共查询到20条相似文献，搜索用时 15 毫秒
1.
B. Ramesh 《Journal of the Indian Society of Remote Sensing》1989,17(3):101-108
In most of the developing countries, cities are expanding due to urbanization. To cope-up with problem, planners/decision makers need up-to-date physical data base for proper planning and management of the cities. Such data base can be generated quickly through aerial/satellite remote sensing techniques. In this ‘Case Study’ of Chiangmai, Thailand, sequential aerial photographs and SPOT image were used for urban landuse change studies. A comparison was also made for the growth studies of SPOT and aerial photographs. The analysis of study revealed that maximum agriculture land was converted to urban landuse. Urban growth of the city found to be 3.5 times less in case of SPOT results compared to aerial photographs. Urban landuse change was observed all around the city. 相似文献
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This paper is based on a case study of Delhi. The attempt has been made to find out the usefulness of aerial remote sensing in the study of urban fringe where all sorts of haphazard developments take place. Unauthorised construction, illegal sub-division of land, urban sprawl, environmental degradation are all parts of urban fringe Attempt has been made to find out the efficacy of aerial photos at pre-planning stage and their role in assigning various landuses for planned development of urban fringe zone. For the first time, the concept of “Urban Index” has been used to determine the scale of urbanity by aerial remote sensing technique. Growth of settlements, land speculation, impact of anticipated development proposal have been studied. Aerial photographs have been used to detect depressions, drainage pattern, flooding problems, location of high ground water table areas which are very important for a comprehensive planning and for environmental protection. Limitations of topomaps compared to aerial photographs have been worked out. The study is based on air photo-interpretation technique supported by field checking. *** DIRECT SUPPORT *** A04KF011 00003 相似文献
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Remotely-sensed data products have got unique advantage over conventional data-gathering techniques in the study of urban morphology. The physical parameters like built-up area density, street pattern, population density, urban structure as well as functional characteristics which can be derived from land use/land cover map, are clearly visible on aerial data products. This technique provides synoptic view of the area which makes the study comprehensive and uniform. Sequential aerial photographs and satellite imagery help in studying the growth of urban area and temporal changes in urban structure. These informations are very useful in the planning of city extension. Here an attempt has been made to study the urban morphology of Saharanpur city by using panchromatic aerial photographs on scale 1∶10,000, IRS-1B LISS II geocoded imagery on 1∶50,000 scale and photo-maps on 1∶4000 scale, and the results are very encouraging. 相似文献
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Many of the data needs for efficient management of forest resources can be met by aerial photographs. Commercially important tree species can be distinguished from other less important miscellaneous species with the help of aerial photographs. Forests can be classified according to their height and density classes. Aerial photographs have become indispensable for mapping of forests and preparation of forest inventories. A comparison of interpretation results obtained from landsat imagery and aerial photographs (1 ∶ 10,000 Black and White panchromatic photography) with respect to forestry interpretation is given. It is pointed out that the imagery obtained from satellities can be used for reconnaissance of a region and for deciding the priorities for carrying out more detailed surveys of forest resources with the help of air photointerpretation techniques 相似文献
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本文讨论了以热带森林植被为主体的再生资源的面积动态变化监测。研究中包括两个部分。首先,我们利用多时相遥感图像对大面积的西双版纳州进行地类判读,系统地分析了森林植被的动态变化。其次,利用Landsat MSS和TM数据对自然保护区的动态变化进行了包含无监督分类和归一化差值植被指数分析的数字图像处理,变化分类也相当符合实际。总的实验结果表明,这种监测方法是很有效的,可在再生资源监测中特别是在森林植被监测中加以推广应用。 相似文献
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K. P. Tiwari 《Journal of the Indian Society of Remote Sensing》1973,1(1-2):35-42
For assessment of growing stock, the role of aerial photographs mairly consists of volume class stratification, knowing proportion of various stratum and in providing layout for ground sample plots along with their precise location on the the ground. Plain Sal stratum was stratified into three volume classes on the basis of volume stereograms and standard deviation in each stratum estimated on the basis of reconnaissance data. 63 ground plots were needed for ± 5 cum (E = ± 5) accuracy for optimum allocation. Volume in 0.1 hectare circular plots was obtained from measurement of all trees above 10 cm dbh. The mean volume was 124 cum per hectare ± 9.55 cum at 95% probability level. A comparison with Working Plan figures revealed a close similarity. Advantage in time and cost for getting information on growing stock by the use of aerial photographs have been highlighted. 相似文献
8.
