Dr. Noorhadi Rahardjo Profile

Dr. Noorhadi Rahardjo

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Proceedings Article | 29 January 2024 Paper

Spatial modelling of inundation flood using remote sensing and geographic information system in Bogowonto Watershed, Purwodadi and Bagelen, Central Java

Amelia Rizki Gita Paramanandi, Sudaryatno ., Noorhadi Rahardjo, Taufik Hery Purwanto

Proceedings Volume 12977, 129771M (2024) https://doi.org/10.1117/12.3009650

KEYWORDS: Floods, Modeling, Remote sensing, Geographic information systems, Visualization, Java

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Purwodadi and Bagelen sub-districts are areas that are frequently inundated by floods from the overflow of the Bogowonto River. These inundations can disrupt community activities and has an impact on material, social and economic damage. Therefore, it is necessary to have an effective and efficient flood potential in the Bogowonto watershed. The purpose of this study is to extract data of land use and river geometry using remote sensing data and geographic information systems for estimating flood discharges and constructing flood inundation spatial models using HEC-RAS and ArcGIS software in return periods 1, 2, 5, 10, 20, 50, and 100 years. Modeling is doing with integrating HEC-RAS and ArcGIS software. This study generally carried out hydrological and hydraulic modeling in the Bogowonto watershed. Hydrological modeling was carried out to convert rainfall data into flood discharge using the Nakayasu Synthetic Unit Hydrograph. The data used is the maximum daily rainfall for 2010-2022 from 10 rain stations in the Bogowonto watershed. Hydraulic modeling was carried out to simulate flood inundation using the HEC-RAS software with 2D unsteady flow simulation. The data required in this study are river geometry, design flood discharge, and Manning’s values. River geometry data and Manning’s values were obtained from digitizing remote sensing data in the form of DEMNAS and Sentinel-2A. The results of the modeling were analyzed and visualized using ArcGIS. This study shows that remote sensing data and geographic information systems can extract land use and river geometry data, which can then be used in flood modeling.

Proceedings Article | 29 January 2024 Paper

Analysis of land use dynamics in Kulon Progo Regency

Westi Utami, Catur Sugiyanto, Noorhadi Rahardjo

Proceedings Volume 12977, 1297709 (2024) https://doi.org/10.1117/12.3009235

KEYWORDS: Agriculture, Analytical research, Industry, Sustainability, Roads, Vegetation, Statistical analysis, Climate change, Standards development, Spatial resolution

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Infrastructure development and industry are a bridge in driving economic growth. On the other hand, the impact of development and population growth also encourages land conversion and suppresses the existence of agricultural land. This research aims to analyze land use change from 2015 to 2021 in Kulon Progo Regency and its relationship with occupation. This study used spatial analysis through overlay to map land use changes in Kulon Progo Regency. Land use maps were obtained from Sentinel images in 2015 and 2021. Image interpretation was supervised through the random forest algorithm. Meanwhile, occupation change data was obtained from Yogyakarta population statistics. Descriptive quantitative analysis is used to determine the relationship between the decline in agricultural land and the decline in the number of occupation in the agricultural sector. The result shows that the impact of development and industry has changed rice fields in Kulon Progo Regency from 26,530.29 Ha in 2015 to only 20,507.70 Ha in 2021. The reduction in rice fields in this regency was also followed by a change in the community occupations, from 48.25% of them working in the agrarian sector in 2015 to only 41.62% in 2021. The decrease in uncontrolled agricultural land area is feared to cause a decline in farmers' welfare and the threat of food availability

Proceedings Article | 29 January 2024 Paper

Learning the past landscape of Yogyakarta city from historical maps

Ari Cahyono, Bowo Susilo, Niken Wirasanti, Noorhadi Rahardjo

Proceedings Volume 12977, 129770C (2024) https://doi.org/10.1117/12.3009197

KEYWORDS: Cultural heritage, Geography, Georeferencing, Analytical research, Geographic information systems, Cartography, Army

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Cultural landscapes reflect humanity's creative genius, social evolution, imagination, and spiritual life. The city of Yogyakarta in Indonesia is an ideal example of a cultural landscape reflecting the works of Hindu-Buddhist, Islamic, colonial, reform to contemporary civilization. Reconstructing historical landscapes and regions is critical for preserving historical memory. Geographical names are a possible way to build community identities. Our research aims to trace the multitemporal landscape from historical maps in Yogyakarta. This study conducted a comparative cartographic analysis of several historical maps of Yogyakarta City, focusing on some of the critical changes and phases during the era. We used topographic maps produced by the Topografische Dienst of the Dutch East Indies, the US Army Map Services, and the Indonesian Geospatial Information Agency to trace the historical landscape in Yogyakarta City. We digitized geographical names as they were presented on the historical maps. Indonesia Geographical Features Cataloging was followed to create a geodatabase. The results of this study showed how the dynamics of geographical names change based on historical map tracing. Additionally, there have been changes in the territory boundaries. This dataset of historical geographical names can serve as a database for preserving cultural heritage and as a basis for sustainable development in Yogyakarta City.

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