نوع مقاله : پژوهشی
نویسندگان
1 استاد گروه جغرافیای طبیعی، دانشکده علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 کارشناسی ارشد سنجش ازدور و سیستم اطلاعات جغرافیایی، دانشکده علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل، ایران
چکیده
با توجه به ثبت جنگلهای هیرکانی در یونسکو، امروزه آگاهی از تغییرات و روند تخریب اراضی جنگلی جهت برنامهریزی و مدیریت اراضی ملی امری ضروری است. هدف از این پژوهش، پایش تغییرات کاربری اراضی و پوشش جنگلی در شهرستان آستارا با استفاده از تصاویر ماهوارهای سری لندست سنجندههای TM, OLI 1 & 2 مربوط به سالهای 1995 و 2022 است. در این پژوهش ابتدا تصاویر در روزهای با پوشش ابر کمتر از 10 % در سه بازه زمانی، در دو دوره انتخاب، سپس بر اساس روابط بین باندی شاخص پوشش گیاهی EVI تعریف شد. در ادامه با ترکیب شاخصها نسبت به استخراج نقشه کاربری اراضی با استفاده از الگوریتم ماشین بردار پشتیان اقدام شد. نتایج ارزیابی صحت نشان داد که دقت کلی و ضریب کاپا نقشه کاربری اراضی با استفاده از الگوریتم ماشین بردار پشتیبان برای سالهای 1995 و 2022 به ترتیب برابر با 89، 92 % و 0/86 و 0/75 است. نتایج بررسی تغییرات در شهرستان آستارا در بازه زمانی 1995 تا 2022 نشان داد که کاربری مسکونی به میزان 7 % یعنی 2954 هکتار افزایش یافته در مقابل کاربری اراضی مرتعی و کاربری اراضی کشاورزی به ترتیب 1 و 2 % به میزان 258 و 997 هکتار کاهش یافتهاند؛ اما یکی از کاربریهای مهم کرانه خزری، پوشش جنگلی در سال 1995 دارای مساحت 34283 هکتار بوده است که 80 % سطح پوشش منطقه مورد مطالعه را در بر گرفته که در سال 2022 سطح این کاربری به 32522 هکتار برابر با 76 % میرسد که به میزان 4 درصد برابر با 1761 هکتار کاهش یافته است. بر مبنای یافتههای این پژوهش میتوان اظهار نمود که سامانه گوگل ارث انجین با آرشیوی از تصاویر ماهوارهای مختلف میتواند به عنوان یک ابزار قوی و مناسب جهت پایش و مدیریت اراضی جنگلی باشد.
کلیدواژه‌ها
عنوان مقاله [English]
Remote Sensing Used to Detect Changes in Land Use and Forest Cover (A Case Study of Astara City)
نویسندگان [English]
- sayyad Asghari Saraskanrood 1
- Hosein Sharifi Tolaroud 2
1 Professor, Department of Physical geography, Faculty of Social Sciences, University of Mohaghegh Ardabili, Iran.
2 Msc in Remote Sensing & Gis, Faculty of Social Sciences, Mohaghegh Ardabili University, Ardabil, Iran.
چکیده [English]
Given the significance of the Hyrcanian Forests, inscribed by the UNESCO as a world heritage site, it is essential to monitor the changes in and the devastation of the forest cover in this ecoregion for the planning and management of national lands. It is the objective of the present study to monitor changes in both land use and forest cover in Astara region using Landsat TM, OLI 1 & 2 sensors for the years 1995 and 2022. For this purpose, images captured on days with cloud covers of less than 10% were selected over three time intervals and the relevant enhanced Vegetation Index (EVI) values were determined based on Landsat inter-band relations. In the next stage, the index values were combined to derive the land use map using the support vector machine (SVM) algorithm. The results of accuracy evaluation showed that the overall accuracy and Kappa coefficients of the land use map for the year 1995 were equal to 89 and 92% and those for 2022 were 0.86 and 0.75%, respectively, indicating acceptable results. The results of land use changes in Astara city during the period from 1995 to 2022 showed that residential land use had increased by 7% equal to 2954 ha while rangeland and agricultural uses had decreased by 1 to 2% equal to 258 and 997 ha, respectively. However, an important land use along the Caspian coast line – that is, forest cover - stretched over an area of 34283 ha equal to 80% of the study area, which declined in 2022 to 32522 ha equal to 76%, showing a decrease of 4% equal to 1761 ha. It is clear that, owing to its rich archive of satellite images, the GEE system can be used as a strong and useful tool for monitoring and managing forest lands.
کلیدواژه‌ها [English]
- Forest cover
- Deforestation
- Google Earth Engine
- Landsat
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