Monitoring Changes in Rice Cultivated Area from SAR and Optical Satellite Images in Ben Tre and Tra Vinh Provinces in Mekong Delta, Vietnam

Karila, Kirsi; Nevalainen, Olli; Krooks, Anssi; Karjalainen, Mika; Kaasalainen, Sanna

doi:10.3390/rs6054090

Cited by 31 publications

(19 citation statements)

References 30 publications

(37 reference statements)

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“…The use of Earth Observation images archives and classification techniques is a reliable and cost-effective way to obtain information about the evolution of land use/ cover on large areas over several decades (Karila et al 2014). We used Landsat3 (MSS), Landsat5 (TM) and Landsat8 (OLI) images from five different time periods (1978, 1986, 1999, 2006 and 2013) to quantify longterm culture area evolution around the NGR.…”

Section: Evolution Of Land Use Around Nazingamentioning

confidence: 99%

Conserving wildlife amongst the cotton fields. A third of a century of experience at the Nazinga Game Ranch, Burkina Faso

Bouché

Lejeune

Bailly

et al. 2016

Environ Monit Assess

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Established in the early 1970 as a participatory wildlife production area, the Nazinga Game Ranch turned into an island of conservation surrounded by cultivation. We asked ourselves how long-term ungulate trends are affected in a context of continuous human pressure. To find out, we compiled and analysed the data of yearly line-transect counts of mammals carried out since 1985. Results showed that large species such as the elephant (Loxodonta africana) and large antelopes increased or showed stable populations. In contrast, medium and small ungulates showed continuously decreasing trends. During the same period, rainfall, water availability from artificial water points and the crop encroaching outside Nazinga Game Ranch increased. After an initial significant reduction, illegal human signs increased. However, we showed that human signs were positively correlated with the abundance of large ungulates but negatively correlated with the abundance of medium and small ones. In conclusion, this study showed that some isolated mammal populations could be restored and maintained in the long term, in spite of being surrounded by highly cultivated areas.

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Section: Evolution Of Land Use Around Nazingamentioning

confidence: 99%

Conserving wildlife amongst the cotton fields. A third of a century of experience at the Nazinga Game Ranch, Burkina Faso

Bouché

Lejeune

Bailly

et al. 2016

Environ Monit Assess

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“…In this context, remote sensing has become a very efficient tool for precision farming of large areas through data acquired by sensors on-board satellite platforms [3], airborne imagery [4], and unmanned aerial vehicles (UAVs) [5]. In this framework, rice cultivation is one of the most extended land uses for food production worldwide and has therefore been the main objective of many studies using optical [6,7] and radar [8][9][10] remote sensing techniques. In this context, leaf area index (LAI) is a key biophysical variable for both crop monitoring and modelling applications, defined as the total one-sided leaf area in relation to the ground [11].…”

Section: Introductionmentioning

confidence: 99%

Multitemporal Monitoring of Plant Area Index in the Valencia Rice District with PocketLAI

et al. 2016

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Leaf area index (LAI) is a key biophysical parameter used to determine foliage cover and crop growth in environmental studies in order to assess crop yield. Frequently, plant canopy analyzers (LAI-2000) and digital cameras for hemispherical photography (DHP) are used for indirect effective plant area index (PAI e f f ) estimates. Nevertheless, these instruments are expensive and have the disadvantages of low portability and maintenance. Recently, a smartphone app called PocketLAI was presented and tested for acquiring PAI e f f measurements. It was used during an entire rice season for indirect PAI e f f estimations and for deriving reference high-resolution PAI e f f maps. Ground PAI e f f values acquired with PocketLAI, LAI-2000, and DHP were well correlated (R 2 = 0.95, RMSE = 0.21 m 2 /m 2 for Licor-2000, and R 2 = 0.94, RMSE = 0.6 m 2 /m 2 for DHP). Complementary data such as phenology and leaf chlorophyll content were acquired to complement seasonal rice plant information provided by PAI e f f . High-resolution PAI e f f maps, which can be used for the validation of remote sensing products, have been derived using a global transfer function (TF) made of several measuring dates and their associated satellite radiances.

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“…A number of studies have attempted to detect and describe the land cover/land use changes in several different districts of Ca Mau Province-the southern-most part of the delta in Vietnam (Figure 1) [13][14][15] or in the Mekong Delta [16][17][18][19][20]. These studies, however, analyzed changes over a short time periods or at low spatial or temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Land Cover/Land Use Changes in the Mekong Delta, 1973–2011: A Remote Sensing Analysis of the Tran Van Thoi District, Ca Mau Province, Vietnam

Tran

Thuc²,

Kervyn

2015

Remote Sensing

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Abstract:The main objective of this study is to assess the spatio-temporal dynamics of land cover/land use changes in the lower Mekong Delta over the last 40 years with the coastal Tran Van Thoi District of Ca Mau Province, Vietnam as a case study. Land cover/land use change dynamics are derived from moderate to high spatial resolution (Landsat and SPOT) satellite imagery in six time intervals ranging from 1973 to 2011. Multi-temporal satellite images were collected, georeferenced, classified using per-pixel method, validated, and compared in post classification for the land use/land cover change detection in decades. Seven major land cover/land use classes were obtained, including cultivated lands, aquaculture ponds, mangrove forest, melaleuca forest, built up areas, bare lands, and natural water bodies. The accuracies of the land cover/land use maps for

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Monitoring Changes in Rice Cultivated Area from SAR and Optical Satellite Images in Ben Tre and Tra Vinh Provinces in Mekong Delta, Vietnam

Cited by 31 publications

References 30 publications

Conserving wildlife amongst the cotton fields. A third of a century of experience at the Nazinga Game Ranch, Burkina Faso

Conserving wildlife amongst the cotton fields. A third of a century of experience at the Nazinga Game Ranch, Burkina Faso

Multitemporal Monitoring of Plant Area Index in the Valencia Rice District with PocketLAI

Dynamics of Land Cover/Land Use Changes in the Mekong Delta, 1973–2011: A Remote Sensing Analysis of the Tran Van Thoi District, Ca Mau Province, Vietnam

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