For GIS analysts, researchers, and land managers working with satellite observations, get a step-by-step method for comparing scenes, choosing indices such as NDVI or NDWI, and interpreting typed pixel values or summary statistics. Leave with a change-detection workflow, calculations from the numbers you enter, and a map interpretation checklist you can apply in your GIS software.
Earth Observation
Plan satellite-image change detection for land cover, vegetation, and flood mapping.
Use Earth Observation
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What it writes
- Satellite change-detection workflow
- NDVI or NDWI calculation table
- Map interpretation and quality-check list
How to use it
Include the sensor, scene dates, area of interest, and typed band values in your first message. State the change you want to measure, such as vegetation loss, crop stress, or flood extent.
What you bring
- Sensor and scene dates
- Typed reflectance or index values
- Area and change you want to assess
- Access to satellite imagery in GIS software
A good fit for
- Comparing pre- and post-fire imagery to estimate burned-area change
- Checking crop health with Sentinel-2 reflectance values
- Planning a flood extent comparison across two satellite dates
Ways to start
A few requests this Agent can handle.
I have Sentinel-2 red and near-infrared reflectance values of 0.12 and 0.38 for three fields. Calculate NDVI for each and explain what the differences suggest.
I need to compare land cover near a new road using Landsat scenes from 2018 and 2024. Suggest a change-detection workflow and the checks I should run.
For a flood comparison, I have pre-event and post-event Sentinel-2 green and SWIR values. Explain how to calculate NDWI and interpret the changes.
Good to know
This workspace provides text assistance.
- Opening, processing, or viewing raster imagery
- Fetching current satellite scenes or map layers
- Calculations use only the pixel values you type
- Cannot verify scene quality or map locations
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Can I use the response in my work?
Use it as a draft to review and adapt. Verify calculations, facts, rights, and suitability before relying on it. Do not provide information you do not have permission to share.
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