing system. It's written in Python 3 and utilizes asyncio for single-threaded concurrent code using coroutines.

rfsgistack, RFspot Inc
rfsgisstack is a series of bootstrap scripts written in Python for bringing up a customized GIS stack in Amazon EC2. It was created in lieu of ESRI providing working Chef scripts configurations compatible with Amazon.

GeoObserver for Elevation, National Geospatial Center of Excellence (USDA/Vistronix Inc)
GeoObserver for Elevation is a full-stack modular web application and set of geoprocessing services written using the ArcGIS JavaScript API, Python, and ArcGIS Server. The project represents the evolution of an earlier project (GeoProcessor for Elevation) that allows users to generate and download custom elevation products on the fly. The front end is written in JavaScript and the Dojo framework, with modular dijits that are reusable in other applications. The back end is powered by a series of geoprocessing services written in Python and hosted by ArcGIS Server and SQL Server.

NRCS Geodata States Bulk Publishing, National Geospatial Center of Excellence (USDA/Vistronix Inc)
The NRCS Geodata States Bulk Publishing toolbox is a set of tools written in Python that enable the packaging and publishing of all services hosted by an ArcGIS Server instance. It's used for transferring and deploying services in disconnected, secure network environments.

Geodata States GP, National Geospatial Center of Excellence (USDA/Vistronix Inc)
Geodata States GP is an asynchronous geoprocessing service written in Python designed to provide "Clip and ship" functionality for the geodata states map services. Allows granular control over which datasets are available and provides an easy to use REST interface through ArcGIS Server.

GeoSkog, Geodata AS
GeoSkog is statistical software used for forest growth predictions and economic value estimations relevant to the forestry/silviculture industry in Norway. Lead developer role included software architecture & design, guiding junior developers, distributed version control system management, and hands-on refactoring/development. Project has received positive press in the Norwegian media and has been presented at international conferences., Geodata AS
"Lommekjent", roughly translated as "familiar pocket", is a large-scale project for allowing people to map-out recreational trips in Norway. The services allow for both preliminary planning of trips, and sharing completed trips in a social way. Highlights include being responsible for accumulating existing disparate datasets and building topologically-correct network graph structures and designing custom algorithms for measuring connectivity and exposing disconnected sub-graphs. Documented workflows/activities for automated data dumps from yearly updates.

Statskog Arronderingssalg, Geodata AS
Statskog is a state-owned enterprise with a history back to 1860. Principal activities are forestry and land-use management on behalf of the Norwegian government. The "Arronderingssalg" application aids in the sale, classification, and quality assurance of properties' spatial and tabular data. The application is Silverlight-based and tightly coupled with Microsoft SharePoint and ArcGIS technology. Responsibilities include the development of server-side business logic exposed through Python ArcGIS geoprosessing services, SharePoint integration using the Silverlight Client Object Model, and C# Silverlight development.

Geodata Online, Geodata AS
Geodata Online is a collection of cloud-based ArcGIS services made available to Geodata's clients. Assisted in architecture planning of an Amazon-based cloud solution for Geodata and GeoInsight, developed utilities for health monitoring and maintaining timely responses for geoprocessing services, and created scripts for billing service usage to customers.

Riksantikvaren Askeladden, Geodata AS
A major cultural heritage project for the country of Norway. Played a vital role by revitalizing country-wide data previously designated as "damaged" using low-level geometry operations and tabular relationships. Developed a series of server-side ArcGIS geoprocessing services vital to the Silverlight-based client application.

GIS Server Administration, National Cartography and Geospatial Center (USDA/Paradigm Systems GIS Inc)
Architected enterprise-wide geospatial systems following principles of systems development lifecycle (SDLC) standards. Configured and administered ArcGIS Server and SDE deployments on physical and virtual machines by applying regular system updates, patches, optimizations, and customizations. Wrote software to monitor availability and performance of ArcGIS Server services. Successfully deployed highly scalable GIS services on the Amazon EC2 Cloud infrastructure. Optimized map services by using tile caches, generalized vector data, and scale dependencies. Programmed custom .NET functionality for SQL Server 2008 and PostgreSQL, leveraging the latest tools in spatial database technologies. Processed complex, nationwide geospatial layers in spatial databases using set-based logic for increased speed with spatially-enabled SQL.

Geoprocessor For Elevation, National Cartography and Geospatial Center (USDA/Paradigm Systems GIS Inc)
Designed and built a complete GIS for offering geospatial mapping services and geoprocessing services to remote field offices. The web services can be accessed from a variety of clients via a REST interface provided by ArcGIS Server. Two client-side implementations were built, one in ArcMap and the other in Microsoft Silverlight for use in a web browser. In either environment, a user selects an area-of-interest, along with other parameters, to extract subset data from massive elevation datasets to produce derivative products (i.e. hillshade, slope, contours). The architecture allows for more efficient dissemination of data.

Elevation Initiative, National Cartography and Geospatial Center (USDA/Paradigm Systems GIS Inc)
Coded ArcGIS geoprocessing services for allowing on-the-fly access to high-resolution Digital Elevation Models (DEMs) and selectable derivative products, including custom contours, hillshades, slope rasters, and aspect rasters.

LiDAR Processing, National Cartography and Geospatial Center (USDA/Paradigm Systems GIS Inc)
Developed a system for effectively cataloging, indexing, projecting, and processing thousands LIDAR datasets from LAS point cloud format to Digital Elevation Models (DEMs) for consumption in any GIS application using a combination of open source tools and custom-coded software.

