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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">geomorf</journal-id><journal-title-group><journal-title xml:lang="ru">Геоморфология и палеогеография</journal-title><trans-title-group xml:lang="en"><trans-title>Geomorfologiya i Paleogeografiya</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2949-1789</issn><issn pub-type="epub">2949-1797</issn><publisher><publisher-name></publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31857/S2949178923030106</article-id><article-id custom-type="edn" pub-id-type="custom">WDVKDT</article-id><article-id custom-type="elpub" pub-id-type="custom">geomorf-3343</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Методы исследований</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Research methods</subject></subj-group></article-categories><title-group><article-title>Спектральный анализ рельефа с построением нейронной сети для решения поисковых задач на примере горного массива Лук-Тьен (Северный Вьетнам)</article-title><trans-title-group xml:lang="en"><trans-title>Spectral analysis of land surface with the construction of a neural network for gems search on the example of the Luk Tien mountain range (Northern Vietnam)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сергеев</surname><given-names>И. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Sergeev</surname><given-names>I. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>St. Petersburg</p></bio><email xlink:type="simple">igorsergeev.spb@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кукса</surname><given-names>К. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuksa</surname><given-names>K. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>St. Petersburg</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Глебова</surname><given-names>А. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Glebova</surname><given-names>A. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>St. Petersburg</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>St. Petersburg State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>19</day><month>09</month><year>2023</year></pub-date><volume>54</volume><issue>3</issue><fpage>138</fpage><lpage>149</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Сергеев И.С., Кукса К.А., Глебова А.Б., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Сергеев И.С., Кукса К.А., Глебова А.Б.</copyright-holder><copyright-holder xml:lang="en">Sergeev I.S., Kuksa K.A., Glebova A.B.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://geomorphology.igras.ru/jour/article/view/3343">https://geomorphology.igras.ru/jour/article/view/3343</self-uri><abstract><p>Территория исследования расположена на севере Вьетнама в провинции Йенбай и представляет собой крупный (14.5 × 6.5 × 0.8 км) структурно-денудационный останец на периферии сильного расчлененного низкогорья Кон Вой, а также склоны и днища прилегающих речных долин. Для территории известны проявления камнесамоцветной минерализации в виде жильных образований в толщах мраморов. Район относительно труднодоступен для полевых изысканий, поэтому для предварительной оптимизации проведения геолого-поисковых работ стояла задача на основе анализа имеющейся геолого-геоморфологической информации получить данные о возможной локализации участков полезной минерализации. Для этого методом дискретного преобразования Фурье был рассчитан амплитудный спектр расчленения рельефа для участков, связанных с жильными геологическими образованиями в приповерхностной части мраморных толщ. Бинарная классификация (на потенциальные участки с полезной минерализацией и без нее) полученных числовых показателей амплитуд высот, отвечающих гармоническим колебаниям разных пространственных частот, осуществлена с помощью простой нейронной сети – двухслойного персептрона. Расчетный алгоритм был реализован на языке Python. Применение данной методики позволило выполнить прогноз на рубиново-шпинельную минерализацию в коренном залегании на изучаемую площадью более 200 км2. Полевыми исследованиями в 2019 г. выполнена заверка прогнозных данных, заключающаяся в минералогическом и геохимическом опробовании доступной части спрогнозированных точек. Получена оценка прогнозной силы использованной методики: каждый третий (~35%) спрогнозированный нейронной сетью участок фактически содержит коренные источники рубинов и шпинелей на рассмотренной территории.</p></abstract><trans-abstract xml:lang="en"><p>The study area is located in the north of Vietnam in the province of Yen Bai and it is a large (14.5 × 6.5 × 0.8 km) structural and denudational butte on the periphery of high-dissected low mountains Con Voi, and they are also slopes and bottoms of the neighbor rivers valleys. There are a lot of gemstone outcrops on the territory related with the vein formations in the strata of marbles. The area is relatively difficult to access for geological fieldworks. Therefore, in order to organize and conduct field geological prospecting work, the task was to obtain preliminary data on the possible localization of useful mineralization areas based on the analysis of available geological and geomorphological information. For the task, the spectral regularities of the land surface dissection spatially associated with veined geological formations in the near-surface part of the marble strata were studied, we used the discrete Fourier transform for this. The binary classification (for classes of potentially useful and useless areas) of the elevation amplitudes according with different spatial frequency of topographic dissection was provided with the simple neural network – two-layer perceptron. This algorithm is implemented on the basis of the scientific analysis libraries of the Python. The application of this technique made it possible to carry out a prediction for ruby-spinel mineralization in bedrock over a study area of more than 200 km2. Fieldworks in 2019 verified the predicted data by the ways of mineralogical and geochemical testing of the accessible part of the predicted points. An average estimate of the predictive strength of the method used was obtained as 35% – every third site predicted by the neural network actually contains the primary sources of rubies and spinels in the territory under consideration.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>двумерное спектральное преобразование рельефа</kwd><kwd>поисковая геоморфология</kwd><kwd>морфометрические методы</kwd><kwd>машинное обучение</kwd><kwd>ГИС</kwd><kwd>ЦМР</kwd></kwd-group><kwd-group xml:lang="en"><kwd>2D spectral terrain decomposition</kwd><kwd>search geomorphology</kwd><kwd>morphometric methods</kwd><kwd>machine learning</kwd><kwd>GIS</kwd><kwd>DEM</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы выражают огромную признательность П.Б. Соколову за оказанную помощь в организации и проведении полевых работ. Отдельная благодарность господину Г.А. Гуссиасу (G.A. 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