طبقه‌بندی تصاویر چندطیفی با قدرت تفکیک مکانی متوسط، با استفاده از شاخص‌های مکانی و حرارتی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 استادیار گروه سنجش از دور و سیستم اطلاعات جغرافیایی، دانشگاه تربیت مدرس، تهران

2 دانشجوی کارشناسی ارشد سنجش از دور و سیستم اطلاعات جغرافیایی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران

چکیده

در طبقه‌بندی تصاویر با قدرت تفکیک مکانی متوسط، مانند لندست، تمایز اراضی کشاورزی بدون پوشش گیاهی از زمین‌های بایر و همچنین، شناسایی زمین‌های بایر از مناطق ساخته‌شده معمولاً دشوار و همراه با خطاست. به همین علت در این مطالعه، ترکیب‌های متفاوتی از ویژگی‌های ورودی، به‌روش‌های طبقه‌بندی، به‌منظور بررسی امکان ارتقای دقت طبقه‌بندی مقایسه شد. داده‌های ورودی شامل باندهای طیفی تصویر لندست-7، ویژگی‌های بافتی شامل ماتریس وقوع هم‌زمان گام‌های خاکستری و شاخص‌های حرارتی و مکانی پیشنهادی در این تحقیق است. در بررسی حاضر، به‌منظور طبقه‌بندی سناریوهای متفاوت، از سه روش طبقه‌بندی شامل بیشترین میزان شباهت، شبکة عصبی و ماشین بردار پشتیبان با هسته‌های متفاوت استفاده شد. نتایج نشان داد که ادغام تمامی داده‌های ورودی و استفاده از روش ماشین بردار پشتیبان با هستة پایة شعاعی، با صحت کلی 81/۹۸% و ضریب کاپا 25/98%، ممکن است نتایجی بهتر از دیگر روش‌ها و سناریوها داشته باشد. همچنین، در تحلیل اهمیت متغیرهای ورودی، با استفاده از روش انتخاب ویژگی برپایة جنگل تصادفی، مشخص شد که شاخص‌های پیشنهادی در این مطالعه نقش مهمی در طبقه‌بندی با صحت بالا و کارآمد داشته‌اند.

کلیدواژه‌ها

عنوان مقاله [English]

Medium Spatial Resolution Image Classification Based on Spatial and Thermal Indices

نویسندگان [English]

  • A Shamsoddini 1
  • Sh Esmaeili 2
1 Assistant Prof., Dep. of Remote Sensing and GIS Tarbiat Modares University, Tehran
2 M.Sc. Student, Dep. of Remote Sensing and GIS, Islamic Azad University, Science and Research branch, Tehran
چکیده [English]

Differentiating agricultural areas which are not covered by vegetation from bare lands as well as identifying bare lands from urban areas in medium spatial resolution images, e.g. Landsat imagery, are usually difficult and erroneous tasks which lead to the inaccurate classification results. Therefore, this study aims to present a new approach to increase the accuracy of the classification. For this purpose, different scenarios were applied based on different input attributes. The input attributes comprised of spectral bands, textural attributes, i.e. grey level co-occurrence matrix (GLCM), and two types of indices including spatial and thermal attributes proposed in this study. Three classification methods, maximum likelihood (ML), artificial neural networks (ANN), and support vector machine (SVM) embedded with different kernels, were applied to examine different scenarios. The results showed that SVM algorithm embedded with Radial basis function (RBF) results in better accuracy, with overall accuracy of 98.81% and Kappa coefficient of 98.25%, when all types of input attributes were combined together. Finally, the variable importance analysis by random forest feature selection indicated that the proposed indices played an important role to execute more efficient classification by SVM.

کلیدواژه‌ها [English]

  • Landsat 7
  • Random forest
  • Textural information
  • Spatial index
  • Brightness temperature
  • Support vector machine

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