Unsuitable Areas Research Articles

GIS-Based Land Suitability Analysis for Solar Powered Irrigation System in Non-Irrigated Rice Production Areas of Davao Del Norte

The Solar-Powered Irrigation System (SPIS) flagship program of the Department of Agriculture (DA) has been undertaken with the purpose of creating a vibrant agricultural economy, but its provision is currently limited due to its budget allocation. Because of this, detailed information and accurate planning are essential in identifying the most suitable locations for SPIS installation, optimizing system potential and maximizing limited resources. This study aimed to develop a provincial land suitability map of SPIS that will serve as a tool for farmers, Local Government Units, and other interested entities. Its result was obtained by combining the Analytical Hierarchy Process and the Geographical Information System Weighted overlay technique. The obtained data indicates that 0.10% (334.93 ha), 29.40% (102,696.34 ha), 37.24% (130,078.61 ha), 4.79% (16,746.29 ha) and 28.47% (99,439.60 ha) of Davao del Norte province are positioned in extremely, highly, moderately, less, and unsuitable areas, respectively. Extremely suitable areas are found in Samal (314 ha), Sto. Tomas (15 ha), and Panabo (7 ha), with non-irrigated rice production areas of 67 ha, 288 ha, and 125 ha, respectively. Asuncion and Kapalong have the highest non-irrigated rice areas of 739 and 721 hectares, respectively, with a total rating of 90% for highly suitable (22,097.95 ha) and 29% (11,241.40 ha) for moderately suitable. Non-irrigated rice areas intersect mostly in highly suitable regions; it is highly recommended that these municipalities are prioritized in establishing SPIS projects.

Suitability Evaluation and Layout Optimization of the Spatial Distribution of Rural Residential Areas

A reasonable layout optimization strategy of rural residential areas can improve the quality of life of rural residents and promote rural revitalization. Evaluating the suitability of rural residential areas is the basis of layout optimization. Based on 1:100,000 land cover data and a digital elevation model (30 m) for the Henan Province, China, we used the minimum cumulative resistance model to evaluate the spatial distribution suitability of rural settlements in the Zhengzhou administrative area (abbreviated: Zhengzhou). Then, we used a weighted Voronoi diagram to determine the scope of influence of central villages and determined the direction of relocation for the “combined migration” rural residential areas. The study results support the following conclusions: (1) the comprehensive resistance value of rural residential areas in the Northeastern part of Zhengzhou is low and the suitability is high. However, the comprehensive resistance value of the Southwestern part is high and the suitability is low. (2) The study area can be divided into highly suitable areas, suitable areas, generally suitable areas, unsuitable areas, and extremely unsuitable areas. Unsuitable areas and extremely unsuitable areas accounted for 33.66% of the total area and included 662 rural residential areas. (3) The rural residential areas were divided into four types of optimization: urbanization, key development, controlled development, and combined migration. Based on an analysis of the characteristics of each type of rural residential area, we proposed corresponding optimization strategies. The results remedy the lack of layout optimization strategies for large-scale rural residential areas and can provide support for the optimization of the layout of rural residential areas in Zhengzhou. Furthermore, the research techniques may apply to other regions.

Zoning plan-based legal confiscation without expropriation in Turkey in light of ECHR decisions

