Hi,
I am just thinking what could be cool to have, I do not have any
immediate need right now myself. However, I would say that the answer in
both. I have some ideas about improving the OpenJUMP GPS extension for
making OJ into a nice vector based moving map program. N nearest items
from a point would suit that use case. I mean queries like Find the
closest gas station / restaurant / streetname / maxspeed limit from my
current GPS location etc.
For more serious work with vector data sets, risk analysis and that sort
of things the N items nearest to selected item would probably be more
useful. And of course the selected item can be a point as well. Your
description makes me think that you have a ready tool for the latter use
case. It would be interesting to test it.
-Jukka Rahkonen-
________________________________
Larry Becker wrote:
Hi Jukka,
Do you want to find the N items nearest to a point or another
item? I have a tool that looks out a specified distance from a selected
feature and creates a new layer containing lines with arrowheads between
all of the features. It puts the length in an attribute so you can use
it as a label. You can then sort by the length attribute to get the N
nearest.
regards,
Larry B.
On Wed, Apr 20, 2011 at 7:44 AM, Rahkonen Jukka
<jukka.rahko...@mmmtike.fi> wrote:
Hi,
I can find nearest features by having a source layer and
a mask layer and doing a spatial query "is within distance" by
incrementally increasing the distance parameter. It would be nice to
have a tool or script for doing this automatically. Even better if the
number of features to be found could be given with another parameter and
the actual distance would be written into the attribute table of the
result layer. Has anybody done this yet?
The selection tool "Select Items by Circle from Selected
Layers" might be usable also if it could be done dynamic so that user
could click at the centre point and drag for giving the radius before OJ
performs the query.
I know I can do what I wand with PostGIS and I guess it
is doable in a similar way with Spatialite but sometimes it would be
handy to search nearest features from shapefiles simply from OJ map
window.
-Jukka Rahkonen-
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