Geo-RemoteSensing

23/06/2026

Calculate NDWI in QGIS Using Landsat 8/9 Image | Water Body Mapping Tutorial

In this video, you'll learn how to calculate NDWI (Normalized Difference Water Index) in QGIS using Landsat 8/9 satellite imagery and generate a water body map step by step.

This method is very useful for water body mapping, surface water extraction, wetland monitoring, flood assessment, watershed management, hydrological studies, environmental monitoring, and geospatial analysis.

1. Add Landsat 8/9 Image in QGIS
2. Identify Green and NIR Bands
3. Open Raster Calculator
4. Apply NDWI Formula
5. Generate NDWI Raster
6. Visualize Water Bodies
7. Apply Suitable Symbology
8. Interpret NDWI Values
9. Extract Surface Water Areas

NDWI Formula:

(Band 3 - Band 5) / (Band 3 + Band 5)

Where:
Band 3 = Green Band
Band 5 = NIR Band

This workflow is commonly used in GIS, Remote Sensing, Hydrology, Watershed Management, Water Resource Assessment, Flood Mapping, Wetland Monitoring, Environmental Monitoring, and Surface Water Analysis.

Geo-RemoteSensing



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22/06/2026

How to download Google Earth image & Georeference in ArcMap

How to Download Google Earth Image & Georeference in ArcGIS | Step ...

20/06/2026

Calculate NDBI in QGIS Using Landsat 8/9 Image | Built-Up Area Mapping Tutorial

In this video, you'll learn how to calculate NDBI (Normalized Difference Built-Up Index) in QGIS using Landsat 8/9 satellite imagery and generate a built-up area map step by step.

This method is very useful for urban mapping, urban growth monitoring, built-up area extraction, land use land cover analysis, smart city planning, environmental monitoring, and geospatial analysis.

1. Add Landsat 8/9 Image in QGIS
2. Identify SWIR and NIR Bands
3. Open Raster Calculator
4. Apply NDBI Formula
5. Generate NDBI Raster
6. Visualize Built-Up Areas
7. Apply Suitable Symbology
8. Interpret NDBI Values
9. Extract Urban Areas

NDBI Formula:

(Band 6 - Band 5) / (Band 6 + Band 5)

Where:
Band 6 = SWIR 1
Band 5 = NIR

This workflow is commonly used in GIS, Remote Sensing, Urban Planning, Land Use Land Cover Mapping, Urban Expansion Analysis, Smart City Planning, Environmental Monitoring, and Built-Up Area Assessment.

Geo-RemoteSensing



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17/06/2026

Distance to River (Stream) Map – Watershed Analysis in ArcGIS

Created a Distance to River Map using the Euclidean Distance Tool in ArcGIS.

Distance to River (or Distance to Stream) represents the shortest distance of each location from the nearest stream or river channel. Areas located close to streams have lower distance values, while areas farther away have higher distance values. This parameter is widely used in hydrological studies, flood susceptibility mapping, groundwater potential assessment, erosion modeling, watershed management, and environmental planning.

This map shows the spatial variation of stream proximity across the watershed, helping researchers understand how river networks influence surrounding landscapes and environmental processes.

GIS and Remote Sensing tools provide powerful ways to visualize and analyze such spatial relationships for better decision-making and scientific research.

What do you think about this map? Share your feedback in the comments.

Geo-RemoteSensing