The right to property is a fundamental human right guaranteed by international conventions. In countries like Turkey, where the principles of private ownership apply, this right is guaranteed by laws. The right to property may be restricted by law only in the case of public interest. Nevertheless, the right of ownership of immovable property can be transferred to the public authority only with payment. However, in some cases, a person's immovable property may be de facto converted into a public facility without expropriation. This process is called “confiscation without expropriation”. This concept was introduced into the Turkish Legal System in 1956 by the unauthorized conversion of immovable property for a road. Today, especially in planned areas, a different type of confiscation without expropriation is often seen. Zoning plans are known to be public tools that reorganize properties in public interest. However, the uncertainty in the implementation process of these plans negatively affects the owners of parcels reserved for public use in the zoning plan. This situation is defined in terminology as “legal confiscation without expropriation”. In this study, the subject has been discussed in the light of the European Court of Human Rights (ECHR) decisions and Turkish judicial decisions, and which institutions are responsible for what kind of zoning functions within zoning plans have been investigated. Official (ex officio) applications and voluntary applications have been compared. Conceptual illustrations on the subject have been prepared. According to the results obtained from the study, it has been stated that all public spaces in the zoning plan are not subject to legal confiscation. Due to their location or characteristics, protected areas, unsuitable geological areas and parcels remaining in agricultural areas can be allocated as public spaces in the zoning plan. In such a case, it is not possible to say that there is legal confiscation. In terms of plan classification, there may be legal confiscation in areas if only a 1/1000-scale implementary zoning plan is in practice. As a solution for legal confiscation, land and real estate arrangements should be made ex officio and without delay. In addition to this, alternative models are also needed. Otherwise, public institutions will be subject to severe financial burdens. Some of the proposals include: granting construction right to zone cadastral parcels affecting public facility areas, or granting the right to construct all cadastral parcels in the plan in specified amounts and also developing a zoning right transfer system.

Analysis of potentially suitable habitat within migration connections of an intra-African migrant-the Blue Swallow (Hirundo atrocaerulea)

Bird species that occupy highly specialised ecological niche are susceptible to environmental and climatic change. These species can easily be moved into extinction by small anthropogenic or natural changes to their habitat. It is paramount to understand and assess the uncertainties of the impacts of climate change on the species to adopt adaptation strategies and provide revised management actions. Based on two emission scenarios Representative Concentration Pathway (RCP2.6 and RCP8.5) set by the Intergovernmental Panel on Climate Change (IPCC), we predicted the potential distribution of Blue Swallows (Hirundo atrocaerulea) habitat suitability under current and future scenarios using a maximum entropy (MaxEnt) model. Eight variables were selected from 21 bioclimatic, elevation and land use/ land cover covariates based on their model percentage contribution in MaxEnt and correlation analysis. Our results demonstrate that maximum temperature of the warmest month (Bio5) and precipitation of the warmest quarter (Bio18) are the most important variables in determining the distribution of potentially suitable habitat for the Blue Swallow. Furthermore, our results suggest that Blue Swallow suitable habitat will decrease with increase in latitude while decreasing with an increase in longitude due to climate change. The predicted fundamental niche was much larger than the realised niche, suggesting that other anthropogenic and ecophysiological parameters may limit occupation of the suitable habitat; thus, the actual distribution extents may continue to decline in the future. We conclude that there is a negative impact of climate change on the distribution of Blue Swallow habitat and any increase in temperature results in the surge of unsuitable areas. Therefore, unless strict protection is awarded to the current suitable habitat, the suitable habitat and population of the Blue Swallow will continue to decline. Our results can be used by Blue Swallow conservationists and decision-makers to draft adaptive countermeasures to cope and mitigate for climate change.

STUDY ON ECOLOGICAL AND ENVIRONMENTAL SUITABILITY OF TOURISM RESOURCES DEVELOPMENT IN LIJIANG RIVER BASIN OF GUILIN, CHINA

Abstract. Ecology and environmental suitability are widely used in urban ecology and regional ecology. However, there is still a lack of systematic evaluation method system for the research impacts of tourism development and tourism resource development on ecology and environment in ecologically sensitive scenic spots. Taking Lijiang River Basin, an ecologically sensitive area with typical karst landforms, as an example, this paper analyses the ecological and environmental suitability of tourism development from the perspective of space. In this paper, TM image and DEM model were firstly used to extract NDVI, slope, slope aspect and other related data. Then, based on the characteristics of the study area, the data of each factor was graded and assigned with a grade value, and the spatial situation of each single factor was analyzed, and superposition was carried out at last. Meanwhile, the study area is divided into three levels for tourism development, namely, unsuitable area, sub-suitable area and suitable area.

