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中国科学院博士 主要从事遥感机理、定量反演、数据处理以及GIS应用研究。ArcGIS、Envi 、ERDAS、Ecognition软件、IDL语言、6S、SAIL

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ENVI 5 Service Pack 3 新功能  

2013-07-27 19:00:39|  分类: 软件操作 |  标签: |举报 |字号 订阅

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中文文档来自http://blog.csdn.net/esricd/article/details/9066495

引文文档来自http://www.exelisvis.com/MyAccount/TabId/175/ArtMID/890/ArticleID/12391/ENVI-5-Service-Pack-3.aspx

1、传感器,数据格式,元数据

·???????? ENVI读取和显示图像从以下传感器:

·???????? LANDSAT-8

·???????? EO-1 ALI和Hyperion

·???????? NPP VIIRS

·???????? DubaiSat

·???????? Pleiades Level-1B

·???????? RapidEye Level-1B GeoTIFF文件的元数据;ENVI 以往只单纯的支持NITF L1B数据格式。

·???????? LANDSAT-8和EO-1数据的辐射校正工具。

·???????? 当打开NPP VIIRS文件时,首先选择校正数据的辐射率,反射率,亮度温度,反照率(取决于产品的类型和可用波段)。其次可选择具有地理参考的原始图像和经过校正的领结可视化结果。

·???????? “工具箱”中包含一个新的条目:几何校正>重投影GLT与领结校正。该工具目前只应用于NPP VIIRS图像,如果该数据包含了经纬度数据,利用此工具可对元数据进行地理校正。如果NPP图像还包含质量带,可采用此工具移除此领结效果。

·???????? 创建一个文本文件的元文件,该元文件包含的图像文件名称和/或作为虚拟文件波段的名称 ??。当对选择的元文件进行输入或处理时可采用File > Open完成, ENVI可从单个磁盘文件中检索读取图像数据, 如果这些数据属于同一个元文件,则可对其进行处理操作。

·???????? 利用ENVI API 的ENVI::OpenRaster方式打开远程的数据集。

·???????? 新标准的ENVI头文件中的元数据字段:

o?? 数据增益值:每个波段的增益值。单位W/(m2 * μm *sr)。

o?? 数据偏移值:每个波段的偏移值。

o?? 数据反射率增益值:数据反射增益值的数组。

o?? 数据反射率偏移值:数据反射便宜值的数组。

o?? 产品类型:对于WorldView和QuickBird产品,有效值包括基本产品,立体产品,标准产品,正射校正产品,以及数字高程模型产品。对于NPP VIIRS产品,其有效值包括EDR和SDR。

o?? 读取程序:可自定义读取空间与波谱数据的路径。

o?? 反射率比例因子:将反射率值从0-1进行划分。比如:如果数值10000在影像数据中代表一个反射率值1.0,则输入反射比例因子为10000。

·???????? ENVI可以在Macintosh和Linux操作系统上读取PNG格式。同时亦包括显示一些Web地图服务(WMS)数据集的图例。ENVI以往读取PNG格式只能在Windows操作系统上。

·???????? 如果ALOS PALSAR地理数据集(GR,特别是1.0,1.5和4.1级),包括一个.meta文件,ENVI提取其影像采集时间和伪地图信息。

·???????? 连接点在GeoTIFF图像中被用来计算模型转换的元数据标记,从而在ENVI中将地理参考的影像显示到伪(非标准)投影坐标。

·???????? 用 ENVI打开包含有正确标准投影元数据的GeoTIFF文件时,可对其进行可自动地理校正。如果存在唯一的有理多项式系数(RPC)的信息,将要使用的地理参考的数据。如果一个准的GeoTIFF文件只包含modeltransform的的元数据标签,但没有RPC或标准地图信息,然后的ENVI写入伪地图信息的文件。只要该文件文件包含有RPC信息,即可用于数据的地理校正操作。如果GeoTIFF文件仅仅包含有模型转换头文件标签,不包含RPC文件或标准地图信息,则ENVI需要将其伪投影信息添加到数据文件中。

