[mapserver-users] DNC's

[Frank Warmerdam]

Derek Bain wrote:
> Hi
> 
> I am trying to get the color for each symbol/layer within a DNC. Using 
> ogrinfo I can get the f_code for each layer however I cannot find the 
> symbol number stored anywhere. Using document MIL-DTL-89045 I can get a 
> table of symbol number mapped to color. However I need, if possible,  to 
> find a way of getting the symbol number from the DNC files OR a means of 
> mapping f_code to color so I can complete the map file. I tried 
> specifying STYLEITEM "AUTO" in one of my Layers to use the default 
> colors within the layer but that does not seem to be supported by OGR 
> and results in a white/blank image (tried empty Class). I have also 
> tried searching through the files for a specific symbol number with no 
> success.
> 
> Has anyone any ideas of how to do find the symbol number

Derek,

STYLEITEM "AUTO" is supported for a few OGR formats (Mapinfo, and DGN for
instance), but not for anything via the OGDI gateway.

I presume you are seeing attributes like this on your DNC features?


OGRFeature(coastl at ecr(*)_line):0
   id (Integer) = 1
   f_code (String) = BA010
   acc (Integer) = 1
   slt (Integer) = 15
   tile_id (Integer) = 1
   edg_id (Integer) = 2

That's all I get anyways.  I'm afraid I don't know how to get the symbol
number.  Either it isn't in the dataset or the OGDI VRF/VPF driver is not
picking it up in association with the features.

I am attaching the metadata output from the ogdi_info command for my DNC
dataset in case it might have something useful for you.  It does, for instance,
associate longer text for the f_code values.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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