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Month July 2025

Digital Topography: Understanding DEM, DSM, and DTM

In today’s era of spatial data and remote sensing, mapping the Earth’s surface has gone far beyond traditional paper maps. Technology allows us to create detailed 3D representations of terrain using digital elevation data. Three models commonly used in digital…

Topographic vs. Thematic Maps: What’s the Difference?

Maps are essential tools for understanding our world. But not all maps are created the same. Two of the most commonly used types are topographic maps and thematic maps. At first glance, they may look similar—but they serve very different…

Satellite Image Colors: What Do They Mean?

When looking at satellite imagery, the colors you see are not just aesthetic choices—they carry meaning. From red forests to black lakes and orange landscapes, satellite images are powerful tools for monitoring environmental change. But what do these colors actually…

What Is a Satellite Hotspot—and Does It Always Mean Fire?

Every year, news and environmental reports mention “hotspots” seen from satellites. These glowing red dots on digital maps often trigger public concern, especially during dry seasons. But what exactly are they? And do they always indicate wildfire? Defining a HotspotA…