4,165 reputation
1122
bio website barry.rowlingson.com
location Lancaster, United Kingdom
age 48
visits member for 4 years, 6 months
seen 1 hour ago

Here I am.


1d
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...
Mar
20
comment Overlaying lines and aggregating their values for overlapping segments
geojsonio is non-CRAN, yes? This: devtools::install_github("ropensci/geojsonio")
Mar
18
comment Can I use custom icon in QGIS?
how are you loading that into Qgis? My version 2.8 only loads .dxf autocad files...
Mar
13
comment Can I use custom icon in QGIS?
@YuAlex no, please make a file public on dropbox, or upload to github, or some other site. Make it as small as possible that still demonstrates the problem. That will also remove any problems with sharing possibly secret data.
Mar
12
comment Trying to convert coordinates for use in ArcGIS
A small sample from your spreadsheet for us to download would help about 1000% here.
Mar
12
comment Can I use custom icon in QGIS?
Any chance you can supply a sample AutoCAD file that exhibits this?
Mar
12
revised Can I use custom icon in QGIS?
added qgis tag
Mar
10
answered Making centeroids for vector grid
Mar
10
comment Create diagonals in polygon with QGIS or ArcGIS
For a polygon with N points there's N*(N-3)/2 possible diagonals (lines between boundary vertices that aren't edges). Those could easily be all computed in Python in QGIS (or in R). What criteria do we use to select the ones you want? Length? Not crossing the polygon?
Mar
10
comment Create diagonals in polygon with QGIS or ArcGIS
I don't quite understand what's happening with that triangular one, the green lines look more like two sides than two diagonals. If you had a perfect triangle, where would you draw the "diagonals"? The simplest algorithm I can think of is to find the four pointiest corners and join them cross-ways, but that wouldn't be happy with your triangularly-shaped polygon.
Mar
10
comment How to export a high resolution .tif of a map with QGIS Print Composer
I'm dying to know where you've found a printer that can output 5 metre x 4 metre prints at 300dpi and 32 bit colour depth. Why do you need this? You'll struggle to do anything with it. Can't you generate tiles?
Mar
10
comment Create diagonals in polygon with QGIS or ArcGIS
It looks like you first want to define corners, and there will be three or four for each shape? But do you see how that's tricky? Your northernmost shape, for example, has a rounded top that at some point is not going to be seen as a corner... But if the polygon edges are from road lines, are the corners always where two roads cross? That might make it easier if your data has that info.
Mar
10
comment Is there service for exporting georeferenced OpenStreetMap (OSM) maps in GeoTiff format?
If you save the current QGIS view as a PNG image you also get a world file, meaning a GeoTIFF is only a quick gdal_translate conversion away....
Mar
6
answered How to insert QGIS project properties “Project Title” as field or token using an expression?
Mar
1
awarded  Enlightened
Feb
28
awarded  Nice Answer
Feb
24
awarded  Enlightened
Feb
24
awarded  Nice Answer