Select OS Grid References

Here the data columns are selected. Note that OS grid references only require one column, instead of the two data columns required for the other coordinate systems.

The data used for this example was originally derived from the NTF product distributed by the Ordnance Survey (UK's national mapping agency). This has been converted into a simple comma-separated text format.

Unfortunately copyright issues prohibit us from distributing this data as a tutorial example.

Interpolating to a much finer grid

The input dataset is on a 50m grid. Here we set the required grid spacing to 10m. GridImp will interpolate the data to this new grid spacing to produce a much smoother looking map. The data extents are kept the same so that all of the data is plotted.

Setting a custom color scheme

The previous tour used a pre-defined colormap. For this example we use GridImp's color editor to create a new colormap. The new colormap is based on the pre-defined "Hot Black" colormap with some shades of blue inserted at the beginning.

All data values will be plotted. This will make the valleys (low height) appear blue. The uplands will be colored gray, and the mountain tops will be colored red and orange.

Final plot

This is the resulting map in Microsoft® MapPoint®.

Note the detail that has been reproduced. Notice how the roads, rivers, and railway follow the valley bottoms (blue). Note the moutains. Snowdon (in the west) is the highest mountain in England and Wales.

This is the last page of the Guided Tour. You can Download the GridImp trial, Buy GridImp, or return to the GridImp home page.