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I am very new to using GIS software so apologies if this is a silly question. I am trying to build a virtual raster catalog to allow me to work with OS address base and codepoint data sets. Everytime i try to build the raster catalog file it is giving me an error saying "The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to invoke the program."

Any clues anyone?

Thanks in advance.

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You may want to mention what software you're using, and elaborate what you mean by on "OS address base and codepoint data sets" –  MappingTomorrow Jul 17 '12 at 9:24
    
I am using Quantum GIS 1.7.1 Wroclaw. The OS address base data is a seriers of TIF files with their corresponding georeferencing files .TFW. –  Sian Jul 17 '12 at 10:54
    
Codepoint Opendata from Ordnance Survey - ordnancesurvey.co.uk/oswebsite/products/code-point-open commercial code-point ordnancesurvey.co.uk/oswebsite/products/code-point/index.html –  Mapperz Jul 17 '12 at 13:41
    
Sian which Ordnance Survey products are you using? And what Software (ArcGIS) are you using? I have had experience with both. –  Mapperz Jul 17 '12 at 13:44
    
I am using QGIS and the OS data is code point and address base data sets. –  Sian Jul 17 '12 at 16:13
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1 Answer 1

I am intrigued as to why you are using a raster version of OS AddressBase as its most useful in its vector form. Ordnance Survey supply the product in either CSV or GML formats. Same goes for CodePoint (though that one is available as CSV or NTF).

However, format aside you are still facing an issue creating a VRT data set from the TIF files. The error message would suggest one of two things:

1) You are missing the necessary executable file 2) You dont have permission to write to the location you are trying to write the output to

Taking each one separately...

Missing Executable: Check to make sure you have the gdalbuildvrt.exe file in your QGIS installation directory as I believe this is what is used to create the VRT dataset. If the file is missing then you will need to install GDAL to get it and all the dependencies.

Output Location Permissions: Check to make sure the location you are trying to create the VRT has the right permissions set.

Hope one of these suggestions helps you out. If not perhaps you could post more details such as the steps you are following which might help us to try and replicate your issue.

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