Using Satellite Imagery to Analyze Land Use and Land Cover Changes (LULC) in the Motobus Area Ecosystem, Nile Delta, Egypt

Document Type : Research papers

Authors

1 Faculty of Agriculture Saba Basha Bolkely P.O. 21531

2 Soil and Agricultural Chemistry Department, Faculty of Agriculture (Saba Basha), Alexandria University,

3 Soil, Water and Environment Res. Inst. (SWERI), Agricultural Research Center (ARC), Giza, Egypt.

Abstract

Understanding the changing dynamics of land use and land cover (LULC) is critical for efficient ecological management modification and sustainable land-use planning. This work aimed to identify and categorize seven Landsat satellite images over 50 years in Egypt's Nile Delta Motobus Area Ecosystem. In the present study, the detection of historical LULC change dynamics for a time from 1972 to 2022 was performed. We used seven Landsat images, acquired by different sensors, as spatial and temporal data sources for the study region. Moreover, the process of image categorization employed a supervised classification method. The results of the LULC change estimation between 1972 and 2022 revealed that the proportion of built-up areas in the study area increased from 5.5% in 1972 to 12.5% in 2022. In addition, the proportion of cultivated land has risen from 56.45% of the total area in 1972 to 63.55% in 2022, primarily because of continuous soil reclamation initiatives in desert regions beyond the Nile Valley. Furthermore, from 1972 to 2022, desert regions saw a significant reduction in their total land area, losing around 50% of their original extent, whereas water bodies saw a minimal and negligible expansion. These trends are characterized by a decline in desert regions and an increase in recently restored urban and agricultural areas. Regarding the CA-Markov model validation, the Kappa indices varied between 0.86 and 0.93 for both the actual and simulated maps. This indicates that the model performed exceptionally well in predicting future trends in LULC.

