Randy wrote:
Hi Frank and list,
I have several questions which are not relevant to GDAL/OGR itself, but
S-57 format.
Wish any hint, thanks!
NO.1
I’d like to know whether PRIM is as same as NAME_RCNM? If not, what’s
the difference between the two?
Randy,
Reviewing a WRECKS feature I see they are not, I have:
PRIM (Integer) = 1
NAME_RCNM (IntegerList) = (1:110)
NAME_RCID (IntegerList) = (1:498)
So, RCNM is 110 (isolated node) and PRIM is 1 (point feature). From
the include file:
/* -------------------------------------------------------------------- */
/* RCNM values. */
/* -------------------------------------------------------------------- */
#define RCNM_FE 100 /* Feature record */
#define RCNM_VI 110 /* Isolated Node */
#define RCNM_VC 120 /* Connected Node */
#define RCNM_VE 130 /* Edge */
#define RCNM_VF 140 /* Face */
/* -------------------------------------------------------------------- */
/* FRID PRIM values. */
/* -------------------------------------------------------------------- */
#define PRIM_P 1 /* point feature */
#define PRIM_L 2 /* line feature */
#define PRIM_A 3 /* area feature */
#define PRIM_N 4 /* non-spatial feature */
NO.2
I got some info via ogrinfo from a s-57 file(*.000). In a caution area
object(CTNARE),some fields are as follows:
PRIM=3---------------------------------------------------which means the
object’s geometry is a face, right?
Yes, it means it is an area feature.
NAME_RCNM=130-----------------------------------which means the vector
record’s type is edge, I guess. But the next three fields should exist
with a face vector record(5.1.3.3 chapter in S-57 Editon3.1 seems give
this hint, but I’m not sure it’s true.)
ORNT=2:2,2
USAG=2:1,1
MASK=2:255,255
Was there a question in here?
And another two questions:
NO.1
The field value in spatial records such as “NAME_RCID=2:25,413” has a
prefix “2:”, does it mean the field belong to spatial record not feature
record?
The fields NAME_RCID and and NAME_RCNM are list fields, so the first
value is the report is the count of items in the list followed by a
colon, and then the list of values separated by commas. It is just
a particular reporting format of the ogrinfo program.
NO.2
And why one is 25,and another is 413?Does it mean 25 is the ID in
spatial record and 413 is the ID in the whole record?
It presumably means there are two edge objects one with
RCID=25 and one with RCID=413.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
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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