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INDONESIA
Forum Geografi
ISSN : 08520682     EISSN : 24603945     DOI : -
Core Subject : Science,
Forum Geografi, Indonesian Journal of Spatial and Regional Analysis (For. Geo) is an open access, peer-reviewed journal that will consider any original scientific article for expanding the field of geography. The journal publishes articles in both physical and human geography specialties of interest to spatial analysis and regional analysis in (but not limited) Indonesia by applying GIS and/or remote sensing techniques.
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Articles 14 Documents
Search results for , issue " Vol 17, No 1 (2003)" : 14 Documents clear
Utilization of Aerial Photograph and Geographic Information System for Deposit Measurement of Wuryantoro Watershed, Wonogiri Santoso, Sugiharto Budi
Forum Geografi Vol 17, No 1 (2003)
Publisher : Forum Geografi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (870.972 KB)

Abstract

This research is carried out in Wuryantoro Watershed, Wonogiri, Central Java. The goal of this study is to examine the remote sensing tehnology capability to obtain the parameters of the physical data of land in the prediction of sediment yield. The approach used in landscape with the land unit as mapping unit by using MUSLE (Modified Universal Soil Loss Equation) model. The data analysis used the infrared aerial photo interpretation, which is combined   by Geographical Information Systems (GIS). Infrared aerial photo on scale 1 : 10.000 in 1991 is used as primary source of data to obtain the parameters of physical data of land. The data analysis uses the Geographical Information Systems. The prediction of the sediment yield is not done directly. First, predicated the runoff characteristi, which contains of runoff coeficient, runoff volume and peak discharge. Then the runoff charateristic with other influential factors (slope, soil, and land cover and conservation practice) are used to predict the sediment yield. The result of the prediction is tested by comparing them with the data of field measurenment result. The accuracy of the result of aerial photo interpretation for prediction sediment yield is 89.45%.
The Influence of Social-Economic Condition of People to Landuse Change and the Influence of Landuse Change to Runoff at Bodri Watershed, Kendal Laviati, Riani; Anna, Alif Noor; Suharjo, Suharjo
Forum Geografi Vol 17, No 1 (2003)
Publisher : Forum Geografi

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Abstract

This study is carried out in chacthment area of Bodri. The goals of this study are to kno the influence of economic social condition of population on the change of the kind of landuse and the influence of the change of the kind of landuse on the run-off area. This study uses survey method. The collected data are the economic social data of the population and the physical condition data in the research area. The result of the study shows that the economic social condition of the population in chatchment area of Bodri influences on the decrease of landuse. The decrease in landuse is 22.27% which used settlement, dry land cultivation (3.14%), yard (1.07%), plantation (0.44%), wet land cultivation (2.28%), embankment (0.25%), street and others (6.73%). The decrease in landuse causes peak discharge of Hydrograph in 1997, 1999, 2000, and 2001 increases respectively 87.32 m/second, 101.26 m/second, 58.37 m/second, 89.82 m/second, with each volume of direct flow 7.123.392 m, 6.011.604 m, 11.784.672 m, and 9.459.954 m. The run-off coefficient in 1992, 1997, 1999, 2000, and 2001 increase 7.7%, 13%, 19.8%, 23.2%, and 27.03%, with coefficient of annual flow 46.98%, 72%, 55.21%, 61,79%, and 75.55%. The increasing of the run-off coeficient and annual flow describes that the ratio both the discharge of maximum and minimum monthly flow becomes bigger. It means that in rainy season it will be flood immediately and in dry season it will be drought easily.
The Role of Sand and Stone Mining to Increase Family Income in Progo Catchment Ritohardoyo, Su
Forum Geografi Vol 17, No 1 (2003)
Publisher : Forum Geografi

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Abstract

The conzequence low income of the farmer household in agricultural sector is the increase in their activities as miner of sand and stone. It means for increasing of their household income. However, how important mining role on the increasing of household income has to be studied in deeply. The factual problem is the base for research aims, with the spesific stress on studying socio-economic characteristic of sand and stone miner, and the contribution of the mining income to household income. This research was carried out in Progo catchment area, Yogyakarta Special Region. Survey method was employed by data collecting from respondents. The respondents are head of households (HH) working as sand and stone miner. Sampling technique was proportionally simple random sampling in which 120 HH was taken as respondents sample. They were representatives of upper part, middle part, and lower part of Progo catchments area. Data on socio-economic structure of the household and household income were collected by mean of structured interview. Data analysis was performed through descriptive technique in which frequencies and cross tabulation varians statistic, and multiple regression analysis were mostly used. The research shows that there are relatively similarities on socio-economic characteristic of sand and stone miners, between at lower part, middle part with upper part of Progo catchments area. This existing of sand and stone mining employs about 70% labours are local miners and 30% labours came from out of the area. Landless farmers who land own less than 500 m2 characterize them. The most of them are male, withlow formal education, and as small family (4 people evey HH). Some of them have been as sand and stone miners for more than 4 years. Generally, they work less than 8 hours for mining every day. This research is also finding that the income of the sand and stone miners are seasonal. The averages of mining income on dry season (Rp 571,880 per month) are higher than on wet season (Rp 365,620 per month). The most important factor affecting income in this activity is the working hours spent. In average, the miner’s monthly income is Rp 468,760 is much higher than minimum level of basic need in Yogyakarta Special Region (Rp 328,750 per month). It means that sand and stone miner as a second occupation besides as a farmer increases household income be capable to satisfy the need of household economy. In general, it can be concluded that the activity has an important role on the increasing of household income.
Pattern Analysis of Vegetation and Structure Mapping of Yard Plant in Gatak District, Sukoharjo Anif, Sofyan
Forum Geografi Vol 17, No 1 (2003)
Publisher : Forum Geografi

