Using satellite images to study temperature changes and vegetation in YASOUJ (last twenty years 2000 - 2020
Subject Areas : Journal of Radar and Optical Remote Sensing and GIS
1 - سازمان آموزش و پرورش شهرستان صدوق .یزد
2 - Geography and Urban Planning, Islamic Azad University, Yazd, Iran
Keywords: Satellite images, vegetation, temperature, YASOUJ city,
Abstract :
Awareness of the process of environmental change, which has intensified due to extensive human activities, and now, the use of satellite imagery to study environmental and spatial changes is known as the best example for detecting and evaluating changes. Because with the advances made in this technology and the production of satellite images with high spectral and spatial resolution, as well as various image processing techniques, environmental and spatial changes can be estimated and managed. In this study, changes are examined. Temperature (day and night) and vegetation of YASOUJ city, which is in a period of 20 years, and for this purpose, using software (Giovanni NASA) and (Google earth) to capture satellite images in four five-year periods (2020 - 2000) has been done. According to the research and studies were done from the current research, there is a phenomenon (global warming) and our planet due to our activities as humans, we have caused global warming and over time this trend is intense and strong. It takes more. The intensity of temperature changes in urban environments is more.
Using satellite images to study temperature changes and vegetation in YASOUJ (last twenty years 2000 - 2020)
Writers:
* Ali Akbar Jamali (Associate Professor, GIS-RS and Watershed Management Department, MEYBOD Branch, Islamic Azad University, MEYBOD, Yazd, Iran (jamaliaa@iauyazd.ac.ir)
SAJAD Jalil (Ph.D. Student in Geography and Urban Planning, Yazd Branch, Islamic Azad UNIVERCITY, Yazd, Iran (Sajad.Jalil2015@gmail.com)
Alireza Nouri (Ph.D. Student in Geography and Urban Planning, Yazd Branch, Islamic Azad University, Yazd, Iran (Alireza.nouri1983@gmail.com)
Abstract
Awareness of the process of environmental change, which has intensified due to extensive human activities, and now, the use of satellite imagery to study environmental and spatial changes is known as the best example for detecting and evaluating changes. Because with the advances made in this technology and the production of satellite images with high spectral and spatial resolution, as well as various image processing techniques, environmental and spatial changes can be estimated and managed. In this study, changes are examined. Temperature (day and night) and vegetation of YASOUJ city, which is in a period of 20 years, and for this purpose, using software (Giovanni NASA) and (Google earth) to capture satellite images in four five-year periods (2020 - 2000) has been done. According to the research and studies were done from the current research, there is a phenomenon (global warming) and our planet due to our activities as humans, we have caused global warming and over time this trend is intense and strong. It takes more. The intensity of temperature changes in urban environments is more.
Keywords: Satellite images, vegetation, temperature, YASOUJ city
Introduction
The land cover land use information is essential for managing natural resources and monitoring environmental change. Land-use changes and land cover have contributed to rising ground temperatures. The diversity of different types of land use can be studied according to the difference in their surface temperature (WICHANSKY et al, 2008; WENG et al, 2007). Today, due to changes and conversions of vegetation surfaces to impermeable surfaces, an increase in temperature level is observed (RAMCHADRA AND KUMAR, 2010). These changes affect the absorption of solar radiation, surface temperature, evaporation rate, heat storage, and wind turbulence and can significantly change the atmospheric conditions near the surface (OLUSEY et al, 2011). The Earth has formed a rotation in the local climate in the direction of global climate change. (TERENBERTH et al, 2007; HOUGHTON et al 2001) Vegetation changes over time due to natural or human factors that affect the condition and function of ecosystems. Therefore, the need to detect, predict and monitor such changes in an ecosystem is very important (PETTORELL et al. 2005). Earth surface temperature is an important parameter that can indicate changes in the earth's surface. Recently, this parameter has become more prominent in studies of climate change, global warming, environmental phenomena such as agricultural drought, and the study of urban heat islands (NETELER, 2010). Earth's surface temperature is a function of net energy at the earth's surface, which depends on the amount of energy reaching the earth's surface, surface emissions, humidity, and atmospheric airflow (CHENG, XIAOLU, 2011. Temperature is one of the basic elements in climate formation; its changes can structure Transform the climate of any place, which is why the study of temperature trends in different time and space scales has been a large part of the literature and climatology (MASOUDIAN, 1383: 29). The country and the world (AZIM et al, 2011) in a study entitled Ground temperature response to land use dynamics and land cover concluded that the analysis of land surface temperature with land use and land cover, a significant negative correlation between Vegetation index and land surface temperature show (YAN et al, 2008) The study of 16-day NDVI values in mountainous areas of China's Tianshan Mountains shows a high correlation between plant growth and temperature and precipitation factors, and temperature is a more effective factor than Rainfall is a change in plant growth (GUNGLEI et al, 2011). Dynamics of vegetation and its relationship with climatic factors in natural reserves They studied QANGABI in China. The effect of climate change on vegetation growth showed that air temperature should be used as an indicator of vegetation sensitivity in the study area. The purpose of this study was to investigate temperature changes and vegetation in the study area and the factors affecting These changes can be provided by providing solutions to solve the problem in the urban study area of YASOUJ.
