Location Determination of Salatiga City Park Potential with Geographic Information System

Based on Salatiga Urban Land Use Plan 2010-2030, Salatiga still having lacked 30% of the green open space from its area. The addition of the city park is one of the green open space planning that can support the lack, so the research about Salatiga city park location determination with Geographic Information System (GIS) was as one part of the planning of the city park addition. The purpose of the study is ideal location determine for the city park in Salatiga which it was based on population density, population preferences and city park manager, land characteristics, and government regulation about the green open space. The research method was used the descriptive method through quantitative and qualitative approach by utilizing GIS software, questionnaire, and an interview. The research result showed the city park can be developed in protected areas (especially in urban forest sites) or in cultivation areas. However, the city park development must be in accordance with government regulations, land character and land suitability requirements for the city parks. Potential locations for urban parks in Salatiga city can be distinguished by two categories: 1. Recommended class area with 944,584 ha (16.64% of total area) and 2) Highly Recommended class area with 123.37 ha (2.17% of total area).

1. Play lots, a park capable of serving 300-700 residents with the size of 150-1500 m2 2. Vestpocket park, parks capable of serving 500-2500 residents with the size of 750-5000 m2 3. Neighborhood park, parks capable of serving 2000-10000 people with a size of 1-8 ha 4. District/urban park, the park is able to serve 50000 inhabitants, is a city park, with the size of 8-80 ha 5. Large urban park/regional space, parks capable of serving residents in 2 cities or more with an area of 40-400 ha.
The city park is one of the most important forms of a park for the city inhabitant.The city park is parks located in city environments on a wide scale, used by the people to act at any time without having to pay the costs and can anticipate the impact of city development [5].Based on Salatiga the Urban Land Use Plan 2010-2030 [8], Salatiga still having lacks of 30% of the green open space from its area, 5.678,11 hectares and the government of Salatiga try to fill the lack with several types of the green open space.This refers to the Regulation of Ministry Public Work No.05/PRT/M/2008 [10] that the proportion of green open space in urban areas should be 30% of the total area consisting of 20% of public open space and 10% private space.One type of green open space used by the government of Salatiga city to meet the needs of green space is by the addition of the city park.The addition of the city park is needed one of them to fulfill the function of environmental conservation as urban lungs in urban decay as well as control and reduction of air pollution, dust or particles consisting of several components of pollutants.
The city park addition would require a review of urban park planning because in a plan cannot be done indiscriminately considering one of them in order to avoid waste in development or minimize the uncertainty of errors in the development of the city park.One of the city park plans that need to be done is the determination of the location of the garden city itself.Park location determination can be based T on land suitability with the physical performance of the land, available land area and population density that meets the land and preferences of various parties from the users and the city park managers for proper location determination especially in terms of accessibility.
The land characteristic is important factors for a specific land use such as the city park.The land characteristic properties that are soils type, slope, air temperature, precipitation, altitude.Demography can determine the city park types, this is related to determining the type and location of the park city [6].Increasing a population will increase needs for open space and preferences the city park types.Preference is part of the decision-making component of an individual in determining the various options for his needs.Thus, the determination of the city park location is based not only on the assessment of the land characteristic and demographic analysis but the preferences of both the users and the city park management also influence.The location of the park is usually in a strategic location and easily accessible from various corners of the city [1].
GIS is a computer-based system that merges geographic locations with statistical analysis and database technology.GIS allows planners and researchers to combine and analyze statistical information with its geographical representation [13].Based on background mentioned above, it was conducted research about location determination of Salatiga city park potential with geographic information system.

Stages of research implementation
The research was conducted in Salatiga, Central Java, Indonesia, which was held in June 2017.The analyzer was used is software ArcGIS 10.3.The research type is descriptive quantitative research was used survey method to the respondents from 3 Salatiga city park visitors, Salatiga city park managers, number of urban population and the land characteristics such as soils type, soil texture, gravel and stone surface, bedrock, slope, precipitation, altitude, hydrology (rivers and water springs), flooding hazard, city road.Respondents in this study were park users who were doing their activity in 3 the city park Salatiga with age above 12 years with a number of 90 persons.Survey location is Bendosari park, Tingkir park, and Pancasila square with 30 questionnaires for each location.Data were collected using closed questionnaire method with a focus of study based on criteria of preferences about the city park ideal and new located determines of the city park.

Determination of cultivation area or protected area
Based on the Regulation of Minister of Public Works No.41 / PRT / M / 2007 [11] to determine the cultivation or protected area, that following stages are used: 1. Determining factor of cultivation area or protected area is a slope, soil type according to their sensitivity to erosion and rain intensity.2. To establish a cultivated area or a protected area, the score value of factors such as slope, soil, rainfall intensity are summed.The total of score value of the factors (slope, soil, rainfall intensity) are ≥175 indicates that the area concerned is categorized as a protected, while the total score value of factors (slope, soil, rainfall intensity) < 175 is a cultivation area.

Determination of City park location
The city park location determination was based on land suitability for the city park [7] (Table 4), population density, and preference of user and manager of the city park.
The city park location determination was not only based on land suitability but also must consider the preferences of urban people as park users, preferences of city park managers as the park management authority and people population densities that will determine the land availability.

