Journal of Applied Geospatial Information 2021-07-21T10:57:59+00:00 Muhammad Zainuddin Zainuddin Lubis, S.Ik., M.Si Open Journal Systems <p>Journal of Applied Geospatial Information (JAGI) is a national&nbsp;and international peer review journal published by Politeknik Negeri Batam.&nbsp;The JAGI&nbsp;is issued 2&nbsp;times a year in electronic form, publishes Original Research Articles (full papers and short communications) and Review (full and mini-reviews) in all aspects of result research in the field of science/engineering: terrestrial and marine (geomatics, geophysics, geography, geology, geographic information systems, remote sensing, cartography, oceanography, hydrography, marine science and technology).&nbsp;We encourage all interested contributors to submit their work for consideration.&nbsp;<a href=";1488529534&amp;1&amp;&amp;">e-ISSN (Online):&nbsp;2579-3608 </a>; <a href=";container-title=Journal+of+Applied+Geospatial+Information">DOI:&nbsp;10.30871/jagi</a></p> Development of Kd(490) Algorithm Using Medium Spatial Resolution Landsat 8 OLI Arround Shallow Waters In Panggang Island 2021-07-21T10:57:59+00:00 Budhi Agung Prasetyo Wikanti Asriningrum Vincentius Paulus Siregar <p>The state of water quality around Panggang Island, Seribu Islands, in recent decades experienced degradation caused by human activities. The parameters of the diffuse attenuation coefficient (K<sub>d</sub>) is an important optical property-related attenuation of light in the water column, and its brightness. Landsat 8 data has potential to map the value of Kd(490) in regional waters in Indonesia. Landsat 8 data could provide solutions to spatial data availability of K<sub>d</sub>(490) values in addition to Ocean Color data. The purposes of this research was to developed empirical algorithm of Landsat 8 data to derive values of Kd(490) that can be use as tools for monitoring water quality optically on a regional scale which could not be done by Ocean Color data that has spatial resolution limitation. In-situ measurement of radiometric data was done by using TriOS-RAMSES hyperspectral spectroradiometer with a range of 320 – 890 nm and spectral sampling of 3.3 nm on shallow-waters around Panggang Island. The development of Kd(490) algortihm was done by simulation on ratio of Green and Near-infrared band has great determination values with K<sub>d</sub>(490) empirically, which that empirical algorithm can be applied on Landsat 8 data to derive its values. In addition, it is noted that the shallow-waters around Panggang Island, dominant affected by absorption of chlorophyll-a rather than scattering by suspended solids.</p> 2021-01-16T14:38:28+00:00 ##submission.copyrightStatement## The Geographic Information System of The Distribution of Larva Free Rates in Kediri City Area 2021-01-28T08:40:40+00:00 Ashafidz Fauzan Dianta Toga Aldila Cinderatama Fery Sofian Efendi <p>The process of representing the distribution of larva free numbers in the district of Kediri which is not visible makes the monitoring process for larva free rates per region less effective and efficient. Therefore, a geographic information system is needed to describe the distribution of larva free numbers in the Kediri Regency area. The design and development of this information system is carried out using two methods, one of which is the data collection method by conducting interviews with one of the staff in the Kediri district Health Office, observing and looking for references related to research.The existence of a Geographical Information System for the Distribution of Larva Free Numbers, helps the Kediri District Health Office in terms of recapitulating data and monitoring the risk of the distribution of larva numbers in the Kediri Regency area. The Geographical Information System for the Distribution of Larva Free Numbers in Kediri Regency was successfully designed and built and can display the distribution of larva free numbers in the form of markers on a map. The Geographical Information System for the Distribution of Larva Free Numbers in Kediri Regency uses PHP, HTML, CSS, JavaScript, MySQL, and the laravel framework.