IDENTIFYING AND DOCUMENTING LANDSCAPE CHANGES BY THE USE OF MULTI-TEMPORAL HISTORICAL AERIAL PHOTOS AND ALS-GENERATED DEMS – AN AUTOMATED AND RETROSPECTIVE APPROACH

2013 ◽  
pp. 11-12
Author(s):  
O. Risbøl ◽  
C. Briese ◽  
M. Doneus ◽  
A. Nesbakken
Keyword(s):  
Landscape Changes ◽  
Aerial Photos ◽  
Multi Temporal

scholarly journals Brief communication "Determination of urban growth in catchment areas in Cyprus using multi-temporal remotely sensed data: risk assessment study"

2010 ◽  
Vol 10 (11) ◽  
pp. 2235-2240 ◽  
Author(s):  
D. G. Hadjimitsis
Keyword(s):  
Risk Assessment ◽  
Catchment Area ◽  
Image Data ◽  
Remotely Sensed ◽  
Remotely Sensed Data ◽  
Aerial Photos ◽  
Area Of Interest ◽  
Catchment Areas ◽  
Multi Temporal

Abstract. The aim of this study is to quantify the actual urbanization activity near the catchment area in the urban area of interest located in the vicinity of the Agriokalamin River area of Kissonerga Village in Paphos District. Remotely sensed data such as aerial photos, Landsat-5/7 TM/ETM+ and Quickbird image data have been used to track the urbanization activity from 1963 to 2008. In-situ GPS measurements have been used to locate in-situ the boundaries of the catchment area. The results clearly illustrate that tremendous urban development has taken place ranging from 0.9 to 33% from 1963 to 2008, respectively. A flood risk assessment and hydraulic analysis were also performed.

Integration of Satellite Remote Sensing Techniques and Landscape Metrics to Characterize Land Cover Change and Dynamics

2013 ◽  
pp. 228-244
Author(s):  
Carmelo Riccardo Fichera ◽  
Giuseppe Modica ◽  
Maurizio Pollino
Keyword(s):  
Remote Sensing ◽  
Land Cover ◽  
Landscape Metrics ◽  
Landsat Images ◽  
Aerial Photos ◽  
Multi Temporal ◽  
Urban Rural ◽  
Remote Sensing Techniques

One of the most relevant applications of Remote Sensing (RS) techniques is related to the analysis and the characterization of Land Cover (LC) and its change, very useful to efficiently undertake land planning and management policies. Here, a case study is described, conducted in the area of Avellino (Southern Italy) by means of RS in combination with GIS and landscape metrics. A multi-temporal dataset of RS imagery has been used: aerial photos (1954, 1974, 1990), Landsat images (MSS 1975, TM 1985 and 1993, ETM+ 2004), and digital orthophotos (1994 and 2006). To characterize the dynamics of changes during a fifty year period (1954-2004), the approach has integrated temporal trend analysis and landscape metrics, focusing on the urban-rural gradient. Aerial photos and satellite images have been classified to obtain maps of LC changes, for fixed intervals: 1954-1985 and 1985-2004. LC pattern and its change are linked to both natural and social processes, whose driving role has been clearly demonstrated in the case analysed. In fact, after the disastrous Irpinia earthquake (1980), the local specific zoning laws and urban plans have significantly addressed landscape changes.

Multidisciplinary approach to assess landslide hazards in alpine environment: the geomorphological map of the upper Maira Valley (Western Alps, Italy).

2020 ◽  
Author(s):  
Mauro Bonasera ◽  
Alessandro Petroccia ◽  
Fabiola Caso ◽  
Sara Nerone ◽  
Michele Morelli
Keyword(s):  
Western Alps ◽  
Local Analysis ◽  
Rock Falls ◽  
Stratigraphic Sequence ◽  
Aerial Photos ◽  
Digital Elevation ◽  
Multi Temporal ◽  
Gis Environment ◽  
Elevation Model ◽  
Cover Thickness

<p>The landscape evolution of the U-shaped Maira Valley was mainly led by glacial dynamics during Pleistocene. The Holocene linear fluvial erosion creates higher steepness slopes in a narrow valley in which gravitational phenomena involves buildings and facilities of Acceglio municipality (Piedmont, Italy). A geomorphological survey in an unmapped area of about 12 km<sup>2</sup> has been carried out and a new map at scale 1:10000 has been realised. In order to improve the accuracy of fieldwork data, several multidisciplinary techniques have been investigated. The landforms and slope evolution were analysed by using a 5-meters resolution ARPA Digital Elevation Model (DEM) in GIS environment. Discontinuities and geomorphological features were recognized and mapped observing aerial-photos provided by Regione Piemonte. Multi-temporal dataset of orthophotos were useful to examine the river pattern behaviour coupled with interdigitating polygenic fan deposition. The stratigraphic sequence knowledge was achieved using boreholes, inclinometers and piezometers evaluating eventual detrital cover thickness. Detailed field investigations allowed to understand the relationship between structural geology and landslide evolution, in particular concerning several detachment zones characterising the slope overlooking Acceglio town. In the uppermost range of that slope, the fracturation is intense and influences the rock-falls and rock avalanches trigger, whilst debris flows were identified throughout the detected area associated with a homogeneous presence of weathered cover. Widespread accumulation bodies suggest how avalanche and debris flow occurrences have affected Acceglio human activities, testified by historical archives documents as well. In the past, several trial to mitigate these risks were performed through engineering activities which could be refined and implemented with further local analysis on landslide susceptibility. Research on this issue, in addition to having a great scientific interest, can provide essential tools for upper Maira Valley Administrations, being the main available support for an appropriate urban planning.</p>

