Making th Lap: Achiving Cntimtr-Rang Accuracy with UAVs Francois Grvaix Product Managr, Survying
About snsfly A tam of ovr 150 passionat popl 100-200 units/month #1 in fixd-wing mapping drons (worldwid unit sals) Vry light UAS (0.5kg to 1.5kg), inhrntly saf, fail-saf bhaviors Fully automatd (with Motion) Drons Fixd-wing and rotary-wing Motion Flight planning & control
Accuracy vs rsolution GSD : 3 cm Accuracy : ± 3 m
B - R T K Th B RTK Built-in RTK-capabl GNSS antnna (GPS, GLONASS L1 and L2 ) In-flight application of RTK corrctions to gotags Ability of Motion to rciv corrctions via VRS Post-procssing ngin in Motion to corrct th absolut bas position (using Rinx data) Gotag accuracy: 2 cm horizontal / 3 cm vrtical Procssd projct accuracy: 1-3 x GSD (without GCPs!) Not: Th position masurmnts ar all don in WGS84 (whn using a bas station) (th datum and coordinat systm can b changd in Postflight Trra 3D)
Why RTK? GNSS accuracy guarantd in fild, right bfor flight Sam softwar & modm for a stand-alon or a RTK supportd mission No additional work or softwar Job don confidnc whn rturning to th offic Airborn stand-alon xprinc + trrstrial RTK 15-yar history = airborn RTK is a must
B - R T K B RTK Accuracy Assssmnt Crating a datast with Ground Chck Points (GCkP) Numbr of GCkPs: 19 ovr an ara of 0.2 km 2 Dvic: Doubl-frquncy GPS/GLONASS rcivr Corrction Sourc: swisstopo s Automatd GNSS Ntwork for Switzrland (AGNES) (Accuracy: 5 mm horizontal / 10 mm vrtical) Download th whitpapr: snsfly.com/brtk
B RTK Accuracy Assssmnt B - R T K Rsults: Point Cloud (optimal conditions, GSD 3 cm): 26 mm in horizontal, 31 in vrtical Orthomosaic & DSM: 33 mm / 35 mm Point Cloud (10% corrction uplink lost): 28 mm / 28 mm Point Cloud (advrs conditions, GSD 5 cm): 89 mm / 70 mm Conclusion: Th statmnt accuracy qual or bttr than 2 x GSD is confirmd RTK isn t just for prfct conditions RTK high-accuracy complis with UAV high-rsolution
Corridor mapping in rmotst Australia Scop: provid an arial survy of a 400m wid corridor along th 250km Talawana Accss Track (Wstrn Australia) Dlivrabls; 3D co-ordinatd data with accuracy to +/- 100 mm Contourd topographic data Orthomosaic photos to 5 cm rsolution Digital modl with 1m x 1m grid of 3D points
Corridor mapping in rmotst Australia Control obsrvd using Trimbl GPS quipmnt logging data to post procss using Goscinc Australia AUSPOS softwar Only thr xisting Standard Survy Marks availabl to mak connction along th 250 km corridor Corridor dividd into 15 km sctions RTK bas station stablishd at th middl of th sction ovr a nw stablishd control station Existing road was survyd vry 20 m using RTK GPS and Ground Control Points (GCPs) stablishd vry 2 km
Californian high-spd rail rout JL Pattrson, transportation nginring company First profssional dron dploymnt 30-mil rail corridor with an B RTK Rportd phnomnal data accuracy Compltd th job in a quartr of th tim of trrstrial survying and half th cost of mploying mannd arial srvics.
Californian high-spd rail rout Traditional survying would hav rquird lngthy prmits to accss th railroad right-of-way and constant intrruptions du to train traffic RTK rducs drastically th amount of work on th ground Sinc mapping its first rail corridor, JLP has put its B RTKs to work on a rang of subsqunt projcts, achiving similarly imprssiv outcoms.
Summary Why RTK? Compatibl with xisting bas stations Th B RTK is compatibl with most lading brands of bas station, working samlssly alongsid your xisting portfolio of instrumnts Fully intgratd workflow Th B RTK s supplid flight planning & control softwar (Motion) conncts to th bas station and broadcasts corrction data to th rovr (B RTK) no additional loggr or third-party softwar rquird. Survy-grad accuracy Absolut orthomosaic & digital surfac modl accuracy of down to 3 cm (1.2 in) without th nd for GCPs maning lss tim spnt in th fild and high prcision in vn th most inaccssibl aras. Larn mor: www.snsfly.com/brtk