共查询到20条相似文献，搜索用时 125 毫秒
1.
针对湿地资源调查与管理需求,利用多期遥感影像、地理国情普查和湿地专题数据资源,基于黑龙江省地理信息公共服务平台,设计了湿地资源调查与管理地理信息系统的总体框架,并在此基础上,给出了湿地一张图、湿地监管、多期遥感影像监测等子系统的实现内容,为湿地资源调查与管理信息系统建设提供参考。 相似文献
2.
以哈尔滨市道外区为研究区,利用2011年9月拍摄的WorldView 2遥感影像,建立湿地资源解译标志,采用人机交互方式进行湿地资源调查,为哈尔滨市道外区湿地保护及利用规划提供技术支持。 相似文献
3.
4.
5.
基于ZY-1 02C数据开展矿产资源开发多目标遥感调查与监测,运用PCA,HSV,Brovery和GramSchmidt等融合方法对ZY-1 02C影像进行融合,对每种融合方法的融合效果进行定性与定量分析评价。研究结果表明,Gram-Schmidt融合方法是一种适合于矿产资源开发多目标遥感调查与监测的ZY-1 02C数据融合方法。 相似文献
6.
对两个有关土地利用状况调查区域的高光谱和Quickbird数据进行了数百次算法对比实验,最终确定Sym4和Db2是曲波变换中的最佳小波函数,提出两种基于曲波变换的高光谱遥感图像融合方法,即加权法和选择法,获得了更精确的高光谱遥感融合影像.在一个研究区域,通过对高光谱数据的子带分解、脊波变换、一定融合以及它们的逆变换等曲波变换过程,表明融合的高光谱遥感影像能提供许多有利于土地类型划分和影像识别的精确七地信息.在另一个研究区域,除进行曲波变换外,还通过二次多项式计算实现了高光谱与Quickbird数据遥感影像匹配,最终从高光谱与Quickbird数据获得的遥感融合影像经日视及信息熵、相关系数等评价表明,曲波变换融合图像优于小波变换融合图像,与Brovey融合图像相近,但比PCA融合图像稍差.客观和主观评价证实,曲波变换的遥感融合方法能为高光谱遥感图像在土地利用状况调查提供更多更准确的信息. 相似文献
7.
为确保土地利用数据的真实性,设计基于多源遥感数据的第三次国土调查内业信息提取方法.以高分二号卫星采集的全色与多光谱影像为基础,采用S-G(Savitzky-Golay)滤波器通过噪声消除、配准、重采样实现全色与多光谱影像融合,利用像元亮度校正改善融合后影像像元亮度饱和现象.根据最小代价切割实现多源遥感影像不同地类边界划分,获取大量遥感影像图块,逐个分析与判断遥感影像图块类型,通过同第二次国土调查数据库相对比提取差异性地类图斑、偏移图斑、在建图斑,实现第三次国土调查内业信息提取.实验结果显示,该方法的遥感影像分割与融合效果好,可有效提升遥感图像清晰度,增强图像细节特征,保证土地利用数据的真实性. 相似文献
8.
为了解决遥感影像上潮滩湿地植被光谱相似性导致的分类困难问题,本文以Lansat5、IKONOS影像为数据源,探讨了融合技术在潮滩湿地植被遥感分类中应用,提出了基于小波融合变换的神经网络分类方法。实验结果表明,融合技术提高了潮滩湿地植被的分类总精度,具有较好的实用效果。 相似文献
9.
对国内外提供遥感影像数据的主要网站进行了调查与分析,总结归纳出网站所提供影像的主要数据特点及数据使用方法。为广大遥感影像用户获取网络遥感影像资源提供便利。 相似文献
10.
滨海湿地是自然作用和人类活动剧烈地带,及时监测湿地资源及其生态环境的变化具有重要现实意义.基于高分辨率卫星影像的遥感变化检测技术是滨海湿地精细化变化监测的一种有效手段,但目前大多数研究仅利用单源遥感数据进行变化监测,较少综合利用多源遥感数据的互补性,从而制约了变化监测精度.光学影像光谱信息丰富,但不能穿透植被冠层.合成孔径雷达(synthetic aperture radar ,SAR)具有穿透力强,能够探测植被水文特征等优点,克服了光学影像在湿地变化监测中的局限性. 相似文献
11.
稀少控制条件下的SPOT 5 HRS影像定向试验 总被引：1，自引：0，他引：1
通过生产试验,探讨了不同控制点数量及分布下的SPOT 5 HRS影像的定向精度问题,分析了稀少控制点定向后SPOT 5 HRS影像的误差分布情况,为SPOT 5 HRS影像在外业控制点获取困难地区的应用提供了可行方法。 相似文献
12.
