On 04/25/2013 01:47 AM, [email protected] wrote:
Hi all,
I am working with relocations from a telemetry study. I want to
calculate the movement in meter over time along a physical boundary.
There a some methods to calculate the distance between points along a
line but since there are different individuals and the movement distance
has to be correctly calculated by time this does not seem to work for me.
The point-shape with 500 relocations of 30 individuals looks something
like this:
-------------
ind, date
1,2012-08-05
1,2012-09-07
1,2012-10-15
.
.
2,2012-08-05
.
-------------
I was thinking of creating a line-shape with a given chainage (splitted
every x meters?)
perform a buffer and finally an intersect with the point-shape. But
1.
how can I create a line-shape that is splitted every 10 meters..
2.
and how to write the chainage into the table
-------------
chainage
1.540
1.200
0.450
.
.
1.800
.
-------------
The resulting point-shape should look likes this:
-------------
ind, date, chainage
1,2012-08-05, 1.540
1,2012-09-07, 1.200
1,2012-10-15, 0.450
.
.
2,2012-08-05, 1.800
.
-------------
my approach seems to be a bit antiquated and clumsy
but I am capable of learning. Any suggestions or any mistake made by me?
Thanks,
Jens
My suggestion is to use use Postgis or Spatialite. What your trying deal
with is often called a Linear Referencing system.
Enjoy,
Alex
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