Land suitability assessment for optimal cropping sequences in Katihar district of Bihar, India using GIS and AHP

The main objective of the study is to assess land suitability for suggesting suitable crop sequences in Katihar district of Bihar, India. We first selected site-specific factors and assigned their weights using analytical hierarchy process (AHP) for land suitability assessment. The layers of factors were integrated to prepare land suitability map. The findings revealed that of the total area (3.05 million ha), the largest area (48.5%) was marginally suitable for agriculture followed by moderately suitable (30.8%) and highly suitable (2.9%). Nearly 17.8% area was found unsuitable for agriculture. Rice–maize–rice, rice–maize–jute and maize–maize–rice were found suitable crop sequences in all suitability classes. Multilinear regression analysis between land suitability and factors shows that soil texture, nitrogen, phosphorus and potassium, pH and drainage proximity influenced land suitability. The study suggested soil reclamation, application of adequate amount of fertilizers, assured irrigation and flood control for sustainable crop sequences in the study area. Land restoration and soil reclamation measures should be taken to transform unsuitable areas for crop cultivation. Use of integrated geographical information system and AHP approach for analyzing land suitability and crop sequences may add a new dimension in spatial information science.

Macaca leonina has a wider niche breadth than sympatric M. mulatta in a fragmented tropical forest in southwest China.

Niche differentiation has long been identified as an essential stabilizing mechanism for the coexistence of sympatric species. Using camera trapping data obtained during 2012-2016, we identified Macaca leonina and M. mulatta as the dominant macaque species in the Naban River Watershed National Nature Reserve (NRW-NNR), a tropical forest in southwestern China. In general, M. leonina exhibited a wider distribution and greater niche breadth than co-occurring M. mulatta. According to a fitted maximum entropy model (MaxEnt), M. leonina was predicted to predominantly occur in forest at higher elevation, whereas M. mulatta was predicted at lower elevation; the broadleaved evergreen forest was predicted as the most suitable vegetation for both species to inhabit, while the unsuitable area was bordered by rubber plantation, in which both food scarcity and human disturbance restricted the movement of macaques. Although the niches of these two species highly overlapped across space and time, we also found evidence for their spatiotemporal niche differentiation. When the two species inhabited independent areas with different elevations and vegetation, they maintained a similar activity pattern; however, in the zones of overlap, their activity patterns differed significantly. Further comparative field studies of these two macaques, considering other niche dimensions, are required to ensure their coexistence and long-term conservation.

Mapeamento de risco em áreas urbanas densamente habitadas: o morro do Jaburuna (Vila Velha, ES, Brasil)

O Morro do Jaburuna é um complexo rochoso densamente povoado, localizado no município de Vila Velha (Espirito Santo, Brasil). Devido à sua elevada declividade e à presença de blocos e depósitos de Tálus, as encostas possuem alta susceptibilidade a movimentos de massa. A metodologia adotada foi uma adaptação de metodologias já consagradas, visando facilitar a identificação de áreas suscetiveis ao risco pela população em geral. Este mapeamento subsidiou a setorização de áreas impróprias e resguardadas para ocupação urbana, possibilitando uma maior segurança para a população residente, além da elaboração do mapa de eventos já ocorridos. A hierarquização do risco se fez necessária para a priorização de ações de redução, prevenção e resposta ao risco pelos agentes públicos e pela sociedade.

Invasion risk of the South American tomato pinworm Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) in India: predictions based on MaxEnt ecological niche modelling

The South American tomato pinworm Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is a recent invasion in India, causing widespread infestations in tomato crop in the States of central peninsula, especially Maharashtra and Karnataka. Hitherto, this pest was not reported to occur in India and thus presumed to be of exotic origin. The present study attempted to delineate the potential habitat suitability of geographical areas for spread and distribution of T. Absoluta in India. We have modelled the potential habitat distribution of T. absoluta using algorithm in Maxent, a maximum entropy modelling program. The climate niche for T. absoluta was developed based on the relationship between presence only data for 64 places and a reference climate data for the year 2000. This established relationship was then used to predict the changes in potential distribution under future climatic conditions of 2050. The future climate data from SRES A1b emission scenario at a resolution of 10 arc minutes were used for analysing climate change impacts. The predictions from Maxent were mapped in DIVA GIS, an open source computer aided tool for mapping and analysing spatial data. The established model in Maxent gave a reasonable estimate of T. absoluta range with better discrimination of suitable and unsuitable areas for its occurrence under current and future climatic conditions. This was evident from the highest value of AUC i.e. 0.968 and 0.874 for training and test data, respectively. A Jacknife test for variable importance indicated that Bio3 (isothermality) with highest gain value was the most important abiotic factor influencing the potential habitat distribution of T. absoluta. Temperatures >30 °C and precipitation >500 mm were found to have detrimental effects on distribution of T. absoluta. The modelled habitat distribution of T. absoluta will be a useful guide for researchers and plant protection workers to frame appropriate management strategies against this invading pest insect to cope with the future climate change conditions.

