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本文是利用“空间实验室定标测量相机”(Metric Camera缩写为MC)拍摄的中国西藏日喀则地区的像片,进行室内目视判读的一次尝试。文中概略介绍了1983年11月28日—12月8日,美国航天飞机第9次飞行(STS9)装载的欧洲空间实验室的MC的基本工作参数;利用其像片编制的地质判读辅助图件(水系判读图、线性影像环形影像判读图)和典型岩性、构造的判读工作,并与陆地卫星MSS图像作了简单的比较。认为MC像片的地物影像清晰,反映基岩裸露区的地质信息丰富。在MC像片上易于区别大岩类(如花岗岩类、基性一超基性岩类、正常沉积岩及火山岩等),甚至可以发现某些地层标志层或走向上的差异;多数岩层产状可以辨认,褶皱可以定性判读;断裂判读效果很好,其规模、方向、组合都有不同程度的反映,同时,还可以判读出一些隐伏断裂。MC像片的判读效果优于MSS图像,可以满足中、小比例尺编图的要求,对中比例尺野外地质调查能起到很好的作用。 相似文献
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地图比例尺与遥感影像分辨率的关系探讨 总被引：2，自引：0，他引：2
探讨地图比例尺与遥感影像分辨率的关系,为特定比例尺制图选择适宜分辨率的遥感影像在遥感影像制图中极为重要。本文分析了人眼分辨率和比例尺精度、地图比例尺和影像分辨率之间的关系,以30 m分辨率的landsat5遥感影像、2.1 m分辨率的ZY-3遥感影像及0.5 m分辨率的Word View-2遥感影像进行实验,探讨了不同人眼分辨率下的遥感影像成图质量。得到了1∶M比例尺制图时的遥感影像分辨率的选择范围为(1×10~(-4)M,5×10~(-4)M),最佳遥感影像分辨率为2.5×10~(-4)M的结论,并用已有应用实例对其可靠性进行了检验,进而为我国基本比例尺制图遥感影像的选择提供了依据。 相似文献
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以地形图上的地物点作控制，在肉眼配准下放大SPOT图像，图像的几何精度能否满足有关大、中比例尺专题图编制的精度要求，这是专题图编制人员一直所关心的问题。根据国内外有关研究已知，SPOT图像影像的几何误差在10米左右（指分辨率为10米的全色图像），可以用于测绘1/10万和修测1/5万比例尺的国家基本地形图[1]。从这一结果来看，SPOT图像用于编制中比例尺专题图，其精度是不成问题的。但由于编制这类比例尺专题图需要放大图像的比例尺，如果放大时操作不严或使用的方法不当，则势必影响图像的原有质量，使图像不能用于专题图的编制工作。 相似文献
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当前利用多旋翼无人机倾斜摄影建立三维模型,已在大比例尺地形测图中广泛应用,相较于传统数字测图,其作业方式和效率均有了很大改变。本文采用飞马多旋翼无人机,搭载D-OP3000倾斜摄影模块,在某低山丘陵地貌区域获取高精度倾斜摄影数据后,利用Context Capture软件进行空三加密和三维建模,并采用山维科技EPS软件进行立体测图;同时对倾斜摄影和垂直摄影在免像控和有像控点不同方案的精度进行比较,验证了免像控方案空三精度、模型分辨率及地形测量成果质量能满足1∶1000比例尺地形图精度要求,有像控点方案高程精度较高,可满足1∶500大比例尺地形测图和土方工程量计算精度要求。 相似文献
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国产卫星遥感数据以其大范围同步观测、综合成本较低等特点在电力选线中具有潜在的应用优势。本文以某220 k V架空输电线路设计为例,对高分二号正射影像进行无控定位精度和有控定位精度分析比较,以及对资源三号影像进行区域网平差,统计分析其在无控制点和有控制点情况下的平差精度。研究表明:高分二号卫星影像在有控制点的情况下其纠正精度完全能够满足1∶10 000全地形比例尺精度要求,利用资源三号影像制作DSM的高程精度能够满足山区1∶10 000地图比例尺要求。综合电力选线相关规程中对选线各阶段的比例尺要求,国产高分二号和资源三号联合应用,完全能够满足山地地区的电力选线的可研性和初设阶段的平面及高程精度需求。 相似文献
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地图以特定的投影作为数学基础。日趋广泛的卫星图像制图也必将建立适合自身特点的空间投影作为数学基础c自从1974年美国科学家A.P.Colvocresses提出SOM投影以来,空间投影便开辟了地图投影的新领域.空间投影是为了满足航天测图的需要,设计和选择的一种能反映随时间变化的投影方法,是适合于卫星与地球作相对运动时获取的遥感图像的新型地图投影.美国80年代已将SOM投影系统成功地应用于卫星MSS图像的处理和连续制图,奠定了空间投影在卫星图像处理和制图方面的应用基础。随着航天技术的发展,动态传感器如多光谱扫描仪（MSS）。线阵… 相似文献
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An empirical study was performed assessing the accuracy of land use change detection when using satellite image data acquired ten years apart by sensors with differing spatial resolutions. Landsat/Multi‐spectral Scanner (MSS) with Landsat/Thematic Mapper (TM) or SPOT/High Resolution Visible (HRV) multi‐spectral (XS) data were used as a multi‐data pair for detecting land use change. The primary objectives of the study were to: (1) compare standard change detection methods (e.g. multi‐date ratioing and principal components analysis) applied to image data of varying spatial resolution; (2) assess whether to transform the raster grid of the higher resolution image data to that of the lower resolution raster grid or vice‐versa in the registration process: and (3) determine if Landsat/TM or SPOT/ HRV(XS) data provides more accurate detection of land use changes when registered to historical Landsat/MSS data. Ratioing multi‐sensor, multi‐date satellite image data produced higher change detection accuracies than did principal components analysis and is useful as a land use change enhancement technique. Ratioing red and near infrared bands of a Landsat/MSS‐SPOT/HRV(XS) multi‐date pair produced substantially higher change detection accuracies (～10%) than ratioing similar bands of a Landsat/MSS ‐ Landsat/TM multi‐data pair. Using a higher‐resolution raster grid of 20 meters when registering Landsat/MSS and SPOTZHRV(XS) images produced a slightly higher change detection accuracy than when both images were registered to an 80 meter raster grid. Applying a “majority”; moving window filter whose size approximated a minimum mapping unit of 1 hectare increased change detection accuracies by 1–3% and reduced commission errors by 10–25%. 相似文献
