TWIG Interagency Fuel Treatments, United States

Fuel treatments and related land management activities across the United States, compiled by the Southwest Ecological Restoration Institutes (SWERI) from five federal and state reporting systems. 1,491,072 treatment polygons covering the 50 states, Puerto Rico and Guam.

This is the interagency record: US Forest Service activity data alongside Department of the Interior, state forester and interagency fuel-treatment records.

• Source: TWIG Data Resources, ReSHAPE
• Licence: CC-BY-4.0
• Citation: Call, A., et al. (2025). A new geodatabase of fuel treatments across federal lands in the USA. Scientific Data 12, 1485. https://doi.org/10.1038/s41597-025-05859-z
• Accessed: 2026-09-17 (publisher last edited the service 2026-09-02)

Assets

Read it with DuckDB

Show it on a map

The MapLibre source-layer is twig-treatment-index-2026-08 (the last segment of the dataset name, not the source layer name).

Four things to get right

1. Summing acres does not give treated ground

The same stand is thinned, piled, pile-burned, then re-entered years later. Each is its own polygon with its own acres, so the acreage column counts that ground several times. Repeat treatment is real and worth measuring, but it is not additional area.

Report both and say which is which.

2. Planned work is included

An unfiltered total overstates accomplished work by roughly 42%. Every tabulation must state its status filter.

3. Dates need a sanity window

treatment_date runs from 1202-02-10 to 2926-10-03.

Nothing has been removed. Apply an explicit window and report how many records you discarded.

4. On the hex, join on h8

Resolution varies with polygon size. 1,490,993 treatments are indexed at resolution 10, the 71 largest at 9, and the 7 largest at 8; native_res records which. A single 21,000 km² polygon would generate roughly 1.4 billion cells at resolution 10, so the largest are held coarser deliberately.

h8 is populated on every row. h10 is empty for the 78 treatments held at 9 or 8, so joining on the finest column silently drops them.

Per-treatment totals (acres, total_cost, cost_per_uom, SHAPE__Area, SHAPE__Length) are repeated on every cell a treatment covers. Reduce to one row per treatment before adding them up:

Relationship to facts-common-attributes-2026-06

737,013 of these records come from the same Forest Service source as the facts-common-attributes-2026-06 collection, but carry a reduced attribute set (no SUID, FACTS_ID, method/equipment codes, fund codes or per-unit costs) while adding four other source systems. Keep both, but do not union them — the Forest Service treatments would be counted twice.

Known data quirks

• error is multi-valued, semicolon-separated, so test with a containment match rather than equality: WHERE error LIKE '%DUPLICATE_DROP%'. 85,997 records carry at least one flag. Parsed counts: DUPLICATE_DROP 34,634, DUPLICATE_KEEP 30,473, BUFFERED_LINE 15,561, MODIFIED_SHAPE 2,694, BUFFERED_POINT 2,108, SPATIAL 815, HIGH_COST 550, CHECK_UOM 65, LARGE_AREA 4. DUPLICATE_KEEP records are the ones the publisher chose to retain; do not drop them.
• BUFFERED_LINE and BUFFERED_POINT geometries were synthesized from a line or a point, so their acres are not a measured footprint. 17,669 records.
• One record has no geometry. It is present in the GeoParquet and absent from the hex and tiles.
• One record is mislocated. A 1.9-acre Virginia treatment is mapped into the Atlantic off South America, flagged SPATIAL by the publisher. It is what stretches the bounding box east to 51°W.
• Guam is included (2 NPS treatments near 144.8°E), so a naive bounding box spans most of the globe. The collection publishes separate sub-bounding-boxes for the two clusters.
• SHAPE__Area and SHAPE__Length are in square degrees and degrees, not square metres and metres, because the source service computed them in longitude and latitude. Use acres for area.
• Stray whitespace was trimmed during conversion: 70,516 records in activity and 96,713 in equipment carried trailing spaces that would otherwise break equality filters. Ten records in the free-text name column retain theirs.
• uom is not always acres. 33 records are in miles and 32 are per-each; they cannot enter an acreage-based cost total. 145,076 carry no unit, which the publisher treats as acres.