Assessing the Potential Distribution of Asian Gypsy Moth in Canada: A Comparison of Two Methodological Approaches

Gypsy moth (Lymantria dispar L.) is one of the world’s worst hardwood defoliating invasive alien species. It is currently spreading across North America, damaging forest ecosystems and posing a significant economic threat. Two subspecies L. d. asiatica and L. d. japonica, collectively referred to as Asian gypsy moth (AGM) are of special concern as they have traits that make them better invaders than their European counterpart (e.g. flight capability of females). We assessed the potential distribution of AGM in Canada using two presence-only species distribution models, Maximum Entropy (MaxEnt) and Genetic Algorithm for Rule-set Prediction (GARP). In addition, we mapped AGM potential future distribution under two climate change scenarios (A1B and A2) while implementing dispersal constraints using the cellular automation model MigClim. MaxEnt had higher AUC, pAUC and sensitivity scores (0.82/1.40/1.00) when compared to GARP (0.70/1.26/0.9), indicating better discrimination of suitable versus unsuitable areas for AGM. The models indicated that suitable conditions for AGM were present in the provinces of British Columbia, Ontario, Quebec, Nova Scotia and New Brunswick. The human influence index was the variable found to contribute the most in predicting the distribution of AGM. These model results can be used to identify areas at risk for this pest, to inform strategic and tactical pest management decisions.

Agroclimatic Conditions for Growing Sorghum bicolor L. Moench, under Irrigation Conditions in Mexico

Faced with the possible depletion of fossil fuels and the growing demand for energy; the liquid biofuels are being considered as a renewable energy alternative with low impact on carbon emissions. Sweet sorghum (Sorghum bicolor (L) Moench) is a good alternative as it has several advantages in relation to other plant species. Given the interest of the Mexican Government to promote biofuels and S. bicolor in particular, this work aimed to spatially delimit the optimal and suboptimal areas to produce this crop in Mexico. The database information considered was the crop agro-ecological requirements for optimal production under irrigation conditions. To process and analyze the information, the QGIS version 3.6 software was used. In high potential areas all variables interact favorably for best crop development and in the suboptimal ones both climatic and edaphological factors interact properly with some limitations; in the unsuitable areas all factors are constraining ones. The study quantified more than 19 million hectares with high optimal conditions under irrigation conditions. The states with the largest areas to produce sweet sorghum are: Veracruz, Campeche, Tamaulipas, Tabasco, Guanajuato, Sonora, Sinaloa, Nuevo Leon, Michoacan, Chihuahua and Quintana Roo; however, should water is provided, practically, it can be grown in all the states of the country.

Settlement development based on land suitability

The needs of settlements land are higher due to the increasing population, but the lands-availability in urban areas is getting narrower. Land use continues to grow as the initial process for the expansion of the city, its movement will out from the city centre to the periphery. Therefore, it is necessary to study the suitability land and develop the principles of the location planning of housing development. The research method using analytical hierarchy process (AHP) to calculate the weights, Geographical Information System (GIS) was used to create land suitability map, and overlay analysis result used to describe the principle of settlement location based on land suitability. The results show that 1) most suitable land for housing development is 637,75 hectare, low suitable land is 952,75 hectares and unsuitable areas of 781.5 hectares 2)The principles of settlement location based on land suitability are a)Clean water, available piped water network with adequate water quality terms smells, taste and colour, b)Flood prone, integrated drainage system development, optimization of reservoir performance and lake as water absorption, c)Accessibility, have road infrastructure and easy access to public transportation, d) Availability of land, not located in protected areas or technical irrigation, e) Availability of basic public service.