Keywords

Main Subjects


INTRODUCTION

Land degradation is a worldwide problem that arises from factors such as population growth, improper land use, forest loss, global warming, and other variables (Bakr and Afifi, 2019). Understanding land use and land cover (LULC) changes in a region is critical for sustainable land management and development (Das and Sarkar, 2019) LULC change is accelerating in many developing nations due to rapid global economic and population growth, as well as globalization (Iizuka et al., 2017). Various elements such as scale, time, politics, economy, and social factors influence LULC changes (Calicioglu et al., 2019). LULC alterations have been identified as important factors in causing environmental changes at all geographical and temporal dimensions (Adepoju et al., 2006). The changes above, including climate change, biodiversity loss, and pollution of water, soil, and air, are regarded as the utmost concerns for humanity (Zabihi et al., 2020). LULC refers to the specific physical characteristics of the land, including forests, wetlands, impervious surfaces, agriculture, and water bodies (Nath et al., 2020). It also encompasses how humans utilize these land types within a given area. Moreover, LULCs are geographically scattered as a result of the dynamic interplay between human activities and natural elements of ecosystems (Nath et al., 2020; Zabihi et al., 2020). Various factors, including natural, social, and economic elements influence the intricate dynamics of LULC systems. The availability and distribution of LULC have a significant impact on climate, environmental issues, and the conditions of natural ecosystems (Cihlar, 2000; Yan et al,. 2015). Moreover, alterations in global LULC are a primary source of considerable apprehension regarding future LULC patterns (Srivastava et al., 2012). Furthermore, changes in LULC have a crucial role in the sustainability and management of natural resources (Hou et al., 2019; Lombardi et al., 2020). Scholars widely recognize satellite imagery as a valuable source of information for LULC analysis (Saadat et al., 2011; Yuan et al., 2005). Although attempts to use different interpretation techniques for LULC mapping have been made since the mid-1970s satellite-based imaging remains the preferred method (Dewan and Yamaguchi 2009; Gomes et al. 2020). In recent decades, the field of science and technology has made significant progress, leading to the development and implementation of various LULC techniques worldwide (Phiri and Morgenroth, 2017; Reimann et al., 2018). Remote sensing (RS) and geographic information systems (GIS) techniques offer valuable methods for comprehending, examining, and tracking LULC changes in landscapes over time (Armin et al., 2020; Kotaridis and Lazaridou, 2018). Several studies have utilized these techniques to investigate LULCs (Hua, 2017; Liping et al., 2018; Rawat and Kumar, 2015). When applied to a specific region, the periodic imaging data from Landsat provides a reliable data source for predicting patterns in land use and land cover (Jawak et al. 2015). Moreover, a range of methods have been developed to ascertain past and future LULC patterns. These models provide suitable methods for identifying the spatial variability patterns in LULC. In addition, to get a good idea of how well the model predicts LULC changes in a certain area, it needs to be checked by comparing the expected changes in LULC with the actual changes (Nath et al., 2020).The Nile Delta of Egypt is the third most vulnerable mega-delta to climate change, according to the IPCC (Field et al., 2014). Low-lying lands are often below sea level (BSL), so sea level rise (SLR) and climate change gradually flood them (Chi and Ho, 2018; Derdouri et al., 2021; El-Shihy and Ezquiaga, 2019). Inundation, degradation ,seawater infiltration, groundwater pollution, and estuarine and coastal water contamination are also common in coastal areas (Masria et al., 2014; Nofal et al., 2015). Due to these issues, it is essential to monitor historical land surface elevation variations to assess soil surface increases and decreases and determine specific surface elevation changes over time and space. Egypt has about five Mediterranean coastline lakes, from east to west, including Bardawil, Manzala, Burullus, Idku, and Mariout. Every lake in the northern Sinai Peninsula, except Lake Bardawil, is deltaic, revealing that Egypt's lakes, despite their economic importance, are contaminated, deteriorating, and under human and environmental stress (Abd El-Hamid et al., 2021; Arowolo and Deng, 2018; El Kafrawy et al., 2019). Desertification, infilling, and cultivation have reduced deltaic lake coverage. Deltaic lakes store industrial, agricultural, and domestic wastewater. These lakes were heavily polluted. Increasing sea levels affect northern shore lakes with saltwater intrusion. Lake size and neighboring land usage must be monitored (Abd El-Hamid et al., 2021; Halim et al., 2013; Radwan, 2019). This study emphasizes the combined use of remote sensing and GIS tools to detect changes in LULC in the Motobus region of Kafr El-Sheikh, Egypt. The study aims to accomplish three primary objectives. 1) Determine the LULC classes and classify them using satellite images and classification methods, 2) To create LULC maps for analyzing changes that took place from 1972 to 2022, and 3) To assess the precision of the LULC categories to understand the mapping error matrix. The study's findings can offer valuable insights into land-use development policies in the region. Figure (1). General location of the study area

 

Table (1). The monthly averages of the primary climatic parameters of the study area from 1981 to 2021

Parameters

Jan

Feb

March

April

May

June

July

August

Sept

Oct.

Nov.

Dec.

Minimum Temperature, C°

10.18

10.22

11.36

13.24

16.23

19.66

22.52

23.63

22.21

19.39

15.62

11.87

Maximum Temperature, C°

21.03

23.09

26.31

30.62

32.95

33.48

33.56

33.30

32.90

31.33

27.25

23.21

Average Temperature, C°

14.95

14.88

16.23

18.84

22.03

25.11

26.86

27.44

26.21

23.81

20.38

16.91

RH (%)

68.96

68.47

68.01

65.57

65.37

66.29

67.91

68.01

66.36

66.58

66.90

68.08

U2 (m/s)

4.39

4.39

4.34

4.19

4.03

4.15

4.30

4.06

3.91

3.78

3.89

4.12

Precipitation (mm/month)

29.45

20.19

10.68

6.06

0.39

0.26

0.00

0.00

0.13

5.32

16.13

25.91

 

 

Table (2)The average air temperature and annual precipitation values across the four decades within the study region.

