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awarded  Nice Question
Aug
26
comment How to anonymise a gps file?
@Adam yes that would be a possibility
Aug
22
comment How to anonymise a gps file?
@Simbamangu I mean by 'clipping' cutting off the beginning and end of the track. I'm not sure what K anonymity is for a sequence of points. Thanks for the clarifying questions, hope they help.
Aug
18
comment How to anonymise a gps file?
Discussion with colleagues has led to the idea of simply chopping the first and last x metres to a distance which is deemed 'k anonymous' en.wikipedia.org/wiki/K-anonymity . In answer to @drfrogsplat I mean the ICO's defintion of anonymity, which is vague: "There is no simple rule for handling spatial information – such as postcodes, GPS data or map references - under the Data Protection Act 1998 (DPA). In some circumstances this will constitute personal data" (but which?): ico.org.uk/media/1061/anonymisation-code.pdf
Aug
12
asked How to anonymise a gps file?
Jul
30
awarded  Nice Answer
Jun
22
asked Why does R(gdal) mangle data when converting to geojson?
May
13
accepted How to create an attractive choropleth map in R?
Apr
24
comment What is the most user friendly OSM route planning API?
No I mean is easy to create a client for R. By which I mean: 1) has an intuitive syntax, 2) a wide range of functionality, 3) good performance. Sorry for not being specific, I guess it's simply quite a broad question...
Apr
23
comment What is the most user friendly OSM route planning API?
@Karussell From a developer perspective. I've seen that link before but I'm asking for something different: up-to-date insight from people with recent knowledge of routing APIs about which ones are most user friendly from a user perspective.
Apr
22
asked What is the most user friendly OSM route planning API?
Mar
21
accepted Overlaying lines and aggregating their values for overlapping segments
Mar
21
comment Overlaying lines and aggregating their values for overlapping segments
Thanks for the advice. Any example code would also be very useful.
Mar
20
revised Overlaying lines and aggregating their values for overlapping segments
Fix plot command
Mar
20
revised Overlaying lines and aggregating their values for overlapping segments
added 12 characters in body
Mar
20
comment Overlaying lines and aggregating their values for overlapping segments
Yes I think that's a fair summary of the problem. Any example code? plot(gIntersection(r[1, ], r[2, ])) shows it's pulling out the joint geometry - major step forward. But still cannot see how to generalise the solution. My approach would be to build a double or triple nested for loop that starts at gIntersection(r[1, ], r[2, ]) and ends and gIntersection(r[4, ], r[5, ]) at sums at each stage until there are no more overlaps. Sound like a reasonable approach? If so I'll try it. @Spacedman
Mar
20
comment Overlaying lines and aggregating their values for overlapping segments
Yes that's right. Equally r <- readOGR("l.geojson", layer = "OGRGeoJSON") works - just playing with new packages - no idea if they're any different in terms of performance - geojson_read is shorter is only difference I see.
Mar
20
asked Overlaying lines and aggregating their values for overlapping segments
Feb
21
comment Route analysis in R based on the OSM transport network: possible?
I would say calling online route service apis from within R is the main innovation I've learned this year - one way described here: journal.r-project.org/archive/2013-1/kahle-wickham.pdf routino is also good, not used it though
Dec
14
comment Raster to polygon using R
Please provide a reproducible example of this problem, then we can understand what's going on (i.e. provide us with the .tif file you're trying to convert)