[gdal-dev] reading VPF format NGA DNCs

[Christopher Barker]

Hi folks,

I'm trying to use gdal(ogr) to read NGA vector nautical charts, which 
are in the vector product format. However, I"m having no luck.

I tried this a while ago (and posted to this list) but gave up before I 
got it workign then. Here is that thread:

http://n2.nabble.com/OGR-and-VPF-td2033115.html

I have gotten a chart from:

http://www.nga.mil/portal/site/dnc/

It looks like have the right directory stgructure after unpacking it:

$ ls -l A1611290/
total 32
-r--r--r--    1 cbarker  cbarker  1117 Jan 15  2009 CAT
dr-xr-xr-x   50 cbarker  cbarker  1700 Jan 15  2009 CUL
dr-xr-xr-x   22 cbarker  cbarker   748 Jan 15  2009 DQY
dr-xr-xr-x   44 cbarker  cbarker  1496 Jan 15  2009 ECR
dr-xr-xr-x   18 cbarker  cbarker   612 Jan 15  2009 ENV
-r--r--r--    1 cbarker  cbarker   848 Jan 15  2009 GRT
dr-xr-xr-x   39 cbarker  cbarker  1326 Jan 15  2009 HYD
dr-xr-xr-x   33 cbarker  cbarker  1122 Jan 15  2009 IWY
dr-xr-xr-x   29 cbarker  cbarker   986 Jan 15  2009 LCR
-r--r--r--    1 cbarker  cbarker  1214 Jan 15  2009 LHT
dr-xr-xr-x    9 cbarker  cbarker   306 Jan 15  2009 LIBREF
dr-xr-xr-x   54 cbarker  cbarker  1836 Jan 15  2009 LIM
-r--r--r--    1 cbarker  cbarker   188 Jan 15  2009 LINEAGE.DOC
dr-xr-xr-x   29 cbarker  cbarker   986 Jan 15  2009 NAV
dr-xr-xr-x   45 cbarker  cbarker  1530 Jan 15  2009 OBS
dr-xr-xr-x   29 cbarker  cbarker   986 Jan 15  2009 POR
dr-xr-xr-x   22 cbarker  cbarker   748 Jan 15  2009 REL
dr-xr-xr-x   13 cbarker  cbarker   442 Jan 15  2009 TILEREF


but I can't get orginfo to recognize it:

$ ogrinfo A1611290/
FAILURE:
Unable to open datasource `A1611290/' with the following drivers.
...
   -> OGDI

so I do have the OGDI driver installed (I'm using teh Kyng Chaos build 
on OS-X)

I've also tried all of these:

$ ogrinfo gltp:/vrf/A1611290
$ ogrinfo gltp:/vrf/A1611290/
$ ogrinfo gltp:/vrf/A1611290/DAT

$ ogrinfo gltp:/vrf/a1611110
  note that I lower-cased that one

If I try gdalinfo, I get the following error:

$ gdalinfo gltp:/vrf/a1611110
ERROR 1: Can't open CAT file, invalid VRF database
gdalinfo failed - unable to open 'gltp:/vrf/a1611110'.

there is indeed a CAT file there.

Any ideas?

Thanks,

-Chris

PS: I can send you that chart as a 644kb zip file, if anyone wants to 
try it.

-- 
Christopher Barker, Ph.D.
Oceanographer

Emergency Response Division
NOAA/NOS/OR&R            (206) 526-6959   voice
7600 Sand Point Way NE   (206) 526-6329   fax
Seattle, WA  98115       (206) 526-6317   main reception

Chris.Barker at noaa.gov