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Abstract

Target of research is to know 1) level of type variety (diversitas) and mount the closeness (densitas) of lawn crop which conducting in region of District of Gatak of Sub Province Sukoharjo; 2) pattern of mapping of lawn crop which conducting in region District of Gatak of Sub Province Sukoharjo of pursuant to variety level and its closeness. This research is field survey done with the method of multi stage that is stratified purposive of sampling and random sampling. Focus the survey is does the stocktaking of lawn crop which conducting in house lawn. To know the structure of vegetate data processed by using formula Cox (1989) to know the closeness level, while to know the level of species variety, data analyzed to use the index of diversities Simpson. Pursuant to result of inferential solution and research 1) result analyze the structure of vegetate of lawn crop indicate that (a) District Gatak have the level of high diversities lawn crop, with the index diversities of equal to 0,84159 and index predominate equal to 0,15841, and also highest PIE 0,20657 and PIE lowerest of equal to 0,00032. Species of lawn crop having high domination that is melinjo (Gnetum gnemon), (b) closeness of lawn crop at every countryside in District Gatak of included in category very meeting of because  relied on by a closeness value of every countryside more than 75%. Crop found in research are having high closeness level for example: melinjo, banana, mango, rambutan, papaya, tapioca, and coconut, while crop having low closeness level for example: jambu mete, tapak doro, flower pukul empat; and 2) mapping of lawn crop cover the function value and amount of lawn crop found by a number of 57 type of lawn crop found in researh area, can be grouped to become 5 faction that is drug crop, vegetable faction, fruit crop, decorative crop, and protector crop.
Leather Industry Business Linkages (Case Study in District Magetan) Dilahur, Dilahur
Forum Geografi Vol 17, No 1 (2003)
Publisher : Forum Geografi

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Abstract

Leather industry in Magetan covers two forms; they are tanning and leathercraft. During 1960 and 1970, the leather industry decreased in its production, but in 1990 Magetan becomes the center of leather industry. Its development appeals to be studied closely. The goals of this study are to know the relation between tanning and leathercraft, the connection between these industries and other economic ativities, and their connection with production factor. This study uses survey methhod. The respondents are taken proportionally from both of those leather industries. The data is obtained inetrviewing the respondents with questionnaire that related to the input and out put of the industry. The result of this study shows that there is no relationship between the kind of industries (small and household industry) and its capital, especially in its raw material (44,44%). The relationship between tanning and leathercraft is low, because it is only 24,2% input of leathercraft which taken from output of tanning. The region relationship for tanning is larger, because the products that are sold to other regions are 97,22% for tanning and 68,29% for leathercraft. Its relationship to other sectors especially for labour supply is 56,48% from farming and trade sectors in marketing.
Easiness of Image Interpretation of Spot XS and Landsat TM for Urban Land Cover Object Identification Suryantoro, Agus
Forum Geografi Vol 17, No 1 (2003)
Publisher : Forum Geografi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (772.923 KB)

Abstract

The study that has been out for URGE project “Remote sensing for urban study and landuse planning” is a  especially the possibility and the easiness of interpretability. The easiness of interpretation of satellite image is influenced by sensor, and the physical condition of urban area. SPOT image recorded in 1996 and TM Landsat image recorded in 1994 by the process of digital image are used as the comparison of easiness of interpretation. The contras sharpening method using a filter, the arrangement of composite image, and multispectral classification is applied by respective image. The introduction of covered object of urban area is based on the introduction of spatial and spectral pattern. Visual and digital interpretation that based on multispectral classification has been done to get the accurateness of classification result. The result of this study shows that SPOT image has better detail information than TM Lansat image. But the spectral information of TM Lansat image has more varieties than that of SPOT image so that certain objects, especially straight appearance (street, river, etc) can be  know more by TM Lansat.
Flood Modelling of Banjir Kanal Barat (Integration of Hydrology Model and GIS) Marfai, Muhammad Aris
Forum Geografi Vol 17, No 1 (2003)
Publisher : Forum Geografi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (928.148 KB)