TOPSAR wave spectra model and coastal erosion detection 总被引：2，自引：0，他引：2
Maged Mahmoud Marghany 《International Journal of Applied Earth Observation and Geoinformation》2001,3(4):357
This paper presents work done utilizing TOPSAR data to detect shoreline change along the Terengganu coast (Malaysia). TOPSAR data were used to extract information on wave spectra. This wave spectra information was then used to model shoreline changes by investigating the wave refraction patterns. From these patterns, the volume transport at several locations was estimated. The shoreline change model developed was designed to cover a 20 km stretch of shoreline of Kuala Terengganu. The model utilized data from aerial photographs, TOPSAR data and ground truth data. The location of sedimentation and erosion along the shoreline of Kuala Terengganu was estimated. The wave spectra extracted from TOPSAR data showed wavelengths ranging from 20 m to 175 m. The main direction of the waves given by the spectra was from the northeast. The wave refraction patterns varied, showing both convergence and divergence, indicating erosion and sedimentation locations, respectively. A comparison between the TOPSAR shoreline change model and aerial photographs and ground truth data showed a significant relationship. Finally, the regression model showed that erosion occurred particularly at Sultan Mahmed Airport, at a rate of −1.5 m/year. The maximum rate of sedimentation along the 20 km stretch was 1 m/year. 相似文献
9.
Open‐cast mining activity causes the largest georelief transfigurations all over the world. Large localities in north‐west Bohemia (the Czech Republic) are affected. In this area, we focus on a very significant case: the royal town Most, which has been turned into a lake. The main aim of this article is the reconstruction of the original georelief in different time periods together with analysis showing the process of landscape devastation. The workflow and analysis is based on precise elevation data obtained from aerial photographs and old maps. The georelief development is reconstructed using the digitized contour lines contained in Derived state‐map 1:5,000 (SMO5) from the years 1953, 1972, and 1980; maps of the 3rd Military Survey (year 1936); and digital surface models (DSM) extracted, using the pixel correlation method, from aerial images (year 1953 and 2008). The most important results of the analysis are digital terrain models showing the evolution of the landscape which may be used for many purposes in landscape development analysis, historical applications, visualization or landscape reclamation. 相似文献
10.
LIUZhifang HZANGJianqing ZHANGZuxun FANHong 《地球空间信息科学学报》2003,6(2):35-41
On the basis of atereo image analysis,the change detection of man-made objects in urban areas is in-troduced. Information of the height of man-made objects can be applied to reinforce their change detection. By comparison between the new and old DSMs, the changed regions are extracted. However, our aim is to detect changes of man-made objects in urban area and further in the potental areas by the means of line-feature matching and gradient direction histogram. The experiments based on the aerial images from Japan have proven that the algorithm is correct and efficient. 相似文献
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In the semiarid regions of the country a large part is subjected to drought in the years of scanty rainfall. In order to improve agricultural conditions of these regions soil and water management programmes are taken up Use of aerial photo-interpretation techniques can be successfully employed for data collection purposes for these areas. The important diciplines are Geology, Geomorphology, Soils, Hydrology and Land Use where aerial Photographs can be most commonly used. A brief decription of drought prone area in Gokak Taluq of Belgaum district is given which demonstrates the basic interrelationship of physiographic unit with geological conditions, soils and hydrology. A scientific planning of drought prone area requires control measures on watershed basis. Accurate delineation of watersheds and subwatershed is feasible through the use of aerial photographs, which also serve as base maps for compilation of other kinds of data as well. 相似文献
14.
