GEOGRAPHY & CARTOGRAPHY CALCULATOR
Ndbi Calculator
A precise tool.
What is the Ndbi Calculator & How does it work?
The Normalized Difference Built‑up Index (NDBI) is a spectral index designed to highlight urban built‑up areas by contrasting the reflectance properties of short‑wave infrared (SWIR) and near‑infrared (NIR) bands.
Built‑up surfaces typically reflect more SWIR radiation and less NIR radiation compared to vegetation, making the ratio (SWIR‑NIR)/(SWIR+NIR) an effective discriminator.
Values close to +1 indicate dense urban materials, while values near –1 correspond to vegetated or water bodies. The index is widely used in land‑cover classification and change detection.
\frac{SWIR – NIR}{SWIR + NIR}
SWIR = short‑wave infrared reflectance, NIR = near‑infrared reflectance
Parameters
Result
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Frequently Asked Questions
What is the Normalized Difference Built-up Index (NDBI)?
NDBI is a spectral index that uses SWIR and NIR bands to distinguish urban areas from vegetation.
How do I interpret NDBI values?
Values close to +1 indicate dense urban materials, while values near -1 correspond to vegetated or water bodies.
What is the purpose of using NDBI in geography and cartography?
NDBI helps highlight urban built-up areas by contrasting SWIR and NIR reflectance properties.
Can NDBI be used for other purposes besides urban mapping?
While primarily used for urban mapping, NDBI can also help differentiate between various land cover types.
What are the limitations of using NDBI?
NDBI may not accurately represent all built-up materials or distinguish between different types of vegetation.
Results are for informational purposes only and do not constitute professional advice.