Question

Attributes on individual points in a line object

Forum|Forum|13 years ago
October 27, 2012
4 replies
72 views

brex

Hi! We have a situation here with the Norwegian exchange format, SOSI, where we are required to tag endpoints of lines that are connected (topological network model). SOSI is an "object oriented" ASCII format that supports/requires individual attributes on points in a line geometry. A line object with network topology tags ("KP") may look like this:

.KURVE 4:

..OBJTYPE Naturverngrense

..KVALITET 55 200

..NØ

653345946 44246946 ...KP 1

..NØ

653316800 44246600

653268800 44242400

653235000 44265200 ...KP 1

Does the FME data model (FFS) support this? Does the GML/Inspire data model represent similar challenges?

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+9

kathyross
Participant
Forum|Forum|13 years ago
October 29, 2012

FME'S native format (FFS) stores attribution and lists as it appears from the source file. So if a SOSI was read in that stored all of its attribution per point per line within a list, then the FFS would likewise store the list.

In FME's terminology, a line is a single object. It's individual points / coordinates are components of that line. Attribution of the points themselves could be stored within a list akin to how some existing FME readers have Format Attributes that are lists. e.g. some CAD formats.

Thus for your example network topology the attribution for that line could be:

sois_extended_data{0}.pointIndex = 1

sois_extended_data{0}.KURVE = 4

sois_extended_data{0}.OBJTYPE = Naturverngrense

sois_extended_data{1}.pointIndex = 2

sois_extended_data{1}.KURVE = 5

sois_extended_data{0}.OBJTYPE = Naturverngrense

etc.

Upvote

B

brex
Author
Forum|Forum|13 years ago
November 5, 2012

I think you answer is interesting Kathy although I'm not sure I understand it fully. Lets say my datasource is not SOSI, but I am producing SOSI from eg. an ArcSDE DB. This means the 'KP' network topology tag (for connection points) will need to be established in the workspace with the use of a custom transformer or other. Does your answer suggest that I will be able to store this new-found attribution - that references a particular point in a line segment - on that line segment in FME? And let me tell you, I'm not proud of that last sentence - what a mess.. I hope you understand;)