Abstract

Hydrological modelling has an advantage on river flood study. Hydrological factors can be easily determined and calculated using hydrological model. HEC-RAS (Hydrological Engineering Centre-River Analysis System) software is well known as hydrological modelling software for flood simulation and encroachment analysis of the floodplain area. For spatial performance and analysis of flood, the integration of the Geographic Information Systems (GIS) and hydrological model is needed. The aims of this research are 1) to perform a flood encroachment using HEC-RAS software, and 2) to generate a flood hazard map. The methodology for this research omprise of 1) generating geometric data as a requirement of the data input on HEC-RAS hydrological model, 2) Hydrological data inputting, 3) generating of the flood encroachment analysis, and 4) transformation of flood encroachment into flood hazard map. The spatial pattern of the flood hazard is illustrated in a map. The result shows that hydrological model as integration with GIS can be used for flood hazard map generation. This method has advantages on the calculation of the hydrological factors of flood and spatial performance of the flood hazard map. For further analysis, the landuse map can be used on the overlay operation with the flood hazard map in order to obtain the impact of the flood on the landuse.
Utilization of Aerial Photograph and Geographic Information System for Deposit Measurement of Wuryantoro Watershed, Wonogiri Santoso, Sugiharto Budi
Forum Geografi Vol 17, No 1 (2003)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (870.972 KB) | DOI: 10.23917/forgeo.v17i1.591

Abstract

This research is carried out in Wuryantoro Watershed, Wonogiri, Central Java. The goal of this study is to examine the remote sensing tehnology capability to obtain the parameters of the physical data of land in the prediction of sediment yield. The approach used in landscape with the land unit as mapping unit by using MUSLE (Modified Universal Soil Loss Equation) model. The data analysis used the infrared aerial photo interpretation, which is combined   by Geographical Information Systems (GIS). Infrared aerial photo on scale 1 : 10.000 in 1991 is used as primary source of data to obtain the parameters of physical data of land. The data analysis uses the Geographical Information Systems. The prediction of the sediment yield is not done directly. First, predicated the runoff characteristi, which contains of runoff coeficient, runoff volume and peak discharge. Then the runoff charateristic with other influential factors (slope, soil, and land cover and conservation practice) are used to predict the sediment yield. The result of the prediction is tested by comparing them with the data of field measurenment result. The accuracy of the result of aerial photo interpretation for prediction sediment yield is 89.45%.
Easiness of Image Interpretation of Spot XS and Landsat TM for Urban Land Cover Object Identification Suryantoro, Agus
Forum Geografi Vol 17, No 1 (2003)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (772.923 KB) | DOI: 10.23917/forgeo.v17i1.594

Abstract

The study that has been out for URGE project “Remote sensing for urban study and landuse planning” is a  especially the possibility and the easiness of interpretability. The easiness of interpretation of satellite image is influenced by sensor, and the physical condition of urban area. SPOT image recorded in 1996 and TM Landsat image recorded in 1994 by the process of digital image are used as the comparison of easiness of interpretation. The contras sharpening method using a filter, the arrangement of composite image, and multispectral classification is applied by respective image. The introduction of covered object of urban area is based on the introduction of spatial and spectral pattern. Visual and digital interpretation that based on multispectral classification has been done to get the accurateness of classification result. The result of this study shows that SPOT image has better detail information than TM Lansat image. But the spectral information of TM Lansat image has more varieties than that of SPOT image so that certain objects, especially straight appearance (street, river, etc) can be  know more by TM Lansat.
Flood Modelling of Banjir Kanal Barat (Integration of Hydrology Model and GIS) Marfai, Muhammad Aris
Forum Geografi Vol 17, No 1 (2003)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (928.148 KB) | DOI: 10.23917/forgeo.v17i1.590

Abstract

Hydrological modelling has an advantage on river flood study. Hydrological factors can be easily determined and calculated using hydrological model. HEC-RAS (Hydrological Engineering Centre-River Analysis System) software is well known as hydrological modelling software for flood simulation and encroachment analysis of the floodplain area. For spatial performance and analysis of flood, the integration of the Geographic Information Systems (GIS) and hydrological model is needed. The aims of this research are 1) to perform a flood encroachment using HEC-RAS software, and 2) to generate a flood hazard map. The methodology for this research omprise of 1) generating geometric data as a requirement of the data input on HEC-RAS hydrological model, 2) Hydrological data inputting, 3) generating of the flood encroachment analysis, and 4) transformation of flood encroachment into flood hazard map. The spatial pattern of the flood hazard is illustrated in a map. The result shows that hydrological model as integration with GIS can be used for flood hazard map generation. This method has advantages on the calculation of the hydrological factors of flood and spatial performance of the flood hazard map. For further analysis, the landuse map can be used on the overlay operation with the flood hazard map in order to obtain the impact of the flood on the landuse.

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