APPLICATION OF MANGROVE FOREST COVERAGE DETECTION IN NGURAH RAI GRAND FOREST PARK USING NDVI TRANSFORMATION METHOD.

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Jour nal of The oretical a nd Applied Information Tec hnology

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Journal of Theoretical and Applied Information Technology 31st_{October 2015. Vol.80. No.3}

ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195

521

APPLICATION OF MANGROVE FOREST COVERAGE

DETECTION IN NGURAH RAI GRAND FOREST PARK

USING NDVI TRANSFORMATION METHOD

1_{I PUTU WAWAN SANJAYA PUTRA,}2_{I KETUT GEDE DARMA PUTRA,}3_{I PUTU AGUNG}

BAYUPATI, 4A.A.K. OKA SUDANA, 5I DEWA NYOMAN NURWEDA PUTRA, 6NI KADEK DWI

RUSJAYANTHI

1,2,3,4,5,6

Department of Information Technology, Engineering Faculty in Udayana University Bukit Jimbaran, Bali, Indonesia, Telp. +62 85102853533

E-mail: 1wawansingaa@gmail.com, 2ikgdarmaputra@gmail.com, 3bayuhelix@yahoo.com,

4

agungokas@unud.ac.id, 5nurweda14@gmail.com, 6dwi.rusjayanthi@gmail.com

ABSTRACT

This study aims to detect the area and the changes of Mangrove forest coverage in Ngurah Rai Grand Forest Park in Bali. This detection was managed automatically by using a particular application constructed by employing Matlab programming language. It is more rapid and effective rather than manual computation and direct field measurement. NDVI is the frequently used method in indentifying vegetation. The value of pixel of NDVI is obtained from a formula constituting two images of Landsat satellite. The pixel value of NDVI ranges between -1 to +1 in which the positive value indicates the vegetations and the negative value indicates non-vegetation objects. NDVI Threshold is a process of classifying objects based on the NDVI pixel value. NDVI Threshold is conducted by providing range of value towards NDVI pixel. Mangrove forest is included in the category of briny forest, the NDVI pixel value for this kind of forest ranges from 0.4 to 0.8. The result of NDVI Threshold is used to calculate the total pixel of NDVI which includes within that range. Then, the result will be multiplied to the spatial resolution of Landsat satellite to obtain the area of Mangrove forest coverage.

Keywords: NDVI, Landsat, NDVI Threshold, Mangrove Forest, Mangrove Coverage

1. INTRODUCTION

Manual computation is still frequently used to calculate the area of vegetation. Generally, any researches related to the field of Remote Sensing are conducted by utilizing an application of image processing provided by the third party application. This application is provided in the Internet, it can either be free-of-charge or charged.

The area of Mangrove forest in Indonesia is around 4.25 million hectares or 3.98% of the total area of Indonesian forest, however, it is only 2.5 million hectares of Mangrove forest which are considered well-managed [1]. Ngurah Rai Grand Forest Park is briny forest area. This kind of forest is highly affected by the ebb and flow of sea water. The main vegetation in this Grand Forest Park is Mangrove. Ngurah Rai Grand Forest Park is legalized based on the Decree of the Minister of Forestry in 1993 stated that the area of this Grand Forest Park is 1373.50 hectares. Administratively, Ngurah Rai Grand Forest Park is located in two regencies, which are Badung Regency and Denpasar City. Area functional shift, littering, and polluted water are the major problems affecting the growth of Mangrove forest in Ngurah Rai Grand

Forest Park. The condition of that Mangrove forest can be identified by using various approaches, one of them is Remote Sensing managed by identifying index value of vegetation [2].

The index value of vegetation provides information regarding the percentage of the coverage of vegetation, Leaf Area Index, plants,

biomass, FAPAR (Fraction of Absorbed

Photosynthetically Active Radiation),

photosynthesis capacity, and the estimation on the rate of carbon dioxide absorption [3] [4]. There are many methods that can be utilized to calculate

Vegetation Index. Normalized Difference

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522 manipulation. To recognize the emergence of those problems, supervision over Mangrove coverage needs implementing immediately by utilizing any technologies, i.e. Remote Sensing and Digital Image Processing. The purpose of this study is to obtain the result of Mangrove area coverage, area of Mangrove coverage classification, and alteration of the area in particular years. This study was

conducted by construction satellite image

processing application using Matlab programming language.

2. METHODS

The common method for Application of Mangrove Forest Coverage Detection started from the image selection process obtained from Band Landsat imagery. To get the input of the bands

images, user must first download it on

earthexplorer.usgs.gov site. Figure 1 is a Flowchart of processing method using the implementation of Remote Sensing.

Figure 1: Flowchart of Image Processing Method

Image processing is started with the input of the Band Landsat imagery. There are two processes before achieving the final outcome of Mangrove vegetation area, which are Composite and NDVI processes using Reflectance correction [12].