·???????? 当ENVI利用旋转和标准地图投影读取GeoTIFF图像时,ENVI可以将其保存到GeoTIFF格式,同时保留旋转设置。

·???????? 对于TIFF和GeoTIFF图像文件,可使用Edit ENVI Header 工具或者文本编辑器来创建一个ENVI头文件(.hdr)以覆盖系统默认的元数据字段。例如,可以更改默认的数据拉伸方式更好显示的数据,或者在明确 TIFF/GeoTIFF元数据文件中的波段信息错误的情况下,修改其波长信息。一旦将这边修改信息保存,当重新打开图像文件时,ENVI将读取新的元数据值。

·???????? 对于给定的图像有不同类型的地图信息时,有一个优先级的存在。如果图像包含标准的地图信息,以及RPC或伪信息时,标准地图信息将用来作为主要的空间参考,RPC和为地图信息将被作为辅助空间参考。如果将此文件保存到ENVI格式,ENVI将RPC信息添加到头文件中。如果图像包含RPC和伪的地图信息中,RPC信息将被用来作为主要的空间参考。如果影像包含有RPC文件以及伪地图信息时,RPC信息将呗作为主要的空间参考。

·???????? 如果文件中包含RPC或伪地图信息时,当前光标所在位置的经度和纬度以度/分/秒显示。

·???????? ENVI目前不支持带有地理查找表(GLT)的影像从地理坐标到标准地图投影的显示。

·???????? ENVI API新增了ENVI Raster Spatial Ref GLT对象。这是一个与ENVI Raster相关联的GLT空间参考。

·???????? 如果用户显示通过Remote Connection Manager打开的Esri? Image Servic显示的图像(设置基本坐标系显示)时,影像服务请求默认情况下将使用相同??的坐标系。必要时可更改默认影像服务坐标系。

·???????? 当用户通过Remote Connection Manager访问镶嵌数据集(通过ESRI? Image Services)时,可选择不同的选项,输入栅格的显示和排序。这些选项只有安装了ArcGIS Desktop 10.1才可使用。

·???????? 新的NITF参数设置:设置为True时,如果裁剪一个NITF C8图像,ENVI将通过从NITF文件获取原始每个像素位(ABPP),而不是从裁剪的图像上创造新的NITF C8统计(ABPP,NBPP,HISTOA:OBPP,和SOC :: SIZ :: SSIZ)。默认设置为FALSE。

2、图像处理

·???????? Image to Map校正工具可通过Toolbox完成。

·???????? 在Viewshed Analysis workflow可视化分析工作流程中,可见区域绿色表示。不可见的或不确定的区域红色表示。

3、用户界面

·???????? Image to Map校正工具可通过Toolbox完成。

·???????? 指北针参数设置:允许用户自定义指北针类型以及默认位置的显示。

·???????? 指针、多边形和折线的注记默认粗细为3个像元,可使其线条粗细可见。

·???????? 当用户放大或缩小到任意比例尺范围,填充多边形数据都可精确显示。

·???????? 线和多边形的可视化质量有所改善。

·???????? 无论底层显示数据是正向或者旋转的,符号注记、椭圆注记和矩形注记最初以轴正交方式显示。文本注释最初以水平绘制显示。

·???????? 矢量属性对话框:如果一个矢量属性拥有超过256的值,选中的颜色表均等地分给属性的数值,从而创建一个颜色渐变。如果用户想用颜色表重复256个属性的每次迭代,可选择Cycle Color Table选项完成。

·???????? 在新的Display General参数设置中对于特殊的数据类型,用户可设置其独特的默认拉伸类型:

o?? 图像默认的8 ??bit拉伸

o?? 无整型符号图像默认的16 bit拉伸

o?? 所有其他图像的默认拉伸

·???????? 如果用户将当前视图添加显示到ppt上,当前视图数据的中心地图信息,地理坐标会被添加到演示幻灯片上。

·???????? 如果用户未从主应用程序选择Layer Manager或者Toolbox,可通过以下几个方式进行选择:

o?? 浮动对话框中点击方形图标

o?? 在主应用程序中点击向右的箭头(用于隐藏和显示面板相同的箭头)

o?? 点击浮动对话框右上角的X按钮

·???????? 通过File > OpenFile > Open As 打开的文件在File > Open Recent下可以很容易获取当前已经存在或将要打开文件。

