scholarly journals Analyse diachronique grâce aux images Landsat de la dynamique spatiale des forêts sacrées du haut bassin du Niger en république de Guinée

2022 ◽  
Vol 223 ◽  
pp. 250-266
Author(s):  
Fodé Salifou Soumah ◽  
Kouami Kokou ◽  
Mohamed Diakité ◽  
Youssouf Camara ◽  
Sidiki Kourouma ◽  
...  
Keyword(s):  
Landsat Tm

La présente étude porte sur l’analyse diachronique, entre 1986 et 2017, de la dynamique spatiale de 20 forêts sacrées du bassin du Haut Niger en république de Guinée. L’interprétation des images satellites Landsat TM (1986, Landsat OLI/TIRS (2017), ainsi que les relevés de terrain, ont été utilisés. L’étude a révélé que malgré leur caractère sacré, la surveillance des sites forestiers étudiés pose problème. L’analyse diachronique de l’évolution spatiale de chacune des 20 forêts étudiées montre, à l’exception d’un seul site, une tendance régressive de l’ensemble des superficies initiales qui, sont passées de 2 581,10 ha en 1986, à 1 206,6 ha en 2017. Durant les trois décennies, la superficie initiale totale des 20 forêts a diminué de 57,5 % en moyenne, avec un taux annuel moyen de 3,8 %. Cette réduction considérable de la superficie est principalement liée à l’agriculture (63%). La pression démographique, la proximité des villages, l’affaiblissement des systèmes traditionnels de gestion et l’influence de l’islam, sont à l’origine de cette déforestation. La gestion foncière des terres dans les terroirs villageois du bassin est nécessaire pour la sauvegarde de ce patrimoine écologique.

ANALISIS PERUBAHAN PENUTUP LAHAN DAN POLA MATA PENCAHARIAN MASYARAKAT Studi Kasus: Kecamatan Kelapa Kampit, Kabupaten Belitung Timur

2019 ◽  
Vol 3 ◽  
pp. 405
Author(s):  
Emma Rahmawati ◽  
Anang Dwi Purwanto
Keyword(s):  
Landsat Tm ◽  
Landsat 8

Kegiatan penambangan timah di daratan di wilayah Kabupaten Belitung Timur sudah berlangsung sejak lama terutama di wilayah Kecamatan Kelapa Kampit. Banyak penduduknya bekerja sebagai penambang timah, namun kegiatan penambangan tersebut semakin berkurang seiring dengan adanya kebijakan terkait penambangan yang lebih ke arah pelestarian lingkungan dan adanya kegiatan reklamasi dan revegetasi yang dilakukan di lahan pasca tambang timah. Tujuan penelitian ini adalah untuk menganalisis gambaran perubahan penutup lahan dan menganalisis pola matapencaharian di Kecamatan Kelapa Kampit. Data penelitian yang digunakan terdiri dari data primer dan data sekunder. Data primer di antaranya berupa citra satelit Landsat TM akuisisi tahun 1995 dan Landsat 8 akuisisi tahun 2015 serta data hasil wawancara penduduk lokal. Data sekunder berupa data data dari pemerintah daerah setempat, dan lain-lain. Metode pemisahan obyek penutup lahan menggunakan teknik klasifikasi unsupervised (klasifikasi tak terbimbing). Setelah dilakukan proses reclass, maka dihasilkan 8 (delapan) kelas penutup lahan diantaranya: Awan (no data), Hutan, Ladang/Semak, lahan tambang, permukiman, perkebunan dan tubuh air. Analisis deskriptif kualitatif dilakukan untuk melihat hubungan perubahan penutup lahan dengan pola mata pencaharian masyarakat. Hasil penelitian menunjukkan terjadi kondisi yang kontradiktif antara lahan tambang dan hutan dengan lahan perkebunan kelapa sawit. Kondisi luasan lahan tambang dan hutan dari tahun 1994 – 2015 mengalami penurunan, sedangkan luasan lahan perkebunan kelapa sawit mengalami peningkatan yang cukup signifikan. Seiring dengan perubahan penutup lahan tersebut, terjadi penurunan jumlah buruh harian lepas dimana penambang inkonvensional termasuk didalamnya. Terjadi peralihan mata pencaharian yang awalnya mengandalkan penambangan, saat ini menjadi semakin banyak pilihan mata pencaharian yang dapat dipilih oleh masyarakat Kecamatan Kelapa Kampit.

A STUDY ON THE URBANIZATION OF HARBIN AND SHANGHAI BY LANDSAT TM DATA

2005 ◽  
Vol 70 (595) ◽  
pp. 91-96
Author(s):  
Minghao PIAO ◽  
Ikuo SAITO ◽  
Osamu ISHIHARA
Keyword(s):  
Landsat Tm

Landsat TM inventory and assessment of waterbird habitat in the southern altiplano of South America

2004 ◽  
Vol 12 (6) ◽  
pp. 563-573 ◽  
Author(s):  
Terence P. Boyle ◽  
Sandra M. Caziani ◽  
Robert G. Waltermire
Keyword(s):  
South America ◽  
Landsat Tm

scholarly journals Remote Sensing Monitoring of Advancing and Surging Glaciers in the Tien Shan, 1990–2019

