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Ph. Schilb.

30/06/2017 18:59:47

Hello, I am currently working on an Estuary flooding simulation, a rather large area. Sadly, I am not able to gain one large ASC file with the needed topographical data. but multiple. Now my question is how do I merge these files together into one. So, when I create the cross-section on the river they are continues through the neighbouring sections.

 

Thank you in advanced!

maspiers

03/07/2017 10:40:52

Best answer

You should be able to use QGIS (or other GIS software) to merge the .asc files together.

Bob

Flood Modeller Support

03/07/2017 11:28:21

In addition to using a specialist GIS software to merge grids, you might be able to get the result you need by using the "Superimpose Grid" tool in Flood Modeller. This can be found in the list of grid tools accessed from either the Toolbox or the Map Tools tab of the main toolbar. It can combine two grids into one new grid and, if there is any overlap, you can select which grid's data will dominate.

Regards
Bob

Ph. Schilb.

03/07/2017 20:24:50

Thank you very much for the advice!

Ph. Schilb.

21/07/2017 12:00:32

Have a slight carry on question. I have now merged most of the ASC files, sadly not able to create one large one due to file limitations in flood modeller, so when I am trying to use the superimpose grid method to adjust the size of the grid to include all of the model I get the error message "failed to complete!". Does anyone have an idea how to get around this?

 

Thanks in advanced

Bob

Flood Modeller Support

21/07/2017 15:35:58

How big is the merged file in terms of numbers of rows and columns? It could be a limit has been hit by your files (although I'm not aware of any limits existing in this tool). Also what do you mean you are using the superimpose grid tool to adjust teh size of the grid? The Resize and Resample tools I would have thought are better tools for changing the size of a single grid (in terms of extent and resolution).

The GIS functionality in Flood Modeller is not expected to provide the full functionality of a dedicated GIS package (Flood Modeller's main focus is always the modelling functionality). The superimpose tool currently in Flood Modeller is limited to combining 2 grids, so unfortunately it has to be used multiple times to merge multiple grids?

Regards

Bob

 

Ph. Schilb.

21/07/2017 17:23:51

Oh, got it sorted. Had to decrease the ASC scale by 5% in QGIS and then it loaded fine! thanks anyway.

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