Relationship of aircraft radiometric measurements to bare ground on semi-desert landscapes in central Australia.

1984 ◽  
Vol 6 (2) ◽  
pp. 59 ◽  
Author(s):  
BD Foran ◽  
G Pickup
Keyword(s):  
Elevation Angle ◽  
Bare Soil ◽  
Bare Ground ◽  
Aerial Photos ◽  
Linear Relationships ◽  
Multi Temporal ◽  
Central Australia ◽  
The Difference ◽  
Variation Explained ◽  
Highly Correlated

Radiance values in Landsat MSS bands were measured over five landscapes typical of central Australia: a calcareous plain, an eroded calcareous plain, a gibber plain, a floodplain and a savannah woodland. using an aeroplane-mounted isotech four band radio- meter flown at a height which gave Landsat pixe!-sixed sampling areas. Forty-five radiometric variables derived from these radiance data were correlated with the amount of bare soil interpreted frotn aerial photos. On the calcareous plains and the floodplain, the highest correlations were obtained with the visible bands, Band 4 and Band 5, and the difference between them. On the gibber plains and savannah woodlands the best correlations were obtained with the ratio of Band 5 to Band 7 and the subtraction ratio of B4-B5/ B4-B7. A series of linear relationships were developed linking bare ground \vith radiometric variables which expl'ained between 705% and 85% of the variation. Multiple regression analysis on the radiometer indiccs most highly correlated with total bare ground showed that inclusion of other cover variables such as litter, shadow, soil colour and herbage covcr increased the variation explained by only 5-10%. A test of the effect of differences in solar elevation angle on the 45 radiometric variables showed that the radiance values in each band and differences between them \$cue significantly affected. Eight indices were affected to a lesser degree and may bc useful for multi- temporal work. Some considerations of the use of the selected indices for practical landscape monitoring are also discussed.

scholarly journals MASTRO ESTENDÍVEL MANUALMENTE PARA A OBTENÇÃO DE FOTOGRAFIAS “AÉREAS” INCLINADAS

FLORESTA ◽  
2011 ◽  
Vol 41 (3) ◽  
Author(s):  
Attilio Antonio Disperati ◽  
Fábio Henrique de Almeida ◽  
Sérgio Xavier de Mendonça Júnior ◽  
Caciane Peinhopf ◽  
Bárbara Dalgallo
Keyword(s):  
Lower Cost ◽  
Digital Camera ◽  
Aerial Photographs ◽  
Individual Tree ◽  
Aerial Photos ◽  
Additional Tool ◽  
First Results ◽  
Multi Temporal ◽  
Low Altitude ◽  
Final System

O presente artigo relata o desenvolvimento e a utilização de mastro estendível manualmente para a captura de fotografias aéreas. Inicialmente, testou-se a fixação de microcâmara de segurança no topo do mastro e, posteriormente, de câmara digital. Incentivado pelos resultados iniciais, obteve-se uma plataforma e um sistema fotográfico que possibilitava acionar, girar e inclinar uma câmara fotográfica digital por controle remoto instalada no topo do mastro, viabilizando a tomada de fotografia aérea inclinada, panorâmica e sequencial, com giro de até 360 graus. O conjunto é constituído por: (1) mastro estendível até oito metros; (2) tripé; (3) plataforma e sistema fotográfico; (4) maleta com o sistema de captura e observação da imagem em tempo real; e (5) caixa de ferramentas. Foram obtidas 1887 fotografias digitais e 21 vídeos em dezoito ocasiões, utilizados nas seguintes finalidades: individual, multitemporal e elaboração de mosaicos fotográficos. A plataforma e o sistema podem ser aperfeiçoados visando maior facilidade de uso. Estudos específicos direcionados à árvore individual realçariam o potencial da técnica. O mastro estendível é uma ferramenta a mais de trabalho, de baixo custo, adicionada à caixa de ferramentas do sensoriamento remoto, com aplicações limitadas somente pela imaginação dos usuários.Palavras-chave:   Fotointerpretação florestal; aquisição de fotos; câmara digital; fotografias em baixa altitude; árvore individual. AbstractExtensible manually mast for acquisition of oblique “aerial” photographs. This paper presents the experience of using a manual telescopic mast in order to take aerial photographs. First of all, a security micro-camera was fixed to the top of a mast and, later on, a digital camera. Due to the first results, a frame and a photographic system had been developed, allowing to shoot, to rotate and to incline the digital camera by remote control, which fixed to the top of the mast would allow taking oblique, panoramic and sequential aerial photos with 360 degrees range. The final system consists of (1) an extensible telescopic mast up to eight meters, (2) tripod, (3) the frame and photographic system, (4) a small box containing the capturing and observation of real time images system and a (5) tool box. During the research it was taken 1887 digital photographs and 21 videos for the following purposes: individual, multi-temporal and photo mosaics mounting. The final frame and photographic system can be improved in order to make easy the photos taking. Specific forest studies toward an individual tree would enhance the potential of the technique. The telescopic mast is an additional tool for Remote Sensing toolbox and that, due the lower cost, is limited only by the user’s imagination.Keywords:              Forest photointerpretaion; photo acquisition; digital camera; low altitude photographs; individual tree.