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We present here the examples that show how fusing data from hyperspectral sensors with data from high spatial resolution sensors can enhance overall road detection accuracy. The fusion of hyperspectral and high spatial resolution data combines their superior respective spectral and spatial information. IKONOS (MSS) and Hyperion images were fused using the principal component analysis (PCA) method. The approach for road extraction integrates multiresolution segmentation and object oriented classification. Road extraction is done from an IKONOS (MSS) image and a Hyperion and IKONOS (MSS) merged image and comparisons are made depending on accuracy and quality measures such as completeness and correctness. This article also emphasises the types of roads which are giving better accuracy of extraction after fusion with hyperspectral image. This can vary because of types of material and condition of roads. The methodology was applied on roads of Dehradun, India. 相似文献
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The assessment of multi-sensor image fusion using wavelet transforms for mapping the Brazilian Savanna 总被引：2，自引：0，他引：2
F.W. Acerbi-Junior J.G.P.W. Clevers M.E. Schaepman 《International Journal of Applied Earth Observation and Geoinformation》2006,8(4):278-288
Multi-sensor image fusion using the wavelet approach provides a conceptual framework for the improvement of the spatial resolution with minimal distortion of the spectral content of the source image. This paper assesses whether images with a large ratio of spatial resolution can be fused, and evaluates the potential of using such fused images for mapping the Brazilian Savanna. Three types of wavelet transforms were used to perform the fusion between MODIS and Landsat TM images. Five quality measures were defined to assess the quality of the fused images. The results showed that it was possible to perform the fusion of MODIS and TM images and the pyramidal in Fourier space wavelet transform provided the best quality measures for the fused images. Classification results showed that fused images could be used for mapping the Brazilian Savanna with an accuracy level comparable to the Landsat TM image. 相似文献
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R. S. Dwivedi 《Journal of the Indian Society of Remote Sensing》1988,16(2):21-26
The Landsat MSS and TM data in the form of false colour composite (FCC) prints at 1∶250,000 scale over parts of Mirzapur (U.P.) and Rohtas district of (Bihar) were interpreted monoscopically in concert with the collateral data and limited field check for soilscape boundary delineation. The study has revealed that at the mapping scale, except for improved image contrast and capturing features of relatively smaller dimensions, no additional advantage has been noticed with TM data over MSS data with respect to exhibition of soilscape boundaries. However, the capability of TM data to withstand enlargement upto 1∶50,000 which is not feasible with MSS data is an additional feature from soil mapping viewpoint. 相似文献
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Surendra Singh K. D. Sharma Nepal Singh D. N. Bohra 《Journal of the Indian Society of Remote Sensing》1988,16(4):53-56
Temporal changes in ephemeral river courses and associated flood plains, which could not be detected by Landsat MSS due to its poor spatial resolution of 80m, have been identified and mapped within 10% accuracy by Landsat TM False colour composite because of its higher spectral and spatial resolution of 30 m. Over a period of 28 years (1958–86) the river courses widened upto 1.8 times through bank erosion due to the recurring flash floods. The flash floods have also caused morphological, soil fertility and landuse changes in the associated flood plains, which could also be monitored by the Landsat TM. 相似文献
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Phenological metrics-based crop classification using HJ-1 CCD images and Landsat 8 imagery 总被引：1，自引：0，他引：1
Xiaochun Zhang Qinxue Xiong Liping Di Junmei Tang Jin Yang Huayi Wu 《International Journal of Digital Earth》2018,11(12):1219-1240
Crop type data are an important piece of information for many applications in agriculture. Extracting crop type using remote sensing is not easy because multiple crops are usually planted into small parcels with limited availability of satellite images due to weather conditions. In this research, we aim at producing crop maps for areas with abundant rainfall and small-sized parcels by making full use of Landsat 8 and HJ-1 charge-coupled device (CCD) data. We masked out non-vegetation areas by using Landsat 8 images and then extracted a crop map from a long-term time-series of HJ-1 CCD satellite images acquired at 30-m spatial resolution and two-day temporal resolution. To increase accuracy, four key phenological metrics of crops were extracted from time-series Normalized Difference Vegetation Index curves plotted from the HJ-1 CCD images. These phenological metrics were used to further identify each of the crop types with less, but easier to access, ancillary field survey data. We used crop area data from the Jingzhou statistical yearbook and 5.8-m spatial resolution ZY-3 satellite images to perform an accuracy assessment. The results show that our classification accuracy was 92% when compared with the highly accurate but limited ZY-3 images and matched up to 80% to the statistical crop areas. 相似文献