City inhabitant population density, preference of the city inhabitant and the Salatiga city park manager
The total inhabitant population of Salatiga City in 2016 is 186,316 people.Kelurahan (Village) with the highest population density is Kelurahan Gendongan which reached 778 souls / km2 and village with the lowest population density is Kelurahan Kalibening which reach 74 soul / km2.Population density in Salatiga City is divided into 4 class, which is very high density, high density, medium density and less dense.The cause of high population density in the city one of them caused by increased urbanization.High population density, will give effect to the urban space management.The city park development will be hampered in areas with high population density due to the open space absence.Therefore, the city parks development would always be directed to areas with low to moderate population density.The main factor to be considered in choosing a public park location is the social requirement to build the park [4].Therefore, the public preferences analysis on urban park development is very necessary.The preference survey result on inhabitant population and Salatiga city park manager were showed on the city park development in Salatiga as follows: 1. 77% of the inhabitant population use the city park for recreation and play 2. 66% of the inhabitant population wants a city park development to add to the city beauty 3. 96% of the inhabitant population wants a city park can provide visitors comfort 4. 61% of the inhabitant population wants the existing city park and to be built many elements of vegetation especially flowers and trees 5. 81% of the inhabitant population wants the city park located near the main road and is easily accessible The results of a preference survey of Salatiga city park managers show: 1.The city park will be developed in an area easily accessible and located near the main road.2. The city parks will be developed for city inhabitant that could be used for recreation, studying, playing, exercising and improving biodiversity.

Salatiga land characteristic
Salatiga is a city in Central Java, Indonesia with 4 subdistricts, which 4 sub-districts have 22 urban villages.Salatiga has an area of ± 56,78 km ² and according to the Central Bureau of Statistics (2015), Salatiga city has a population of 183,815 inhabitants.Salatiga city is located at an altitude of 450 -800 m above sea level, where 67.05% of total area has a slope of 0% -8%, 24.04% of total area has a slope of 8% -15%, 4% of total area has a slope of 15 -25% and the rest with slopes> 25% Precipitation data from 2011 to 2015, Salatiga's precipitation type has an average annual rainfall of 2,124 mm per year with a daily rain intensity of 25.29 mm per day.Based on the precipitation characteristics, the Salatiga city has a precipitation on the moderate class.Salatiga city was dominated by Latosol soil its covers 71.14% of land area, Alluvial soil covers 13.89% of land area, Latosol-Andosol soil associations cover 10.71% of land area and Andosol soil covers 4.32% of land area.Latosol is the soil with a consistency of loose soil and crumbling soil structures, infiltration and percolation velocities from moderate to moderately slow, water retention is good enough and somewhat sensitive to erosion, while the Alluvial soil is not sensitive to erosion and Andosol is a sensitive soil erosion.
Based on the soil physical properties, the soil texture group ranges between consisting of coarse, moderately coarse and moderately, with a soil that has a gravel of <15%, a stone of <3% and a rock that does not exist on the soil surface.Salatiga city has the well-drained conditions and there is never of flooding hazard. .[11] and Salatiga city land characteristic then the Salatiga city about 75.56% of total area is a cultivation area and 24.44% of total area is a protected area.
. Figure 5. Cultivation and protected are in Salatiga city

Land suitability for the city park potential location in Salatiga city area
The city park can be developed in protected areas (especially in urban forest sites) or in cultivation areas.However, the city park development must be in accordance with government regulations, land character and land suitability requirements for the city parks.Government regulation for the city park development was based on the Regulation of Minister of Public Works No 05/PRT/M/2008 on Guidelines for the Provision and Use of Green Open Space in Urban Areas [10], that the city park is located in the area with following conditions: 1. Open space at the city level 2. The spatial analysis shall be appropriate to the level or class of land suitability for the city parks and regulation in The Urban Land Use Plans.3. Minimal 100 meters from either side of a large river or 50 meters from both sides of a small river.4. Minimum 200 meters from the water spring center.
GIS analysis was based on Salatiga land characteristic, land suitability for the city parks, Salatiga Urban Land Use Plans 2011-2030 [8] and the Regulation of Minister of Public Works No 05/PRT/M/2008 [10], that Salatiga can be categorized into 4 classes of the city park development area: 1.The first area is the class that is not recommended for the construction of the city park. 2. The second area is a class that is quite recommended for the construction of the city park. 3. The third area is the recommended class for the city park. 4. The fourth area is a highly recommended class for the city park.
Recommendations potential location for the city park development were undertaken in areas with land suitability classes the highly recommended (dark green) and the recommended (green) (Fig 6 ).

IV. CONCLUSIONS
The potential location of city park development can be developed in protected areas (especially in urban forest sites) or in cultivation areas.However, the city park development must be in accordance with government regulations, land character and land suitability requirements for the city parks.Potential locations for urban parks in Salatiga city can be distinguished by two categories: 1. Recommended class area with 944,58 ha (16.64% of total area) and 2) Highly Recommended class area with 123.37 ha (2.17% of total area).

Figure 1 .
Figure 1.Flowchart of location determination of salatiga city park potential with GIS

Figure 2 .
Figure 2. People density in Salatiga city

Figure 4 .
Figure 4. Soil type and texture group in Salatiga city

Figure 6 .
Figure 6.Recommendation potential location for the city park in Salatiga city

Table 1 .
Slope classes score

Table 2 .
Soil type classes score

Table 3 .
Rain intensity classes score

Table 4 .
Land suitability criteria for the city park

Table 5 .
The diversity of slopes in Salatiga City

Table 8 .
Land classification category for the city park in Salatiga City

Table 9 .
Land classification for the potential location of city park development of each village in Salatiga city