Mr. Jonh P. Lubis's Field Research Report No.3-No.6
Preparation for Ground Checking
September 14, 2010 was my first day in my office in Bogor after our National Holiday due to Idul Fitri Celebration. Brief presentation and discussion with the staff of my head office were the first things I did. I received some inputs regarding my ground check planning. My ground check map needed to be improved. My collegue who is an expert in GIS helped me to rearrange and layout the map. It was very useful for me to have smooth ground check during my research in the field.
Starting Ground Checking
My research is about "Land Use Change Study in Bodri Watershed by Using Remote Sensing and GIS". Bodri watershed is situated in the north of Central Java Province of Indonesia at latitude 7˚23’00” to 7˚54’08” South and longitude 109˚52’01“ to 110˚08’06” East. The watershed covers four regencies that are Semarang, Kendal, Wonosobo and Temanggung. The upstream of Bodri watershed is located in Temanggung Regency and the downstream in Kendal Regency. Officially, Bodri watershed area is a part of BPDAS Pemali Jratun management in Semarang which is the regional office of the Ministry of Forestry. In order to analyze the change which occurred in Bodri watershed, ground check is required. However, firstly I should have an official ground check permit letter from BPDAS Pemali Jratun. Finally, after waiting for three weeks, BPDAS Pemali Jratun gave me permition. I was very happy that they were ready to help me. Therefore I decided to stay there for about three weeks. On September 20, 2010, at 4 PM, I left Bogor to go to Semarang by bus. It took about ten hours. This was really a new experience to go to Semarang. All of the trip I could not sleep, because I saw many beautiful views and I really enjoyed the journery.
After arriving in Semarang on September 21, 2010, I went to BPDAS Pemali Jratun office. I met the head of BPDAS Pemali Jratun Office and discussed my research. I was lucky, because they really supported me. We arranged the research schedule. The first two weeks would be allocated for ground checking and remaining one week for data collection.
The downstream of Bodri watershed is situated in Kendal regency which covers almost 60% of Bodri watershed area. As previously planned it will be the first area we visit. We will explore thirteen sample points there which had been classified into seven land covers that are pond, water, paddy field, dry farming, mix garden, forest and settlement. We estimated that the exploration of sample points would take four days. Fortunately, we could accomplish it within three days, from September 22 – 25, 2010. Handy GPS, camera, ground check map and motorbike are the important tools that we used every day. From thirteen sample points, as many as ten sample points were appropriate to the land cover that I had classified before and three sample points were inappropriate. During conducting ground check, we also recorded several new coordinate sample points as ground control points. The first day of survey, we explored four sample points which are comprised of three land covers: pond, paddy field and settlement. The sample points were easily found due to the location close to the main road. Whole land covers that had been classified were also appropriate to the existing land covers.
On t he second day of ground check, we explored four sample points which are comprised of four land covers that are dry farming, paddy field, settlement and forest. As with the first day, we found all sample points easily and the existing land covers were appropriate to land cover classification in the ground check map.
The third day of ground check, we had very small difficulties on the exploration of five sample points which consist of five land covers that are settlement, dry farming, plantation, water and forest. The sample point locations are quite far away from the road network. In addition, climate barrier such as rain had contributed negatively to our ground survey. So, sometimes we had to delay the journey. Forest and mix-garden were the most difficult to do exploration. However, we could find successfully all sample points.
The upstream of Bodri watershed is located in Temanggung regency and covers a small area of Kendal regency. We will verify twelve sample points which had been classified into six land covers that are paddy field, dry farming, mix garden, plantation, forest and settlement. Seven sample points are located in Temanggung regency and five sample points located in Kendal regency. We estimated that the exploration of sample points would take five days from September 27 to October 2, 2010.
Exploration of sample points in the upstream is much more difficult than downstream. Topographic factor such as hilly area and the distance from main road are the major obstacles. The rain also slowed down our exploration. Therefore, our expedition became six days.
Seven sample points in Temanggung which are classified into forest, dry farming, paddy field and settlement were explored for four days. Five sample points were appropriate with the existing land cover and two sample points were inappropriate. The existing land cover of dry farming is settlement and paddy field is dry farming. We also took five existing land covers and recorded their coordinates as our new ground control points.Finally we fully completed the exploration of Bodri watershed from downstream to upstream within two weeks. I really enjoyed it. It was my new unforgettable experience on ground checking.
To Be Continued