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A methodological approach to urban land-use change modeling using infill development pattern—a case study in Tabriz, Iran



In recent years, models of land-use change and urban growth have become important tools for city planners, economists, ecologists, and resource managers. In most models, future land-use changes are forecasted based on past development pattern and expansion to periphery. While today, metropolitan areas employ smart-growth strategies. The main objectives in this study are according to the smart-growth infill. In this approach, transmission of incompatible land uses to the outside of the city boundary, redevelopment, improvement, and renovation of urban old district and worn-out texture and reuse of abandoned land to new urban development are considered. In fact, the objective is the using of the infill development pattern to modeling approach for simulating urban future development using potentials inside the city.


This paper presents a Land Transformation Model of urban land-use change based on an artificial neural network and a geographical information system. For developing this approach, future development of Tabriz city based on past development trend and infill development pattern is modeled.


The modeling result based on past development pattern shows that the 31.26 % of green spaces and 60.93 % of agricultural land and wasteland will be destroyed and the built area will increase 89.75 % from 2005 to 2021. Development of infill development pattern model can regularize urban expansion in the coming decades. The result of infill development pattern, show that the built area will increase 40.32 percent and agricultural land and wasteland area decrease 32.67 percent until 2021.


In fact, redevelopment of urban land uses in infill development pattern until 2021, not only preserve the green spaces and agricultural areas but also improve and rehabilitate old and worn-out textures.


Cities have developed rapidly since the Industrial Revolution, expanding worldwide in conjunction with socioeconomic development. However, the rapid growth of urban areas has led to complex problems, including traffic congestion, environmental pollution, reduced open space, the deterioration of old downtown centers, and unplanned or poorly planned land development (Lee, 2008). To address these urban problems and to identify approaches for sustainable development, many researchers have focused on developing urban land-use change-prediction models. These land-use change models identify the best coefficient for predicting growth and land-use changes until the present using data from the past to the present as input for predicting urban land-use change (Jeong et al., 2002).

Models of land-use change, which couple biophysical and socioeconomic drivers, are needed to address the complex issue of land-use change and build up sustainable land-use practices and policies (Van Daalen et al., 2002; Lambin and Geist, 2006). Many models have been developed to simulate the outcomes of land-use decisions and support the analysis and understanding of land-use practices (Verburg et al., 2004). A variety of methods have been used to develop land-use models including those using statistical (Veldkamp and Fresco, 1996), machine learning (e.g., Pijanowski et al. 2002), agent-based (Parker et al., 2003; Alexandridis and Pijanowski, 2007; Matthews et al., 2007), or simple rule-based approaches (Pontius, 2002).

One of the main challenges in spatial planning and development pattern in the 21st century is urban sprawl. Urban sprawl is defined as a specific form of urban development with low-density, dispersed, auto-dependent, and environmentally and socially impacting characteristics (Hasse and Lathrop 2003). The consequences and negative implications of this type of urban development include increased traffic and demand for mobility (Ewing et al., 2002; Cameron et al., 2004; Kahn, 2000), land-use fragmentation and loss of biodiversity (Alberti, 2005), reduced attractive landscape (Sullivan and Lovell 2006), and alterations of the hydrological cycle and flooding regimes (Bronstert et al., 2002; Carlson, 2004; McCuen, 2003). While today, Metropolitan areas employing smart-growth strategies reap several benefits: the regional economy is strengthened, residents’ quality of life is enhanced, and outer-area natural resource systems are protected and restored (Burchell et al. 1998). Infill development is a key component of smart growth. Infill development is the process of developing vacant or under-used parcels within existing urban areas that are already largely developed. Most communities have significant vacant land within city limits, which, for various reasons, has been passed over in the normal course of urbanization. A successful infill development program focuses on the completion of the existing community fabric. It should focus on filling gaps in the existing urban areas (Municipal Research & Services Center of Washington, 1997).