ASSESSMENT OF ECOLOGICAL POWER FOR LOCATING TOURIST VILLAGES

Eco-tourism is a purpose-oriented nature trip to understand the natural and cultural history of the environment by avoiding the change any ecosystems. Degradation of the environment and the creation of economic activities that lead to the proper exploitation of environmental resources and employment for indigenous people. Assessing the power of Lighvan-e Chai and Saeid Abadi watersheds for eco-tourism development is a major step taken in the sustainable development in the region. The present paper aims to assess the eco-tourism potential of the area using the ANP process and Geographic studies system (GIS). Based on the results of the eco-tourism capability map, %1.42 of the high level in the study area is 7.11% of the good level. Also, the results of this study showed that the most unsuitable areas for the construction of high-rise tourist villages were identified. More than 55% of the total range is included.

Analysis of land suitability, carrying capacity, and development strategies for seaweed cultivation in Labakkang District, Pangkep Regency, Indonesia

Analysis of land, its carrying capacity and development strategy of seaweed cultivation in Labakkang, Pangkajene Regency. This study attempts to: (1) analyze the suitability of coastal land that appropriate for seaweed cultivation, (2) determine the carrying capacity of the land for seaweed cultivation, (3) formulate strategies and policies that appropriate for seaweed cultivation. This study used biophysical field survey to assess the region, analyze the suitability of the land as well as the carrying capacity of the area by using a geographic information system. Furthermore, the research analyzed the strategy and policy of development of seaweed cultivation with A'WOT analysis approach. The results of the evaluation of the suitability of land for seaweed cultivation in coastal areas showed that Labakkang has potential approximately 1632.876 ha. The area is suitable for seaweed cultivation activities around 1035.54 ha, and unsuitable area around 597.336 ha. For carrying capacity of seaweed cultivation in the coastal area of Labakkang is for 40.55 units. The priority development strategy of seaweed cultivation is strengthening institutions to make a sustainable seaweed cultivation in Labakkang.

Modelling Climate Suitability for Rainfed Maize Cultivation in Kenya Using a Maximum Entropy (MaxENT) Approach

Climate change and variability are projected to alter the geographic suitability of lands for crop cultivation. In many developing countries, such as Kenya, information on the mean changes in climate is limited. Therefore, in this study, we model the current and future changes in areas suitable for rainfed maize production in the country using a maximum entropy (MaxENT) model. Maize is by far a major staple food crop in Kenya. We used maize occurrence location data and bioclimatic variables for two climatic scenarios-Representative Concentration Pathways (RCP) 4.5 and 8.5 from two general circulation models (HadGEM2-ES and CCSM4) for 2070. The study identified the annual mean temperature, annual precipitation and the mean temperature of the wettest quarter as the major variables that affect the distribution of maize. Simulation results indicate an average increase of unsuitable areas of between 1.9–3.9% and a decrease of moderately suitable areas of 14.6–17.5%. The change in the suitable areas is an increase of between 17–20% and in highly suitable areas of 9.6% under the climatic scenarios. The findings of this study are of utmost importance to the country as they present an opportunity for policy makers to develop appropriate adaptation and mitigation strategies required to sustain maize production under future climates.

Determination of suitable locations for the construction of gas power plant using multicriteria decision and Dempster–Shafer model in GIS

