Use the `raster` tag for questions about raster datasets. A "grid" is a regular partition of a spatial domain into congruent nonoverlapping pieces or a set of lines forming a grid-like pattern (aka "graticule").
10
votes
3answers
507 views
How can I generate irregular grid containing minimum n points?
Given a large (~ 1 million) sample of unevenly distributed points - is it possible to generate irregular grid (in size, but could also be irregular in shape if that is possible?) that will contain ...
5
votes
3answers
1k views
Ordnance Survey grids - download or generate?
Does anyone know a source from which to download vector UK Ordnance Survey grids at varying resolutions? Or failing that, a tool that can create an OS grid at a specified resolution? There are plenty ...
9
votes
3answers
2k views
Divide a complex shape file into a grid
I have a decently detailed shapefile with polygon/multipolygon features (the file is about 500mb). It's actually a shapefile of the entire world, with the features representing coastlines. I need to ...
2
votes
4answers
300 views
ArcInfo Grid ASCII to ESRI Shapefile conversion
I have an ArcGIS grid ascii file (Ramankutty Cropland at 5 minute resolution) that begins as follows:
ncols 4320
nrows 2160
xllcorner -180
yllcorner -90
cellsize ...
1
vote
1answer
127 views
Grid labels in ArcGIS, overlapping issues
I do have 3 grids made by Grids menu in data frame properties. I do need them to display in certain layout and also to behave accordingly to couple of rules (overlapping issues), so I can automate my ...
7
votes
2answers
274 views
Aggregating points to grid using R
I have a question with regard to spatial aggregation in R.
What I am trying to do is aggregate a point dataset to a grid.
I am unsure however how to do this as I have little experience with this sort ...
4
votes
1answer
100 views
Help with grid creation in QGIS
I have 235 raster tile 20km x 20km. I need to create a grid to overlay across them...ie the grid itself will be 20km x 20km, with the lines of the grid on the boundaries of the tiles.
I am assuming ...
3
votes
2answers
711 views
How to convert GRIB-1 to GRIB-2?
I need to get data for my database from some GRIB files (binary), I downloaded wgrib2, which can export GRIB-2 files to .csv and csv is very suitable for me, but some GRIB files are GRIB-1, so I used ...
6
votes
2answers
1k views
Create a polygon layer from point data
I'm currently using QGIS 1.8.0
I would like to create a polygon layer from a point dataset, where the size of the polygons relates to the resolution of the grid reference.
The ultimate aim would be ...
1
vote
1answer
264 views
How to convert a polygon to a grid of polygons using QGIS?
For example, the city of Rotterdam represented as a hexagonal grid.
