4,360 reputation
1122
bio website barry.rowlingson.com
location Lancaster, United Kingdom
age 49
visits member for 4 years, 8 months
seen 32 mins ago

Here I am.


23h
comment Authentication Form : Multi-users access
I'm voting to close this question as off-topic because its not about GIS and you probably need another stackexchange site..
May
6
comment Creating 3D terrain/model from contour lines, preferably using Open Source GIS?
Then you've got no chance. You don't know if a line is 7m higher or 7m lower than its neighbour? How do you think you can reconstruct the elevation? Unless you have a very simple slope. Any chance of seeing this?
May
5
comment Temporal correlation of point data
Tricky, since water leaks are probably more likely where there are more pipes, and that's where there are more people, and that's where you get more diseases. So you may see a correlation purely because pipes are where all the people are. Do you have an at-risk population dataset? And a map of the pipes? Although this probably isn't as important in a purely temporal analysis if the population doesn't change much...
May
5
comment Creating 3D terrain/model from contour lines, preferably using Open Source GIS?
Never mind the 2m/7m distinction, how do you know the height of each contour line?
Apr
26
comment Writing out comma separated values inside a single cell in a spreadsheet using python
There's not a lot of GIS in this, try stackoverflow.com
Apr
26
comment How Does Ogr2Ogr Simplify Work?
What has your raster (with a "spatial", not "spectral"?) resolution of 30m got to do with the vector data? Nothing?
Apr
23
comment Best Projection for Getis Ord Gi* Statistic Analysis
The function localG in the R package spdep can do this, and gives you full freedom in the weights matrix. Doc in here: cran.r-project.org/web/packages/spdep/spdep.pdf
Apr
23
answered Best Projection for Getis Ord Gi* Statistic Analysis
Apr
17
comment How can I geocode CSV by postcode, using existing point data, in QGIS?
So I think I've nailed the method, it something in your data or your setup. Can you make the data available?
Apr
17
comment How can I geocode CSV by postcode, using existing point data, in QGIS?
Is your postcodes layer a point shapefile? Or is it a CSV you've loaded without geometry? Can you map it? Something's not right.
Apr
17
comment How can I geocode CSV by postcode, using existing point data, in QGIS?
No, you get one point for every line in your CSV, (minus the ones that don't match).
Apr
17
answered How can I geocode CSV by postcode, using existing point data, in QGIS?
Apr
17
comment How can I geocode CSV by postcode, using existing point data, in QGIS?
What do you want to do if one of your data points has a postcode that isn't in the postcode-coord lookup?
Apr
17
comment How can I geocode CSV by postcode, using existing point data, in QGIS?
Righto, I think we need some sample dummy data sets for playing with... (oh, and its easy to do in R).
Apr
17
comment How can I geocode CSV by postcode, using existing point data, in QGIS?
Where is your postcode-coordinate information stored? In a shapefile or similar with postcode as an attribute? Is that what you mean by "the postcode layer"?
Apr
5
comment Which UTM zone to use for a large country?
If you have a large area and you want distance measurements accurate to a high precision then you should stick to WGS84 Lat-Long and compute the distances via great-circles on the WGS84 ellipsoid. What are you doing with the distances once you have them?
Apr
5
answered plot 3D graph based on raster pixel values
Mar
26
comment Count roads crossing borders
What data have you got? Or do you need us to help you get that too? What software have you got?
Mar
21
answered Overlaying lines and aggregating their values for overlapping segments
Mar
20
comment Overlaying lines and aggregating their values for overlapping segments
So your output is a set of simple linear features corresponding to the sections of road in that network with an attribute that is the total for all the input simple linear features that go over it? I think rgeos::gOverlaps and gIntersection will be the key here...