On 4/15/2010 10:51 AM, Mark Brooks wrote:
I'm using PHP Mapscript. I need a point every X meters along the line.
Mark
Andy Colson wrote:
On 4/15/2010 10:24 AM, Mark Brooks wrote:
I have a line object that I need to to turn into points. How can I
create a series of points from the line object?
Mark
NC State University
A line has many many points. Which are you interested in? Just the
first and last? Any one point on the line? The mid-point? A point
every meter along the line? The closes point on the line to some other
object?
I know of two options:
1) use PostGIS:
select st_centroid(the_geom) from layer
2) use mapscript
-Andy
Does the line have a single start and end point? (a MULTILINE record
can have multiple lines (so multiple start and end points, all stuck
togethor).
In general, find the start and end points, use them to find the equation
of the line (y=mx+b if I recall correctly), then use that equation to
find one corrd based on another. (so, plug in a buch of x's to find
their y's).
-Andy
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