Large area tree maps, important for environmental monitoring and natural resource management, are often based on medium resolution satellite imagery. These data have difficulty in detecting trees in fragmented woodlands, and have significant omission errors in modified agricultural areas. High resolution imagery can better detect these trees, however, as most high resolution imagery is not normalised it is difficult to automate a tree classification method over large areas. The method developed here used an existing medium resolution map derived from either Landsat or SPOT5 satellite imagery to guide the classification of the high resolution imagery. It selected a spatially-variable threshold on the green band, calculated based on the spatially-variable percentage of trees in the existing map of tree cover. The green band proved more consistent at classifying trees across different images than several common band combinations. The method was tested on 0.5 m resolution imagery from airborne digital sensor (ADS) imagery across New South Wales (NSW), Australia using both Landsat and SPOT5 derived tree maps to guide the threshold selection. Accuracy was assessed across 6 large image mosaics revealing a more accurate result when the more accurate tree map from SPOT5 imagery was used. The resulting maps achieved an overall accuracy with 95% confidence intervals of 93% (90–95%), while the overall accuracy of the previous SPOT5 tree map was 87% (86–89%). The method reduced omission errors by mapping more scattered trees, although it did increase commission errors caused by dark pixels from water, building shadows, topographic shadows, and some soils and crops. The method allows trees to be automatically mapped at 5 m resolution from high resolution imagery, provided a medium resolution tree map already exists. 相似文献
13.
14.
15.
16.
The relative abundance and distribution of trees in savannas has important implications for ecosystem function. High spatial resolution satellite sensors, including QuickBird and IKONOS, have been successfully used to map tree cover patterns in savannas. SPOT 5, with a 2.5 m panchromatic band and 10 m multispectral bands, represents a relatively coarse resolution sensor within this context, but has the advantage of being relatively inexpensive and more widely available. This study evaluates the performance of NDVI threshold and object based image analysis techniques for mapping tree canopies from QuickBird and SPOT 5 imagery in two savanna systems in southern Africa. High thematic mapping accuracies were obtained with the QuickBird imagery, independent of mapping technique. Geometric properties of the mapping indicated that the NDVI threshold produced smaller patch sizes, but that overall patch size distributions were similar. Tree canopy mapping using SPOT 5 imagery and an NDVI threshold approach performed poorly, however acceptable thematic accuracies were obtained from the object based image analysis. Although patch sizes were generally larger than those mapped from the QuickBird image data, patch size distributions mapped with object based image analysis of SPOT 5 have a similar form to the QuickBird mapping. This indicates that SPOT 5 imagery is suitable for regional studies of tree canopy cover patterns. 相似文献
17.
18.
This study presents an approach for the automatic extraction of dynamic sub-boundaries within existing agricultural fields from remote sensing imagery using perceptual grouping. We define sub-boundaries as boundaries, where a change in crop type takes a place within the fixed geometry of an agricultural field. To perform field-based processing and analysis operations, the field boundary data and satellite imagery are integrated. The edge pixels are detected using the Canny edge detector. The edge pixels are then analyzed to find the connected edge chains and from these chains the line segments are detected using the graph-based vectorization method. The spurious line segments are eliminated through a line simplification process. The perceptual grouping of the line segments is employed for detecting sub-boundaries and constructing sub-fields within the fixed geometry of agricultural fields. Our strategy for perceptual grouping involves the Gestalt laws of proximity, continuation, symmetry and closure. The processing and analysis operations are carried out on field-by-field basis. For each field, the geometries of sub-boundaries are determined through analyzing the line segments that fall within the field and the extracted sub-boundaries are integrated with the fixed geometry of the field.The experimental validation of the approach was carried out on the SPOT4 multispectral (XS) and SPOT5 XS images that cover an agricultural area located in the north-west section of Turkey. The overall matching percentages between the reference data and the automatically extracted sub-boundaries were computed to be 82.6% and 76.2% for the SPOT5 and SPOT4 images respectively. The higher matching percentage of the SPOT5 image is due to the fact that some of the boundaries present in the SPOT5 image were not detected in the coarser resolution SPOT4 image. For the SPOT5 image, of the total 292 fields processed, 177 showed a total agreement between the detected segments and the reference data. For the SPOT4 image, 154 fields showed a total agreement between the detected segments and the reference data. 相似文献
19.
以SPOT 5及ETM 遥感影像为基础数据,通过对云南昆明郊区利用PCA法和Brovey法进行影像融合,使融合后影像同时具有多光谱特性和高分辨率,提高影像的解译度。并对融合后的影像进行分类及精度分析,讨论影像融合技术在土地调查中的应用。 相似文献
20.
在影像数据融合、动态变化监测等遥感影像集成分析和应用中,将来自不同传感器、不同时相获取的影像高精度快速配准是其中的关键技术之一。本文提出了一种不同传感器、不同空间分辨率影像配准的全自动方法,并实际用于ＳＰＯＴ（全色）和ＴＭ（多波段）影像的配准,其精度、可靠性和效率等均明显优于传统的人工方法。 相似文献