5.2. Import Mesh |
This command allows the importing to MDT format mesh files in other formats A dialogue appears with the list of formats supported and, after selecting one of them, the program asks for one or more files: first those existing in the selected format, and then the file or files to be created in MDT format.
When selecting several files to import, it shows us a dialog where it is asked if you want to merge all the selected files into a single file. To be able to merge several files into one they have to have the same cell size, otherwise the application will warn that it cannot perform the merge.
If the answer to the previous question has been affirmative, the selected files will be merged into one, the application will ask for the name of the target file.
In the specific case of the GeoTiff format, and that the answer to the previous question has been negative, it shows us the following dialog as many times as files we have selected, where you can select an area to only convert the area that interests us.
Moreover, once the mesh has been converted, if the size of the same is excessively large we may execute the Resample Mesh command and change the size in accordance with our needs.
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Importing WCS
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WCS Services (Web Coverage Services) are systems for checking and downloading raster information with its original semantics. It not only enables users to view the image, but also accesses its properties, in other words, the checking of the values associated with each pixel.
The use of WCS services is only recommended to download data for specific areas, taking into account that the information received will be adapted in accordance with the framing and resolution of the client´s screen on which the request is submitted, as it resizes the pixel and its variable value accordingly.
Continuous variables in space, such as average temperatures, terrain altitude, soil water content, etc., the representation of which in vectors is less precise, are identified for the entire territory using the raster format with a value indicating the average value of the variable for each pixel.
On executing the command, a window appears with a list of the different services configured in the program. This list includes a Name to identify the service, and a Web address to which the request for the map can be made. Items can be added to the list by typing on the line marked with *. Moreover, we need to specify the design of the drawing, and if we wish to obtain an image that occupies the entire visible drawing area or designate a smaller window.
To select the design of the drawing, we need to click on the browse button and the following dialogue box will appear:
When the service requires basic authentication, we enter the Username and Password to access the service.
On clicking on the Next button, the program connects to the service selected from the list and another window appears in which to select the layers to be included in the image, in addition to the format. These options depend on the service selected.
On selecting a layer, a brief description of that layer appears.
We then name the downloaded file and choose the location by clicking on the corresponding button.
Clicking on the Download Map button executes the request for the image, and finally the program will request a file in which to save it. A second file will be created automatically with the image´s georeferencing data.
Once the image has been downloaded, the GeoTIFF format mesh import dialogue box appears automatically, as illustrated in the previous section, which will ask us for a location in which to save the generated .MDE file.