The next stage is to build an application. This application has two menus with different processing purposes. The first is the NDVI Tools menu. This menu has the ability to process Band

Landsat inputs in the form of image with TIF file format into information in the form of Mangrove coverage area. The second menu is the Coverage Changes menu. The menu has a function to display the Mangrove coverage area similar with the processing on the NDVI Tools menu, but this menu has more capabilities which can display Mangrove coverage area based on different date input as a comparison. This menu can also display the Mangrove area changes occur during a certain period. The entire process in this application can be seen in the following activity diagram.

2.1 Activity Diagram

Activity diagram in NDVI Tools and Coverage Changes are displayed in Figure 2 and Figure 3. Figure 2 describes the course of activity of NDVI Tools menu displaying the course of the Band inputs to displaying the final result in the form of Mangrove coverage area. Figure 3 represents the course of activity of Coverage Changes menu displaying the courses of Band inputs to displaying final result in the form of the area comparison and the shift of value of Mangrove

coverage.

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523 Figure 3: Activity Diagram of Coverage Changes

2.2 Bands Input

The images of Remote Sensing are attained from a particular satellite, aircraft, or other vehicle. Those images are originated from the

sensors recordings which have distinct

characteristics within each level of height, it determines the differences of the resulted data of Remote Sensing [7]. Landsat is one of distant sensing vehicle launched in 1972 [8]. The satellite images used in this study are originated from different Landsat satellites, they are Landsat 7 and Landsat 8. This Landsat image can be downloaded for free in http://earthexplorer.usgs.gov.

Landsat satellite has several

electromagnetic wave sensors with different recording specifications. The sensor of Landsat satellite is widely known as Band. In this study, the input of image is obtained from four types of Bands, which are Near Infrared Band, Visible Red Band, Visible Green Band, and Visible Blue Band. As seen in Table 1, Landsat satellite specifications have different Band numbers based on the types of captured electromagnetic waves.

Table 1: Landsat Band Requirements (Source: NASA).

Wave Spectrum _OLI/TIRSLandsat 8 Landsat 7 _ETM+

Spatial Resolution (one pixel)

Near Infrared Band 5 Band 4 30m x 30m

Visible Red Band 4 Band 3 30m x 30m

Visible Green Band 3 Band 2 30m x 30m

Visible Blue Band 2 Band 1 30m x 30m

Figure 4 is the images obtained from the wave reflection. Each image is going to be utilized as an input during processing process to determine NDVI value and the area of Mangrove forest coverage. In determining NDVI value, there is a composite feature requiring the combination of those four Bands, while the process of NDVI requires only two input Bands, which are Near Infrared and Visible Red.

Figure 4: Input Image

Figure 5 represents how subset process is conducted by using Region of Interest (ROI). Subset is the process of cutting the satellite images into the desired size. ROI data are in the form of vector standing as the administrative boundary of a region. This vector is available and it can be freely downloaded from several governmental sites.

Figure 5: Subset by Region of Interest

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524 employed to identify the rate of greenery, this is advantageous for the classification of vegetation area. NDVI value is acquired from mathematical formula between Near Infrared Band and Visible Red Band [10]. Those two Bands are selected due to light reflection by objects (reflectance), light absorption by objects (absorption), and light transmission by objects (transmittance). Maximum reflection on vegetation occurs within the wave plength of Near Infrared. This maximum reflection is caused by the structure of the leaves (mesophyll) that can increase Near Infrared wave reflection. Maximum absorption occurs within the wave length of Visible Red. This absorption is caused by Chlorophyll [10].

NDVI equation is the result of the subtraction of Near Infrared Band pixel value to Visible Red Band pixel value which is divided by the sum of Near Infrared Band pixel value to Visible Red Band pixel value. Band input which is formerly used must be corrected radio-metrically [12]. This process produces image with new pixel value as illustrated in Figure 6. Following is the formula of NDVI [11].

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NDVI process produces new image with the value of pixel ranges from -1 to +1. The positive value of pixel indicates the existence of vegetation, while the negative value of pixel indicates non-vegetation object. The classification of object constructed based on the value of NDVI is represented in Table 2 [13].

Table 2: NDVI Value.

Classifications NDVI Value

Cloud, Water, Snow < 0

Rocks and Bare Land 0 – 0,1

Grassland and Shrubs 0,2 – 0,3

Tropical Forests, Mangrove

Forest 0,4 – 0,8

2.3 NDVI Threshold

NDVI Threshold is the process of setting up range limitation to NDVI pixel value. In this research, Mangrove obtains NDVI Threshold with the range of NDVI pixel value of 0.4 to 0.8 referred to Table 2. The calculation of Mangrove coverage

area is administered by sum up NDVI pixels that gets into the range of NDVI Threshold. The total of pixel is multiplied by spatial resolution value of Landsat image, which is 30 x 30 (m2).

