Papers by Zulfikri Isnaen
Sixth International Symposium on LAPAN-IPB Satellite, 2019
The coastal area of Special Region of Yogyakarta (DIY) will experience rapid regional development... more The coastal area of Special Region of Yogyakarta (DIY) will experience rapid regional development after the functioning of the Southern Cross Roadway (JJLS) and New Yogyakarta International Airport (NYIA). In order to increase Regional Original Income (PAD) from the tourism sector, these developments must be welcomed with developments in the field of coastal tourism, especially in the form of ecotourism. The process of developing mangrove ecosystems for ecotourism in DIY must be synchronized with applicable government policies, especially policies that regulate spatial planning and development policies in the tourism sector. This study aims to analyze the existing conditions of mangrove ecosystems in the coastal areas of the Special Region of Yogyakarta. Mangrove mapping was carried out in four different locations, namely at Baros Beach, Kretek, Bantul Regency and Jangkaran Mangrove Forest Area, Kulonprogo Regency. Fieldwork consists of small format aerial photo data acquisition, Ground Control Point (GCP) and Independent Check Point (ICP) collection using Geodetic GPS, along with observations of mangrove conditions in the field. Post-field stages consist of various types of processes regarding processing field data and analysis, including orthophoto mosaics, accuracy calculations, and acquisitions of mangrove information such as area and distribution. The main benefit of this research is the availability of basic data on the existing conditions of mangrove areas in the Special Province of Yogyakarta. This basic data will then be used as a reference for managing the coastal environment and improving the economic conditions of the community through the development of mangrove ecotourism-based tourism. it also supports disaster risk reduction efforts through the development of mangrove ecosystems.
Sixth Geoinformation Science Symposium, 2019
Mangrove ecosystem is one of coastal resources that have many benefits for coastal communities. T... more Mangrove ecosystem is one of coastal resources that have many benefits for coastal communities. The mangrove ecosystem has very high economic and ecological functions if it is developed and preserved properly. Nowadays, many mangrove ecosystems are threatened by human activities. It is necessary to preserve and develop the mangrove ecosystems to avoid the impact of human activity and to increase their usefulness. In the process of developing the mangrove ecosystems, detailed data are required to provide a comprehensive overview of the environmental and physical conditions of the mangrove ecosystems. The study aims at identifying and making the inventory of the existing condition of the mangrove ecosystems related to mangrove cover and biodiversity. The data are collected using aerial photography (UAVs), field observation and measurement. The data inventory making is the first step in the process of developing and preserving the mangrove ecosystems. It finds that the use of the UAVs for the mangrove ecosystem data inventory making can give high accuracy data. The mangrove cover can easily be identified using on screen digitization analysis. The width of the mangrove in Baros coastal area is 2.59 hectares, consisting of Rhizophora, Avicennia, Bruguiera, Nypa and Acanthus, which is situated on the north part of Opak river and in the riverbank of Old Winongo river. Finally, the UAVs can be a promising technology in managing and monitoring the mangrove ecosystems.
Spectral reflectance of objects provides key recognition of objects from remote sensing data. Eac... more Spectral reflectance of objects provides key recognition of objects from remote sensing data. Each surface objects have their own specific spectral reflectance pattern that acts as a spectral fingerprint for object discrimination. This study aims to evaluate the effectiveness of radiometric correction applied to WorldView-2 image by comparing the image correction result with field spectrometer measurement. Some objects were chosen as the basis for observing object spectral reflectance, namely grass, non-mangrove vegetation, mangrove vegetation, soil, and asphalt. The WorldView-2 image was radiometrically and spectrally corrected up to at-surface reflectance level using provided procedures. For reference, the spectral reflectance of selected objects were collected in the field using a JAZ EL-350 field spectrometer (340-1028 nm). In order to perform a direct comparison and evaluation, the results of object spectral reflectance of field spectrometer were resampled based on the center w...
