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Cristian Alejandro Usma Rojas

@cristianalejandrousm

Message

I build geospatial datasets, environmental models, and automated GIS tools using Python, drones, and spatial analysis.

Colombia

Message

I've produced high-resolution geospatial datasets and environmental models for engineering projects, using GIS, Python, drones, and DGNSS technology.

At GOTTA Engineering S.A.S., I delivered drone-based datasets across more than 5,000 hectares and 12 environmental projects, including orthomosaics, terrain models, point clouds, contour maps, and terrain derivatives.

I launched the company's drone-based geospatial services line and built Python tools that helped teammates streamline complex environmental-data workflows. I also implemented hydrological, sedimentological, water-quality, hydraulic, and flood models across multiple basins and studies.

More recently, I've contributed annotation, evaluation, review, and RLHF work for multimodal generative AI systems spanning text, image, audio, video, STEM, and engineering domains.

Experience

Work history, roles, and key accomplishments

Current

AI Contributor

Current

Self Employed

Sep 2024 - Present (2 years)

Performed annotation, evaluation, and review tasks and contributed to RLHF workflows for multimodal generative AI systems involving text, image, audio, and video models across both general-purpose and STEM/engineering-focused domains.

Multimodal AI Data Annotation RLHF

Project Engineer

GOTTA Engineering S.A.S.

Mar 2020 - Nov 2023 (3 years 8 months)

Produced high-resolution geospatial datasets using drone and DGNSS technology, covering more than 5,000 hectares across 12 environmental projects, including orthomosaics, digital surface and terrain models, point clouds, contour maps, and terrain derivatives. Developed and launched the company's drone-based geospatial services line, including regulatory compliance, cost structure development, and

GIS Drone DGNSS Photogrammetry LiDAR Python Geospatial Data Processing HEC RAS

Engineering Assistant

National University of Colombia at Medellín

Oct 2019 - Jan 2020 (3 months)

Developed and delivered an ArcMap plugin that standardized hydrosedimentological and water-quality analysis workflows for drinking-water supply basins, enabling the client to replicate the analysis across different basins.

GIS