ABSTRACT With the growth of the population, the development of industrial, agricultural and so on, the amount of gas demand has been increasing steadily. Supplying the required gas energy often involves the construction of new power plants. The construction of power plants has social, economic, political and environmental consequences. Given the impact of power plant location in the cost of production and transmission of energy, environment, and so on, the importance of selecting the right place for the construction of the power plant is obvious. Therefore, in this study, geographical information system (GIS) based fuzzy-analytic hierarchy process (AHP) as one of the multicriteria decision methods and Dempster–Shafer theory (DST) methods are used to determine suitable locations for construction of gas power plant in Esfahan province, southwest of Iran. Different layers including distance to pipeline, distance to road, lithology, distance to stream, elevation, slope, and land use are prepared using ArcGIS. Subsequently, the importance of each factor in determining gas power plant location is defined using membership function. In the fuzzy-AHP method, membership function fuzzy maps for each layer are prepared. The DST model in Matlab is also used. The method was applied with three levels of confidence 99.5%, 99%, and 95% with the results compare. The results with the fuzzy method showed that 9.57% of the study area is unsuitable for the gas power location. On the hand, the results of the DST model showed that unsuitable areas for the DST method occupy 10.36%, 13.01%, and 19.55% of study area for levels of confidence of 95%, 99%, and 99.5%, respectively.

Spatial distribution of flow currents and habitats in artificial buffer zones for ecosystem-based coastal engineering

As the process of urbanization progresses, coastal engineering are posing serious threat to the local ecosystems. The poorly designed coastal engineering will have irreversible effects on local ecosystems, such as the biodiversity declination, the connectivity destruction and the ecosystems deterioration. Therefore, it is very necessary to improve the concept of ecosystem-based coastal engineering design. In strict accordance with the notion of eco-seawall, in this research, the hydrodynamic change in 20 engineering scenarios was discussed and determined the spatial distribution of suitable habitats for aquatic species, which defined as the niche of aquatic organisms in the dimension of hydrodynamic. This research was conducted by carrying out pilot-scale experiment with an aim to enhance the traditional coastal engineering in terms of (a) measuring the intensity of hydrodynamic variations by adding artificial beach or buffer zone (b) determining the overtopping risks in varying working conditions (c) visualizing the distribution of optimal habitat areas with hydrodynamic parameters as eco-niche dimension. As revealed by the results, four working conditions pose low overtopping risk and exhibit uniform distribution of flow (No.1, No.2, No.8 and No.14). Additionally, the suitable habitats distribution have been visualized for 4 types of working condition with safety structure. A conclusion can be drawn that there are significantly fewer unsuitable habitat areas in the No.14 scenario as compared to other schemes. In general, this research is conducive to improving the development of ecosystem-based coastal engineering.

ARAHAN KEBIJAKAN PENGGUNAAN LAHAN PERMUKIMAN BERBASIS BENCANA TSUNAMI DI KABUPATEN PESISIR SELATAN

This research begins from phenomena of the tsunami disaster that could potentially occur in Kabupaten Pesisir Selatan. This study aimed to analyze the suitability of land for settlements in the zone are not at risk of tsunami and settlement development policy directives based tsunami. This research classified as descriptive and used a survey method. The mapping unit used is a unit of landforms. units in research area was varied so that sample technique used here was stratified random sampling. The research showing that residential suitability in Kabupaten Pesisir Selatan divide into two areas, its : suitable area for settlement (4007,225 km) and unsuitable area for settlement (1742,665 km). The suitable area based on tsunami there are four areas, its (i) Settlements with moderate risk of tsunami (946,036 km), (ii) Settlements with low risk tsunami (3061,189 km), (iii) Unsuitability settlements with moderate risk tsunami (838,710 km), (iv)Unsuitability settlements with low risk tsunami (903,954 km). Policy directives use for settlements based on tsunami disaster with priority by four alternative policy its : a. tsunami disaster mitigation through the construction of shelters and evacuation route, b. Knowing risk zone tsunami for early warning system, c. relocation of settlements gradually to people who live in areas at risk of tsunami, d. preparing land designated for residential area-based tsunami.

Population analysis reveals genetic structure of an invasive agricultural thrips pest related to invasion of greenhouses and suitable climatic space.