</p> 2021-01-28T08:24:19+00:00 ##submission.copyrightStatement## Condition of Coral Reefs and Reef Fishes in Dofa Village, Sula Islands Regency 2021-03-24T04:14:26+00:00 Alimuddin Alimuddin Nurul Chayati Tedy Murtejo La Ode M. Gunawan Giu Ria Fitri <p><em>Coral reefs are unique among ocean associations or communities that are entirely formed by biological activity. This study aims to determine the condition of coral reefs and reef fishes in Dofa Village, West Mangoli District, Sula Islands, 2018. Collecting coral data used the Line Intercept Transect (LIT) method, while coral fish data collection used the visual census method. Water parameters measured are temperature, salinity, degree of acidity (pH), brightness and current velocity. Based on observations, the water temperature ranges from 29.33° C - 29.9° C. The salinity of the waters ranges from 29.67 ‰ - 34 ‰. The degree of acidity is 7.5 which supports the life of coral reef. The water brightness level is 65% - 100%. The current velocity ranges from 0.02 m / s to 0.05 m / s. The condition of the coral reef ecosystem based on the percentage of hard coral cover ranged from 21.02% - 33.7% with low to medium category. The coral mortality index at the study location was small where at station 1 it was 0.487, station 2 was 0.335 and station 3 was 0.205, meaning that there was no significant change for live coral reefs. The abundance of reef fishes ranged from 0.52 ind/m2 - 1.22 ind/m2 which was dominated by the Pomacentridae and Labridae families where the two families were groups of fish that used coral reefs as habitat for feeding ground. The index value of coral fish diversity in the coral reef ecosystem at all stations ranged from 0.58 to 3.60 where the diversity index value was in the low to medium category. The uniformity index is included in the medium category with values ​​ranging from 0.58 to 0.63 which illustrates that the difference in the number of individuals for each species is not too significant. The dominance index of reef fishes at the observation station is very small, ranging from 0.03 - 0.07 which indicates that the dominance of the species is very low, so that the condition of the reef fish community is relatively stable.</em></p> 2021-03-24T00:00:00+00:00 ##submission.copyrightStatement## Mapping Monitoring of Environmental Conditions In Cilacap Waters 2021-02-11T06:54:32+00:00 Muhamad Kemal Idris Muqtasidun Hasri Wahyu Adi Setyaningsih <p>Cilacap waters are said to be busy with sea traffic with many activities being carried out in the Cilacap water area. Environmental monitoring activities are needed to determine the existing conditions in Cilacap waters, in order to support smooth and efficient traffic activities in Cilacap waters. This study uses a method in producing a mapping of environmental conditions, namely by looking at the aspects of changes in coastline, water depth (bathymetry), wind direction, and velocity, as well as models of surface currents speed and direction in Cilacap waters. The results of this study indicate that the environmental conditions in Cilacap waters are still relatively not much different from the conditions in the previous year, namely 2017. The value of modeling ocean currents which are influenced by sea tides and ebbs has a relatively small value with values ranging from 0.1-1.5 m / s with an average speed of 0.4 m / s that occurs in June (east season). In June 2020 the wind in the Cilacap water area blows from the east and southeast with speeds ranging from 2.5 - 7 m / s. The bathymetry measurement results showed a result of less than -2 meters. These results also indicate a relatively gentle seabed slope with a maximum depth of more than -30 meters in Cilacap waters. This clearly shows that the morphology of the coast and the condition of Cilacap waters are not relatively significant, experiencing changes every year.</p> 2021-02-11T06:45:04+00:00 ##submission.copyrightStatement## The Tsunami Simulation Generated by ‘Anak Krakatau’ Volcano Flank Collapse using MIKE 21Hydrodynamics Flexible Mesh with Manning Number Variation 2021-02-17T04:06:10+00:00 Hanah Khoirunnisa Wahyu Hendriyono Mardi Wibowo <p>This study aims to calculate the tsunami investment and the estimated arrival time at several locations around the Sunda strait, caused by the December 2018 Krakatao's eruption. The propagation of the tsunami wave is simulated using MIKE 21 Hydrodynamics Flexible Mesh (HD FM). The spatial data consist of the bathymetry and topography of the Sunda Strait area and its surroundings, whilst assumptions are made on the tsunami source topology and its exact location. Several runs of the simulation are then conducted by varying the Manning Number, i.e. bed resistance values, at the tsunami source and throughout the simulation domain, which accordingly would influence the propagation speed, inundation, and arrival time. Smaller Manning's values, which correspond to increasing roughness, are applied at locations closer to the tsunami source. In this simulation, Manning's number ranges from 10 to 40 m<sup>1/3</sup>s<sup>-1</sup>. Surface elevation, still water depth, and u and v velocity components are generated from this simulation.