تخمین میزان آهک خاک در کانون های گردوغبار با استفاده از طیف سنجی VNIR و تصاویر ماهواره ای سنجنده OLI
محورهای موضوعی : توسعه سیستم های مکانیموسی قاضی 1 , حسینعلی بهرامی 2 , علی درویشی بلورانی 3 , سهام میرزایی 4
1 - دانشجوی کارشناسی ارشد خاکشناسی، دانشگاه تربیت مدرس
2 - دانشیار دانشکده کشاورزی، دانشگاه تربیت مدرس
3 - استادیار دانشکده جغرافیا، دانشگاه تهران
4 - دانشجوی دکتری سنجش از دور و GIS، دانشگاه تهران
کلید واژه: لندست, شاخص, طیف سنجی VNIR, آهک خاک, رگرسیون حداقل مربعات جزئی (PLSR),
چکیده مقاله :
یکی از بزرگترین چالش های عصر حاضر تخریب خاک و به دنبال آن تخریب سرزمین می باشد. یکی از عوامل تخریب خاک در کانون های گردوغبار، کیفیت پایین تغذیۀ خاک به عنوان بستر رشد و توسعه پوشش گیاهی می باشد. آهک یکی از عواملی اصلی کاهش کیفیت تغذیه ای خاک می باشد. زمان بر و پرهزینه بودن روش آزمایشگاهی تخمین آهک خاک، بررسی روش های سریع و غیرمخرب مانند تصاویر ماهواره ای و طیف سنجی VNIR را ضروری می نماید. در این پژوهش 29 نمونه خاک دست نخورده هم زمان با تصویربرداری ماهوارۀ لندست 8 از دو کانون برداشت گردید. این نمونه ها در سه حالت، IMS، IDS و SMD طیف سنجی شدند. میزان آهک نمونه های سطحی و مخلوط در آزمایشگاه اندازه گیری شد. از روش شاخص خاک و روش رگرسیون حداقل مربعات جزئی PLSR برای پردازش داده ها استفاده شد. نتایج روش PLSR برای حالت SMD (30/0=R2 و 84/1=RMSE) و برای حالت های IDS و IMS به ترتیب (0/08، 0/13)=R2، (0/87، 0/85)= RMSE بدست آمد. نتایج روش شاخص RI برای حالت های SMD، IDS و IMS به ترتیب (0/19، 0/29، 0/56= R2و 0/80، 0/75، 1/41=RMSE) به دست آمد که نتایج برای حالت SMD قابل قبول بود. نتایج روش PLSR برای تصویر ماهواره ای 0/84=R2 و 0/34= RMSE به دست آمد. اما نتایج مربوط به استفاده از سه شاخص RI، DI، NDI به ترتیب (0/31، 0/08، 0/28=R2 و 0/74، 0/86، 0/75=RMSE) به دست آمد که نتایج این بخش نسبت به روش PLSR ضعیف و غیرقابل قبول بود. بر این اساس نقشه مربوط به آهک منطقه با روش PLSR تهیه گردید.
In the present age, one of the most important challenges is soil erosion and consequently land degradation. One of the reasons of soil erosion in the source areas of dust is the low quality of nourishing the soil at the base of growth and development of vegetation. Lime is one of the main factors of decreasing the quality of nourishing the soil. Soil’s lime measuring by laboratory method is time consuming and expensive, thus developing the non-destructive and fast methods like the satellite and VNIR spectrometry data is necessary. In this study 29 intact soil samples have been collected on the same day of Landsat 8 satellite’s overpass from two sources. The spectroscopy has been done on these samples in three modes: IMS, IDS, and SMD. The surface and mixed samples lime have been measured in the laboratory. The soil index and PLSR methods have been used for processing data. The results obtained from PLSR method for SMD mode were R2=0.30 and RMSe=1.84 and for IDS and IMS modes were R2=0.13, 0.08 and RMSe=0.85, 0.87 respectively. The results of the RI index for SMD, IDS, and IMS were R2=0.56, 0.29, 0.19 and RMSe=1.41, 0.75, 0.80 respectively, that the results for SMD mode were acceptable. The results of image in PLSR method were R2=0.84 and RMSe=0.34. But the results related to using RI, DI, and NDI indices (R2=0.28, 0.08, 0.31 and RMSe=0.75, 0.86, 0.74, respectively), were unacceptable and weaker than PLSR method. Based on these results the lime map has been produced by using PLSR method.
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