Date:

Location:

Project:

Dec, 2019

Ipoh, Malaysia

To acquire topographic data for engineering and monitoring of mining.

Background

Ipoh is the capital city of the state of Perak, also the mining center of Malaysia. The survey zone is located in a mine group, 7 kilometers southeast of the center of Ipoh, with steep height difference (45-380m) and dense vegetation.

Requirements

Area Size: 1.25 square kilometres

Service: 1:500 topographic survey

Output Demand:  DEM, DSM, contours, geo-reference pointcloud, DOM

Accuracy Expectation: 10cm vertical

Project Duration: one month

Preparations

1. 1-days site visit, to select a location for a GNSS base station, and 2 locations for take-off and landing.

2. Determined flight altitute of aerial laser scanning and image capturing. 

Fieldwork

Part 1: LiDAR survey - aerial data capture
Equipment: UAV-based LiDAR system, multi-rotor UAV + Mini LIDAR system SZT-R250 (measuring range 250m)

Part 2: UAV photogrammetry - orthophoto imagery data capture
Equipment: UAV with SONY ILCE a6000 and PPK module

10 flights of aerial laser scanning, 2 days.

2 flights of aerial image capturing, 1 day.

Data Process

Accuracy verification: 1 day

DEM/DTM, contours, vector line map: 10 days

Orthophoto map: 2 days

Accuracy verification results:

    Standard deviation 0.0289cm