This study modeled Tabriz future development by applying the infill development approach, and it extended to include two time series satellite imageries from 1989 to 2005 and eight other variables for evaluation of Tabriz expansion. So, the objectives of the present study are as follows:

  • To detect and evaluate the land-use and land-cover change due to urban expansion between 1989 and 2005

  • To answer the question what is the land-use situation in 2021

  • To analyze Land Transformation Model (LTM) based on past development trend (PDP) and infill development pattern (IDP) in future development, and

  • To evaluate the main infill development potentials for Tabriz future development

Study area

Tabriz is a city in the northwest of Iran (Fig. 1) and the capital of East Azerbaijan province; it is the fourth largest city in Iran and situated at an altitude of 1350 m at the junction of the Quri River and Aji River; it was the second largest city in Iran until the late 1960s, one of its former capitals, and residence of the crown prince under the Qajar dynasty. Tabriz is located in a valley to the north of the long ridge of the volcanic cone of Sahand Mountain, south of the Eynali mountain range. The valley opens out into a plain that slopes gently down to the northern end of Lake Urmia, 60 km to the west. Like other populated cities in developing world, Tabriz has experienced the phenomenon of rapid urban growth leading to the formation of informal and slum settlements in peripheral zones of the city. During the recent decades, the city has undergone an irregular and rapid growth and has experienced incredible population and spatial change. This city has always been considered to be one of the major political, cultural, and economic poles of Iran, a unique position making the city much more vulnerable to problems arising from unplanned urban growth (Moosavi, 2011).

Fig. 1
figure 1

The study area map (author’s illustration)


Land Transformation Model (LTM)

In recent years, models of land-use change and urban growth have become important tools for city planners, economists, ecologists, and resource managers (Agarwal et al. 2000; EPA, 2000; Klosterman, 1999; Wegener, 1994). This development was mainly driven by an increased availability and usability of multiple spatial datasets and tools for their processing. The Land Transformation Model (LTM) (Pijanowski et al. 2000) has been developed to simulate land-use change in a variety of locations around the world. The LTM uses population growth, transportation factors, proximity, or density of important landscape features such as rivers, lakes, recreational sites, and high-quality vantage points as inputs to model land-use change. The model relies on geographic information systems (GIS), artificial neural network (ANN) routines, remote sensing, and customized geospatial tools and can be used to help understand what factors are most important to land-use change. Information derived from a historical analysis of land-use change can be used to conduct forecasting studies. Land-use data from remote sensing is used for model inputs and calibration routines (Pijanowski et al. 2002).

LTM is employed to project the land-use change in this study. The model is a computer application and it mainly follows four sequential steps: (1) processing/coding of data to create spatial layers of predictor variables; (2) applying spatial rules that relate predictor variables to land-use transitions for each location in an area (the result and layers contain input variable values in grid format); (3) integrating all input grids using one of the three techniques, including multicriteria evaluation, ANNs, and logistic regression; and (4) temporally scaling the amount of transitions in the study area in order to create a time series of possible future land uses (Pijanowski et al., 2000).

Artificial neural network (ANN)

ANN models are computer programs that are designed to emulate human information processing capabilities such as knowledge processing, speech, prediction, classifications, pattern recognition, and control. The ability of ANN systems to spontaneously learn from examples, “reason” over inexact and fuzzy data, and to provide adequate and rapid responses to new information not previously stored in memory has generated increasing acceptance for this technology in various engineering fields and, when applied, has demonstrated remarkable success (Abdul-Wahab et al., 2002). The major building block for any ANN architecture is the processing element or neuron. These neurons are located in one of the three types of layers: the input layer, the hidden layer, and the output layer. First, the input neurons receive data from the outside environment. Then, the hidden neurons receive signals from all of the neurons in the preceding layer. Finally, the output neurons send information back to the external environment. The general procedure for the ANN simulation includes the following steps:

  1. 1.

    Representation of input and output vectors.

  2. 2.

    Representation of the transfer function.

  3. 3.

    Selection of the network structure.

  4. 4.

    Selection of the random weights.

  5. 5.

    Selection of the learning procedure.

  6. 6.

    Presentation of the test pattern and prediction or validation set of data for generalization (Rahimi, 2005). Multilayer perceptron (MLP) is a feed-forward layered network with one input layer, one output layer, and some hidden layers. Figure 2 shows a MLP with one hidden layer. The task of every node is computed a weight for the sum of its inputs and is passed through a soft nonlinear function. This soft nonlinear or activity function of neurons should be decreased and different (Vakil-Baghmisheh, 2003).

    Fig. 2
    figure 2

    The structure of a three-layer MLP (author’s illustration)

Data preparation

Before land-cover classification, a three-class classification system was designed with consideration of the land-use properties of the study area as urban/built-up, green spaces, and agricultural and wasteland areas. The widely used supervised classification method, maximum likelihood (Murai, 1996), was employed to detect the land-cover types. The maximum likelihood (ML) method, a common method in remote sensing owing to its robustness, was implemented to classify the images. The ML procedure is a supervised statistical approach to pattern recognition. It estimates the probability of a pixel belonging to each of a predefined set of classes and then assigns each pixel to the class with the highest probability.

