CHANGE DETECTION
STREAM's terrain change detection software compares two surveys and reports what changed between them — where material was added or removed, the net volume with an uncertainty band, and only the change that is statistically significant. Ideal for tracking mining, earthworks and erosion over time.
Change detection measures the difference between two elevation surfaces captured at different times. Beyond a raw difference map, a rigorous result reports volume with an uncertainty band and filters out change smaller than the survey noise.
STREAM uses a level-of-detection threshold (LoD) and optional co-registration to correct systematic shift between the two datasets, so the reported change is trustworthy.
This process — often called a DEM of Difference (DoD) — is the standard method for quantifying surface change between repeat topographic surveys.
See where material was added (deposition) and removed (erosion) as a clear color map between two scenarios.
Get net cut/fill volume with an uncertainty band, not just a single unqualified number.
Choose a confidence level so only change larger than the survey noise is kept as significant.
Correct systematic vertical shift between datasets, and export a PDF report plus raster/vector change layers.
Stockpile volume reconciliation at mine sites, quarry and pit production tracking, earthworks and construction progress verification, and coastal or riverbank erosion monitoring over time.
Bring in the earlier and the later terrain model. Each is kept as its own scenario, so the old model is never overwritten.
Both surfaces must be in the same coordinate system and vertical datum, otherwise the difference measures the misalignment instead of the change.
Draw or select the area being compared — a pit, a stockpile yard, a river bank.
Enter the level below which a difference is treated as survey noise rather than real movement.
Gain and loss appear as a coloured map with net volume; save the map as a raster and take the figures into the PDF report.
It compares two terrain scenarios and reports deposition, erosion and net volume with an uncertainty band, keeping only change above a level-of-detection threshold.
LoD is a confidence threshold: change smaller than the combined survey noise is filtered out, so only statistically significant change is reported.
Yes. Optional co-registration removes systematic vertical shift (and tilt) between the two datasets before computing change.
Free beta for Windows x64. Works fully offline with GeoTIFF, LAS/LAZ and DXF.
Download STREAM free