Calculation of plant coverage index for space image taken from landsat8 satellite

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Calculation of plant coverage index for space image taken from landsat8 satellite

Introduction to vegetation:

Vegetation is all plants that cover and cover the surface of the earth and include trees, shrubs or small or large wild plants, algae and lichens, which originated naturally or for a human, which is the most important component of the environment, it is the outlet of the earth and a source of food for all living organisms, and produces oxygen gas (O2) necessary to breathe all forms of organisms through the process of photosynthesis using solar energy and absorption of carbon dioxide gas and preventing global warming,  Rid the atmosphere of toxic gases, dust and harmful waste, and maintain the cycle of mineral and racist elements in the soil and enrich them and prevent their erosion

 Drifting and repelling the wind, as well as being the source of food for humans and fodder for pets and wild animals, vegetation in any region is the biological factor that affects the species of animals and their presence in them.

The composition and geographical distribution of vegetation is the result of the interaction of a range of environmental factors that form the basic elements in the drawing of the plant image, most notably the climate, soil and topography, as plants vary depending on climate change and soil variation and both climate and soil are greatly affected by terrain, the type of soil under the same climatic conditions varies in origin depending on its location from severe declines or in flat ground.

Remote sensing is a highly efficient economic means of collecting information on land covers, and remote sensing has become even more so that information about vegetation and its health can be obtained and its stages of growth can be followed through multi-band visuals. Plant evidence in detecting change in the state, health and density of vegetation included different wavelengths.

1-Add Band 4 and Band 5 and integrate with the tool composite.

  1. From the processing window we choose the NDVI icon

A new layer is formed in which negative values indicate water, clouds and values

 {0:0.1} denotes rocks and barren land, and vegetation is determined by values {0.2:1} 

Calculation of plant coverage index for space image taken from landsat8 satellite

3-We identify the study area and here the city of Aleppo was taken in addition to the countryside, and is determined by drawing shape from the drawing window and then we save the shape through this window.

Calculation of plant coverage index for space image taken from landsat8 satellite

4-Our study area layer, which has been roughly selected, is produced as follows in the attached image:

Calculation of plant coverage index for space image taken from landsat8 satellite

5-From a window( arctoolbox) We choose the tool( Extract by mask)

Calculation of plant coverage index for space image taken from landsat8 satellite

6-We pull the NDVI_composite and limit layer and the new layer is named as in the attached image and we work on the environments icon

Calculation of plant coverage index for space image taken from landsat8 satellite

7-Our Environment Settings menu and the drop-down menu of the Processing Extent option show us choosing same as layer limit_of_aleppo as our border label as in the following picture:

Calculation of plant coverage index for space image taken from landsat8 satellite

8-We reclassification by previous values:

Calculation of plant coverage index for space image taken from landsat8 satellite

Calculation of plant coverage index for space image taken from landsat8 satellite

9-We introduce the following values to the boundaries of the areas:

Calculation of plant coverage index for space image taken from landsat8 satellite

10-Our result shows:

Calculation of plant coverage index for space image taken from landsat8 satellite

Where green is the indicator of plant coverage.

11. We’ll calculate the area of the green areas by creating a column within the attribute table metadata for the layer and call it area, and then calculate the area by field calculator and enter the equation that multiplies the number of pixels by one pixel:

Calculation of plant coverage index for space image taken from landsat8 satellite

Count*900

12.Add the new field as follows:

Calculation of plant coverage index for space image taken from landsat8 satellite
Calculation of plant coverage index for space image taken from landsat8 satellite

The green land area is approximately 16 square kilometers.

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