赵福臣 《测绘与空间地理信息》2017,(6):145-147
GNSS辅助摄影测量是在数字摄影测量基础上发展起来的一种技术手段。它使航空摄影、像片控制点布设、外方位元素的获取和空中三角测量进入了一个新时代。本文对航摄分区和补摄、区域划分以及像控点布设应注意的问题进行了探讨,同时,对应用前景进行了概述。 相似文献
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This study aims to prepare a detailed GIS-based geomorphological map accompanied with landfill sites of Dhaka city area which can be used for multipurpose functionality. Attainment of the geomorphological map is based upon interpretation of the oldest available aerial photographs (1:40,000) and contemporary topographic maps (1:8000) which reflect almost pre-urban ground of Dhaka. Randomly distributed 160 boreholes have been used to prepare representative soil profiles (RSP) to identify the near-surface lithology of the geomorphological units. The study reveals that 13 out of 18 low-lying geomorphic units, comprising 65% of the total area demand landfill practices for urban development. Landfill sites have been merged with urban growth on each low-lying geomorphic unit using a spatially enhanced fused image of IRS-1D PAN and ETM+ bands 5, 4 and 3, acquired February 2000 and 2002, respectively. We found that 43% area of the total low-lying geomorphic units experience fill practices so far. The fill sites have been differentiated into four classes based on their relative thickness. Integration of fill classes with geomorphological map shows the urban dynamics of Dhaka city area till 2002. Due to GIS integration, this map can be rapidly updated to demonstrate temporal modifications in urban ground. It can be used effectively in different geomorphological hazard mapping and urban land-use practices. 相似文献
16.
N. C. Gautam 《Journal of the Indian Society of Remote Sensing》1979,7(1):41-47
In this paper house density has been calculated on medium scale photographs and efforts have been made to recognize the physical characteristics of houses on aerial photographs for the purpose of house density mapping. Although the aerial photographs reveal wealth of information regarding the houses, only the residential plots as house units have been taken into account for the present study. 相似文献
17.
Side-looking airborne radar systems (SLAR), which produce fair quality images of the earth’s surface, have been developed over the past twenty years. These systems provide synoptic information over large areas with great speed. In regions where constant cloud cover prevents or hampers aerial photography, radar can be a source of valuable information: however, in less adverse weather conditions and at larger scales single radar images, until quite recently the normal presentation, cannot compete with conventional, stereoscopically viewed aerial photographs. It has now become common practice to take parallel strips with a large, 30–60%, overlap and scanned from the same direction. In this way a stereoscopic effect may be obtained, which considerably improves the interpretation possibilities of such radar images. The same analytical techniques used in photo-geology can also be applied to radar-interpretation. In order to obtain optimal results, the geologist who interprets radar images should have some understanding of radar operation. 相似文献
18.
M. D. Shedha 《Journal of the Indian Society of Remote Sensing》1979,7(2):35-38
A comparative case study of forest cover type mapping from 1:10,000 scale black and white panchromatic aerial photographs and by conventional ground methods of Gudem Reserve Forest of Kaghaznagar Forest Division of Andhra Pradesh Forest Department has been made. The study highlights the advantages of mapping from aerial photographs. The study indicates about the cost and time required for forest cover type mapping by aerial photo-interpretation techniques which is about half, and nearly one fourth respectively, of that required by ground methods. 相似文献
19.
K. P. Sharma M.E. AMIS Utpal Miri M.E. 《Journal of the Indian Society of Remote Sensing》1975,3(1):29-35
Run-off is an important element of the hydrologic studies of any given basin. As such the estimation of the run-off factor of a catchment becomes imperative for determination of the total quantity of its surface run-off. The traditional ground survey methods of hydrologic studies of river basins are gradually getting replaced by more economical and reasonably accurate methods mostly based on aerial photographs. This paper deals with an experiment carried out on the Tons Catchment for determination of its run-off factor with the help of aerial photographs using the photo-interpretation and analysis techniques. The resultant values of the surface runoff have compared very well with the observed flow at Kisau gauging station. This indicates that a suitable methodology can be developed to estimate the discharge of the catchment of Indian rivers, where the run-off data is not available, with reasonable accuracy using the aerial photographs. 相似文献
20.
S. M. Ramaswamy Manohar Sinha C. Devprasad 《Journal of the Indian Society of Remote Sensing》1984,12(2):39-46
The human interaction with nature in the form of improper exploitation and unplanned utilisation of natural resources has caused a lot of environmental imbalance in nature. The aerial photographs and other repetitive orbital remote sensing data provide valuable information in identification and surveying of such environmentally imbalanced zones. In this study the aerial photographs were used in identifying such vulnerable areas and some remedial measures are suggested for the planned exploitation of natural resources without damaging the environment. 相似文献