3. Technical Hinst and Tipsに関するFAQ
Q•XYZデータの読み込み方(Q3.1 - How do I load XYZ data?)
There are typically two kinds of XYZ data, gridded and ungridded. Choose dmagic to import gridded data and avggrid to import ungridded data.
Avggrid is used to import ungridded data. Avggrid can be started from DMagic using the "File -> Import XYZ Data" menu item. Once in avggrid, select "File -> Add File to Grid..." to select the file(s) you would like to import. Select the desired gridding parameters, in particular set the Cell Size to an appropriate value for your dataset, then click "Scan File." Now avggrid will show the bounds and size of the dataset. Process the data into a DTM by first clicking "Convert," then exporting the file (File->Export DTM/GEO file...). For more details, see the manual http://www.ivs.unb.ca/docs/S05-Average_Grid.pdf. You can also view the DTM by clicking on the "Plot DTM" button on the bottom row.
DMagic is similar, but is used to import gridded data. Select "File->Import Surface" and select the desired file. Next pick the file type, choose the desired parameters such as cell size from the righthand panel, click "Scan for Information," and then choose "Convert and Save File" to save the new DTM.
Q•ArcViewファイルの読み込み方(Q3.2 - How do I load an ArcView shape file?)
You can use Fledermaus to import an ArcView shape file. In Fledermaus, select "File -> Import Data -> Import Arcview...," enter the required file names, then click "Convert Selected File." This will create a lines object which you can load directly into Fledermaus. There is also a command line applet called "arctolines" that will do the conversion to a lines object.
Q•イメージファイルの読み込み方(Q3.3 - How do I load images?)
Images can be loaded into a scene in Fledermaus. Also, an image can be draped on a DTM using DMagic or the mktextureDTM applet. There are several ways that you can import an image:
- draped on a DTM in dmagic or mktextureDTM
- georeferenced to a portion of a DTM using dmagic
- horizontally or vertically in Fledermaus
In DMagic, select "File->Import Image...." Enter the file name or browse using the arrowhead icon. Choose whether to rescale the image to the size of the DTM or to match georeferenced regions. In the latter case, enter the georeferencing data for the image and the resampling filter desired. In both cases, enter the output file name and select the DTM to process.
In Fledermaus, select "Data->Import Image" or "Data->Import Vertical Image." In both cases, a new node will be added to the scene which you can select in the lower left panel. Selecting the image node will show the settings for the image in the Data Set Control panel. Here, you can enter the file name of the image or browse for the image by clicking on the arrowhead icon.
Q•マルチビームデータの処理について(Q3.4 - How do I process multibeam sonar data?)
The 3D Area Based Editing module in Fledermaus is based on the PFM data structure developed at the US Naval Oceanographic Office. The PFM structure allows the load of a variety of common multibeam formats for visualization and editing. These include GSF, Caris HDCS, SHOALS out and wav files, HTF and ASCII XYZ plus attribute data. The PFM is meant to be a temporary structure used to optimize data for area based editing and can be removed once all editing is complete.
3D Surface Area Based Editing allows better decision making since all of the data is visible in a certain area, not a subset, and editing decisions can be made much quicker and more accurately than single line/swath based editing.
The typical method of using PFM is to load data from an existing format to the optimized PFM structure, process, edit the data, select soundings features and in Fledermaus, and then save the changes back to the original file. This scheme allows data to remain in its original form and does not require that all data be permanently changed to a new file format. It also provides a rigorous audit trail for verification.
For further details see Chapter 7 (Area Based Editing) of the manual.
Q•ポイントや線のデータを読み込むには？(Q3.5 - How do I load point and line data?)
In Fledermaus, select "Files -> Import Data -> Import Points" or "Files -> Import Data -> Import Lines." Select the input file, the format of the input file and any other information desired, then click "Convert."
Q•ムービーの作成方法(Q3.6 - How do I make a movie?)
There are four steps you must follow to successfully create a movie from your data. See Chapter 7 http://www.ivs.unb.ca/docs/S09-Movie_Tools.pdf for detailed instructions. The steps are:
- Generate a flight path in Fledermaus. Save both the scene and flight path (movie).
- Use "smoother" to smooth the flight path you have recorded and to set the length of the movie (in frames).
- Use "movieclient" to generate the individual frames of your movie. Right click and select Render... to start the process.
- Assemble the individual frames into a digital video. You can use "movieencoder" or third party software such as "movieconvert" on the SGI or "QuickTime Pro", "Adobe Premier" or similar on PCs.
Q•TIFFファイルを使用したムービーを作成するには？(Q3.7 - How do I assemble TIFF images into an MPEG or AVI?)
This is the last step in creating a flight path video (movie) (see Q12). You can use "movieencoder" or third party software such as "movieconvert" on the SGI or "QuickTime Pro" or "Adobe Premier" on PCs.
Q•透過した地層探査データを作成するには？(Q3.8 - How do I create transparent vertical sub-bottom images?)
The process of creating vertical sub-bottom images involves using the 'mkvcurtain' command line applet and optionally a 3rd party graphics editing package such as Photoshop. For a detailed explanation of the process for creating these images, please refer to the vertical_images.pdf technical document.