materials and methods
area of study
The city of YASOUJ, the capital of KOHGILUYEH and Boyer-Ahmad Provinces, is located in the geographical coordinates of 30 degrees 28 minutes north latitude and 51 degrees 36 minutes east longitude. The main source is the Karun River. Figure (1)
research method
To study the temperature changes (day and night) and vegetation of YASOUJ city using two software (GIVANNI NASA), (google earth) to prepare satellite images of the study area in the last twenty years in four five-year periods from the Year 2000 to 2020 AD. First, satellite images (temperature and vegetation) of YASOUJ city were extracted from the software (GIVANNI NASA) and placed in the software (Google Earth) and spatial and environmental information of the region. The case study was harvested and used in research.
Results and discussion
Daily temperature map
Satellite images that have been prepared with the help of software (Giovanni NASA) are well indicative of the phenomenon (temperature increase) or (global warming) that the main cause of this factor can we (humans), which today with the passage of time and Increasing use of fossil fuels, which are the cause of various pollutants in the air, has caused global warming. Cities are more visible as the center of gravity of activities and human concentrations. is not.
Figure 2 Daily temperature map
Green areas are areas where nighttime temperatures have risen over time (years).
Night temperature map
The process of global warming, which is progressing rapidly and has also affected the night temperature. On the other hand, by examining the satellite maps taken from the software system (GIOVANNI NASA) from YASOUJ urban area, in four five-year periods from 2000 to 2020, it well shows the change in night temperature. The study area is getting warmer at night.
Figure 3 Night temperature map
The direction of the arrows indicates the intensity range of the night temperature change in the study area, which is expanding in the study of satellite images.
Vegetation map
With the studies of vegetation maps in four five-year periods (2000-2020), there is a noticeable change in vegetation in the study area of YASOUJ, vegetation changes are a positive and expanding trend in the region. Has had.
Figure 4 Vegetation map
Vegetation cover (2020 - 2015) Areas of vegetation expansion in the region are marked by red rectangles and in the years (2005-2005) the areas marked with green circles are vegetation. Has decreased.
Conclusion
• The daily temperature in the study area of YASOUJ urban area is increasing and due to human and natural factors, the temperature has increased.
• The history of night temperature in the study area of YASOUJ has been increasing, which depends on human and natural factors.
Vegetation in the study area of YASOUJ urban in the twenty years (2000-2002) has a good and growing cover trend.
Solutions and suggestions
• Today, solutions have been presented at the level (regional, national, global) to deal with the trend (global warming). At the national level, land protection and vegetation
• Protection and supervision of relevant organizations in the management of natural resources and the people in the maintenance of vegetation
• Reduction of destructive industrial activities that are the main cause of harmful gases in the atmosphere and cause global warming.
• Awareness and awareness of people to manage and preserve the environment
• Using clean fuels instead of fossil fuels (gasoline – diesel)
• Planting trees and various vegetation
• At the global level. Solutions such as spraying the ozone layer - using sunglasses for the ground - making artificial trees, etc. are methods that have not yet been put forward as a theory and the color of reality, which if implemented can be It was hoped that the phenomenon of global warming could be eliminated.
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