The initial (1989) Landsat 5 (3, 4, and 5 bands) and final (2005) SPOT 5 (1, 2, and 3 bands) satellite images of Tabriz city were subjected to a classification of zones. To prepare data for analysis and modeling, the two land-use vector datasets (multitemporal Landsat thematic mapper (TM) in 1989 and SPOT data in 2005) were rasterized (a grid of cells was created from polygons of land-use/cover patches). For classification of satellite image, ERDAS IMAGINE 10 software is used. Firstly, geometric correlation and georeferencing of images are developed. Finally, images were classified. Along with the two time steps of land use for the city, we used vector data for roads, hospitals, educational, parks, worn-out tissues, population density, directions of development in master and regional plans and the proposed urban development direction by local governments, and raster data for elevation and produced slope map (Fig. 3 and Table 1). Using the spatial analyzing tool in ArcGIS, we evaluated data for modeling urban land-use change in LTM. The result of the classification is analyzed in ArcGIS 10 software, and final land-use maps for modeling are prepared. Necessary data for modeling in LTM are produced in grid format and converted to ASCII format in the spatial analyzing tools in ArcGIS software.

Fig. 3
figure 3

The map data for modeling (author’s illustration)

Table 1 LTM model parameters

After preparation of data in ASCII format, in the first step, ANN is trained using input variables, output variable (land use map 2005), and exclusionary map. In this research, we used an ANN with nine input layers, nine hidden layers (like the input layer), and one output layer (Fig. 4). In the second step, ANN was tested using variables in the last step and a real change map that was produced in the training step.

Fig. 4
figure 4

The structure of a three-layer (input, hidden, and output layers) ANN in this research (author’s illustration)

In the forecasting step, a transformation cell number (TCN) is calculated based on the value on the population growth and per capita land-use requirements using follow functions:

$$ \mathrm{T}\mathrm{C}\mathrm{N}=\frac{P_i\times {L}_p}{C} $$
$$ \mathrm{T}\mathrm{C}\mathrm{N}=\frac{\left({P}_i+{P}_w\right)\times {L}_p}{C} $$

Where TCN is the amount of new urban land for future development (number of new cells for future development), P i is the number of new people from 2005 until 2021, P w is the number of worn-out tissue dwellers, L p is the per capita requirements for urban land use, and C is the area per cell. For calculation of TCN based on PDP and IDP models, we used functions (1) and (2), respectively. In this paper, we used estimated population growth and per capita requirements based on the estimates of the master plan and regional plan of Tabriz.

In this step, an exclusionary map based on PDP is produced with permissible and impermissible layers. Built areas in 2005, parks, military barracks, protected lands, and lands dedicated for the stadium are the exclusionary cells in this paper. But in LTM based on the IDP model, we developed the exclusionary map with potential cells for future development.

For assessment of the simulation and prediction process, root mean square (RMS), percent correct metric (PCM), and kappa coefficient were calculated from the following equations:

$$ \mathrm{R}\mathrm{M}\mathrm{S}={\left\{\frac{1}{N}{\displaystyle \sum_{i-1}^N}\Big({p}_{i-}{o}_i\right\}}^{1/2} $$

RMS = root mean square

o i = original data

p i = predicted data

$$ \mathrm{P}\mathrm{C}\mathrm{M}=\frac{\mathrm{TP}}{\mathrm{TCN}}*100 $$

PCM = percent correct metric

TP (real change and predicted change) = true positive

TCN = transition cell number

$$ \mathrm{Kappa}=\frac{\left(\left(\frac{\mathrm{TN}}{\mathrm{GT}}\right)+\left(\frac{\mathrm{TP}}{\mathrm{GT}}\right)\right)-\left(\left(\left(\frac{\mathrm{SN}}{\mathrm{GT}}\right)\cdot \left(\frac{\mathrm{RN}}{\mathrm{GT}}\right)\right)+\left(\left(\frac{\mathrm{SP}}{\mathrm{GT}}\right)\cdot \left(\frac{\mathrm{RP}}{\mathrm{GT}}\right)\right)\right)}{1-\left(\left(\left(\frac{\mathrm{SN}}{\mathrm{GT}}\right)\cdot \left(\frac{\mathrm{RN}}{\mathrm{GT}}\right)\right)+\left(\left(\frac{\mathrm{SP}}{\mathrm{GT}}\right)\cdot \left(\frac{\mathrm{RP}}{\mathrm{GT}}\right)\right)\right)} $$





