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光栅数据有两种类型,color rasters,和数字光栅。In this article,we will inspect both a color raster,in this case,an orthophoto GeoTIFF,and a numeric raster,which will be a digital elevation model.
请记住,FME数据检查员只能查看您的数据,it cannot perform any transformations or translations to the data.
See how you can view RGB and DEM rasters in the FME Data Inspector.This video demonstrates GeoTIFF and CDED formats.Clicking a cell shows the pixel row and column,地面位置,and RGB / RGBA bands (color values) or DEM value (elevation data).Selecting the entire raster shows the coordinate system info,format-specific attributes,extents,决议,来源,information about each band,and other metadata.
06-07-NO.zip(contains the GeoTIFF)
1。启动FME数据检查员
Start the FME Data Inspector by clicking on the program icon with the magnifying glass.
数据检查器程序图标
2.打开数据集
Click on the Open Dataset tool (folder icon) in the upper left corner.For Format,type in GeoTIFF and select GeoTIFF (Geo-referenced Tagged Image File Format).For Dataset,browse to 06-07-NO.tif,单击“确定”添加数据。This GeoTIFF file is an orthophoto tile of Coal Harbour in downtown Vancouver,British Columbia.
在数据检查器中打开06-07-no.tif geotiff文件
Once the data is read in,请注意“显示控制窗格”中功能类型旁边的“1”。这证实了FME将光栅作为一个特征读取。
Note the "1" next to GeoTIFF indicates the raster is read in as one feature type
三。Query information about a single cell
By default,您的鼠标设置为“选择和信息”工具。单击光栅上的任意位置以查询单元格。一旦点击一个单元格,有关该单元格的信息将显示在“功能信息”窗格中。There is information about the row and column,地面位置信息,raster colors and band values.
选择单个单元格,only information about that cell is displayed in the Feature Information Pane
4.Query information for the entire raster
要选择整个光栅,click anywhere outside of the raster then hold your mouse and drag into the raster,a blue box should appear.You will know the entire raster is selected when a grid of dots appears over the entire image.
Using this method,选择整个光栅而不是单个单元,并且“功能信息”窗口为我们提供整个光栅的特性详细信息。We have coordinate system information,GeoTIFF specific attributes,extents,决议,来源,and specifics about each band.
Selecting the entire raster,information about the entire raster is displayed
Viewing and Inspecting a DEM Raster
1。打开dem-clipped.dem文件
在数据检查器中,单击“打开数据集”工具查看数字高程模型(DEM)。For Format type CDED and select the Canadian Digital Elevation Data (CDED) format.Then browse to DEM-Clipped.dem for the dataset.Click OK to view the data.
2.Query information about a single cell
In a numeric raster,each cell contains a numeric value for the specific geographic area covered by that cell.在这种情况下,the numeric value of each cell represents an elevation value.Click on various parts of the image to see how the elevation changes from black to light gray.Numeric raster - In the Feature information window the 'Band 0 (INT32)' value is the elevation value of the point selected
Selecting a single cell in a numeric raster displays information contained in the cell,这个是立面图
三。Query the entire raster
Using the technique mentioned in the previous example,选择整个光栅。In the Feature Information pane,会有关于坐标系的信息,extents,来源,cell spacing,决议,the number of bands,以及有关乐队的信息。
Selecting the entire numeric raster displays overall information about the raster
Data Attribution
此处使用的数据源于温哥华市,British Columbia.It contains information licensed under the Open Government License - Vancouver.
在下一个exercise,learn how to convert the GeoTIFF to JPEG,as well as how to reproject the raster into a new coordinate system.
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