Angle of Draw Subsidence Calculator
Invert actual independently detected subsidence-limit offsets and depth to angle FROM VERTICAL, not forward panel-width influence envelope or safe exclusion zone. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
An angle of draw relates a measured subsidence-limit offset to panel depth.
An angle of draw relates a measured subsidence-limit offset to panel depth.1
This tool reports the angle from vertical under that geometric convention.
When to use Angle of Draw Subsidence Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
How to use Angle of Draw Subsidence Calculator and understand its results
- Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
- Enter observedPanelEdgeToSubsidenceLimitM, observedMatchedPanelDepthM, using the field meanings and rules below, then run the tool.
- Read observedDrawAnglesFromVerticalDeg. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedPanelEdgeToSubsidenceLimitM | Observed panel edge to subsidence limit m | list of number | Required |
| observedMatchedPanelDepthM | Observed matched panel depth m | list of number | Required |
Use aligned offsets≥0 and depths>0 in metres. Return atan(offset/depth)×180/π. A zero offset gives zero degrees; no limit-detection method is supplied.
angleFromVertical=atan(offset/depth)×180/π Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| observedDrawAnglesFromVerticalDeg | Observed draw angles from vertical deg | list of number |
{
"input": {
"observedPanelEdgeToSubsidenceLimitM": [
10,
20
],
"observedMatchedPanelDepthM": [
10,
10
]
},
"output": {
"observedDrawAnglesFromVerticalDeg": [
45,
63.43494882292201
]
}
}Limitations and assumptions
Units, ledger boundaries, survey interpretation and model applicability must be independently established. These summaries do not assign reserve/resource classifications or establish support adequacy, ventilation safety or an operating setting.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Lists and matrices must be dense, without missing cells. Numeric lists allow at most 10000 entries; ordinary string lists allow at most 128 strings of 128 UTF-16 units each; numeric matrices allow at most 128 rows and 128 columns, subject to narrower requirements above.
Alternative or Complementary methods
For a related step, use Subsidence Curvature Calculator: Subsidence curvature measures change in slope across a measured displacement profile. For a complementary comparison, use Pit Depth Calculator: A rim-to-floor depth needs paired elevations sharing the same datum.
References
-
Angle of Draw Subsidence Calculator — tool.io
Similar or alternative tools
- Subsidence Curvature Calculator
Subsidence curvature measures change in slope across a measured displacement profile.
- Pit Depth Calculator
A rim-to-floor depth needs paired elevations sharing the same datum.