Conservation Delivery Streamlining Initiative (CDSI) Mobile Pilot, National Cartography and Geospatial Center (USDA/Paradigm Systems GIS Inc)
Architected and deployed an ArcGIS Mobile pilot project for collecting field data with handheld GPS devices. The solution allowed for both direct-connected synchronization of geospatial data over mobile networks and disconnected editing where network signals were unavailable.

GeoObserver for Easements, National Cartography and Geospatial Center (USDA/Paradigm Systems GIS Inc)
A nationwide web-based mapping application for monitoring government-owned property is currently in the process of being moved to a production environment. The project uses Microsoft's Silverlight platform in conjunction with the ESRI Silverlight API. The result is a fast, reliable, and secure interactive map that runs in a user's web browser. For this project I created scalable map services, assisted in creating a SQL Server 2008 backend with the new spatial types, and provided C# code for a WCF service to provide the spatial data to the Silverlight application. I developed code for a "swipe" tool commonly used in change detection between various years of aerial imagery. Example code was posted on the ESRI code library and has received very positive feedback from the geospatial community.

National Hydrography Dataset (NHD), National Cartography and Geospatial Center (USDA/Paradigm Systems GIS Inc)
Imported massive NHD spatial datasets from ESRI ArcSDE export files as Microsoft SQL Server 2008 native geometry types for additional spatial functionality. Integrated the .NET Common Language Runtime (CLR) and developed user-defined aggregates (UDAs) in C# for storing one-to-many relationships in a single column with a specified delimiter for a legacy processing system. Created Stored Procedures (SPs), including advanced procedures for finding "nearest neighbor" that utilized SQL Server 2008 spatial indexes for increased performance. Built triggers in SQL to automate attribution of tabular data based on spatial relationships, making the process transparent to individuals involved in data entry.

MapServerMonitor, National Cartography and Geospatial Center (USDA/Paradigm Systems GIS Inc)
Designed and programmed an application to monitor ESRI map services and source layers for administrative purposes. The application was written in the Python programming language as a cross-platform solution to common problems related to distributed network environments, where web services are hard to track. This piece of software provides control to a system administrator, allowing the administrator to automate the process of hunting down non-functioning ArcGIS services.

GPS Statistical Analysis Project, National Cartography and Geospatial Center (USDA/Paradigm Systems GIS Inc)
Gigabytes of proprietary, flat-file GPS point cloud data were parsed and processed into PostGIS, an extension to the PostgreSQL database that allows for the storage and manipulation of spatial data. Several custom spatial SQL functions were employed to process the data spatially, and the R statistical environment was incorporated to perform descriptive statistical analyses on the GPS data for the creation of a final report that assessed unit accuracy.

Historic Resources Survey, URS Corporation / LopezGarcia Group
Contributed to a cultural resources survey for the City of Fort Worth. The project included surveys of viable economic areas, or "urban villages", and creating GIS-layered documentation for use by the City's planning and zoning departments. Over 2,000 resources were surveyed. I was responsible for the extraction, consolidation, and organization of field-collected GPS data. I devised and implemented a method for interactively viewing photographs of historic resources in an ArcGIS desktop mapping environment. Prior to the final report submission I also contributed to the digitization of historic neighborhood boundaries used in cartographic display.

Ables Springs 12138kV Transmission Line, URS Corporation / LopezGarcia Group
This project included mapping existing and future environmental constraints; identifying alternative routes; and identifying and evaluating the impacts of the alternative and preferred routes. The study area contained habitable structures; potential areas of species diversity, including a native and restored prairie; prime farmland; geology; and potential cultural resources. These services were performed in accordance with 37.056(c)(4)(A)-(D) of the Texas Utilities Code, Commission Procedural Rule 22.52(a)(4), Commission Substantive Rule 25.101(b)(3)(B) and the Commission's policy of prudent avoidance. My primary role dealt with providing guidance with technical aspects regarding quantification of geographic features. For the final document I consolidated data from a distributed database into a single report.

The T Southwest to Northeast Rail Corridor EIS/PE, URS Corporation / LopezGarcia Group
Assisted in geographic information systems data collection and analysis for The T's Southwest to Northeast Rail Corridor EIS/PE for a proposed commuter rail line extending from southwest Fort Worth to Dallas/Fort Worth International Airport (DFW Airport). Existing conditions and environmental impacts, including land uses, air and water quality, floodplains, threatened and endangered species, wetlands, hazardous materials and environmental justice, were analyzed in GIS. Maps, figures and presentation boards were generated in GIS using the results of this analysis. A historic-age structure survey of more than 4,000 buildings using global positioning system (GPS) equipment in concert with GIS was required on this project. I created maps from templates and layouts; assisted in identifying the proposed rail alignment, project area, right-of-way, potential hazardous sites, soil classification and land use information.

DWU Eastside Water Treatment Plant (WTP) to Southwest Dallas Water Transmission Pipeline, URS Corporation / LopezGarcia Group
Participated in the preparation of several map products associated with the preliminary investigation of the recommended alignment corridor for a proposed water transmission pipeline. The pipeline is anticipated to consist of approximately 16 miles of 120-inch pipeline and 16 miles of 96-inch pipeline. This project scope included preparation of field maps for environmental impact and cultural resource studies and data analysis of demographics and land usage. All deliverables were completed in ArcGIS and incorporated into the DWU Digital Resource Library.

East End Corridor Metro, URS Corporation / LopezGarcia Group
Was responsible for data collection and analysis of park lands and community service facilities during the preparation of a Draft Environmental Impact Assessment (DEIA). The proposed project involved the construction of a fixed Guided Rapid Transit (GRT) corridor primarily within existing roadway rights-of-way and the METRO owned Westpark railroad right-of-way. I worked closely with the planning department to provide data needed for reports.