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All Journal Indonesian Journal of Geography Media Komunikasi Geografi Jurnal Geografi LIngkungan Tropik (Journal of Geography of Tropical Environments)
Andry Rustanto
Departemen Geografi FMIPA, Universitas Indonesia
Earth & Planetary Sciences Education Social Sciences

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Assessing the Reliability of Satellite-Derived Evapotranspiration Data Using Numerical Modified Penman Method at Citarum Watershed Evi Anggraheni; Faris Zulkarnain; Pranita Giardini; Kintan Maulidina; Babag Purbantoro; Raisya Afifah; Anang Muchlis; Siswanto Siswanto; Andry Rustanto; Muhammad Dimyati; Ahmad Zubair; Triarko Nurlambang; Ratih Dewanti; Iqbal Putut Ash-Shidiq; Irma Susanti
Indonesian Journal of Geography Vol 55, No 2 (2023): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.77725

Abstract

Evapotranspiration is an essential part of water availability analysis and crop water needs that are useful to estimate irrigation water demand. Since discharge measurement stations are limited, the analysis of water availability is the most important part of water management planning. Citarum watershed is the biggest watershed in West Java, supplies raw water to Jakarta, the capital city of Indonesia. Modified Penman is the common equation to analyze evapotranspiration, which was developed by Food and Agriculture Organization (FAO) and modified for tropical areas. Evapotranspiration is one term of the water balance equation. To determine water losses, it is necessary to solve this equation. Another source of evapotranspiration data is provided by the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite's standard product, MOD16A2. In order to used the evapotranspiration satelilite data to fullfill the lack of groud station data, the reliability of satelite data is needed. The objective of this study is to compares and analyzes the reliability of satellite evapotranspiration potential images with the numerical Modified Penman method at Citarum Watershed. Modified Penman is one of several methods that calculate the evapotranspiration potential based on climate data. MOD16A2 was used for simulation data, and Modified Penman was used for baseline data. The reliability of the two simulations was analyzed by the skewness percentage of each pixel and period. The distribution of percent skewness indicates the performance of satellite evapotranspiration on the Modified Penman that represents the actual condition. The sensitivity of satellites is greatly affected by local weather conditions.
DINAMIKA EROSI TANAH DAN KRISIS EKONOMI-ERA REFORMASI DI DAERAH ALIRAN SUNGAI SERAYU HULU Rustanto, Andry
Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments) Vol. 3, No. 1
Publisher : UI Scholars Hub

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Abstract

A large-scale horticulture crops practices in addition to land use / land cover changes in the upper Serayu Hulu catchment has been reported as the most responsible factor of the sedimentation acceleration in the downstream hydropower plant reservoir. This acceleration may become a serious problem for the hydropower plant because it would shorten the reservoir lifespan from the initial estimation. The problem could be further worst if the soil conservation practices application is still limited and land use / land cover changes that tend to increase run-off keep on progress. One of such situation in contrast has been occurred during 1997 - 1998 when financial crisis hit the country followed by the succession of the political regime. Due to the above situation, land use / land cover changes in the period expanded into higher elevation and slope. On the other hand, financial crisis has limited the attention of the horticulture crop farmers in applying soil conservation practices. This paper shows that those two factors together with climatic condition have increase the soil detachment in the hillslope before and after the country financial crisis and political regime succession in 1997 – 1998 by more than 100%. However, the soil detachment rate was then decreasing after some years even though still higher than before 1997
Spatial Pattern Analysis of Agricultural Drought in the Jatiluhur Reservoir’s Irrigation Area Using Normalized Drought Index (NDDI) MODIS Satellite Image Zubair, Ahmad; Sakina, N C; Khairunnisa, N; Siddiq, Ayyasy; Rustanto, Andry; Zulkarnain, Faris; Dimyati, Muhammad
Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments) Vol. 6, No. 1
Publisher : UI Scholars Hub