The illustration in Figure 7 shows the image of NDVI Threshold with the size of matrix of 5 x 5 obtaining new values; 14 pixel points which worth is 1 and 11 pixel points which worth is 0. The pixel point which worth is 1 is NDVI Threshold under the consideration that NDVI value of Mangrove ranges from > 0.4 and ≤ 0.8, hence, it can be ascertained that NDVI Threshold which worth is 1 is Mangrove vegetation.

Figure 6: NDVI Transformation

Figure 7: NDVI Threshold

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525 Table 3: Coverage Classification.

Classifications NDVI Threshold

Very Rare 0,4 < NDVI ≤ 0,45

Rare 0,45 < NDVI ≤ 0.5

Medium 0,5 < NDVI ≤ 0.55

Full 0,55 < NDVI ≤ 0.8

3. RESULT AND DISSCUSION

The implementation of the method was managed by constructing a particular application. This application consists of two menus. The main menu are labeled as NDVI Tools. These menu can

process NDVI equations and provide the

information related to Mangrove forest coverage area in a certain date. Figure 8 shows the image of NDVI Tools.

Figure 8: NDVI Tools

The subsequent menu is Vegetation Changes menu. This menu processes NDVI equations from two inputs of images with different dates. Those inputs are processed to form a new image and displayed, the areas are compared afterwards. The menu of Vegetation Changes is represented in Figure 9.

Figure 9:Vegetation Changes

Experiment was carried out by examining some functions in NDVI Tools menu and Vegetation Changes menu. Band Composite was conducted by combining three Band inputs and putting color intensity over those Bands. Those

three Band inputs are Near Infrared Band, Red Band, and Blue Band. The colors displayed are dominant rather than the other objects, it makes Mangrove objects easily recognized. The process of Band Composite is depicted in Figure 10a.

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(b)

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Figure 10: Composite (a) NDVI (b) NDVI Threshold (c)

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526 Figure 11: Mangrove Coverage Area

Mangrove coverage area is displayed by using the unit of hectare. Figure 11 shows Mangrove coverage area in Ngurah Rai Grand Forest Park in 15th of April 2015. The showed Mangrove coverage area is classified into several classes of coverage and the results can be seen in Table 4.

Table 4: Coverage Results (15 April 2015).

Classifications Result

Very Rare 111.15 Hectare

Rare 126.81 Hectare

Medium 164.88 Hectare

Full 976.50 Hectare

The Changes of area is displayed by using the unit of hectare similar to the calculation of Mangrove forest coverage area. Figure 12 represents the changes of Mangrove coverage area occurring in 21st of March 2003 and 15th of April 2015.

Figure 12: Mangrove Coverage Changes

The area calculation conducted in 21st of March 2003 required inputs of images obtained from Landsat 7 satellite, while The area calculation conducted in 15th of April 2015 required inputs of images obtained from Landsat 8 satellite. By referring to Table 1, the wave of Near Infrared in Landsat 7 was captured by sensor Band 4 and the wave of Visible Red was captured by sensors Band 3. Further explanations are presented in Table 5, it includes the inputs and the results of area calculation.

Table 5: Mangrove Coverage Changes

Date Band Inputs Mangrove

Coverage

15 April 2015

Band 5 & Band 4 (Landsat 8 OLI)

1379,34 Ha

21 March 2003

Band 4 & Band 3 (Landsat 7 ETM+)

1008,63 Ha

Based on the explanations given in Table 5, it can be stated that Mangrove forest in Ngurah Rai Grand Forest Park undergoes a coverage of area which is 1008.63 hectares into 1379.34 hectares.

4. CONCLUSIONS

The area calculation and the shift of Mangrove forest coverage area administered by using NDVI transformation method are effective since Mangrove vegetation in Ngurah Rai Grand Forest Park spreads widely and homogenously. To facilitate the area calculation and shift, Matlab language programming-based application was constructed. This application requires image input which is originated from Landsat satellite. This image input was used in this research administered in 21st of March 2003 and 15th of April 2015. The Mangrove coverage area in 2015 is 1379.34, while it is only 1008.63 in 2003, it can be stated that there is area alteration as much as 370.71 hectares. Therefore, it can be concluded that Mangrove coverage in Ngurah Rai Grand Forest Park increases as much as 370.71 hectares within 12 years.

5. FURTHER RESEARCH DIRECTION

Vegetation analysis using Vegetation Index transformation is not limited to the use of NDVI method, it is expected that the development of this application does not focus on NDVI method and Mangrove forest only. The selection of Vegetation Index method should be conformed to the kinds of vegetation, whether the vegetation is heterogeneous or homogeneous.

ACKNOWLEDGEMENT

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527 assistance this research.

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