I am wondering whether GRASS has been used to create near real-time
display of vector maps with a street map (of a state or county) as the
background map (PNG map) and several layers of symbols on top of it.
These additional layers can be, for example, movement of a fleet of
vehicles (each type of vehicle as a separate layer). If we want to
create vector maps frequently with several thousand points (or vehicle
symbols) how responsive GRASS will be in terms of speed and memory
usage. Assume that we want to use mysql as the database and that the map
will be displayed on a web browser.
On Mon, 2007-07-16 at 14:37 -0500, Nithi, Nachi K (Karun) wrote:
Hi All,
I am wondering whether GRASS has been used to create near real-time
display of vector maps with a street map (of a state or county) as the
background map (PNG map) and several layers of symbols on top of it.
These additional layers can be, for example, movement of a fleet of
vehicles (each type of vehicle as a separate layer). If we want to
create vector maps frequently with several thousand points (or vehicle
symbols) how responsive GRASS will be in terms of speed and memory
usage. Assume that we want to use mysql as the database and that the map
will be displayed on a web browser.
I've considered this, but have done little regarding it. One option is
to have a WMS server that refreshes periodically. Or you could script
it in GRASS, but that really isn't what GRASS is for (not that there are
any limits on usage, but it seems like overkill).
Xastir is a simple application with real-time tracking that is used in
the amateur radio community. I use it to monitor positions of research
balloons and recovery teams (in relation to my own) for Stanford. I
must admit, though, the software needs some modernization.
--
Brad Douglas <rez touchofmadness com> KB8UYR/6
Address: 37.493,-121.924 / WGS84 National Map Corps #TNMC-3785
I am wondering whether GRASS has been used to create near real-time
display of vector maps with a street map (of a state or county) as the
background map (PNG map) and several layers of symbols on top of it.
These additional layers can be, for example, movement of a fleet of
vehicles (each type of vehicle as a separate layer). If we want to
create vector maps frequently with several thousand points (or vehicle
symbols) how responsive GRASS will be in terms of speed and memory
usage. Assume that we want to use mysql as the database and that the
map will be displayed on a web browser.
GRASS isn't really built for this, but is flexible enough to do it if
you really want. I hear QGIS is getting a real-time NMEA plugin, but
again it suffers the same problem of the task being well outside its
design intentsions. Better to start with something built for it like
GpsDrive or Kismet?
Hamish,
Thanks for the links. Will look at it and report back.
Regards,
-Karun
-----Original Message-----
From: Hamish [mailto:hamish_nospam@yahoo.com]
Sent: Tuesday, July 17, 2007 4:47 AM
To: Nithi, Nachi K (Karun)
Cc: grassuser@grass.itc.it
Subject: Re: [GRASS-user] Has GRASS been used to create near real-time
display of geomap?
Nithi, Nachi K (Karun) wrote:
I am wondering whether GRASS has been used to create near real-time
display of vector maps with a street map (of a state or county) as the
background map (PNG map) and several layers of symbols on top of it.
These additional layers can be, for example, movement of a fleet of
vehicles (each type of vehicle as a separate layer). If we want to
create vector maps frequently with several thousand points (or vehicle
symbols) how responsive GRASS will be in terms of speed and memory
usage. Assume that we want to use mysql as the database and that the
map will be displayed on a web browser.
GRASS isn't really built for this, but is flexible enough to do it if
you really want. I hear QGIS is getting a real-time NMEA plugin, but
again it suffers the same problem of the task being well outside its
design intentsions. Better to start with something built for it like
GpsDrive or Kismet?