</p> 2021-02-17T00:00:00+00:00 ##submission.copyrightStatement## Coastal Inundation Model in the Coastal Area of Palopo City, South Sulawesi Province 2021-04-22T14:48:15+00:00 Riza Aitiando Pasaribu Pandu Setya Budi Muhamad Abdul Ghofur Al Hakim Farel Ahadyatulakbar Aditama Nurina Hanum Ayuningtyas <p>The impact of sea-level rise is perceived by many archipelagic countries such as Indonesia. The higher the sea level rises every year, the larger the disaster threat in the coastal area. The current condition of most coastal areas indicates various pressures caused by city development, including the coastal area of Palopo City in South Sulawesi Province. The sea-level rise is suspected to be the cause of coastal inundation in Palopo City which, so far has not been identified. Therefore, this study aims to draw a coastal vulnerability map of sub-districts in Palopo caused by coastal inundation using GIS technology. Analysis of the areas affected by coastal inundation is carried out by processing spatial data. The sub-districts areas affected by coastal inundation are only those located in the coastal zones. The affected area in Bara, Wara Selatan, Wara Utara, Wara Timur, and Telluwana sub-districts are 160.64 ha, 21.41 ha, 73.55 ha, 87.56 ha, and 56.65 ha, respectively. In Bara Sub-district, the areas affected by coastal inundation are residential and mangrove conservation areas. The affected areas in Telluwana Sub-district are residential, production forest, coastal conservation, and mangrove conservation areas. The affected areas in Wara Selatan, Wara Timur, and Wara Utara Sub-districts are all residential areas. By using sea-level rise data of 27 years with its highest tide model, the coastal inundation in 2040 which is predicted to occur in Palopo City can be modeled properly.</p> 2021-04-22T14:48:15+00:00 ##submission.copyrightStatement## Study of Groundwater Types Using the Vertical Electrical Sounding (VES) Method in the ‘Martani Field’ Ngemplak District of Yogyakarta 2021-04-27T22:22:26+00:00 Nurul Dzakiya Muhammad Faizal Zakaria Dewa Gede Eka Setiawan Robertus Belardo Laksmana <p>Study of groundwater types using the Vertical Electrical Sounding (VES) method in 'Martani Field’ Ngemplak District of Yogyakarta was done by carrying out eight measurement points to look for groundwater potential. This area is an area on the southern slopes of Mount Merapi which is included in the Yogyakarta Groundwater Basin. The type of lithology is identified based on the measurement of its resistivity value so that there are several types of lithology, namely Breccia (110-670 Ωm), Clay (1.99-10.12 Ωm), Sandstones (17.06-56.82 Ωm) and andesite lava (688-1657 Ωm). The bottom of the aquifer in this basin is composed of rock formations that are impermeable or semi impermeable which are non-aquifer, namely by Breccias, Clay and Andesite Lava. The existence of sandstones that act as aquifers is found near the surface at a depth of &lt;25 m and at a depth of about 60-100 m below the surface so that it is divided into two categories, namely shallow groundwater and deep groundwater.</p> 2021-04-27T15:29:17+00:00 ##submission.copyrightStatement## Spatio-temporal Variability and Trends in Rainfall and Temperature in Anger watershed, Southwestern Ethiopia 2021-04-27T22:50:57+00:00 Gemechu Yigezu Ofgeha Muluneh Woldetsadik Abshire <p>Insights to broadly argued research gap on lack of climate studies at micro-scale considering unique features of an area, this paper intended to examine agro-ecological level spatio-temporal trends and variability in rainfall and temperature in Anger watershed of southwestern Ethiopia. The gridded data managed by the Ethiopia National Meteorological Services Agency (NMSA) for 1983-2018 were used. The Mann-Kendall