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Abstract

Agricultural drought occurs in various irrigation areas in Indonesia, one of which is the Jatiluhur Reservoir’s irrigation area. Agricultural drought in this area occurs due to several factors, including the natural phenomenon of climate anomalies which causes the length of the dry season, and also due to less optimal irrigation networks, damaged networks and other obstacles. But, not all agricultural land in the irrigated area experiences drought. Agricultural land affected by drought is important to know its spatial and temporal distribution to determine priority locations in drought disaster management, especially on agricultural land. Therefore, this study aims to examine the spatial pattern of agricultural drought in the irrigation area of the Jatiluhur Reservoir from 2000–2020. The index used in this study is the Normalized Difference Drought Index (NDDI). MODIS image version MOD13Q1 is used by dividing the dryness class into three classifications, namely dry (>0.5), rather dry (0-0.5), and normal (<0.5). The results showed that the most extensive drought in rice paddy fields occurred in 2015 with a dry index of 8574.19 Hectares. Meanwhile, agricultural drought in this area occurs on average from June to September, especially in the Jayalaksana Village and Setialaksana Village, Bungin Sub-District, Bekasi Regency. These two villages are affected by agricultural drought every single year. The spatial pattern of agricultural drought shows that it follows the pattern of the irrigation network. It is necessary to investigate the correlation between agricultural drought and irrigation network in the next research.
Monitoring Kekeringan berbasis Satelit untuk Identifikasi Potensi Kebakaran Hutan di Provinsi Jawa Timur Junilla Tristanti; Alya Arifa Danishara Afdal; Amirah Nayla Dinar Susena; Jennifer Marchelina Hutapea; Kuswantoro Marko; Andry Rustanto
Media Komunikasi Geografi Vol. 27 No. 1 (2026)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/mkg.v27i1.113599

Abstract

Kekeringan meteorologis akibat defisit curah hujan menjadi ancaman yang memicu peningkatan kebakaran hutan dan lahan di Provinsi Jawa Timur, terutama di wilayah timur yang secara geografis menerima curah hujan lebih rendah akibat pengaruh penghalang orografis Pegunungan Tengger-Semeru. Keterbatasan data pengamatan dari stasiun hujan darat mendorong pemanfaatan data presipitasi berbasis satelit. Penelitian ini bertujuan membandingkan data presipitasi dan nilai Standardized Precipitation Index 1-bulan (SPI-1) dari dataset CHIRPS dan PERSIANN-CDR periode 1995-2024 untuk mengidentifikasi potensi kebakaran hutan dan lahan di Jawa Timur. Pengolahan dan visualisasi data dilakukan menggunakan Google Earth Engine (GEE). Data CHIRPS di-upscaling ke resolusi 0,25° menggunakan metode mean resampling agar konsisten dengan resolusi PERSIANN-CDR. Indeks SPI-1 dihitung menggunakan distribusi Gamma untuk mentransformasikan anomali curah hujan bulanan menjadi indeks kekeringan terstandarisasi. Evaluasi kesesuaian antardataset dilakukan menggunakan koefisien korelasi Pearson (R) dan Root Mean Square Error (RMSE), serta didukung analisis deret waktu pada 12 kabupaten dengan riwayat kebakaran hutan dan lahan. Hasil penelitian menunjukkan estimasi presipitasi bulanan memiliki kesesuaian sangat tinggi (R=0,94; RMSE=48,42 mm/bulan), namun korelasinya menurun pada hasil SPI-1 (R=0,80; RMSE=0,59). Secara spasial dan temporal, CHIRPS lebih rinci dan konsisten dalam merepresentasikan kekeringan ekstrem dibandingkan PERSIANN-CDR. Pola kekeringan menunjukkan peningkatan risiko kebakaran ke arah timur Jawa Timur sehingga wilayah tersebut menjadi prioritas dalam sistem peringatan dini kebakaran.
Co-Authors Ahmad Zubair Alya Arifa Danishara Afdal Amirah Nayla Dinar Susena Anang Muchlis Ash Shidiq, Iqbal Putut Babag Purbantoro Evi Anggraheni, Evi Faris Zulkarnain Irma Susanti Jennifer Marchelina Hutapea Junilla Tristanti Khairunnisa, N Kintan Maulidina Marko, Kuswantoro Muhammad Dimyati Pranita Giardini Raisya Afifah Ratih Dewanti Sakina, N C Siddiq, Ayyasy Siswanto Siswanto Triarko Nurlambang Zubair, Ahmad Zulkarnain, Faris