首页> 外文学位 >文献详情
【24h】

Natural disasters and long-term recovery: A baseline study of historical change and habitat structure of Juncus roemerianus marsh at Grand Bay, Mississippi.

机译:自然灾害和长期恢复:密西西比州格兰德湾的准cus猴沼泽历史变化和栖息地结构的基线研究。

获取原文
获取原文并翻译 | 示例

摘要

Ecosystem structure and function in a Juncus roemerianus dominated marsh in coastal Mississippi was investigated using remote sensing techniques. Rate of change in land cover types were computed from historical aerial photography (1940 to 2006) of the study area located in Kreole, MS. Baseline biodiversity and vegetation coverage were determined from in situ line intercept vegetation analyses. Post-classification difference maps for intervals between image time periods and baseline parameters were compared using 2006 vegetation transects and a 1 m resolution Digital Ortho Quarter Quadrangle (DOQQ) image as ground-reference. The ancillary photographs and digital imagery were rectified, digitized and interpreted from both analog and digital file formats using a combination of geospatial techniques. A Gaussian normalization technique provided a minimum standard deviation in pixel brightness among 1940, 1985 and 2006 images as compared to other image normalization techniques. Additional investigations were made from images with dates significant to Hurricane Elena (1985) and Hurricane Katrina (2005) storm events in coastal Mississippi. Data collected from Mahalanobis distance supervised image classification and simple value difference maps demonstrated that change in marsh structure did occur between pre and post-storms at the study area in Mississippi. A classification error matrix showed accuracies ranging from 46.80% in the 1940 classification to 91.96% in the 2006 ground reference. The supervised post classification percent change of natural marsh for the Hurricane Elena (1985) imagery was +5.25% Juncus roemerianus marsh, +2.47% pine hummock, +0.91% open-water, -7.14% salt panne, and +0.34% unclassified. The Hurricane Katrina (January 2004-March 2006) supervised post classification percent change was +13.62% Juncus roemerianus marsh, -13.3230% pine hummock, -2.90% open-water, +2.61% salt panne, and 0.0% unclassified. The percent change difference map for Hurricane Elena (natural) was 0%, 10.81%, 88.85%, and 0.34% respectfully with a mean of 2.8952% and standard deviation of 1.0683% across all classes. The Hurricane Katrina percent change difference was 0%, 11.68%, 88.32%, and 0% respectively with a mean of 2.8832% and standard deviation of 0.3212%. The overall pixel change in pre and post storm images from Hurricane Elena were 10.34% of the pixels (2811 m2) and 11.68% (3175 m2) for Hurricane Katrina.
机译:利用遥感技术研究了密西西比州沿海的一个以Juncus roemerianus为主的沼泽地的生态系统结构和功能。土地覆盖类型的变化率是根据位于密苏里州克雷奥尔的研究区域的历史航空摄影(1940年至2006年)计算得出的。基线生物多样性和植被覆盖度是根据原位线截距植被分析确定的。使用2006年植被样带和1 m分辨率数字正交四边形(DOQQ)图像作为地面参考,比较了图像时间段和基线参数之间的间隔的分类后差异图。辅助照片和数字图像通过地理空间技术的组合,从模拟和数字文件格式中得到纠正,数字化和解释。与其他图像规格化技术相比,高斯规格化技术在1940、1985和2006年的图像中提供了像素亮度的最小标准偏差。还对影像进行了进一步调查,这些影像的日期对密西西比州沿海的Elena飓风(1985)和Katrina飓风(2005)暴风雨具有重要意义。从马哈拉诺比斯距离监督图像分类和简单的值差图收集的数据表明,密西西比州研究区域的暴风前后,确实发生了沼泽结构的变化。分类误差矩阵显示的准确度范围从1940年分类的46.80%到2006年地面参考的91.96%。在Elena(1985)飓风图像的监督下,自然沼泽的分类后百分变化是+ 5.25%罗马古猿沼泽,+ 2.47%松树吊床,+ 0.91%裸露水,-7.14%盐pan和+ 0.34%未分类。卡特里娜飓风(2004年1月至2006年3月)监督的职等变化百分比为+ 13.62%君士革湿地沼泽,-13.3230%松树吊床,-2.90%裸露水,+ 2.61%盐pan和0.0%未分类。飓风埃琳娜(天然)的百分比变化差异图分别为0%,10.81%,88.85%和0.34%,所有类别的平均值为2.8952%,标准偏差为1.0683%。卡特里娜飓风百分比变化差异分别为0%,11.68%,88.32%和0%,平均值为2.8832%,标准偏差为0.3212%。对于Elena飓风,风暴前后图像的整体像素变化分别为卡特里娜飓风的像素的10.34%(2811平方米)和11.68%(3175平方米)。

著录项

  • 作者

    Wells, Tami Maureen.;

  • 作者单位

    University of South Alabama.;

  • 授予单位 University of South Alabama.;
  • 学科 Biology Botany.;Remote Sensing.;Biology Ecology.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 190 p.
  • 总页数 190
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 R914;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

联系方式:18141920177 (微信同号)

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号