The Tool Desk
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Choose the map that matches your question
| What you need to know | PRODES | DETER |
|---|---|---|
| Purpose | Annual monitoring and estimates of clear-cut deforestation in the Legal Amazon. | More frequent alerts about forest-cover changes, intended to support inspection and control. |
| Time frame | INPE says it has produced annual deforestation rates since 1988. Check the year attached to the estimate. | Alerts are made available daily, but the public portal updates with a deliberate one-week delay. Authenticated users can access daily data, according to TerraBrasilis’ FAQ. |
| Best use | Compare annual estimates over time, using consistent geography and dataset definitions. | Investigate more recent signs of change and identify potential locations for follow-up; do not substitute alerts for the official annual rate. |
| Geographic detail | INPE’s FAQ describes the maximum available rate breakdown as by Legal Amazon state. Municipality- or site-level estimates require spatial analysis of increment polygons. | Coverage and what a layer represents depend on the selected product. Some newer data for non-forest areas of the Amazon are experimental and may change; they are not the standard forest alert product. |
“Amazon” can refer to different boundaries. PRODES rates discussed here concern the Legal Amazon. INPE’s FAQ separately gives a cumulative figure for the Amazon biome, without a clear reference year, so it should not be treated as a current total.
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How to find and read the data
- Open TerraBrasilis. Use the Data Access portal to access, query, analyze, and download PRODES and DETER geographic data. The portal also provides metadata and web services.
- Select PRODES or DETER. Choose PRODES for annual clear-cut estimates and historical comparisons; choose DETER when looking for more recent alerts.
- Set the geography and period. Confirm the selected boundary, reporting year or alert period, and layer before interpreting a number. A result for the Legal Amazon is not automatically a result for the Amazon biome or another boundary.
- Read the dataset notes. Check the product’s methodology, update information, and any qualifications attached to the selected layer. TerraBrasilis reported a BiomasBR update on March 3, 2026, and advised users to update affected files.
- For analysis beyond the map, download the data and metadata. If combining new files with an older local dataset, check current release notes first. For municipality or protected-area estimates from PRODES increments, perform a spatial intersection rather than treating state-level rate summaries as local figures.
What satellite maps can and cannot show
Alerts are leads, not final annual totals
DETER is designed to provide faster alerts that help target inspection and control. Its purpose and timing differ from PRODES annual estimates, so counting alerts or adding their areas is not a substitute for an official PRODES rate.
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Cloud cover can prevent detection. Sensor resolution and the threshold used to flag change also affect which clearings appear. INPE’s Amazon Mission page describes a MODIS implementation with 250 m spatial resolution and a detection threshold above 25 hectares; those specifications are specific to that page’s MODIS description, not a definitive specification for every current DETER sensor or layer. NASA’s historical account notes that early MODIS-based DETER used conservative alerts to avoid false detections, which meant smaller clearings could be missed.
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Different boundaries and methods cannot be compared casually
Before describing an increase or decrease, ensure the figures cover the same geography, time period, and type of measurement. A state-level annual estimate, a polygon increment, and a more recent alert layer are not interchangeable observations.
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Official sources and further detail
- INPE: How is Amazon deforestation monitored? Covers the roles and limits of INPE’s monitoring systems; published September 23, 2024.
- TerraBrasilis: FAQ Explains access, timing, and dataset questions.
- TerraBrasilis: Data Access Provides access to geographic data and related resources.
- NASA Earth Observatory: Tracking Amazon Deforestation from Above Provides historical context for satellite monitoring and early DETER alerts.
- INPE: Amazon Mission – Uses and Applications Describes MODIS resolution and detection limitations.
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