Hot answers tagged research
9
That is SonarWave Lite by Tekmap. It's free and can be downloaded from the preceding link if you have some SONAR data lying around that you want to play with.
The company who makes it also appears to make heavy use of GRASS and GDAL - so you can consider SonarWave Lite to be GIS-based, but for a very specific application.
EDIT: I looked a bit more into ...
5
One issue might be the number of satellites.
Some formats - such as NMEA as described here - include a number of satellites record for each point.
With that information you could remove points where satellite coverage is poor, as being potentially unreliable. NMEA also includes a Horizontal Dilution of Precision (HDOP) value which you can also use to ...
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The question could be read in several ways. I interpret it to mean you have a large number of points and you intend to probe them repeatedly with arbitrary points, given as coordinate pairs, and wish to obtain the n nearest points to the probe, with n fixed beforehand. (In principle, if n will vary, you could set up a data structure for every possible n ...
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Some terminology first to set the context:
Load balancing is a computer networking methodology to distribute workload across multiple computers wikipedia.
Distributed computing instead refers to a network of computers who interact with each other in order to achieve a common goal wikipedia.
The difference would be that in load balancing the requests are ...
2
I use geohashes for exactly this. The reason I am is because I needed to implement proximity searches using a pyramid style information system.. where geohashes with an 8th level precision were the 'base' and formed new totals for geohashes of the 7th precision.. and so on and so forth. These totals were area, types of ground cover, etc.. It was a very ...
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Here is another option for Global Cities: GRUMP version 1 now has a free layer of settlement points with attributes, such as population size.
http://sedac.ciesin.columbia.edu/data/set/grump-v1-settlement-points
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Here's how I would go about this problem, some of my suggestions may not be practicable, but if they aren't just say so in a comment.
I agree with whuber on the stats forum, and the zig-zagging error due to the high frequency of sampling of the one device seems unlikely to me to cause that large a discrepancy in the distance (How fast were you traveling?). ...
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