2021 ◽  
Vol 13 (10) ◽  
pp. 1973
Author(s):  
Sugang Zhou ◽  
Xiaojun Yao ◽  
Dahong Zhang ◽  
Yuan Zhang ◽  
Shiyin Liu ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Landsat Tm ◽  
Tien Shan ◽  
High Latitudes ◽  
Remote Sensing Images ◽  
Climate Variable ◽  
Mountain Ranges ◽  
Remote Sensing Monitoring ◽  
Change Mechanism ◽  
Temperature And Precipitation

The advancing of glaciers is a manifestation of dynamic glacial instability. Glaciers in the Tien Shan region, especially in the Central Tien Shan, show instability, and advancing glaciers have been recently detected. In this study, we used Landsat TM/ETM+/OLI remote sensing images to identify glaciers in the Tien Shan region from 1990 to 2019 and found that 48 glaciers advanced. Among them, thirty-four glaciers exhibited terminal advances, and 14 glaciers experienced advances on the tributary or trunk. Ten of the glaciers experiencing terminal advances have been identified as surging glaciers. These 48 glaciers are distributed in the western part of the Halik and Kungey Mountain Ranges in the Central Tien Shan, and Fergana Mountains in the Western Tien Shan, indicating that the Tien Shan is also one of the regions where advancing and surging glaciers are active. From 1990 to 2019, a total of 169 times advances occurred on 34 terminal advancing glaciers in the Tien Shan region; the highest number of advancing and surging of glaciers occurred in July (26 and 14 times, respectively). With reference to the existing literature and the present study, the surge cycle in the Tien Shan is longer than that in other regions at high latitudes in Asia, lasting about 35–60 years. Surging glaciers in the Tien Shan region may be affected by a combination of thermal and hydrological control. An increase in temperature and precipitation drives surging glaciers, but the change mechanism is still difficult to explain based on changes in a single climate variable, such as temperature or precipitation.

scholarly journals O ESTUDO DE CASO DA REGIÃO DE COXIM E DA BACIA DO TAQUARIZINHO-MS

2002 ◽  
Vol 51 ◽  
Author(s):  
ANTONIO CONCEIÇÃO PARANHOS FILHO
Keyword(s):  
Landsat Tm ◽  
Mato Grosso ◽  
Mato Grosso Do Sul

O principal objetivo desta pesquisa é o desenvolvimento de um método de trabalho de análise multitemporal, para a avaliação das mudanças ambientais de áreas naturais, ocorridas em um determinado período de tempo. O trabalho foi desenvolvido sobre parte da bacia do Pantanal, no estado do Mato Grosso do Sul, englobando a área de Coxim (correspondente à folha Coxim, 1:250.000- DSG, 1982b - Divisão do Serviço Geográfico do Exército). Foram, ainda, utilizados os dados da Folha Camapuã (1:250.000-DSG, 1982a). A análise multitemporal foi executada em três diferentes momentos: 1966, 1985 e 1996. Os dados de 1966, referentes ao uso dos solos e topografia, foram obtidos da digitalização das cartas do DSG (1:250.000-DSG, 1982 a, b). Os dados de uso e ocupação dos solos 1985 e 1996 foram obtidos a partir da classificação e análise de imagens Landsat TM. Descreve-se ainda todo o processo de obtenção das informações para a criação do banco de dados georreferenciado, utilizado na análise multitemporal, desde a digitalização, classificação da imagens, integração em ambiente SIG até a interpretação final. Além disso, é apresentada uma normatização para a digitalização de cartas, dispensando o uso da mesa digitalizadora. Os resultados foram testados e utilizados na aplicação da Equação Universal de Perdas dos Solos em uma área de teste dentro da base de dados criada (Bacia do Rio Taquarizinho, próxima a Rio Verde do Mato Grosso). Para o tipo de uso do solo foi proposto o uso da legenda desenvolvida pelo projeto Corine (Coordination on Environment – Heymann et al. 1994) da União Européia, que, com as devidas modificações, mostrou-se muito eficaz também no Brasil. Os resultados mostram as mudanças no tipo de uso dos solos, se transformando, principalmente, de sistemas naturais a agropecuários, com conseqüências no aumento da erosão laminar dos solos. As mudanças observadas no tipo de uso do solo da área estudada são grandes. Na década de 60, as matas e cerrados cobriam cerca de 89% da superfície representada pela Folha Coxim. Em 1985 este valor estava reduzido para 30%, alcançando 40% da superfície em 1996. Este desmatamento teve sérias conseqüências para os solos. Com o uso da Equação Universal de Perdas dos Solos, pode-se observar que o desmatamento implicou num aumento de até mais de 50 vezes na taxa de erosão laminar dos solos.

Defining the Landsat TM/ETM+ and CHRIS/PROBA spectral regions in which turbidity can be retrieved in inland waterbodies using field spectroscopy

2014 ◽  
Vol 35 (5) ◽  
pp. 1674-1692 ◽  
Author(s):  
Christiana Papoutsa ◽  
Adrianos Retalis ◽  
Leonidas Toulios ◽  
Diofantos G. Hadjimitsis
Keyword(s):  
Landsat Tm ◽  
Field Spectroscopy

scholarly journals Image Processing Methods of LANDSAT TM Data for Lineament Analysis

1989 ◽  
Vol 1989 (14B) ◽  
pp. 25-39
Author(s):  
Katsuaki KOIKE ◽  
Hiroyuki ITOH ◽  
Michito OHMI
Keyword(s):  
Image Processing ◽  
Landsat Tm ◽  
Processing Methods ◽  
Lineament Analysis
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