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bio website tompaton.com
location Melbourne, Australia
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visits member for 3 years, 8 months
seen Mar 9 '13 at 11:55

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20
awarded  Notable Question
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4
awarded  Nice Question
Nov
26
comment How to get an elevation profile for a gps track?
The tracks are mostly from running and cycling, so say between 5km and 100km. Typical gradients are less than 5-10% so I think anything with much less resolution than the SRTM dataset is just going to be too uninteresting... Aside from displaying the elevation profile, I also want to calculate elevation gained/lost, max/min altitudes etc.
Nov
26
awarded  Editor
Nov
26
revised How to get an elevation profile for a gps track?
added 19 characters in body
Nov
26
comment How to get an elevation profile for a gps track?
No, I don't need oceans, and am happy with excluding areas outside the SRTM (or similar) datasets. There are going to be large chunks of africa, china and south america that don't need to be covered, but I don't know what they are in advance, so unless getting the data on-demand is fast enough, it's better to have it all locally or just outsource all queries to a 3rd party (e.g. Google).
Nov
18
asked How to get an elevation profile for a gps track?
Mar
22
comment Nearest neighbor between a point layer and a line layer
This won't work in general. E.g. point = (1,1), line = ((0,2),(0,3),(3,0),(2,0)). If you sketch that, you can see the "closest" vertices on the line are not adjacent to the segment that passes closest to the point... I think the only way to handle this is check every segment (possibly using bounding boxes to avoid optimize it a bit). HTH.
Mar
4
awarded  Scholar
Mar
4
comment Calling LineString.closestPoint or LineString.project methods from Python?
You're right, I didn't pick up on that. Guess LineString and LineSegment were similar enough when I was scanning through for me to not notice. Thanks.
Mar
4
accepted Calling LineString.closestPoint or LineString.project methods from Python?
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3
awarded  Student
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3
asked Calling LineString.closestPoint or LineString.project methods from Python?
Mar
1
awarded  Supporter