[GRASS-dev] r.in.pdf

[roger at spinn.net]

It would certainly be possible to do so, but I don't think there is a way to 
do it without requiring the user to provide the geographic information. 

The script could provide for user input of the missing information.  
Alternatively the script could require that the user is in the correct 
mapset and has the right region boundaries for the map that will be 
imported.  In that case the script would use the region settings and the 
image resolution to build the world file. 

 

Mohammed Rashad writes: 

> what about making a script or program in addon for doing these operation in single click or command 
> 
>  --
> Rashad 
> 
>  
> 
> 
> ________________________________
> From: Roger Miller <roger at spinn.net>
> To: Mohammed Rashad <rashadkm at yahoo.com>
> Cc: grass-dev at lists.osgeo.org
> Sent: Mon, June 7, 2010 6:51:08 PM
> Subject: Re: [GRASS-dev] r.in.pdf 
> 
> I don't know enough about the pdf format to give you a comprehensive
> answer, but I can tell you what I've done in the past.  You will need
> more information than is inherent in the pdf; you need to know the
> projection of the map and you need the information to fit the map to its
> location. 
> 
> 1) use the utility pdftoppm to convert the pdf to a ppm file.  pdftoppm
> is not a GRASS utility, but is commonly included in linux distributions
> and is probably available for other systems as well. 
> 
> 2) convert the ppm file to a jpeg or tiff file.  This can be done with
> the common utilities ppmtojpeg or cjpeg, neither of which is part of
> grass. 
> 
> 3) construct a world file for the jpeg or tiff file.  You can find
> format information for the world file in Wikipedia. 
> 
> 4) use r.in.gdal to import the file to a location that is correct for
> the map's projection. 
> 
> Usually the difficult part in the process is getting the geographic
> information necessary to fill out the world file.  The process can be
> easily scripted, but it uses filters (pdftoppm and e.g. ppmtojpeg) that
> don't come with GRASS. 
> 
> 
> Roger 
> 
> On Mon, 2010-06-07 at 02:21 -0700, Mohammed Rashad wrote:
>>     I have a map in pdf format. i want to import the map in grass.
>> reading pdf map is available in ArcGIS. so I thought of developing and
>> contributing a module to GRASS GIS (r.in.pdf) to read maps in pdf
>> formats directly.I dont know where to start. will anyone please
>> provide me any information or links related to importing raster maps
>> into grass gis.how a map is processed when we perform r.in.* module on
>> the map?. How files are like cellhd,fcell etc are created in GRASS? 
>> 
>> any help, suggestion or comments are really welcome 
>> 
>> -- 
>> Rashad 
>> 
>>  
>> 
>> _______________________________________________
>> grass-dev mailing list
>> grass-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/grass-dev
>  
> 
>