Hi Russell,
I haven't tried it out yet...but here is what I'm thinking.
Given you have your photocenter and flight line numbers, I would
probably try to do the following;
1) Use the point connector to create new flight lines grouped by
flight line number.
2) Now if you use the coordinateconcatinator to get a listing of your
coordinate in a single attribute.
3) Use the attribute splitter to create a list of each xyz coordinate.
4) The list will represent your photocenters
5) I was thinking you could use the index number list{0}, list{1},
list{2} etc.....as an incremental position number along a flight line
You could use the index number to add to your start frame count.
start frame number = 21
ie list index{0} + start frame = 21
list index {1} + start frame = 22
list index {2} + start frame = 23
etc.
You will need to test for vector direction when you use the point
connector to ensure the start frame is the "from_node" and the end
frame number is at the "to_node"
So with your photocenters and flight line information, I think you
should be able to get the incremental frame count you desire.
Ken
--- In [email protected], "Russell MILLER" <[EMAIL PROTECTED]> wrote:
>
> Ken,
>
> Talk about different ways to skin a cat!
>
>
>
> My original data is a csv file and I create my photo coverages using a
> bufferer and value mapper based on photo scale but the results are the
> same. I'd like to try the 2d box replacer you mentioned.
>
>
>
> If your first point is #1 and last point is #10 and you have created 2
> through 9, how do you add the attribute that describes the points as 2
> through 9?
>
>
>
> Thanks for the response.
>
>
>
> Russell
>
>
>
> ________________________________
>
> From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of
> kcheng888_007
> Sent: Friday, 29 September 2006 6:08 AM
> To: [email protected]
> Subject: [fme] Re: Creating intermediate points along a line
>
>
>
> Hi Russell,
>
> The application you are building sound very similar to what I am doing
> now.
>
> Here is the information I have to work with;
>
> 1) a file consisting of two point lines representing flight lines
> 2) A text string on each flight indicating the frame start and frame
> end and and bunch of other info.
>
> I am using the densifer method mentioned in other posting.
>
> Here is what I did to get equal distance points along a line string.
>
> 1) All my flight lines were in a dgn file. Use Neighborfinder to
> find the text string closest to the flight line. The text string
> contained the roll number, frame start, frame end values, location,
> etc, etc, etc.
> 2) Separated the text string to get frame start and frame end.
> 3) calculated the number of frames for each flight line using
> expressionevaluator
> 4) calculated the length of the each flight line.
> 5) now with the frame count and flight line length you can calculate
> the distance between photo centers on each flight line.
> 6) Use Densifer and add vertices to each flight line based on distance
> between photo centers. USING THE DENSIFER WILL ONLY WORK IF YOU YOUR
> LINES HAVE ONLY A START POINT AND END POINT.
> 7) Use the chopper with VERTICE parameter set to 1. This will give
> you the photo centers as points.
> 8) now if you want to segment your original flight line you can use
> the pointonlineoverlay and this will "cut" your flight line to each
> photocenter.
>
> With your flight lines and photocenters, you can start creating your
> photo foot prints if you want with the 2D box replacer and the rotater
> transformer.
>
> Ken
>
> --- In [email protected] <mailto:fme%40yahoogroups.com> , "Russell
> MILLER" <Russell.Miller@> wrote:
> >
> > Dale, timely response, I've been at this all day and making progress.
> >
> >
> >
> > Setting some terminology and history might be useful here. This is an
> > aerial photogrammetric application. It's easy to picture an aircraft
> > flying back and forth creating "runs" and shooting photos along the
> way.
> > The points are the centres of the photos, the lines are the flight
> runs.
> > The reason we have this problem is because we are working with old
> > photography going back to the 2nd WW when airborne DGPS did not exist,
> > so in order to make spatial data sets we have to create the meta data
> > for each point (photo).
> >
> >
> >
> > I could not make the densifier work so have moved on to the
> > labeller/coercer route. I have successfully calculated the interval by
> > calculating the length along a line connecting the points and dividing
> > by the Last Point number less the First Point number less 1.
> >
> > Interval = ((Last Point number - First Point number)-1)
> >
> >
> >
> > Once that is done I then produce, as you suggested, labels with
> > "interval" and offset to zero. Using Coercer to change to point
> geometry
> > it's all good at this point.
> >
> >
> >
> > The next step is causing problems. That is renaming the newly created
> > points to their true number. The labeller assigns whatever attribute I
> > give it so they all come out the same. I need to create procedure that
> > checks the First Point adds "1" to it, creates a new attribute for
> that
> > point, moves to the next point adds "1" to the previous point, creates
> a
> > new attribute and goes through the line of related points. When the
> > points on the line are done, the next line of points is started and
> the
> > procedure continues through the data set. Then I could remove/rename
> > attributes to suit.
> >
> >
> >
> > You can see what we are trying to accomplish by going to:
> >
> >
> >
> > http://www.ntlis.nt.gov.au/imfPublic/airPhotoimf.jsp
> <http://www.ntlis.nt.gov.au/imfPublic/airPhotoimf.jsp>
> >
> >
> >
> > Thanks again,
> >
> >
> >
> > Russell
> >
> >
> >
> >
> >
> > ________________________________
> >
> > From: [email protected] <mailto:fme%40yahoogroups.com>
> [mailto:[email protected] <mailto:fme%40yahoogroups.com> ] On Behalf
> Of Dale
> > Lutz
> > Sent: Thursday, 28 September 2006 2:29 PM
> > To: [email protected] <mailto:fme%40yahoogroups.com>
> > Subject: Re: [fme] Creating intermediate points along a line
> >
> >
> >
> > Hi Russell,
> >
> > I'm not quite sure I understand how the interval should vary for you.
> > Is it a function of the length -- perhaps if you can provide more
> > details on how you'd like the interval calculated we can give some
> > input.
> >
> > Its an interesting application indeed. Perhaps the labeller may be
> > what you need rather than the densifier, let us know if you run into
> > difficulties.
> >
> > Dale
> >
> > On 9/26/06, nichols2bdarwindpi <Russell.Miller@
> > <mailto:Russell.Miller%40nt.gov.au> > wrote:
> > >
> > > Thanks for ideas on creating the points along a line. One more thing
> > > to consider. I have 1oo's maybe a 1000 of these to do and need to
> > > automate the interval calculation. The points are numbered in
> > > sequence along the line so the total number of points I need to add
> > is
> > > =(the last point number - the first point number)-1. I'm attempting
> > to
> > > use ExpressionEvaluator to do the calculation but can't figure out
> > the
> > > expression.
> > >
> > > This represents aerial photography flight lines. The first photo
> > taken
> > > is given a number and the rest follow in sequence. I have been given
> > > the first and last frame of each "run" and need to calculate the
> > > frames along the run.
> > >
> > > Thanks for helping out with this.
> >
>
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