Remote Sensing and GIS Applications in Environmental Sciences

Evaluating the changes of land cover and land surface temperature in the western margin of Rig Boland using Landsat satellite images

Document Type : Original Article

Authors

1 Ph.D. Student, Department of management and control of Arid Lands, Faculty of Natural Resources and Earth Sciences, University of Kashan, Kashan, Iran

2 Associate Professor, Department of Geography and Tourism, Faculty of Natural Resrources and Earth Sciences, University of Kashan

10.22034/rsgi.2026.70900.1154

Abstract

this study investigated changes in land cover and surface temperature classes on the western edge of Rig Boland. Landsat satellite data, TM, ETM+ and OLI sensors were used to monitor landuse and temperature trends. The criterion for assessing landuse is the supervised classification using the maximum likelihood method, and for calculating the surface temperature, the spectral radiance of thermal bands is converted to LST. Results showed 6 KM2 of agricultural lands has been converted into man-made areas, 68 KM2 of ranges and sand dunes to agriculture, 40 KM2 of man-made forest to ranges, and 7 KM2 of ranges to bare lands. These changes have a direct impact on surface temperature increase, which in turn affects the ecosystem service efficiency. So, it has caused some of region's lands to become centers of dust storms. Also, due to desilting activities on Rig Boland edge with aim of quicksand stabilizing, an area of 82 KM2 of ranges and sand dunes has been converted into man-made forest. These changes have a direct effect on temperature decrease and have caused quicksand to stabilize in part of the region, which indicates the positive performance of desertification projects. Results of temperature monitoring showed the temperature zones below 35° is decreasing and the area of temperature zones above 40° is increasing. This trend indicates an increase in temperature, especially in maximum. this increase has occurred as a result of global warming, and the other part is related to changes in the landcover of natural zones to anthropogenic uses.

Keywords

Main Subjects

تغییر کاربری ارضی به واسطه توسعه پهنه‌های انسان‌ساخت، منجربه تغییرات در دمای سطح زمین می‌شود. این تغییرات در نواحی خشک و نیمه‌خشک، به ویژه در حاشیه ریگزارها سبب برهم زدن تعادل اکولوژیک اکوسیستم‌های طبیعی می‌شود که ارزیابی آن از الزامات مدیریتی است. لذا این پژوهش، به بررسی تغییرات پوشش ارضی و طبقات دمای سطح زمین در حاشیه غربی ریگ بلند پرداخته است. برای پایش کاربری ارضی و روند تحولات دما، از داده‌های ماهواره لندست، سنجنده‌های TM، ETM+ و OLI استفاده شد. ملاک برای ارزیابی کاربری ارضی، طبقه‌بندی نظارت‌شده به روش حداکثر احتمال، و برای محاسبه دمای سطح زمین تبدیل رادیانس طیفی باندهای حرارتی به درجه حرارت سطحی است. نتایج نشان داد 6 کیلومترمربع از اراضی کشاورزی به پهنه‌های انسان‌ساخت، 68 کیلومترمربع از مرتع و تپه‌های ماسه‌ای به کشاورزی، 40 کیلومترمربع از جنگل دست‌کاشت به مرتع و 7 کیلومترمربع از مرتع به پهنه‌های بدون پوشش تبدیل شده است. این تغییرات تأثیر مستقیمی بر افزایش افزایش دمای سطحی دارد که به تبع آن بر کیفیت بازدهی خدمات اکوسیستم نیز اثر می‌گذارد. از طرفی سبب شده تا بخشی از اراضی منطقه به کانون ریزگردها و پهنه‌های مستعد رخداد طوفان‌های گرودغبار تبدیل شود. همچنین به واسطه فعالیت‌های بیانزدایی در حاشیه ریگ بلند با هدف تثبیت ماسه‌های روان، وسعت 82 کیلومترمربع از مراتع و تپه‌های ماسه‌ای به جنگل دست‌کاشت تبدیل شده‌است. این تغییرات اثرات مستقیم بر کاهش دما دارد و باعث شده تا ماسه‌های روان در بخشی از منطقه ثبیت شود که حاکی از عملکرد مثبت طرح‌های بیابانزدایی دارد. نتایج پایش دما نیز نشان داد مساحت پهنه‌های دمایی کمتر از 35 درجه سیر نزولی و پهنه‌های دمایی بالای 40 درجه سیر صعودی دارد. این روند نشان از افزایش دما به‌خصوص در دماهای حداکثری دارد. بخشی از این افزایش در اثر گرمایش جهانی به وقوع پیوسته و بخش دیگر آن وابسته به تغییرات پوشش ارضی پهنه‌های طبیعی به کاربری‌های انسان‌ساخت است.

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Remote Sensing and GIS Applications in Environmental Sciences
Volume 6, Issue 19
July 2026
  • Receive Date: 28 December 2025
  • Revise Date: 25 January 2026
  • Accept Date: 31 January 2026