Maps & Spatial Analysis

Spatial visualizations spanning rice agriculture in Arkansas, land use and waterlogging in Bangladesh, biodiversity conservation, and nutrient flow analysis. Maps were produced using ArcGIS, QGIS, R, and Google Earth Engine.

ArcGIS & QGIS Google Earth Engine MODIS / Landsat / Sentinel Spatial Statistics Land Cover Analysis Choropleth & Bubble Mapping

Arkansas Rice — Remote Sensing & GPP

VPM Cumulative GPP Arkansas

Spatial Profile of Rice Photosynthesis Across Arkansas

(A) Mean cumulative GPP (2008–2020) of rice at 500-m resolution modeled with the Vegetation Photosynthesis Model. (B) Mean latitudinal distribution of GPP, showing a north–south productivity gradient across the state.

VPM · MODIS 500 m Resolution
GPP Rice Production Region

GPP by Rice Farming Region

Spatial comparison of gross primary productivity across the distinct rice-farming regions of Arkansas, highlighting regional variability in crop carbon assimilation.

GPP Regional
GPP Yield Significance Map

GPP–Yield Correlation & Significance Map

Field-level map of the Pearson correlation between VPM-modeled GPP and reported rice yield, with significance overlay indicating where the relationship is statistically robust.

GPP · Yield Significance
Rice Growing Frequency

Rice Growing Frequency in Arkansas (2008–2020)

Pixel-level map of how often each field was planted with rice across the 13-year study period, derived from the USDA Cropland Data Layer using Google Earth Engine.

Cropland Data Layer GEE
EVI Spatial

Spatial Distribution of EVI Across Arkansas Rice Fields

Satellite-based map of the Enhanced Vegetation Index (EVI) showing canopy greenness variability across rice production areas, derived from MODIS imagery.

EVI · MODIS Spatial

Bangladesh — Land Use, Urban Growth & Waterlogging

Dhaka Chittagong Waterlogging

Newspaper-Reported Waterlogging Incidents — Dhaka & Chittagong

Choropleth map of council-level waterlogging incident frequency (2015–2018) in Bangladesh's two largest cities, derived from systematic newspaper archive analysis.

Urban Choropleth Climate Risk
Population Density Waterlogging

Population Growth vs. Waterlogging Events (2001–2011)

Bubble map relating population growth (circle size) to waterlogging frequency (circle color) across Bangladesh districts. Blue-bordered areas denote urban regions.

Urban Bubble Map
Urban Growth Rate Waterlogging

Urban Area Growth Rate vs. Waterlogging Events (2001–2011)

Bubble map relating urban area expansion rate (circle size) to waterlogging frequency (circle color) across Bangladesh districts, revealing how rapid urbanization drives flood vulnerability.

Urban Growth Bubble Map Flood Risk
District HANPP 2050

Historical & Projected HANPP by District — Bangladesh (1700–2100)

Time series projections of Human Appropriation of Net Primary Production (HANPP) for each district of Bangladesh, showing past land-use trajectories and modeled futures to 2100.

HANPP Time Series
Figure 3

Land Use Change — Bangladesh

Spatial characterization of land use transition patterns across Bangladesh, supporting the HANPP historical reconstruction study.

Land Use GIS
LGED CHT Sampling

Random Sampling Area Map — Chittagong Hill Tracts

Randomly selected field survey sampling points in the Chittagong Hill Tracts, with road network (LGED) overlaid to show site accessibility for field data collection.

Field Survey Forest

Biodiversity & Conservation

Sea Turtle Study Area

Sea Turtle Conservation Study Area

Study area map delineating the survey zones along the Bay of Bengal coastline used in the sea turtle nesting and beach profile investigation.

Marine Field Survey
Otter Signs Rajshahi

Smooth-Coated Otter Signs — Rajshahi Transects

Spatial distribution of 62 otter presence signs across five survey transects in Rajshahi, concentrated along riverbanks and adjacent terrestrial habitats.

Wildlife Transect Survey
Otter Presence Northern Bangladesh

Otter Presence Across Northern Districts of Bangladesh

Dot density map of otter occurrence records across northern Bangladesh, illustrating temporal and spatial distribution patterns across survey years.

Wildlife Dot Map
Rohingya Refugee Camp Map

Rohingya Refugee Camp Spatial Distribution

Spatial mapping of Rohingya refugee camp locations, supporting environmental and resource pressure analysis in the Cox's Bazar region of Bangladesh.

Humanitarian GIS Land Use

Nutrient Flow & Phosphorus Analysis

Global Phosphorus Substitutability

Global Substitutability of Recovered Phosphorus by Country

World map of the potential to replace conventional phosphorus with phosphorus recovered from the waste sector, illustrated using decoupling factors (values in parentheses per country). Published in Resources, Conservation and Recycling. View article ↗

Phosphorus Circular Economy Global
Phosphorus Production Districts

Phosphorus Production Levels by District — Bangladesh

District-level choropleth map of phosphorus production across Bangladesh, supporting nutrient flow and resource recovery analysis.

Phosphorus Choropleth
Phosphorus Stock Change

Changes in Phosphorus Stock Across Bangladesh's Divisions

Division-level map of phosphorus stock change over time, illustrating spatial patterns of nutrient accumulation and depletion across Bangladesh's agricultural regions.

Phosphorus Nutrient Flow Regional