Period

Temperature (°C)

Annual Precipitation

(mm)

Maximum

Minimum

Average

 

1981-1990

34.2

9.2

20.8

111.27

1991-2000

34.8

9.7

20.9

98.61

2001-2010

35.2

10.0

21.3

93.34

2011-2021

35.8

10.0

21.6

151.14

2.2. Geology and soil unit

The geological composition of the area under study consisted primarily of Holocene Lacustrine sedimentary rocks with sabkha formations in the majority of regions, as well as Holocene Fluvial sedimentary rocks (Figure 2). As per the Key to Soil Taxonomy (Gad and Ali, 2011), the research area exhibits four distinct taxonomic soil units. In the northeast, there are common haploid organisms, whereas in the northeast and south-central regions, there are characteristic torripassament organisms. The eastern part of the territory is home to Vertic Torrifluvents, while Typic Torrifluvents occupy the remainder of the region. In conjunction with a raster methodology that simplifies calculations, ArcGIS Pro 2.7 is a mapping software that supports both raster and vector data (ESRI, 2021). Subsequently, the soil's potential uses were assessed and a more comprehensive understanding of its complexity and variability was achieved by superimposing classified EC, CaCO3, and depth maps onto the land.

 

Figure )2(. The geology of the study area.

2.3. Data sets

This study employed several datasets, specifically Landsat satellite images from the years 1972, 1984, 1998, 2002, 2010, 2015, and 2022. A total of 80 soil measurements, spanning an area of 156390.30 hectares. These observations were obtained from Earth Explorer on the US Geological Survey (https://earthexplorer.usgs.gov). Radar technology enabled the acquisition of the SRTM-DEM, enabling the precise mapping of the Earth's surface with an accuracy of one arc-second and intervals of 30 meters. The last update occurred in 2022 (Bakr and Bahnassy, 2019). The downloaded SRTM-DEM has been georeferenced and prepared for use in the ArcMap software. The methodology flowchart is shown in Figure )3(.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure )3(. The methodology flowchart for the current research.

2.4. Satellite images preprocessing

The LULC analysis utilized seven Landsat satellite pictures spanning from 1972 to 2022, including data from the years 1972, 1984, 1998, 2002, 2010, 2015, and 2022. Table )3 presents data regarding the satellite pictures that were utilized. Furthermore, Table (4) presents a detailed depiction of the LULC classes. The satellite images were adjusted for geometric accuracy using scanned topographic maps and 80 ground truth points (GTPs) collected from the research region in 2022. The images were then aligned to Zone 36 and projected using the Universal Transverse Mercator (UTM) coordinate system with the World Geodetic System 1984 (WGS84) datum. The resulting image has an average root mean square error (RMSE) of 0.3 pixels. Since the images were acquired in July without any cloud cover, there was no need for atmospheric correction. For the study, the Landsat images were cropped to match the borders of the study area based on the 2022 image. The appropriate combination of bands was selected to improve visualization and accurately identify different Land Use and Land Cover (LULC) classes. ENVI 5.3 software was used for image preprocessing. The Landsat images allocated for the study were subset to match the borders of the study area based on the 2022 image. The appropriate band combination was selected to enhance visualization, allowing for the differentiation of various training locations for different Land Use and Land Cover (LULC) classes with improved accuracy. Image preprocessing was conducted using ENVI 5.3 Software (ENVI, 2015).

 

Table (3). The present study used Landsat satellite images.