·???????? 从菜单栏中选择File > Close All 关闭所有文件。ENVI将从Data Manage和Layer Manager中移除所有文件。

·???????? Windows用户可以从ArcMap?,ArcCatalog?或Windows文件管理器中拖拽文件到多个视图中。也可从数据管理拖拽文件到任何视图中。

·???????? 如果有多个视图窗口,用户可从Layer Manager拖拽栅格,矢量或注记图层到任意的显示窗口或者相应的Layer Manager视图图标。这将创建一个图层的副本来显示视图。

·???????? Data Manager具有一个Load Grayscale按钮,用户可快速点击显示影像数据的单个波段

当用户在菜单栏中点击Help > About后可显示ENVI或者ENVI EX的许可证/安装数量。用户可通过这些许可证/安装数量联系技术支持服务

Sensors, Data Formats, and Metadata

  • ENVI reads and displays imagery from the following sensors:
    • Landsat-8
    • EO-1 ALI and Hyperion
    • NPP VIIRS
    • DubaiSat
    • Pleiades Level-1B
    • RapidEye Level-1B GeoTIFF files with metadata; ENVI used to support only Level-1B files in NITF format.
  • The Radiometric Calibration tool now calibrates Landsat-8 and EO-1 data.
  • When you open an NPP VIIRS file, you have options to calibrate the data to radiance, reflectance, brightness temperatures, or albedo (depending on the product type and available bands). You can also choose to georeference the raw imagery and correct for "bowtie" visual artifacts.
  • The Toolbox contains a new entry: Geometric Correction > Reproject GLT with Bowtie Correction. This tool currently only works with NPP VIIRS imagery and lets you georeference the raw imagery if it contains Latitude and Longitude bands. If the imagery also contains a Quality band, you can choose to remove bowtie visual artifacts from the imagery.
  • You can create a meta file, which is a text file that contains the names of image files and/or bands to treat as one virtual file. When you later select the meta file for input or processing using File > Open, ENVI retrieves the image data from the individual disk files and treats them as if they were part of the same input file for processing.
  • You can open remote datasets from the ENVI application programming interface (API) using the ENVI::OpenRaster method.
  • The following are new standard metadata fields in ENVI header files:
    • data gain values: Gain values for each band. Units are W/(m2 * μm *sr).
    • data offset values: Offset values for each band.
    • data reflectance gain values: An array of data reflectance gain values.
    • data reflectance offset values: An array of data reflectance offset values.
    • product type: For WorldView and QuickBird products, the valid values include Basic Product, Stereo Product, Standard Product, Orthorectified Product, and Digital Elevation Model Product. For NPP VIIRS products, valid values include EDR and SDR.
    • read procedures: Spatial and spectral read routines that define custom file readers.
    • reflectance scale factor: The value that, when divided into your data, would scale it from 0 to 1 reflectance. For example, if the value of 10,000 in your data represents a reflectance value of 1.0, enter a reflectance scale factor of 10,000.
  • ENVI can read the PNG format on Macintosh and Linux operating systems. This includes legends that are displayed with some Web Mapping Service (WMS) datasets. ENVI previously read the PNG format on Windows operating systems only.
  • If ALOS PALSAR georeferenced datasets (GR, specifically levels 1.0, 1.5, and 4.1) include a .meta file, ENVI extracts the acquisition time and pseudo map information, if available.
  • Tie points in a GeoTIFF image are used to compute a modeltransform metadata tag, which is used to georeference the image to a pseudo (nonstandard) projection in the ENVI display.
  • ENVI automatically georeferences GeoTIFF files that contain standard map projection metadata when it opens the files. If only rational polynomial coefficient (RPC) information exists, that will be used to georeference the data. If a GeoTIFF file only contains a modeltransform metadata tag but no RPC or standard map information, then ENVI writes pseudo map information to the file.
  • When ENVI reads GeoTIFF images with a rotation and standard map projection, it can save them to GeoTIFF format while retaining the rotation setting.
  • For TIFF and GeoTIFF image files, you can optionally use the Edit ENVI Header tool or a text editor to create an ENVI header file (.hdr) to override the default metadata fields. For example, you can change the default stretch type to better visualize the data or you can change the wavelength information if you know that it is wrong in the original TIFF/GeoTIFF file. Once you save the changes to a header file, ENVI will read the new metadata values when you re-open the image file.
  • A precedence now exists when different types of map information are available for a given image. If an image contains standard map information plus RPC or pseudo information, the standard map information will be used as the primary spatial reference and the RPC or pseudo information will be used as the auxiliary spatial reference. ENVI will write RPC information to the header file if you save the file to ENVI format. If the image contains RPC and pseudo map information, the RPC information will be used as the primary spatial reference.
  • If files contain RPC or pseudo map information, the status bar displays the latitude and longitude of the current location of the cursor in Degrees/Minutes/Seconds.
  • ENVI currently does not allow a geographic lookup table (GLT)-based image to be displayed along with an image georeferenced to a standard map projection.
  • The ENVIRasterSpatialRefGLT object was added to the ENVI API. This is a reference to a GLT spatial reference associated with an ENVIRaster.
  • If you display an image (which sets the base coordinate system of the display) before opening an Esri? Image Service through the Remote Connection Manager, the Image Service request will use the same coordinate system by default. You can change the default coordinate system of the Image Service, if needed.
  • When accessing mosaic datasets (via Esri? Image Services) through the Remote Connection Manager, you can choose from various options for displaying and ordering the input rasters. These options are only available if you have ArcGIS Desktop 10.1 installed.
  • A new NITF preference is available: . If set to True, ENVI will pass through the bits per pixel (ABPP) if you chip a NITF C8 image. Instead of creating new NITF C8 statistics (ABPP, NBPP, HISTOA:OBPP, and SOC::SIZ::Ssiz) from a chipped image, ENVI will pass them through from the original NITF file. The default setting is False.
Image Processing

