Sounds interesting Greg, can you provide any examples of how they look?
Are these shapes fixed within the IMC, or would there be scope for providing them during the map build process? When you say "scale with the chart scale", how would these shapes be different to any other shape provided as a shapefile polygon?

Matt

This is still in the works.

By scale with the chart scale, I mean that the locations of the points are defined in relative pixels from a central position rather than the locations of the points being defined as absolute positions.

The shapes are fixed with the IMC.

Hello Greg,

is there also any chance for such objects as here in picture or is the variety to high (i'm not a navigator)?

reefmaster.com.au/index.php/forum/beta-t...mc-ideas-wanted#1031

Thanks and best wishes
fjordfisher

fjordfisher wrote:
That's a sector light.

It's been coded in the IMC for a while but I broke it when I did extents clipping (to 85 S and 85 N).

Encoding is either as point or polygon feature...the extent issue forces it to be encoded as a polygon with a minor area, though (something that won't trivially filter - for example, a .0000000001 degree polygon). The initial point is either the first point in the polygon or the point's location.

"DRAW_OBJ" - CHARACTER field - "Sector Light"
"OBJ_SCALE" - NUMBER field - refers to the multiplicative scaling of the object...each level is 1/8 of normal size. (1-32; 8 is default)
"OBJ_ANGLE" - NUMBER field
"OBJ_ANGLE2" - NUMBER field
"COLOR" - NUMBER field
"BDR_COLOR" - NUMBER field
any other polygon specific fields you want

The extended lines are supposed to be drawn to the extent of the light range but since the object is defined in pixels, those need to be drawn as regular lines and not as a drawing object.

These are regular "Lights"

Hi Greg,

will this be compliant with S57 ? It would seem to imply that the apparent position will be able to move dependent upon scale - so querying an object may well give a position that is different to the position of the query.
Could you give me an example of the kind of funtionality you are hoping to achieve, then I may be able to think of some applications !

T

Hello,
I'm a new User.

I am active in the onshore and offshore surveying. My hobby is the boat and the mapping and programming of apps, plugins and i'm a PostGIS junky :-). I

I've seen the discussion and wanted to participate and make a proposal.
In the appendix you can see a light sector with the sectors illustrated and their color light.

Would it be possible to represent a sector light in this form

I have created a script for Postgis for the presentation. As a symbol in the symbol library that would of course even better.

AnglingCharts wrote:
This is all S 57 compliant for the rendering of the drawing objects.

The reference point of the sector light is defined by the origin of the sector light which means it is rarely balanced unless it's a 360 degree light. The reference point for the light is defined by the the very bottom of the ice cream cone shape which means it targets the location of the degree. The reference point of the filled arrow is the X/Y mid point of the arrow.

WoSo wrote:
I use a fixed distance to the color band of the sector light. It's possible to individually scale each color. I don't extend the angle lines beyond the color band...only to it unless it's a 360 degree light.

The fixed distance is ok. I have a parser of OpenSeaMap data written that creates the sectors with a PostGIS function as lines and polygons. Two days earlier, and I could have saved some work to me.

Thanks for your information

Sector Light Testing and Feathered Arrow Testing

Angle2 was left as a 0 degree boat approach angle with Angle1 and the color alternating

gpiverson wrote: Is this function available in the current stable version (0.6.6.0) or is it a beta feature? I could not find it in the manual.


fjordfisher wrote: I got an "Access Denied" error following this link, how do I get access to this topic?