TreeHeight | TreeTally

1

Range-pole setup

No manual distance or ground-slope entry

TreeHeight computes the horizontal distance from the observer to the range pole from the known vertical pole length and the phone-measured inclination angles to the pole bottom and top. Keep the observer/camera position fixed while taking these angle readings and the whole-tree photograph.

Range-pole length (m) Actual physical pole length from RP-B to RP-T. TreeHeight corrects the visible sideways lean after the two pole endpoints are marked.

Range-pole position

Default. The pole is beside the tree, so no offset is needed.

Horizontal observer → poleWaiting for pole angles

Horizontal observer → treeCalculated after photo

Tree ↔ pole ground slopeNot needed at 0 m offset

Start the rear camera in Step 2, then capture the pole-bottom and pole-top inclination angles.

2

Photo and phone inclination

Starting sensor…

Live camera inclination—

Side tilt—

Captured camera inclination—

Range-pole angle calibration

Start the rear camera, keep the phone/camera at the same observer position, and use the center reticle. Aim the reticle at RP-B and capture its inclination; then aim at RP-T and capture again. TreeHeight computes the horizontal observer→pole distance automatically.

RP-B inclination (°) Auto-filled from the phone sensor; manual entry is available for laptop/testing. RP-T inclination (°) Must be greater than the pole-bottom inclination.

Horizontal observer→pole D = pole length ÷ [tan(RP-T) − tan(RP-B)]

Phone inclination is enabled by default whenever the browser permits it. On browsers that require a user gesture, starting the rear camera also requests sensor permission. Hold the phone in portrait, keep side tilt near 0°, and capture the tree inside this page.

Upload whole-tree photo

Camera inclination used for height calculation (°) Normally captured automatically at the instant the photo is taken. Manual entry remains available for testing/uploaded photos.

3

Mark the photograph

Drag the five crosshairs. B = tree base, MH = merchantable-height point, TH = visible tree top, RP-B = range-pole bottom, and RP-T = range-pole top. TreeHeight uses the RP-B→RP-T line to compensate for visible sideways pole lean. Crosses are stored separately from the source photo.

Capture or upload a whole-tree photo to begin.

Tree points Range-pole calibration

4

Calculate height

Waiting

Merchantable height (MH)—

Total height (TH)—

Horizontal observer → tree—

Horizontal observer → pole—

Tree ↔ pole slope (derived)—

Range-pole sideways lean—

Effective vertical pole length—

Calibration focal length—

Calculation details

No calculation yet.

Field procedure

Enter the known vertical range-pole length. Place the pole beside the tree when visible. Only if foliage blocks it, choose Moved toward observer and record the whole-metre movement: 1 m, 2 m, 3 m… along the same ground line.
Start the rear camera and keep the observer/camera position fixed. Aim the center reticle at the range-pole bottom (RP-B) and tap Capture RP-B angle; then aim at the pole top (RP-T) and capture its angle.
TreeHeight computes the horizontal observer→pole distance from the pole inclination angles and, after RP-B/RP-T are marked, corrects for the pole's visible sideways lean. Keep the pole from leaning toward or away from the camera because that out-of-plane lean cannot be fully recovered from one photograph.
Frame the complete tree and range pole. Use live camera zoom or two-finger pinch where supported; select a wider rear lens when available. Capture the whole-tree photo without changing the observer position.
After capture, use two fingers to zoom the photograph, one finger to pan, and drag B, MH, TH, RP-B, and RP-T to the exact image points.
If the pole was moved toward the observer, TreeHeight uses the known whole-metre pole↔tree separation and the tree-base sight angle to derive the horizontal observer→tree distance and the intervening ground slope automatically.