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Landsat系列卫星光学遥感器辐射定标方法综述 总被引：1，自引：0，他引：1
Landsat系列卫星自1972发射以来,已经连续提供了40多年的中等分辨率多光谱遥感数据,广泛应用于农业、水资源管理、灾害响应等领域。目前,很多研究人员开始考虑利用这些数据开展中分辨率尺度的长时间序列地表定量信息监测,更加精细地反映局地甚至全球气候变化。开展这些研究的前提在于对数据进行辐射定标,并通过不同卫星的交叉辐射传递保证数据辐射精度的一致性。从Landsat 1到Landsat 8,随着遥感器性能和数据获取能力的提升,辐射定标方法不断更新,涉及发射前实验室定标、内定标灯方法、全孔径太阳定标器方法、交叉定标方法、场地定标方法等。本文在对Landsat系列卫星的遥感器性能进行分类、归纳、对比的基础上,系统梳理了Landsat系列卫星遥感器辐射定标方法发展过程以及不同定标方法的优缺点,特别是对定标精度的影响。Landsat系列卫星辐射定标的发展过程为遥感数据高精度定量化应用提供了非常重要的基础,未来辐射定标方法不但要随着新型遥感器研制而更新,更要注重多源遥感数据的交叉验证以及全过程辐射定标方法的完善与应用,保障遥感数据辐射定标精度的一致性。 相似文献
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Wei Su Zhong-Ping Sun Dao-Liang Li Raaj Ramsankaran Xiang Zhu Xiang-Yun Guo 《Journal of the Indian Society of Remote Sensing》2009,37(4):631-645
Vegetation condition monitoring has been done from 1975 to 2000 in the waste dump of Haizhou opencast coalmine area, China,
using remote sensing techniques with the objective of improving our understanding of the temporal and spatial variation of
vegetation recovery in the mining dump. Four historical vegetation indexes (NDVI, VF, soil brightness and vegetation greenness)
from two Landsat 2 MSS images and two Landsat 5 TM images are extracted and analyzed. For the purpose of comparison and analysis
two improved techniques such as normalization grading of change slope and image segmentation were used in this study. Based
on the results obtained through the above analysis two conclusions are derived: (1) vegetation recovery in the study area
is in an improved condition, (2) two remote sensing based vegetation indexes such as VF and NDVI are the optimal parameters
to monitor vegetation condition, which could be used as the indicators of land reclamation progress in the mining area. 相似文献
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G. Ducher 《The Photogrammetric Record》1985,11(66):671-689
A short review is given of the involvement of the Institut Géographique National (IGN) in the European Space Agency Spacelab Metric Camera (MC) experiment. IGN has participated in this project from the early stages of its preparation in 1974. The assessment of MC data has been carried out for both metric and thematic purposes. Using a Matra Traster analytical plotter, a contoured map of Carpentras. included in the European standard test site of Marseille, has been prepared at a scale of 1:100 000 with 100 m and 50 m contour intervals. Preliminary comparison of this map with the topographic data base shows a height accuracy of about 30 m. Orthophotographs have been produced of the same area, at 1:100000 scale and at 1:250000 scale. showing good agreement with the basic line map. An infrared colour pseudo-orthophotograph has been produced for Khartoum (assuming that the ground was flat) and a space map of a desert area of Algeria has been printed at 1:200000 scale, allowing a good comparison with the drainage shown on the existing line map. Interpretation of the MC photography has also been assessed and compared with conventional IGN aerial photography taken over the European standard test site. Due to the low sun elevation and the apparent image motion which affected the MC photography, the result is not as good as was expected. Some linear features of 6m width are visible (for example, roads and hedges) but for positive identification a width of 18m is necessary. It is difficult to determine the extent of cities and land parcels less than 40 × 40m are not visible. However, the MC data can be used for checking and revising some features of small scale maps (smaller than 1:100000). Two experiments have been performed in thematic interpretation, one concerned with land use and the other with forest mapping. Some improvements of the MC are suggested in order to satisfy the major requirements of users while the possibilities of topographic mapping from these data are summarised. 相似文献