scholarly journals Evaluating the Landslides Characterization and Deformation Using Multi-Temporal Uav Imageries in Northern Pakistan

2021 ◽  
Author(s):  
Muhammad Shafique ◽  
Naseem Ahmad ◽  
Mian Luqman Hussain
Keyword(s):  
Accuracy Assessment ◽  
Satellite System ◽  
Geodetic Survey ◽  
Surface Model ◽  
Aerial Photos ◽  
Surface Movement ◽  
Ground Control Points ◽  
North Pakistan ◽  
Multi Temporal ◽  
Global Navigation Satellite

Abstract The Un Manned Aerial Vehicles (UAVs) have emerged as an effective tool for mapping and evaluating the landslides dynamics. This study aims to evaluate the dynamics of the landslide using the UAV derived aerial photos and Digital Surface Model (DSM). The selected landslides are the Nara and Nokot landslides in the rough terrain of Balakot, north Pakistan. The UAV survey was carried in April and August 2019 for Nara and Nokot landslides in Balakot. The images were processed in the Pix4D mapper to compute the orthomosaic and DSMs. The Ground Control Points (GCPs) collected in the geodetic survey with the Global Navigation Satellite System (GNSS) using Post Processing Kinematic (PPK) were used to accurately co-register and orthorectify the UAV imageries. The derived DSMs were analyzed to evaluate the dynamics in the landslide’s topography and volumetric changes. The shaded relief single band was used to correlate the temporal images for the Nara and Nokot landslide using the COSI-Corr algorithm. The statistical and frequent correlator was used for landslide displacement. The result shows that the Nara landside has a surface movement ranging from 1 to 29 m in the NE scarp and lateral areas. The Nokot landslide has active NS, NE and NW scarps with a surface movement ranging from 1 to 25.5 m. The accuracy assessment reveals the RMSE calculated for the Nara landslide as 4.58 m and 4.24 m for the Nokot landslide. This study reflected the potential application of UAVs for monitoring the landslides dynamics to mitigate the hazard.

scholarly journals Landslides detection in Bat Xat district, Lao Cai province, Vietnam using the Alos PalSAR time-series imagery by the SBAS method

2020 ◽  
Vol 61 (4) ◽  
pp. 1-10
Author(s):  
Anh Van Tran ◽  
Binh An Nguyen ◽  
Tien Dinh ◽  
Yen Hai Thi Nguyen ◽  
Nghi Thanh Le ◽  
...  
Keyword(s):  
Time Series ◽  
Mineral Resources ◽  
Radar Interferometry ◽  
Alos Palsar ◽  
Aerial Photos ◽  
Radar Images ◽  
Multi Temporal ◽  
Lao Cai

Radar Interferometry (InSAR) has been known as a technology to monitor the change of elements on the earth's surface for many years. There are many InSAR methods, in which the permanent scattering InSAR Radar (PSInSAR) method uses a series of images to determine the terrain deformetions quite well. However, for areas with lots of vegetation, the number of permanent scattering points (PS points) will be limited. In this paper, we have chosen a method that also uses a set of multi-temporal Radar images but has the lowest spatial and temporal image baselines, this method is called the Small Baselines method (SBAS). With the ALOS PalSAR images series that was collected from August 2007 to November 2010, many landslide points in the area of Bat Xat district, Lao Cai province were discovered. The landslide locations detected from Radar images were compared with the landslide surveying points and landslide interpreted by aerial photos in 2013 provided by Vietnam Institute of Geosciences and Mineral Resources Vietnam. There have been many sliding sites coinsiding with the surveyed landslides, which proves that many landslides exist and develop continuously such as the location of Mong Sen bridge, Trung Chai Commune or at Sai Duan bridge, Phin Ngan commune.

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