Accuracy assessment on low altitude UAV-borne photogrammetry outputs influenced by ground control point at different altitude

Unmanned Aerial Vehicles (UAV) photogrammetry is as precise as conventional survey which able to produce centimetre accuracy. It is considerably quicker and gives brief portrayal of geography. Given ideal regulatory conditions this innovation will supersede current techniques for most mapping and studying applications. UAV can be an important technology to extract useful information of the earth surface in short period of time for example Digital Surface Models (DSM) and other information. The final products are highly dependent on the choice of values on various parameter for the flight planning, and for the processing of the data. The aim of this research is to study the effect of Ground Control Point (GCP) influence on the final accuracy of the output with difference flying altitude. All photogrammetric procedure was applied using Agisoft PhotoScan a Structure from motion (Sfm) software from aligning photos to build Digital Elevation Model (DEM) and georeferenced orthophoto. In this research, we have used total of 16 GCP’s where the coordinates measured with L1 RTK GPS receiver. Analysis was carried out to show the importance of GCP for mapping using low cost UAV. The analysis of both qualitative and quantitative were carried out to verify that the use of GCP is essential to produce a centimetre accuracy photogrammetric output. Utilization of GCP in mapping is significant because the output obtained from photogrammetry comes with actual measurements of the model that we have mapped.

• Publication year

  2018

• Venue

  IOP Conference Series: Earth and Environment

• Publication date

  2018-07-31

• Fields of study

  Geography, Physics, Engineering, Environmental Science

• Identifiers
  DOI 10.1088/1755-1315/169/1/012031
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• Qualitative and quantitative analysis show that ground control points are essential for achieving centimetre accuracy in the photogrammetric outputs.

  Confidence 0.97

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• Agisoft PhotoScan and a structure from motion workflow were used to align UAV photos and build a digital elevation model and georeferenced orthophoto.

  Confidence 0.93

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• Ground control points measured with an L1 RTK GPS receiver were used to evaluate low-altitude UAV photogrammetry at different flying altitudes.

  Confidence 0.95

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review

• agisoft photoscan

  software

  The software package used to align photos and process the UAV imagery.

  Aliases: PhotoScan

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• centimetre accuracy

  accuracy level

  Output precision at the centimeter scale used as the target quality level for the photogrammetric products.

  Aliases: centimeter accuracy

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• digital elevation model

  product

  A gridded surface model generated from the processed photogrammetry outputs.

  Aliases: DEM

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• flying altitude

  parameter

  The UAV flight height varied during image acquisition.

  Aliases: flight altitude, altitude

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• georeferenced orthophoto

  product

  An orthorectified aerial image tied to map coordinates.

  Aliases: orthophoto, georeferenced orthophotograph

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• ground control point

  measurement reference, survey control

  A surveyed reference point with known coordinates used to georeference and assess model accuracy.

  Aliases: GCP, ground control points, GCPs

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• l1 rtk gps receiver

  instrument

  The GPS receiver used to measure the coordinates of the ground control points.

  Aliases: L1 RTK GPS, RTK GPS receiver

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• structure from motion

  workflow

  An image-reconstruction workflow that builds 3D products from overlapping photographs.

  Aliases: SfM

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review
• unmanned aerial vehicle photogrammetry

  method

  Photogrammetric mapping from UAV imagery used to derive terrain and orthophoto products in this work.

  Aliases: UAV photogrammetry, UAV-borne photogrammetry

  박진우 (dztg5apj7m) extractionB (s683577b42) reviewq (76h6bfydm6) review--------- ✂ Cut Here ✂ --------- (jqthcshryb) review

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