00 / Overview

Joshua Martin

Civil Engineer · Site Engineering & Construction · Remote Sensing & GIS

Civil engineering graduate from NIT Calicut with hands-on site experience and a final-year research project in satellite-based soil moisture mapping. Open to relocation.

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Site-supervised a building construction project
Mapped soil moisture from Sentinel-1 SAR imagery
Led a 200+ person infrastructure committee at NIT Calicut

Looking for

Graduate Civil Engineer Site Engineer Assistant Site Engineer Junior Civil Engineer

Joshua Martin in hard hat and hi-vis vest on a building site

EngineerJoshua Martin

DisciplineCivil Engineering

EducationBTech, NIT Calicut

AvailabilityOpen to relocation

200+

people led in the Ragam 2023 infrastructure committee

0.77 R²

R² of the soil-moisture model built from Sentinel-1 VV and VH backscatter

7

SAR preprocessing steps applied in SNAP

2

site internships in building construction and water infrastructure

01 / Project

Surface Soil Moisture Retrieval over Agricultural Plots
Using SAR and Machine Learning

2024 to 2025

Soil Moisture Index map of the Mandya study area derived from Landsat 8 imagery

Fig. 13, SMI map, Mandya region

Normalised Difference Vegetation Index map of the Mandya study area derived from Landsat 8 imagery

Fig. 12, NDVI map, Mandya region

SNAP Graph Builder SAR preprocessing workflow showing the complete processing chain for Sentinel-1 data

Fig. 03, SNAP Graph Builder workflow

Problem

Estimating surface soil moisture over agricultural plots for water-management applications.

Data

Sentinel-1 SAR imagery, Landsat 8 NDVI and Soil Moisture Index, and field-measured soil-moisture data.

Approach

SAR preprocessing in SNAP (7 stages from subset to dB conversion). Regression modelling to relate backscatter to field-measured soil moisture. See step viewer below.

Result

R² 0.77 MAE 1.83 RMSE 2.25

SSM = 3.09 × VV + 0.19 × VH + 52.25

SAR Preprocessing, Step Viewer

01 / 08 Subset

Crop the full scene to the study-area extent.

01 Subset, Crop the full scene to the study-area extent.

02 Thermal-noise removal, Remove sensor thermal noise from raw data.

03 Orbit correction, Apply precise orbital state vectors.

04 Calibration, Convert digital numbers to sigma-naught.

05 Multilooking, Reduce speckle and resample to square pixels.

06 Speckle filtering, Further reduce speckle noise spatially.

07 Terrain correction, Geocode and correct for topographic distortions.

08 Linear-to-dB, Convert sigma-naught to decibels.

SNAP Graph Builder, Processing Chain

Click a node to jump to that step in the viewer above.

Try the Model

VV backscatter

−9.8 dB

VH backscatter

−16.6 dB

SSM 18.8%

R² 0.77 · MAE 1.83 · RMSE 2.25

Illustrative: uses the equation from the project report, valid only within the range of the study data.

PROJECT DATA SHEET
Study area	Mandya region
Sensors	Sentinel-1, Landsat 8
Indices	NDVI, SMI
Duration	2024 to 2025

Core Stack //

Sentinel-1 Landsat 8 NDVI / SMI SNAP

02 / Leadership

Infrastructure Committee Lead, Ragam 2023

Joint Convenor of an infrastructure committee of 200+ people responsible for executing a 3-day cultural festival at NIT Calicut.

What the committee handled

Stage setup
Lighting
Stalls
Barricading
Power distribution
Site safety
Vendor coordination
On-ground scheduling

RoleJoint Convenor

Team200+

Event3-day festival

Year2023

Joshua Martin with the Ragam 2023 infrastructure committee

Fig. 02, Infrastructure team, Ragam 2023

Fig. 03, Festival team, Ragam 2023

03 / Experience

Experience

Site Supervisor Intern, Arch.idam

2025

Joshua Martin and team on a building construction site

Fig. 04

Measuring timber planks on a construction site

Fig. 05

Supported day-to-day site supervision on a building construction project.
Monitored ongoing site activities and helped coordinate work between site teams.
Followed construction sequencing from drawings through to execution on site.
Took part in measuring and assessing materials on site, including timber.
Observed site quality checks and safety practices.
Checked work on site against the drawings.
Kept daily notes and photographs of progress.
Followed material deliveries and storage on site.
Observed masonry, concrete and finishing activities.

Civil Engineering Intern, RBSC Construction Group

2026

Aeration and biological treatment tank at a water treatment plant

Fig. 06

Pump and valve installation at a water treatment plant

Fig. 07

Assisted with day-to-day site tasks and observed construction execution and coordination.
Observed the layout and operation of a treatment plant, including aeration tank, storage tank, pumps and valves.
Recorded site observations and photographs to support learning and reporting.
Learned how flow moves between treatment units and which equipment controls it.
Observed routine inspection and maintenance of pumps, valves and tanks.
Coordinated with site staff on daily tasks.

04 / Skills

Skills

Click a skill to see where it appears in the portfolio.

Site and construction
Remote sensing and GIS
Data and analysis
Leadership
Software

05 / Education

Education & Achievements

BTech, Civil Engineering. National Institute of Technology Calicut, 2021 to 2025.

Final-year project: Surface Soil Moisture Retrieval Using SAR and Machine Learning.

NIT Calicut

Languages

English, Hindi, Malayalam, Tamil

Achievements & Activities

Joint Convenor, Ragam 2023, NIT Calicut2023
Marketing Committee Executive, Ragam 20232023
Programme Committee Member, Tatva 20222022
Represented NIT Calicut at Inter-NIT Badminton2022
Captain, Kerala State ICSE Badminton Team2018
School Sports Captain and Football Team Captain
Member, NSS and Adventure Club, NIT Calicut

06 / Beyond Engineering

Beyond engineering

Joshua Martin playing competitive badminton, action photograph

Fig. 08, Badminton

Fig. 09, JBROS Café

Cooking and food, badminton, and managing people and projects. Represented NIT Calicut at Inter-NIT Badminton 2022 and captained the Kerala State ICSE Badminton Team in 2018.

Fig. 10, JBROS Café & Co., exterior

Entrepreneurial venture, 2026 to Present

Founder, JBROS Café & Co.

Founded and runs a small food-service business from concept to daily service.
Chose the spot and set up the outlet, thinking about access, footfall, parking and evening trade.
Planned the cooking and serving layout for a smooth workflow and queue flow: prep, fryer, serving counter and payment.
Set up and laid out the serving area, including seating, power, water and food-safety arrangements.
Arranged power, lighting and water for evening service.
Designed the menu and set prices: fries, wraps, burgers, wings and drinks.
Built a repeatable menu with standard recipes and portion sizes so taste and cost stay consistent.
Sourced ingredients and managed suppliers and deliveries.
Managed stock: ordering, storage and keeping waste low.
Planned daily prep, schedules and service.
Tracked daily sales, costs and stock, and adjusted prices and the menu accordingly.
Coordinated helpers and shift timings, and ran service through peak hours.
Kept food hygiene and safety practices, including oil, gas and cleaning routines.
Handled customer service and quality standards.
Created the brand: name, menu board and signage.
Applies the same planning, scheduling and cost-control habits used on site.

07 / Contact

Let's build something.

Open to relocation.

joshuamartin4102002@gmail.com