Elevated Target Markers &
Elevated Target Markers (ETMs) and Spinner Target Markers (STMs) provide a means to connect independent photogrammetric networks that would otherwise not share common points. ETMs and STMs are imaged in more than one network, thus allowing multiple photogrammetry surveys to be linked into a uniform coordinate system.
Application in the field
By linking the networks above and below an overpass, police utilized iWitness to map a tanker explosion in a crash scene that was 1000 feet in overall length. The police investigator's on-scene time for this incident mapping, using two digital cameras, was only 70 minutes.
Motorist uses a cell phone to image a semi tanker explosion
Click here for an expanded view of ETM\STM use on the overpass
Trooper reviews imaging angles from multiple view perspectives
Trooper mapping the incident below the overpass while working around
Plan View of the trooper's iWitness mapping, the two freeways,
ETMs and STMs are applicable in many applications where intervisibility between surveys to be connected is otherwise difficult or impractical, a condition which can occur, for example, with crashes involving vehicles running over steep embankments.
Solutions for Complex Camera Geometry in Accident Reconstruction
ETMs & STMs designed for work with iWitness
STMs also allow the photogrammetric target to be spun on its axis, horizontally through 360 degrees. The STM is weighted with anti-slip grip tape installed to the base. STMs break down for easy storage and deployment. A galvanized plate is velcro hook and loop secured to the base.
The target components for both ETMs and STMs are removable for easy storage. When combining both ETMs & STMs, the user can easily achieve the required 2D separation of the target points that is necessary for a strong join within the unified 3D object coordinate system.
A quantity of two ETMs and three STM's are sold and ship as a set. The Manfrotto tripods displayed are for illustrative purposes. Any consumer grade tripod will work with ETMs.
STMs can optionally be purchased in sets of quantity 20, by special order request. Contact firstname.lastname@example.org for STM special order information.
- shipped most places internationally for $149.00us, and shipping.
Contact email@example.com for more information on your international order.
Shipments are typically made within 48 hours of receipt of the order.
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