[postgis-users] Simple Line Density

Jeff Adams - NOAA Affiliate jeff.adams at noaa.gov
Wed Dec 26 04:58:43 PST 2012

Hi Brent,

Thanks for the response. I don't think your original response made it into
my inbox via the list, but now I see it on the website thread. That seems
like it might be a viable alternative, I just worry about those vessel
tracks that would be clearly outside of a particular grid cell, but whose
buffer would bleed over. How did you handle this type of situation?


On Mon, Dec 24, 2012 at 7:22 PM, <pcreso at pcreso.com> wrote:

> Jeff,
> Did you see my reply using vessel tracklines as vectors & a grid in
> Postgis to do exactly what you describe?
> Given we were looking at benthic impact, we buffered the tracklines to
> create polygons representing the swept area of the deployed fishing gear.
> These were clipped by the cells, & we could generate statistics suca as the
> cumulative swept area of all tracks with each cell, number of times each
> cell was crossed, & given the tracklines have a timestamp associated with
> them, we could also look at the temporal pattern of tracks crossing cells,
> for things like seasonal impacts & variation between seasons.
> Cheers,
>   Brent Wood
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