GISVENTURE

Explore. Map. Transform the World.

Explorations in remote sensing and GIS. Each one states what the data supports, where it stops, and what it connects to.

GISVENTURE banner: compass logo over a world map, with the line Explore. Map. Transform the World. Your guide to QGIS, ODV, and real-world GIS applications.

  • Southeast Asia’s haze: fires and forecasts together

    Aerosols, VIIRS active fires with CAMS five-day forecasts

    Shows
    Modelled mean aerosol optical depth falling by about 43% over five days, unevenly.
    Doesn’t show
    Smoke travelling from particular fires to particular places.
    Connected to
    Fire activity, winds at several heights, vertical mixing, rain washout.

  • Two NDVI maps are not the whole story

    Vegetation change, Ahmedabad, Sentinel-2, 2017–2026

    Shows
    Post-monsoon NDVI was higher in 2025 than in 2017.
    Doesn’t show
    A steady rise. The years between swung up and down.
    Connected to
    Rainfall and monsoon timing, vegetation phenology, irrigation, urban expansion.

  • What does a satellite measure when we map NO₂?

    Air quality explainer, Sentinel-5P TROPOMI

    Shows
    How much NO₂ sits in the whole tropospheric column.
    Doesn’t show
    The concentration at breathing height.
    Connected to
    Emissions, wind and mixing, atmospheric chemistry, weather.

  • Low-chlorophyll waters are spreading in the tropical Indian Ocean

    Paper explainer, ocean colour, 2015–2024

    Shows
    Regional and seasonal expansion of low-chlorophyll area, alongside warming, oxygen and pH changes.
    Doesn’t show
    A single cause. El Niño and the Indian Ocean Dipole shape the decade too.
    Connected to
    Surface warming, stratification, nutrient supply, monsoons, El Niño and the IOD.

  • From Trichodesmium in the water to signals from space

    Paper explainer, Arabian Sea, MODIS-Aqua

    Shows
    A spectral index that carries bloom pigment features through to satellite bands.
    Doesn’t show
    That every high-biomass patch is Trichodesmium. Spatial analysis is needed to separate them.
    Connected to
    Mixed phytoplankton communities, biomass variability, coastal water optics.
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