True negative

No change in both real and simulated


True positive

Change in both real and simulated


False negative

Change in real but not in simulated


False positive

Change in simulated but not in real


Simulated negative

Total no change in simulated


Simulated positive

Total change in simulated


Real negative

Total no change in real


Real positive

Total change in real


Grand total

Total cells transitioned


Evaluation of past urban land transformation of Tabriz

Results for two time series from satellite images confirmed land use change in Tabriz city. In a 16-year difference of images (from 1989 to 2005), the built area changed 107 % and from 4541 ha in 1989 increased to 9400 ha in 2005 (Figs. 5 and 6). While the population of Tabriz in 1989 to 2005 increased from 1.039 to 1.4 million people. The increased population in this period was around 360,000 people, and the change rate of population was 34 % approximately. Therefore, the increase of both population and built areas was not adaptive together, and this result shows that Tabriz has increasingly been faced with a sprawl growth. Also, the unsuitable development program caused 20 % of green space of Tabriz to be demolished in this period. The green space areas reduced from 5475 to 4373 ha, and agricultural lands changed from 15000 to 11000 ha (Table 2). Therefore, 1100 ha in green space and 3700 ha in agricultural lands were destroyed in 1989 to 2005. In this step, an exclusionary map based on PDP is produced with permissible and impermissible layers.

Fig. 5
figure 5

Land-cover map of Tabriz city in 1989 using TM data (author’s illustration)

Fig. 6
figure 6

Land-cover map of Tabriz city in 2005 using SPOT data (author’s illustration)

Table 2 Land-cover changes of Tabriz city during the 1989 to 2005

Modeling of urban expansion based on past development pattern (PDP)

Based on past development, a Land Transformation Model is developed for prediction of urban built area alteration. Typically, an ANN is trained to 250,000 cycles, but because of overtraining in this process, the ANN training process is stopped at 50,000 cycles in this research. The best result in RMS, PCM, and kappa coefficient was calculated at 10,000 cycles that were 0.132034, 64.670215, and 0.520152, respectively, and so, the optimum cycle in the test and simulation processes was selected at 10,000 cycles.

Result in the training step shows that 21,469 cells in 50 × 50 m (built area) were expanded from 1989 to 2005. For calculation of TCN in the PDP model, equation (1) is used. Based on the prediction of the Tabriz population and land use per capita in the master plan and regional plan of Tabriz in 2010, the population of Tabriz will increase to 2100,000 people until 2021 and the necessary per capita is 83.3 m2. Therefore, using these estimates in the prediction process, 22,484 cells (50 × 50) are used to produce the probability map (Fig. 7). Result of LTM in PDP shows that the rate of changes in the built area is 89.75 % and an increase from 9401.677 ha in 2005 to 17,839.4 ha in 2021. Green spaces and agricultural land and wasteland classes, with −31.26 and −60.93 % rates of changes, decrease 3006.6 and 4533.3 ha in 2021, respectively (Table 3).

Fig. 7
figure 7

The probability map in PDP model (author’s illustration)

Table 3 Land-cover changes of Tabriz city during the 2005 to 2021 in LTM based on PDP

As is shown in Fig. 7, the most probable development of Tabriz has expanded in the east and northeast like the past development trend. Therefore, in this development pattern, Tabriz will need to increase limit boundaries and change the land use of periphery in the coming decades.

Modeling urban expansion using infill development pattern (IDP)

In the IDP model, the first step is the identification and preparation of urban potential for future development. These potentials include:

  1. 1.

    Redevelopment of vacant and abandoned urban lands: abandoned and vacant lands are an opportunity for city development. Based on the urban land-use map of Tabriz in 2005, the area of abandoned and vacant lands are 1800 ha.

  2. 2.

    Reuse of unsuitable land uses: unsuitable land use in each city is different. In this paper, heavy and pollutant industrial centers, terminals, and military barracks are unsuitable land uses in Tabriz city that have covered 2100 ha of the urban areas. The transmission of these land uses to out of the city receives a great potential for urban development in the future.

  3. 3.

