Date:

Location:

Project:

Dec, 2019

Ipoh, Malaysia

To acquire topographic data for engineering and monitoring of mining.

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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.

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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

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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. 

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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.

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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

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