  • The Image to Map Registration tool is available through the Toolbox.
  • In the Viewshed Analysis workflow, visible areas are colored green. Non-visible or undetermined areas are colored red.
User Interface

  • The Image to Map Registration tool is available through the Toolbox.
  • A new set of North Arrow preferences allows you to customize the appearance and default location of north arrows in the display.
  • Arrow, polygon, and polyline annotations have a default line thickness of three pixels, which makes them more visible.
  • Filled polygon shapefiles display accurately when you zoom in or out at any map scale.
  • The visual quality of lines and polygons has improved.
  • Symbol, ellipse, and rectangle annotations are initially drawn orthogonally to the display axes, regardless of the orientation (rotation) of the underlying data layer. Text annotations are initially drawn horizontally with respect to the display.
  • Properties dialog for vectors: If a specific vector attribute has more than 256 unique values, the selected color table is equally divided among the number of attributes, creating a color gradient. Select the Cycle Color Table option if you want the color table to repeat itself with each iteration of 256 attributes.
  • New Display General preferences are available to let you set unique default stretch types for specific data types:
    • Default Stretch for 8-bit Imagery
    • Default Stretch for 16-bit Uint Imagery
    • Default Stretch for All Other Imagery
  • If you chip the display to a PowerPoint presentation and the source image contains map information, the geographic coordinates of the center of the chipped view are added to the Notes field in the presentation.
  • If you un-dock the Layer Manager and/or Toolbox from the main application, you can re-attach them by using one of the following options:
    • Clicking the square icon in the floating dialog
    • Clicking the right-facing arrow (the same arrow used to hide and show panels) in the main application
    • Clicking the X button in the upper-right corner of the floating dialog
  • Files that you opened recently using File > Open or File > Open As are available under File > Open Recent for easier access in the current or future ENVI sessions.
  • To close all files, select File > Close All from the menu bar. ENVI removes the files from the Data Manager and Layer Manager.
  • Windows users can drag and drop files from ArcMap?, ArcCatalog?, or the Windows File Manager into multiple views. You can also drag and drop files from the Data Manager to any view.
  • If you have multiple views displayed, you can drag-and-drop raster, vector, or annotation layers from the Layer Manager to any one of those views in the display or to the corresponding view icons in the Layer Manager. This creates a copy of the layer(s) to populate the views.
  • The Data Manager has a Load Grayscale button to let you quickly display a single band of image data.
  • Your ENVI or ENVI EX license/install number is displayed when you select Help > About from the menu bar. You will need this license/install number when contacting Technical Support.
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