Trimble ® Geo 7X handheld Trimble Flightwave™ technology Rangefinder workflow best practices

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Trimble ® Geo 7X handheld Trimble Flightwave™ technology Rangefinder workflow best practices. Trimble Flightwave™ workflow integration Seamlessly integrated remote offset & measurement workflows o n the Trimble Geo 7X handheld. What is Flightwave ? . - PowerPoint PPT Presentation

Text of Trimble ® Geo 7X handheld Trimble Flightwave™ technology Rangefinder workflow best practices

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Trimble Geo 7X handheldTrimble Flightwave technologyRangefinder workflow best practices1

Trimble Flightwave workflow integrationSeamlessly integrated remote offset & measurement workflowson the Trimble Geo 7X handheld2Trimble Flightwave technology uses the combined sensors of the Geo 7X handheld, the Geo 7 series rangefinder module, and the Rangefinder utility or TerraFlex software to enable fast and simple remote measurement workflows directly on the handheld, without any additional equipmentWhat is Flightwave?

Laser rangefinder module Measures time of flight of an invisible laser to target to calculate distanceGeo 7X integrated GNSSUsed to provide accurate position informationfor the receiver

Geo 7X integrated sensorsProvide accurate orientation datato assist with calculation of remotefeature measurements

Geo 7X integrated cameraUsed for targeting and aiming

Flightwave technology dedicated software workflowsUsing the Rangefinder utility or TerraFlex software on the Geo 7X,calculate a variety of measurements for remote featuresat distances up to 200 m from the target

Rangefinder workflows4There are a variety of workflows to suit the field environment and objects being measured available in the free Rangefinder utility:

PositionSingle offsetMultiple offsetHeight1-shot2-shot3-shotWidth2-shot3-shotMeasureMissing lineRangefinder workflows

Use single and multiple offset options to measure horizontal distance to a targetInaccessible/difficult to get to targetsObjects in poor GNSS environmentsStand in a good GNSS environment, and use the rangefinder to record an offset GNSS positionCombine the devices GNSS location with the distance and bearing to the target to compute the offset location of the targetUse multiple offset with the Quickpoint feature in Trimble TerraSync software to capture multiple features quickly and easilySingle and multiple offset

Compass error can cause increased position error when using 1-shot offsetsApplications like Trimble TerraSync can eliminate this effect by combining multiple measurements in a single offsetUse Distance-Distance or Triple Distance offsets to eliminate compass error Complex offsets

Measure the vertical height of an object when you have a clear view of the top of the object you are measuringThis mode is best used when you and the feature are on the same level, and is particularly suitable for urban features such as power polesCombines a vertical measured height with a known vertical offset (device height)Make sure the correct device height is entered under Settings and that it is set to the approximate height of the device when performing the workflow1-shot height

Measure the vertical height of an object when you have a clear view of the top and bottom of the object you are measuringRequires direct line of site to both the top and bottom of the objectWorks well for scenarios where the user may be at a different elevation to the target featureNote: Assumes the object is vertical for objects on a lean use the Missing Line workflow2-shot height

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Measure the height of an object when you dont have a clear view of the top and bottom of the object you are measuringWorks well for scenarios where the top or bottom of the object can not be directly observed by laser measurementNote: Assumes the object is vertical for objects on a lean use the Missing Line workflow3-shot height

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Measure the horizontal span of an object or objects when you have a clear view of the object(s) you are measuringGood for measuring the horizontal clearance between two objects e.g. a tree and a building wall.Note: Outputs the horizontal span only for other measurements use the Missing Line workflow2-shot width11

Measure the horizontal span of an object or objects when you may not have an easy to view of the left and right spanGood for measuring the horizontal width of objects where the left and right edges are difficult to get a laser reading fromNote: Outputs the horizontal span only for other measurements use the Missing Line workflow3-shot width12The most versatile workflowRelies on having line of site for the laser to two remote pointsUse missing line to calculate heights and widths, spans of remote objectsMissing line can output horizontal, vertical and slope distances so does not require the target points (or the observer) to be on the same horizontal or vertical planeMissing Line