Year

LANDSAT Satellite

Scene ID

Path/Row

Pixel Size

Sun Elevation

Sensor ID

No. of Bands

1972

LS-1

LM11910381972263AAA04

191/038

60

50.37

MSS

4

1984

LS-5

LT51770381984255XXX04

177/038

30

51.72

TM

7

1998

LS-5

LT51770381998245RSA03

177/038

30

55.33

TM

7

2002

LS-5

LT51770382002101XXX01

177/038

30

55.09

TM

7

2010

LS-5

LT51770392010198MTI00

177/039

30

64.92

TM

7

2015

LS-8

LC81770392015116LGN00

177/039

30

63.78

OLI_TIRS

11

2022

LS-8

LC91770382022207LGN00

177/038

30

68.72

OLI_TIRS

11

 MSS: Multispectral Scanner; TM: Thematic Mapper; OLI: Operational Land Imager; TIRS: Thermal Infrared Sensor.

 

 

Table (4). Key land use and land cover categories in the research region

LULC Classes

Description

Bare soils

Includes uncultivated lands, dunes, and built-up land (residential, commercial, roads, …etc)

Agricultural land

Cultivated land with all types of crops

Fish farms

Established around Burullus Lake

Water bodies

Mainly Burullus Lake

Natural vegetation

The natural plants that cover the surface of the study area

2.5. Land use/land cover classification

The research region was classified into five distinct LULC groups: bare soils, agricultural land, fish farms, water bodies, and natural vegetation. Then these classifications are through the visual interpretation of satellite images and field excursions. We identified specific training sites for each LULC class using the Maximum Likelihood Classifier (MLC) method. Using these training samples, we generated a signature file containing the multivariate statistics for each LULC class. We then applied the MLC algorithm using this signature file as input. Despite its simplified configurations, the MLC method maintained satisfactory performance, achieving high accuracy levels. Moreover, it demonstrated improved performance even with a reduced number of training samples (Li et al., 2014; Valero Medina and Alzate Atehortúa, 2019). While contemporary machine learning algorithms (MLA) like support vector machines (SVM), artificial neural networks (ANN), and random forests (RF) are often recognized for their higher accuracy, the assertion that the maximum likelihood classifier (MLC) maintains validity persists.

2.6. The evaluation of the accuracy of classified images

The reliability of the spatial information derived from remote sensing images for accurate image classification is determined by accuracy evaluation processes (Ibharim et al. 2015; Lin et al. 2015). When integrated with ground control points that function as a reference, remotely sensed spatial information is both precise and dependable (Congalton and Green 2019). Consequently, the accuracy of each categorized image was assessed and determined by calculating the producer's accuracy, user's accuracy, overall accuracy, and Kappa coefficient values (Zhang et al. 2016). Furthermore, the Markov model, GIS, and RS data were successfully integrated as a result of the nature of GIS and its incorporation with remote sensing (RS). Consequently, thematic maps of various LULC for the investigated periods were generated using ArcGIS 10.8 software. This assessment covered images from 1972, 1984, 1998, 2002, 2010, 2015, and 2022, aiming to determine overall accuracy and conduct kappa analysis. We applied 50 ground truth points (GTPs) and performed visual interpretation using Google Earth to verify the accuracy. Then computed the overall accuracy and kappa coefficient for the two datasets using the equations provided (Vivekananda et al., 2021).

 

Where: N represents the total number of pixels, r represents the number of classes,  represents the total pixels in row “k” and column “k,”  represents the total samples in row “k,” and represents the total samples in column “k” in the error matrix.

  1. RESULTS AND DISCUSSION

3.1. Digital Elevation Model (DEM)

The findings reveal that land surface elevation within the study area ranged from -1 to 7 meters in 2022. To delineate the extent of each elevation category, the Digital Elevation Model (DEM) underwent classification, as depicted in Figure (4). The analysis uncovered significant variability in land surface elevation in 2022, with roughly 10.05% of the landmass lying within an altitude range of 0 to 7 meters above sea level (ASL). However, the most prominent area was situated at the minimum altitude (<0, BSL). In 2022, elevations below zero encompassed approximately 89.95% of the study area, as illustrated in Figure 5.

