Survey control methods are often dictated by factors such as safety regulations, accessibility, shooting distances and this is why Sirovision has developed a wide range of flexible solutions to enable the accurate georeferencing of 3D images in all open pit mining environments.
A minimum of three known points, in any combination of surveyed camera positions or control points on the rock face is required in order to georeference entire mosaics of 3D images.
This means it is possible for Sirovision photographs to be taken hand held with a digital SLR camera with no requirement for tripods or levelling equipment!
Total Station or Theodolites
Available in most mine sites, survey data from these devices is easily imported and used in Sirovision to georeference 3D models to centimetre accuracy.
Real Time Kinematic (RTK) GPS
RTK GPS Rover & Base Stations are widely available for hire. Log files from RTK GPS devices can be easily imported delivering centimetre accuracy.
Solmeta Pro Geotagger
Attaching a Solmeta Pro Geotagger to a Nikon digital SLR camera writes GPS coordinates directly into your photographs. Sirovision requires only three images captured from different camera locations with geotagger data in order to georeference whole mosaics. Photographs can be taken hand held.
This method can achieve an spatial accuracy of +/- a few meters and is commonly used by consultants who have limited or no access to external survey support. No control points on the wall is required.
Similar to a GPS Geotagger, a hand held GPS can be placed on top of a camera to record the position of a single camera station.
A compass is used to record bearing and a laser range finder to measure distance to the rock face.
With these measurements, Sirovision can georeference a 3D image with an accuracy of +/- a few metres. No control points are required.