Biological invasions of pests into climatically unsuitable areas can be facilitated by human‐regulated environments, in which case there may be an impact on genetic structure through population processes and/or adaptation. Here, we investigated the population genetic structure of an invasive agricultural pest, Thrips palmi, in China, which has expanded its distribution range through using greenhouses. Early invaded populations showed a relatively higher level of genetic diversity than recently expanded greenhouse populations. Strong population genetic structure corresponded to a pattern of isolation by distance, with no recent gene flow and low historical gene flow among populations, reflecting limited ongoing dispersal. A genetic signature of population expansion was detected in early invaded populations and three northern populations from greenhouses, suggesting that the greenhouse environments facilitated expansion of this species. Redundancy analysis showed that the independent effects of environment and geography could explain 51.68% and 32.06% of the genetic variance, respectively. These findings point to climate‐ and greenhouse‐related spatial expansion, with the potential for adaptation by T. palmi. They emphasize the contribution of human‐regulated environments on the successes of this invasive species, a situation likely to apply to other invasive species that use greenhouse environments.

Land Suitability and Availability Evaluation for Shallot Farming Development in Brebes Regency, Central Java

Land suitability and availability is needed to be evaluated in Brebes Regency because the utilization of unsuitable land area is increasing to pursue high production targets as the impact of increased shallot demand. The objective of this research was to evaluate the land suitability and land availability for shallot farming development in Brebes Regency, an agricultural regency in Java island. The method used was the matching method between shallot growing pre-requirement criteria from Indonesian Center for Agricultural Land Resources Research and Development (CALRRD) with land quality and characteristics in Brebes Regency. Since limited data, we used an interpolation techniques from 14 sample point by using geostatistical wizard tool in ArcGIS 10.3 with inverse distance weighting (IDW) method for nutrient retention and climatologicaldata, while soil physical propertiesfrom soil map atribut data ekstraction, meanwhile terain data were constructed from digital topographic maps (countur line). The result indicated that suitable land for shallot farming development was 29.3% or 50,440.7 hectares included in the Moderately Suitable (S2); 55.5% or 95,819.9 hectares in Marginally Suitable (S3); while Not Suitable (N) was 14.8% or 25,678.3 hectares. The available land for agricultural farming based on legality was 59,076.0 hectares (without considering the existing shallot farming), while the suitable land area on available land was 56,642.6 hectares. The existing shallot land area was 49,840,3 hectares, so the available and suitable land area on existing land for shallot farming was 49.099,5 hectares, and potential extensification was 6.417,9 hectares as shrubs, grasslands, open land, and forest. The huge potential extensification area was Salem, Bantarkawung and Ketanggungan Sub-districts, it means that those area have an opportunity and potency for agricultural extensification program development for shallot commodities in Brebes Regency in order to enhance the national shallot productivity and food security. Land suitability and availability is needed to be evaluated in Brebes Regency because the utilization of unsuitable land area is increasing to pursue high production targets as the impact of increased shallot demand. The objective of this research was to evaluate the land suitability and land availability for shallot farming development in Brebes Regency, an agricultural regency in Java island. The method used was the matching method between shallot growing pre-requirement criteria from Indonesian Center for Agricultural Land Resources Research and Development (CALRRD) with land quality and characteristics in Brebes Regency. Since limited data, we used an interpolation techniques from 14 sample point by using geostatistical wizard tool in ArcGIS 10.3 with inverse distance weighting (IDW) method for nutrient retention and climatologicaldata, while soil physical propertiesfrom soil map atribut data ekstraction, meanwhile terain data were constructed from digital topographic maps (countur line). The result indicated that suitable land for shallot farming development was 29.3% or 50,440.7 hectares included in the Moderately Suitable (S2); 55.5% or 95,819.9 hectares in Marginally Suitable (S3); while Not Suitable (N) was 14.8% or 25,678.3 hectares. The available land for agricultural farming based on legality was 59,076.0 hectares (without considering the existing shallot farming), while the suitable land area on available land was 56,642.6 hectares. The existing shallot land area was 49,840,3 hectares, so the available and suitable land area on existing land for shallot farming was 49.099,5 hectares, and potential extensification was 6.417,9 hectares as shrubs, grasslands, open land, and forest. The huge potential extensification area was Salem, Bantarkawung and Ketanggungan Sub-districts, it means that those area have an opportunity and potency for agricultural extensification program development for shallot commodities in Brebes Regency in order to enhance the national shallot productivity and food security.