 


Figure (4). The DEM (Digital Elevation Model) image of the research area in 2022

 

 

 

3.2. Land Use/Land Cover Change (LULCC)

The Maximum Likelihood classifier (MLC) was used as a supervised classification technique to produce the final Land Use and Land Cover (LULC) classified thematic maps for the years 1972, 1984, 1998, 2013, and 2022 (Figure 5). In addition, Table (5) and ( Figure 6) display the total area in hectares and the percentage of various land use and land cover (LULC) classes in the study area for the given dates.

 

 

Table (5). The percentage of the total area covered by each LULC class in the classified maps of the study region between the years 1972 and 2022, expressed as hectares (ha) and percentages (%)

Year

unit

Land use/land cover classes

Water bodies

Natural vegetation

Fish farms

Agricultural Land

Bare soil

Total

1972

Ha

21055.12

7492.43

0.00

88543.27

39759.06

156849.87

%

13.42

4.78

0.00

56.45

25.35

 

1984

Ha

16507.26

8747.66

0.00

88847.73

42518.24

156620.88

%

10.52

5.58

0.00

56.65

27.11

 

1998

ha

12701.97

7271.67

7580.39

98625.18

30229.19

156408.40

%

8.10

4.64

4.83

62.88

19.27

 

2002

ha

10453.93

8886.44

13780.49

102668.04

20601.37

156390.26

%

6.66

5.67

8.79

65.46

13.13

 

2010

ha

11090.18

7123.75

14713.68

95871.61

27591.02

156390.25

%

7.07

4.54

9.38

61.12

17.59

 

2015

ha

10219.41

8406.70

14451.58

97039.68

26272.89

156390.26

%

6.52

5.36

9.21

61.87

16.75

 

2022

ha

9981.56

9213.06

13375.62

99387.49

24432.52

156390.26

%

6.36

5.87

8.53

63.36

15.58

 

Change,

ha/year

ha

-221.47

34.41

241.47

216.88

-306.53

 

 

 

Figure (5). Maps illustrating the classification of different land use/land cover classes in the study area from 1972 to 2022 were generated.

 

The findings (Figure 5 and Table 5) demonstrate the presence of five primary land use and land cover (LULC) categories in the study area: barren soils, cultivated land, aquaculture facilities, indigenous vegetation, and bodies of water. Our findings reveal that fish farms, initially established in the study area in 1998, have rapidly expanded, taking up approximately 9.21% and 8.55% of the designated research area in 2015 and 2022, respectively. In contrast, water bodies have decreased significantly over time. In 2022, this group accounted for around 6.36% of the study area, a decline from 13.42% in 1972. The findings of the LULC transformation are consistent with the observations in the Kafr El-Shiekh governorate, Egypt, which exhibited a comparable state (Bakr and Afifi, 2019). It was determined that fish farms had not been observed before and had recently started to develop around Burullus Lake approximately in 1998. From 1972 to 2022, the proportion of bare soil decreased, dropping from 25.35% in 1972 to 15.58% in 2022. In 1998, there was a 6.08% decrease in the extent of exposed soil, indicating that efforts to restore the land may have focused on the sand sheet located in the northeastern portion of the research area.

The study area is predominantly characterized by agricultural land, which occupies a vast expanse. It experienced significant growth over time due to government reclamation initiatives. Specifically, between 1972 and 2022, it increased from 56.45% to 63.36%, respectively. We computed the mean overall pattern for the land use and land cover (LULC) categories. The water bodies experienced a decrease of 221.47 hectares per year over 50 years. Furthermore, the cultivation activity reduced the bare soil by 306.53 hectares per year. The area of natural vegetation, fish farms, and agricultural soil increased by 34.41, 241.47, and 216.88 hectares per year, respectively, over 50 years. (Abd El-Hamid et al., 2021) suggest that the terrestrial areas surrounding the Egyptian deltaic lakes (Manzala, Burullus, Idku, and Mariout) may experience similar levels of environmental and human-induced pressures over 80 years. Primary stressors on these ecosystems include the establishment of fish farms and the expansion of cultivated land on barren soils.