    Improvement and renovation of worn-out texture: The most areas of worn-out texture in Tabriz contain urban old tissue with low building density and abundant lands and buildings and those are the best potential for future development of Tabriz. Based on worn-out texture map, the areas of these tissues are 2500 ha and include 10 % of urban limit area in 2005. 

Based on calculation, the area potential for development is 6300 ha and 25,200 cells (50 × 50 m). For modeling, nine input layers, nine hidden layers, and one output layer like the previous model is used. In the forecasting process and in producing the exclusionary map, worn-out tissue, vacant and abandoned urban lands, and unsuitable land-use maps are coded as development potential and existing green spaces and lands with high potential for natural hazards are coded as development restriction areas.

As mentioned earlier, equation (2) was used for calculation of TCN for the IDP model. By calculation of the current population in the development potential area and the population predicted of Tabriz in the master plan and regional plan of Tabriz in 2010 and land use per capita, 35,332 cells 50 × 50 m for probable expansion until 2021 are necessary.

Result in Fig. 8 based on IDP shows that the most development of Tabriz will expand in development potential areas and some development is in the southeast of Tabriz and other areas. The rate of changes in agricultural land and wasteland class is −32.67 %, and the green space class that is coded as development restriction areas is unchanged (Table 4).

Fig. 8
figure 8

The probability map for IDP model (author’s illustration)

Table 4 Land-cover changes of Tabriz city during the 2005 to 2021 in LTM based on infill

Not only by using infill development pattern to prevent sprawl development, but also by improvement and renewal of inefficient texture, a urban dynamic is formed. 

Figure 9 shows the difference in land-use classes changing in the PDP and IDP models. In IDP model, the built area decreased and green spaces and agricultural land and wasteland area increased compared to the PDP model. The built class area in IDP is 1392 ha while the area in PDP is 17,839 ha. So, 26 % of built areas in IDP model, have decreased compared to the PDP model.Because of green space restriction in the IDP model, this land-use class area did not change. Whereas, in the PDP model, green space area decreased to 3006 ha. Development priority on existing tissues in the IDP model caused to reduce development pressure on agricultural land. In fact, in the IDP model, the development main priority is efficient use and redevelopment of existing tissues and refinement of urban land uses(Table 5). In fact, in the IDP model, the development main priority is efficient use and redevelopment of existing tissues and refinement of urban land uses.

Fig. 9
figure 9

Differences in model results (IDP and PDP models) (author’s illustration)

Table 5 Differences between models results

In the smart-growth and infill development pattern (IDP), protection of the periphery lands is visible. there are many potential for future development of Tabriz, such as worn-out texture and brownfield. Therefore, smart growth can prevent sprawl and reduce the costs of urban development. 


Why are urban land-use changes so important?

In recent decades, research on land-use/land-cover change has become an important aspect of global change, or global warming studies, since land-use/land-cover change is a major factor for global change because of its interactions with climate, ecosystem processes, biogeochemical cycles, biodiversity, and, even more important, human activities (L’opez et al., 2001; Aguilar et al., 2003). For this reason, land-use and land-cover change was, therefore, treated as one core joint project of the International Geosphere Biosphere Program (IGBP) and International Human Dimensions Program on Global Environmental Change (IHDP). In the last 10 years, much more attention has been paid to urban land-use/land-cover change because ecosystems in urban areas are strongly affected by human activities and have close relations with the life of almost half of the world’s population (Stow and Chen, 2002.) With the rapid growth of urban areas engaged in the process of further urbanization, urban land use and land cover (LULC) are always in dramatic flux, further changing terrestrial biological, physical, and meteorological processes, leading to severe ecological and environmental problems (Pejun et al., 2010).

Urban development patterns and challenges

Current urban land uses exhibit inefficient patterns that are of major concern for sustainable development (Leccese et al. 2000; Silberstein and Maser 2000). Low residential densities, sprawl and leapfrog fragmentation of urbanization, rapid open space development at the urban edge without considering the redevelopment of declining inner cities, and patches of single land use all dominate the current urban form (Galster et al. 2001). Such trends lead to an increasing ethnic and economic separation, deterioration of the environment, loss of agricultural land and wilderness, and the erosion of society’s architectural heritage (Leccese et al. 2000). Research suggests that up to 70 % of the consumed energy is dependent on land-use arrangements (Barton 1990). In consequence, the importance of sustainable land-use allocation cannot be underestimated. The ability to understand and predict changes in land-use patterns is necessary for policymakers concerned with a variety of public finance, quality of life, and environmental protection issues. Changes in land-use patterns affect both human and natural systems. Potential social and economic impacts of changes in land-use patterns include increased costs of providing public services, loss of open space, and increased congestion. Potential ecological impacts include loss of habitat, fragmentation of habitat, and alteration of the hydrological regime (Bell and Irwin, 2002).

