Fremont Central Park
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Gnomad is now based on GTK-2.x. Notice the updated look.
This shows Central Park in Fremont with a tracklog around Lake Elizabeth. Gnomad is ideal for recording / backing-up tracklogs and waypoints from portable GPS's.
Here you see a few actual tracklog lines superimposed on a color overhead image. Notice the level of registration that is possible with a reasonable quality GPS and an external antenna.
This is another good demonstration of the registration that is possible with a good GPS. The red waypoint dot is within a meter or two of where the waypoint was actually taken.
Linux Picnic tracklog lines on a BW overhead imagery from the USGS. On the left one can see Moffet Field. In the middle one sees a red waypoint indicating where the user marked a position. On the right are some yellow tracklog lines showing where the user walked and drove around.
Most of the US is only covered by this type of black and white imagery.
Same shot as above in USGS's natural color series. Only a few Cities have data in this format. The resolution is quite good allowing zooms to 33cm.
Same shot, with a 100K topo map raster. The registration of this type of map is very good, but the line lines start to look quite blotchy at higher zooms.
Same shot as above displaying the native Gnomad vector map. Street level detail for the whole US is included with Gnomad.
Gnomad has an optional compass rose that helps one locate the center of the display and locate true and magnetic north.
Gnomad can do real-time rotations track-up, destination-up as well as arbitrary angles up.
This is the same cloverleaf seen in the above tracklogs, but at much higher zoom. It is a good demonstration of how one can zoom in on the vector map without the lines looking all jagged and background looking all blotchy. Unfortunately the registration isn't always as high as the USGS TOPO'S or overhead imagery. We do have plans to fix this, but it will take a while. Sorry!
The splines on this tracklog are an artifact of how this particular gps (a Garmin Emap) compressed the tracklog points. If the tracklog were taken by Gnomad itself operating in real-time, the curve would have been quite smooth with one data point stored each second. At 20mph that would have been one spline point every 9 meters.
This shows the same tracklog slines superimposed on 50cm per pixel color overhead imagery. Even with the splining one can clearly make out what was going on. Also notice Gnomad's built in tape-measure readout in the status-bar (at the bottom of the gonad window). Here is what it looked like after I measured the left-most diagonal spline (the one going diagonally across the intersection).
A way-out zoom of the SF Bay Area diplaying on a USGS TOPO map. Visible are a few hundred red waypoint dots and (barely visible at this size) yellow tracklog lines of various automobile trips.
A way-in zoom of the of the linux picnic tracklog diplaying on a USGS 24k TOPO map.
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wolfgang.rupprecht+web@gmail.com
(Wolfgang S. Rupprecht)
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