test for trend analysis and different variability measures were used. Questionnaire and FGD data on community perceptions gathered from 214 households and elders were analysed descriptively and qualitatively. The study reveals the consistent increasing trends in temperature; and high variability and insignificant but increasing rainfall trend. The trends and variability show spatio-temporal differences along agro-ecologies. The watershed is characterized by moderate to high rainfall coefficient of variations, significant years of high rainfall concentration, and considerable negative annual rainfall anomalies; that the variability was severe in woinadega followed by kolla agro-ecology. Although, the perceptions on trends, variability and its implications show difference across agro-ecology, the propensity to increased temperature, unclear rainfall trend and significant inter-annual and seasonal variability were witnessed. Unpredictability of rainfall time, concentrations in kiremt, and unexpected rain during harvesting was major challenges resulting multifaceted impacts on the small-scale farmers’ livelihoods.</p> 2021-04-27T22:46:24+00:00 ##submission.copyrightStatement## Land Price Modelling with Radial Basis Function (Case Study: Utan Kayu Selatan Village, East Jakarta) 2021-05-19T01:58:27+00:00 Sawitri Subiyanto Hana Sugiastu Firdaus Nahar Dito Utama Giardi <p>The price of land is an important matter that needs to be assessed by stakeholders. The study of land prices has an important role in seeing the stability of the property market. Several factors affect the property business such as accessibility, public facilities and social facilities. Utan Kayu Selatan is the largest village in Matraman Sub-District with an area of ​​1,12 kilometers. The potential of the property business is very tempting for investors to property developers. One of the economic sector developments is Utan Kayu Raya Road, which can increase land prices in the surrounding area. The factors that influence land prices can be analyzed through several approaches such as regression, mass appraisal and other. In this study, the method used in estimating land prices is the Radial Basis Function (RBF), by looking at the relationship between the distance of plot to roads, public facilities and social facilities. Modeling is carried out based on samples determined on ZNT and NJOP land prices. Furthermore, the calculation of the distance is done by using network analysis. As a result, the RMSE value for the NJOP RBF model and the ZNT RBF model is IDR 1.179.839 and IDR 2.972.345. Meanwhile, the CoV values ​​for both models were 6.2% and 6%. In the comparison of ZNT price predictions with market prices, the highest difference is IDR 13.119.915 and the lowest difference is IDR 537.009. While on the NJOP price prediction, the highest difference is IDR 15.797.583 and the lowest difference is IDR 291.270.</p> 2021-05-19T00:00:00+00:00 ##submission.copyrightStatement## The Impact of Covid-19 Pandemic on Land Surface Temperature in Yogyakarta Urban Agglomeration 2021-07-09T15:31:03+00:00 Erlyna Nour Arrofiqoh Devika Ayu Setyaningrum <p>Since the end of 2019, the world has been surprised by Corona Virus (COVID-19) pandemic. The first case of COVID-19 in Indonesia was reported in March 2020. The Indonesian policymakers have announced to limit social interaction by applying physical distancing and appealed to stay at home to slow the spread of COVID-19. Yogyakarta city is known as a tourism city and student city also affected by the presence of COVID-19. Many tourist destinations, schools, colleges, institutions, companies, and industries not operating as usually because people have been appealed to work and study at home. Less outdoor activities caused the vehicle emission in the street is rarely. This condition makes the temperature is cooler. This paper aimed to analyze the impact of the COVID-19 pandemic on the land surface temperature. Landsat 8 satellite data has been used to show the changes in LST before the pandemic, during a pandemic, and after the new normal. The results showed that during the emergence of the COVID-19 pandemic with reducing outdoor activities, the LST was lower than before the pandemic. Whereas after the new normal, the LST was increased.</p> <p>&nbsp;</p> 2021-07-08T16:39:26+00:00 ##submission.copyrightStatement##