13Best practices14Any workflow that uses magnetic heading can be affected by compass error if the environment is not magnetically cleanTry to avoid working near large metallic objects where possible, and be aware of your surroundingsThe following table identified the sorts of objects that can negatively impact compass measurementsIdeal usage environmentsWithin ~6 inchesWithin ~6 feetWithin ~15 feetWithin ~30 feetCar keysMetal glasses framesCellphonesWatchesJewelryMetallic pensBatteriesOther computersSurvey nailsMetal clipboardsHydrantsValvesManhole coversPolesPower linesVehiclesLarge machineryMetallic buildings or structuresIf you are having trouble steadying the handheld when targeting objects at long distance, use the Monopole accessoryWhere possible aim at targets with the sun at your back to optimize exposure and screen visibilityReturn readings from the laser more difficult to detect when pointing directly at the sunJust like any other camera, it is difficult to correctly set exposure whenpointing directly the sunThe display works best when it is reflecting sunlight backat your eyes rather than having sunlight bouncing across the displayIncreasing usability

All laser workflows return the first hit by default.Some targets (e.g. wires or obstructed objects) are difficult to target with the first hit methodTo avoid false/incorrect readings use the streaming mode:Press and hold the Fire button for 1 secondThe laser will trigger continuouslyChoose either Nearest, Farthest, LastAvoiding false readings

Sensor calibration and alignment18Sensor accuracy may be affected by:Environmental temperature fluctuationsDevice internal temperature changes Local magnetic conditions and disturbancesField calibration ensures that sensors are outputting the most accurate possible data for your operating environment and device

CalibrationApplies corrections to orientation sensor outputs based on local conditionsTwo calibration techniques may be used:Fast calibrationFull calibrationSensor Calibration

Fast sensor calibrationAccounts for local magnetic effects and device stateFull sensor calibrationAccounts for local magnetic effects and device state, including compensating for temperature of the device

Fast calibration vs. Full calibration

Fast calibration should be used:If field applications are consistently reporting compass disturbance. For example, this may occur:When you are about to begin data collection at a different job siteAfter swapping the batteryIf it appears that sensor outputs are erroneousFull calibration should be used:The first time the device is usedWhenever the calibration utility recommends Full Calibration. For example, this may occur:If the device temperature or environment temperature has changed dramaticallyIf after performing a fast calibration, sensor measurement still appear to be erroneous

When to re-calibrateOnly calibrate outdoors.Try to calibrate as far away from magnetic disturbance sources as possible, be on the look out for:Ideal calibration environmentsWithin 6 inchesWithin 6 feetWithin 15 feetWithin 30 feetCar keysMetal glasses framesCellphonesWatchesJewelryMetallic pensBatteriesOther computersSurvey nailsMetal clipboardsHydrantsValvesManhole coversPolesPower linesVehiclesLarge machineryMetallic buildings or structuresStatic process: the device must be held stationary to capture full calibration points.3 rotations, capturing 8 static points per axis:Axis 1: Device flat, screen up to the skyAxis 2: Device sideways, screen up to the skyAxis 3: Device verticalUse the wizard to guide you through the rotations. Each point should be a 45 degree rotation (1/8th of a full circle) from the previous point. Check the video on www.trimble.com/geo7/

Full calibration process

Axis 1Axis 2Axis 3Rotate the handheld in all axes until the progress bar is full and calibration is successfulFast calibration

If you attach or re-attach a Geo 7 rangefinder module to the handheldAfter dropping the handheldAny other time you suspect that the camera and the laser pointer are not-aligned

When to re-alignPoint the handheld at a wall 4 to 6 m awayRun the Laser Alignment utilityUtility self-aligns the camera to the laser point

Laser alignment processAlign indoors or outdoors it doesnt matterAlignment works best:Pointing at walls at distances 3 to 6 m away when you can see the red dot yourselfIn dull light conditionsAt walls or surfaces with a plain, moderately reflective texture (e.g. a concrete or painted wall)When standing front on to the wallTry to avoid:Standing so far away from the target wall that the camera sensor can not detect the red dotStanding so close to the wall (closer than 2 to 3 m) that the distance sensor measurement becomes unreliablePointing at highly reflective surfaces so that it is hard to tell the exact center-point of the red dot in the camera framePointing at surfaces with a lot of shadow/light movement (e.g. tree shadow)Pointing at highly textured surfacesNot standing front on to the wall

Suitable alignment environmentsSimple field tests for checking sensor accuracy29Check the height of an object of known height.e.g. measure a pole or other feature of known height and compare the result with the height you know the structure to be.Check the inclination angle of an object of known inclination angle.e.g. measure the pitch of a roof