Urban land-use change modeling

Simulations of land-use change provide an important element in studies related to the preparation, development, and, to a lesser extent, evaluation of large-scale spatial plans and strategies. Recent surveys of operational models for land-use change are numerous. Briassoulis (2000) offers an extensive discussion of the most commonly used land-use change models and their theoretical backgrounds. Waddell and Ulfarson (2003) and Verburg et al. (2004) offer more concise overviews and focus on the future directions of research in this field. A cross-sectional overview of current progress on the analysis of land-use change processes, the exploration of new methods and theories, and the application of land-use simulation models are documented in a recent book by Koomen et al. (2007).

In recent years, the use of computer-based models of land-use change and urban growth has greatly increased, and they have the potential to become important tools in support of urban planning and management. This development was mainly driven by increased data resources, improved usability of multiple spatial datasets, and tools for their processing, as well as an increased acceptance of models in local collaborative decision-making environments (Klosterman, 1999; Sui, 1998; Wegener, 1994). However, the application and performance of urban models strongly depend on the quality and scope of the data available for parameterization, calibration, and validation, as well as the level of understanding built into the representation of the processes being modeled (Batty & Howes, 2001; Longley & Mesev, 2000). In recent years, models of land-use change and urban growth have become important tools for city planners, economists, ecologists, and resource managers (Agarwal, et al., 2000). This development was mainly driven by an increased availability and usability of multiple spatial datasets and tools for their processing (e.g., GIS). Community-based collaborative planning and consensus-building efforts in urban development have also been strengthened by the new data and tools at the local level (Herold et al., 2005).

Smart growths and infill development

Municipal governments are adopting smart-growth principles to deal with forms and patterns of urban development that planners and organizations have deemed unsustainable (Downs, 2005; Song, 2005). Undesirable urban features include unlimited outward development; “leapfrog” expansion of new, low-density developments; uncoordinated planning; and large-scale conversion of open space, farm lands, and environmentally sensitive lands to urban uses (Burchell et al. 2000; Downs, 2005). The smart-growth concept underscores the negative consequences of undesirable urban development patterns, which includes unlimited outward and automobile-dependent types of urban development. Instead, it calls for compact, diverse, and walkable developments and more environmentally friendly urbanization. Since its conception, many public and private planning agencies and organizations have endorsed this concept (Arku, 2009).

Smart growth means different things to different people. Diverse groups and organizations emphasize different selections of its principles. For example, environmentalist groups, such as the Sierra Club, believe uncontrolled outward development is irresponsible and that poorly planned development destroys space, increases traffic, and puts undue pressure on infrastructure facilities (Sierra Club 2001). City officials and urban planners across various urban jurisdictions have interpreted the concept differently and emphasize different principles. While some favor redeveloping existing older areas and repairing existing infrastructures, others stress increasing public transit to reduce vehicle trips and travel miles. Nevertheless, the principles listed in Table 2 are generally considered as key elements of most smart-growth programs. These strategies have one overarching goal: Rather than concentrating development at the urban fringe, urban development efforts should encourage greater compactness and an efficient use of already developed urban areas. In a very broad sense, smart growth is a reaction to the sprawling form of urbanization characterized by low overall densities, unlimited outward and “leapfrogging” expansion of new development, a rigid specialization of land uses, and large-scale conversion of open space and environmentally sensitive lands to urban uses (Filion 2003; Filion and McSpurren 2007; Downs 2005). The concept calls for focusing future growth on existing built-up areas to establish a compact, efficient, and environmentally sensitive pattern of urban development that provides people with various transportation systems and a range of housing and employment choices. Smart growth does not imply no growth; rather, it emphasizes revitalizing the already-built-up environment and, to the extent necessary, fostering compact urban development.

Smart-growth development projects are compact and walkable, offer a mix of uses, and create a sense of place. Such projects on infill sites have environmental benefits because they can reduce development pressure on outlying areas, helping to safeguard lands that serve important ecological functions; can reduce the amount that people drive, improving air quality and reducing greenhouse gas emissions; and can lead to the cleanup and reuse of formerly economically viable but now abandoned sites, including those contaminated with hazardous substances (EPA, 2014). Infill development occurs in a built-up neighborhood, often using vacant land or rehabilitating existing properties.

