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10h
revised R: Krovak projection in R - identical in ArcGIS, different in R?
added 983 characters in body
10h
revised R: Krovak projection in R - identical in ArcGIS, different in R?
added 1869 characters in body
11h
answered R: Krovak projection in R - identical in ArcGIS, different in R?
20h
comment Measuring Volumes using DEMs
A first approximation is just the sum of the DEM values multiplied by the area of a DEM pixel, when you use the same units for each. That should be doable in the QGIS expression calculator...
2d
comment Failed to create a raster-brick from a netCDF file (.nc)
Install the netcdf develepment system (not R) packages first - sudo apt-get install libnetcdf-dev should do it.
May
3
comment Does QGIS have any plugin to work with WhatThreeWords?
Yes, see the link to code on github at the top of my answer.
May
3
comment Seeking shapefile for Pacific Ring of Fire?
Useful, but overlaying the Ring Of Fire from Wikipedia/USGS shows its not a simple buffer round plate boundaries. It follows the PA plate mostly, but then goes down the west side of South America, and on the other side of the ocean it just stretches out to cover large chunks of various other plates.
May
3
comment Seeking shapefile for Pacific Ring of Fire?
Unless you can link directly to the dataset that helps the user, this is not an answer.
Apr
30
answered Seeking shapefile for Pacific Ring of Fire?
Apr
30
comment Can I reorder the points in a GEOS LineString?
If you intersect a line from the centroid that goes out through all the buffer polygons and add those intersection points, making new polylines, would that give you a fixed point to start from?
Apr
29
comment Circles preview in QGIS for TripAdvisor API
Is one big circle not enough? Is there a maximum radius? Perhaps you should edit your question a bit for clarification...
Apr
29
comment Circles preview in QGIS for TripAdvisor API
When you say "fill the area" do you mean you want to create a set of circles that overlap and completely cover the Qgis map canvas area? And create them as a new layer in Qgis?
Apr
28
comment Circles preview in QGIS for TripAdvisor API
I'm a bit confused. Is the user drawing a circle interactively or is Qgis drawing a circle based on some circle specification?
Apr
28
comment Circles preview in QGIS for TripAdvisor API
Do you want the user to draw a circle on a Qgis map canvas so you can then call the API with the circle x,y,radius? Suggest you need to create a circular rubber band using the QgsRubberBand class. qgis.org/api/classQgsRubberBand.html
Apr
28
comment mapping with spplot
what does range(df$Z) say? Because it looks like you've got something in the region of 10^57 in there. Some kind of missing value code?
Apr
28
comment Seeking shapefile for Pacific Ring of Fire?
I don't think there's a precise definition of "the ring of fire". That pink polygon is just one person's sketch. You could make something similar in about ten minutes using Qgis. Watch out though, because it crosses the date line...
Apr
28
comment Assigning points to grid using R
What's your desired output here? A grid on the same extent and resolution as the precipitation but where each pixel is number of houses? Or do you want to augment your household survey table with row/column numbers of the corresponding grid cell?
Apr
25
comment north arrow outside map
Is your code supposed to work? Because XXX isn't defined.
Apr
25
comment Why the krige.cv gstat function does not ask for a semivariogram model for every training set?
You could improve this by adding some sample code that shows what you are doing - generate some random data points if you can't share your data.
Apr
25
revised Why the krige.cv gstat function does not ask for a semivariogram model for every training set?
I assume this is R related...