3.3. Assessment of accuracy

For each classified map in Figure (5), we derived the kappa coefficient and overall accuracy from satellite images taken in 1972, 1984, 1998, 2002, 2010, 2015, and 2022. Table 6 displays the final values for these parameters. According to (Lea and Curtis, 2010), the overall accuracy of all classified photos is deemed satisfactory. Their percentages ranged from 88% to 96%. Moreover, Table (6) demonstrates that the kappa coefficients ranged from 0.86 to 0.95. This indicates that there is a substantial level of concurrence between the produced and authentic classified maps.

 

Table (6). shows the overall accuracy and kappa coefficient for the maximum likelihood classification of images in 1972, 1984, 1998, 2002, 2010, 2015, and 2022.

 

Year

1972

1984

1998

2002

2010

2015

2022

Overall Accuracy

0.900

0.960

0.900

0.883

0.917

0.900

0.950

Kappa coefficient

0.875

0.950

0.880

0.860

0.900

0.880

0.940

 

                The results indicate that the MLC has the potential to provide a reliable and precise assessment of land use and land cover change in the study area. The findings are consistent with the studies conducted by (Bakr and Abd El-kawy, 2020). The study's findings also showed that using geo-informatics, remote sensing, GIS, and modeling is effective for making changes to land use and land cover (LULC) and mapping, monitoring, and managing resources.

The changes in land use and cover related to agriculture in river basin regions have a significant impact on the development of nations that depend on agriculture as a major part of their economy. Emphasizing agricultural activities in domestic policies has significant implications, particularly for the lower regions of these river basins. This study emphasizes the significance of promptly evaluating sustainability indicators for land and water resources in the entire Nile Delta, especially in the coastal zone. It is crucial to have information on LULC change and the factors influencing these changes for effective long-term planning, as they provide additional insights. Long-term data can uncover positive findings about LULC change and its effects. It is crucial to consistently track this data in conjunction with the research progress. Future research should concentrate on analyzing the changes in land use and land cover within the basin using multi-criteria evaluations. This will offer an additional understanding of how population growth and climate change impact the water, vegetation, and wildlife in river basins. The results of this research would be useful in determining effective methods for improving the Nile Delta and identifying upcoming dangers that require immediate action to protect the longevity of the basin's resources.

3.4. Soil units

         Based on the soil unit map (Figure 6) approximately 12% of the research area's northern shoreline along the Mediterranean consists of saline soils. Non-saline soils comprise 10% of the research area. The remaining portion of the research region consists of moderately salinized soils. The findings are consistent with (Alfiky et al., 2012) research stated that the study area's northern section is classified as "River Shelf Lands" while the southern part is categorized as "Marine River Sedimentary Lands." The Lake area consists of three distinct components: Burullus Lake, fish farms, and natural vegetation that encompasses a portion of the study area (Figure 6).

 

 

 

 

Figure (6). Soil units of the studied area.

 

 Conclusion

The study demonstrated the effectiveness of using remote sensing and GIS techniques to analyze LULC changes in the Motobus region of the Nile Delta in Egypt between 1972 and 2022. The supervised maximum likelihood classification of Landsat satellite images reliably identified and mapped five LULC classes - bare soil, agricultural land, fish farms, natural vegetation, and water bodies. Accuracy assessment confirmed the high classification accuracy. Over the past 50 years, agricultural land has increased considerably, from 56.46% to 63.36% of the total area, largely attributed to land reclamation efforts. In contrast, water bodies and bare soils showed significant declines, with water bodies falling from 13.42% to 6.36%.  Fish farms emerged in 1998 and expanded rapidly to cover 8.53% by 2022. The digital elevation model analysis highlighted that around 90% of the study area lies below sea level, indicating high vulnerability to flooding from sea level rise. The LULC change detection results can guide regional land use planning policies and practices. The study emphasizes the value of regularly monitoring LULC modifications using earth observation data to support informed decision-making for sustainable land management.

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