Developers of all sizes—from independent, small-scale firms to large, publicly traded companies—are building infill projects throughout the country and are doing so profitably. Developers have sought infill projects as an opportunity to participate in flourishing downtown markets. Opportunities for infill development exist in cities and towns throughout the country—infill is now a significant and growing share of residential construction in many metropolitan regions. Many corporations are moving to infill locations, in part because they recognize the competitive advantages of being closer to the central city. Lower infrastructure costs and higher rent and sales prices for infill projects will help make infill projects profitable for developers, supporting neighborhoods that are better for the environment and improve quality of life (EPA, 2014).

Urban development patterns and land-use changes in Iranian cities

There is evidence that some of the Iranian cities are experiencing urban sprawl. The presence of urban sprawl within urban development patterns and the resulting negative impacts have been studied in a number of studies. Although the observations are limited in number, they cover large metropolitan areas like Tehran (Roshan et al., 2009), Mashhad (Hosseini et al., 2010a), Tabriz (Sadrmosavi and Rahimi, 2012), and Kerman (Hosseini et al., 2010b) to mid-sized cities like Yazd (Ebrahimpour- Masoumi, 2012) and Urmia (Mobaraki et al., 2012). In an urban development pattern point of view, urban sprawl in the Iranian cities has particular characteristics. Today’s massive sprawl is only a part of urban transformations that aimed at preparing the urban form of the cities for car use. These governmental efforts that took place between 1930 and 1960 not only changed the urban textures of the traditional and organic cities but also influenced the lifestyle of the urban dwellers by easing motorized travels. In recent years, urban sprawl in Iranian cities constructed and decreased garden plots, forest, and agricultural areas (Ebrahimpour-Masoumi, 2012).

Many studies have evaluated urban land-use changes and urban future expansion. In most studies, GIS and RS data for evolving urban expansion (Xiao et al., 2006, Jin-Song et al., 2009, Peijun et all., 2010), remote sensing and spatial metrics application in urban modeling (Herold et al., 2005), and future land-use changes are forecasted based on past development pattern and expansion to periphery (L’opez et al. 2001) and urban sprawl (Walker, 2001). But employment of smart-growth strategies for future expansion is a new strategy. In this paper, we evaluated changed urban land use in recent decades using GIS and RS data and modeled future land-use changes, and also, we examined the infill development pattern for Tabriz future development with a new method (LTM).

In most models, future land-use changes are forecasted based on past development patterns. In fact, they modeled the continuity of urban land-use changes based on past expansion process such as urban sprawl. But in this paper, we used infill development pattern for analyzing this pattern in future development. So, the main advantage of this research compared with other studies is, in addition to the modeling of urban development based on past trends and warning of future development problems for planners and decision makers, we used a new approach to urban future development. In fact, this study also highlights the problems of the PDP and suggests a new method and strategy for control of urban future development modeling using smart growth based on infill development.


In infill development, growth pressures are reduced in rural and undeveloped portions of the metropolitan area in the periphery. Public and private strategies shift the demand for growth from outer suburban and peripheral areas to existing central cities and inner suburbs so that growth is more evenly spread and takes advantage of existing infrastructure. This approach fills gaps in existing communities and plays a critical role in achieving community revitalization, resource and land conservation, and alternatives to sprawl development. This is not a new development pattern; it draw from past growth management, land preservation, and community development practices. in the last decades, Concentrated industrial zones in Iranian cities, increasingly expanded urbanization and development of cities to periphery, demolished agricultural lands, gardens, and green spaces. Tabriz city also is not exempt in this development pattern, and this sprawl development has destroyed green spaces and agricultural areas. The result of satellite image classification from 1989 to 2005 shows that rate of changes in built areas has been 107 % while the change rate of population was less than 34 %. The future development of Tabriz using the PDP model will destroy green spaces and agricultural areas. But the result of the IDP model  shows that the green spaces and agricultural areas are protected. So, for land protection and achievement of urban sustainable development in Tabriz, the urban managers attend to the infill development pattern and use this pattern for future development of cities.


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Rahimi, A. A methodological approach to urban land-use change modeling using infill development pattern—a case study in Tabriz, Iran. Ecol Process 5, 1 (2016).

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