بررسی روند تغییرات پوشش اراضی با استفاده از تکنیک سنجش از دور (مطالعه موردی، تحت واحد کتالان)
الموضوعات :
مریم ناظمی جلال
1
(دانش آموخته مقطع کارشناسی ارشد محیط زیست (ارزیابی و آمایش سرزمین)، دانشگاه پیام نور، تهران، ایران. )
مرضیه علی خواه اصل
2
(استادیار، گروه کشاورزی و منابع طبیعی، دانشگاه پیام نور، تهران، ايران.)
الهام فروتن
3
(استادیار، گروه کشاورزی و منابع طبیعی، دانشگاه پیام نور، تهران، ایران.)
الکلمات المفتاحية: کتالان, سنجش از دور, طبقه¬بندی نظارت¬شده, پوشش اراضی.,
ملخص المقالة :
زمینه و هدف: استفاده و مدیریت بهینه یک سرزمین نیازمند اطلاعات بهنگام و درست می¬باشد. یکی از مهمترین منابع اطلاعاتی در مدیریت منابع طبیعی، نقشه¬های پوشش اراضی است. هدف از انجام این پژوهش، تهیه نقشه¬های پوشش اراضی منطقه کتالان برای بررسی تغییرات صورت گرفته طی 12 سال گذشته می¬باشد. روش بررسی: در انجام این تحقیق داده¬های ماهواره لندست سنجنده OLI سال 2013 و سنجنده ETM سال 2001 به¬کارگرفته شد و پس از انجام تصحیحات لازم بر روی تصاویر، از GPS و نقشه¬های توپوگرافی به منظور بازدید صحرایی منطقه و برداشت نقاط تعلیمی، استفاده شده ¬است. نقشه¬های پوشش اراضی با استفاده از روش¬ طبقه¬بندی نظارت¬شده با الگوریتم حداکثر احتمال تهیه گردید. یافته¬ها: بر اساس نتایج به¬دست آمده، منطقه مورد مطالعه دارای 6 طبقه شامل: اراضی زراعی آبی، اراضی زراعی دیم، اراضی زراعی رها شده، رخنمون سنگی، مرتع و معدن می¬باشد. دقت کلی و ضریب کاپا برای نقشه پوشش اراضی سال 2013، به ترتیب برابر 11/86% و 82/0و برای سال 2001 به ترتیب برابر با 26/78% و 71/0 به¬دست آمد. بحث و نتیجه¬گیری: نتایج تحقیق نشان می¬دهد که اراضی زراعی آبي، اراضی رها شده و طبقه مرتع از سال 2001 نسبت به سال 2013 به ترتیب 84/1 % و 29/1 % و 21/1% افزایش سطح داشته¬¬است و کلاس اراضی زراعی دیم و برو¬¬ن¬زد سنگی به ترتیب 09/5 % و 62/0% کاهش یافته¬است. همچنین طبقه معدن در سال 2001 وجود نداشته و در سال 2013، 3939/49هکتار معادل 36/1 درصد از مساحت منطقه را به خود اختصاص داده¬¬است.
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