Aerial mapping projects

 

Tekgra started off as a GIS company. Together with the range of professional services we offered satellite and radar images, LIDAR and manned aircraft imagery. When the drone technology became available, we were one of the first companies in Malaysia to offer aerial photography using drones.

Initially, we sourced drones from overseas, but they were somewhat fragile operating inside Sarawak plantations and jungle environments. Duration is also an issue, as usually the drones will need to fly a distance from the take-off point before reaching the area-of-interest. From 2011 onwards, we decided to design our own drones. We have been successfully flying and selling our drones since.

Below are some of the aerial mapping work done using our own designed drones


Aerial photography, Northern Sarawak.

This project covers approximately 1,800 Ha and 6,500 photographs were taken. Flying was completed in 6 flying hours. (Going there took much longer.)The drone flew over mountainous terrain at over 900 metres above sea level. It was a fine balance between flying low enough to get clearer pictures but not crashing into terrain, but not flying too high and ending up inside the clouds. At some places, the drone was flying just beside towering mountain ranges but only 100 metres below the cloud cover. A pair of binoculars was used to visually estimate the height of the bottom cloud cover before flight.




Oil plantation, Baram,Miri.

A small, well managed, estate, covered in 20 minutes by our drone, T6.




GIS Projects

We have been implementing GIS systems for over 20 years in Sarawak and Brunei′. Our key personnel started off implementing ESRI GIS systems in 1991 for Survey Department Brunei. At that time, the technology is still command-based (no pull-down menus), runs on an UNIX system and there is no database.

Since then, we have implemented virtually the whole range of ESRI products, from one of the first attempt at a sharing data, tiling, then ArcStorm, then ArcSDE and finally ArcGIS server. We implemented the first Internet Map Server ever, the ArcView 3 IMS. This is followed by ArcIMS, and finally ArcGIS Server on Oracle Spatial RDBMS.

Apart from ESRI products, we are now also implementing GIS systems in, for example, Autodesk Mapguide, Google Earth API, Auantum GIS and MapInfo. Each has its own strengths and weaknesses. Some are more cost-effective than others.

Below are some of the GIS systems that we have implemented:


Total rainfall volume distribution on GIS for Department of Civil Aviation , Brunei

This system calculates the daily rainfall distribution using data from weather doppler radar signals, which bounces signals from the rainclouds and the reflected signals is used to derive the moisture contents in the clouds.

The estimated rainfall volume can be extrapolated and the location split into grids and displayed on GIS.

We use Google Earth API, because this allows the information to be displayed on any user′s computer.







Web GIS for SESCO

This was basically built up from scratch using MapGuide and PHP for development.

Web GIS  



Esri ArcGIS

Arc GIS for a government department in Sarawak. Database designed and created in Oracle.

ESRI ArcGIS  


Mobile GIS system on 3G Samsung Android tablets

Using backend Autodesk Mapguide database, accessed in the field via 3G mobile network. Google Map data can be overlaid as backdrop. For a government agency in Kuching.


Web plantation GIS

A web based plantation GIS system developed for the oil plantation industry. Based on Autodesk Mapguide, enterprise or opensource. It is fully customisable. The build-in features includes production data, estate data, land cadastral information and weather data.

Aerial photo with tree count layer Yield gap analysis


Land titles with expiring quit rent Detail weather data for estate