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Daniel Adi Nugroho dot Net

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Geoscience




“Approaching Terrain, Approaching Terrain”

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Not all of LIDAR data acquisition flights are fun and fascinating. Never in my life was I gripped with the near-death experience as close as what I am about to tell you in this post. 

In August 2011, I was aboard the most luxurious and spacious survey aircraft I’ve ever seen, a shiny, well-furnished, air-conditioned, 9-year old Cessna 208 Caravan with a large hatch on its belly. It has a “toilet” too! All other aircrafts that I’ve ever flown on survey sorties are usually more than 30 years old, cramped, hot, smelly, and doesn’t look very safe. This particular machine is really a belle. The avionics looks quite modern, with weather radar, autopilot, and all. For the propulsion, it has a turbine engine driving its three-bladed propeller. I really love the whirring noise and the deep roar of the turbine engine during the starting up, compared to the less appealing thudding and cranky sound of piston engine startups.

Long story short, by 4:30 PM we have finished our LIDAR and photo survey job over Pelabuhan Ratu coastal area, south of West Java, and we were ready to fly back to Halim Perdanakusuma Airport in Jakarta. We were flying at about 7000 feet, and there were four people on board, the two pilots, myself, and the security officer from the Air Force. Unfortunately, bad weather confronted us, and the pilot decided to take an alternative route. I saw the dark, menacing wall of clouds on the horizon in front of us. However, a few minutes after we took the alternate route, we found ourselves completely enveloped by thick clouds all over the place. No discernible horizon, no visible terrain, no blue sky, nothing, just dull, dark-gray colour outside, decorated with tiny streams of rainwater outside the windows. 


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Last Updated on Monday, 07 May 2012 05:35
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LiDAR Airborne Survey: How I Learned to Stop Worrying and Love the Flight

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Yeah I know, I slightly modified Stanley Kubrick’s masterpiece to fit the mood of this article. Don’t know what I’m talking about? Don’t worry, just read on.

So… I’ve been working on my new job as an airborne LiDAR survey technician for less than a year. After working for more than 6 years in various office positions in Intermap/ExsaMap, I decided to take a leap of faith to work in McElhanney Indonesia as a field technician, instead of an office worker. In Intermap/ExsaMap, I’ve worked in data processing and production, software development and engineering, and before I go, sales and marketing. I’ve tried trading stocks as a side-job, which failed miserably after less than 2 years. Now I am trying to work at the field, where most of my time is spent outside the cubicle, under the sun.

The reason why I’m interested in this new job is that it offers a vast mix of expertise to learn. It combines many different aspects of Geomatics, from remote sensing, photogrammetry, GPS survey, some familiarity of aviation protocols, understanding of many different aircraft types, and basic knowledge of meteorology, as well as project management. It also involves some muscle work of lifting heavy crates of equipments and installing the bulky LiDAR system into the aircraft.


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Last Updated on Saturday, 03 September 2011 10:54
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Digital Elevation Model Visualization of the Volcanoes of Indonesia

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Gede-Pangrango

In this article, I'd like to provide some visualization of some of the well-known volcanoes in Indonesia using Intermap's Digital Elevation Model derived from its proprietary IFSAR technology. These visualizations were made using GlobalMapper v11 (shaded reliefs) and 3DEM v20.7 (rotating movie). Included here are the following volcanoes: Tangkuban Perahu Volcano (West Java), Merapi Volcano (Central Java), and Mount Batur (Bali). More volcanoes will be added soon.

These shaded relief images conveys the perception of depth by employing shading effects. For visual appeal, color shader is also involved, with gradation from dark green for low elevation areas, to yellow for medium elevation, and dull brown for high elevation. Based from the shaded relief, people will be able to interpret prominent terrain features such as craters, valleys and ridges, outcrops, lava flows, faults, flood plains, and so on. A more compelling visualization is the 3D perspective, which further emphasizes the perception of depth.

If you are interested to Intermap's Digital Elevation Model dataset represented here, or perhaps you'd like to know more about the NEXTMap Indonesia dataset, feel free to contact me.


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Last Updated on Wednesday, 30 January 2013 11:03
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