2019 5th International Conference on Science and Technology (ICST), 2019
Object spectral reflectance plays an important role in recognizing and discriminating object of i... more Object spectral reflectance plays an important role in recognizing and discriminating object of interests from remote sensing images. It provides key recognition of objects for image classification purposes. This study aims to compare the effectiveness of radiometric calibration algorithms applied to Small Format Aerial Photography (SFAP) and WorldView-2 (WV-2) images with the closed-range field spectrometer measurement. Some dominant objects were selected as basis for spectral reflectance observation, this includes grass, nonmangrove vegetation, mangrove vegetation, soil, and asphalt. The SFAP and the WV-2 image were radiometrically corrected up to at-surface reflectance level. As reference, the spectral reflectance of selected objects was collected in the field using JAZ EL-350 spectrometer. To compare the spectral reflectance results, spectral resampling procedure was applied to the spectrometer measurement based on the center wavelength of each images to match up the spectral resolution of the images. The results showed that the pixel values of the SFAP and WV-2 corrections have similar pattern. This pattern shows that the radiometric/atmospheric correction applied to WV-2 and SFAP has been successful and they have equal capability in differentiating sampled objects.
Indonesian Journal of Geography, 2021
Mangrove ecosystems are natural resources that have potential value for development due to their ... more Mangrove ecosystems are natural resources that have potential value for development due to their high productivity. Mapping and identification of mangroves have always played a crucial role in mangrove ecosystem conservation efforts, especially to support the sustainable development goal of coastal resources and climate change issues. Several attempts have been made using Unmanned Aerial Vehicle (UAV) techniques acquisition of high spatial resolution aerial images data with various sensors and object-based classification for image processing with various levels of success. This study aims to identify mangrove objects using UAV with true color and NIR false-color sensors using the OBIA approach. The UAV used in this study was DJI Phantom 3 Pro with a true-color sensor (default) and NIR false-color (modified Canon IXUS 160 cameras). The comparison between the two types of sensor of aerial photographs as a source for mangrove mapping proved that the latter performed better than the for...
IOP Conference Series: Earth and Environmental Science, 2020
Mangrove ecosystem is a natural resource that can be beneficial for coastal community. One of its... more Mangrove ecosystem is a natural resource that can be beneficial for coastal community. One of its benefits is it can be utilized as an ecotourism spot such as Baros Mangrove Conservation Area in Kretek, Bantul. Hence, mangrove ecosystem must be conserved or expanded if possible. The first step to conserving mangrove ecosystem is to map its existing condition. UAV can be used to acquire a high-resolution imagery quickly. With modified near-infrared (NIR) sensor from a pocket camera can produce three band i.e. NIR, green, and blue that can be used to calculate several vegetation indices such as Simple Ration (SR), Normalized Difference Vegetation Index (NDVI), and Enhanced Difference Vegetation Index (ENDVI). Those bands and vegetation indices then used to map mangrove using Geographic Object-Based Image Analysis approach. The result indicated that high-resolution imagery from modified NIR camera sensor can be used to detect mangrove and distinguish it from other object using supervis...
IOP Conference Series: Earth and Environmental Science, 2019
Coastal ecosystems such as seagrass beds can store large amounts of carbon over a relatively long... more Coastal ecosystems such as seagrass beds can store large amounts of carbon over a relatively long period of time, so a special study is needed for the seagrass ecosystem. Nirwana Beach located in Padang City presents an overview of extensive seagrass ecosystem. The carbon stock is estimated by utilizing Planet imagery with spatial resolution 3m with band ratio transformation method. Band ratio used are band ratio Green / Blue, Green / Red, and Blue / Red. Data processing is done based on correlation analysis and regression analysis between band ratio pixel value on image with value of carbon stock in field. The results show that band ratio of Green / Red has the highest r2 indicating a strong correlation relationship. The carbon stock in Nirwana Beach with total carbon 3,776,42 gC / m2 or or 3,78 kgC / m2. Accuracy test is done with standard estimate error where the highest accuracy value is obtained through the Green / Red band ratio with accuracy percent 59.98%. This research show...
Dalam pembahasan geografi sosial yang dibahas yaitu tentang segregasi perumahan yang berada di ko... more Dalam pembahasan geografi sosial yang dibahas yaitu tentang segregasi perumahan yang berada di kota. Maksud dari segregasi sendiri yaitu pemisahan kelompok ras atau etnik yang dilakukan secara paksa. Untuk mempelajari lebih dalam tentang terjadinya segregasi di perumahan perlu dikaji hal-hal dasar mengenai geografi sosial yaitu tentang hubungan sosial, perubahan yang terjadi di lingkungan itu, dan aktivitas sosial yang dijalankan.
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Papers by Zulfikri Isnaen