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Introduction
www.ridgeviewer.org is a resource site for people who are interested in hill walking in the UK
www.ridgeviewer.org providers a viewer to display the views from the top 2700 or so peak across the British Isles including England,
Scoland, Wales and Ireland
Viewer
Most of the source data for the site is sourced from Wikipedia and
would like to thank Wikipedia and the contributors for use of this data.
RidgeViewer
England Viewer
Wales Viewer
Scotland Viewer
Ireland Viewer
Locations
Background
Ridge Viewer has a viewer to display the view from all the highest peaks across the british isles - RidgeViewer
The viewer has data accumulated from around 2700 sites across the UK and Ireland.
The images are rendered from typically the highest point on the mountain.
The viewer images are based largely on the SRTM (Shuttle Radar Topography Mission) data.
LIDAR data is used for all sites within England, Wales with missing areas filled with SRTM data. The SRTM data is also augmented with the Ordinace Survey (OS) based 50m map data.
The SRTM data is easier to process and generally produces cleaner results than the OS data although the SRTM data sometimes can vary from actual maximum heights by around 20m due to an average being taken across a tile
(For instance, the SRTM tile for the summit of Snowdon is 20m below the top).
The OS data is composed of 10M contour lines so provides better accuracy on steep slopes while the SRTM data is probably more useful on less steep terrain and hence both are used in conjunction.
Spot heights where shown are from the OS data.
More details on most of the sites can be found at Wikipedia - List of mountains of the British Isles by height.
mega-what.com provides accurate vies the Whole Horizon around locations - useful comparison site
DoBIH Codes
The DoBIH uses the following codes for the various classifications of mountains and hills in the British Isles, which many of the above peaks also fall into.
| Code | Description |
|---|---|
| Ma | Marilyn |
| Hu | HuMP |
| Sim | Simm |
| 5 | Dodd |
| M | Munro |
| MT | Munro Top |
| F | Furth |
| C | Corbett |
| G | Graham |
| D | Donald |
| DT | Donald Top |
| Hew | Hewitt |
| N | Nuttall |
| Dew | Dewey |
| DDew | Donald Dewey |
| HF | Highland Five |
| 4 | Tump (400-499m) |
| 3 | Tump (GB, 300-399m) |
| 2 | Tump (GB, 200-299m) |
| 1 | Tump (GB, 100-199m) |
| 0 | Tump (GB, 0-99m) |
| W | Wainwright |
| WO | Wainwright Outlying Fell |
| B | Birkett |
| Sy | Synge |
| Fel | Fellranger |
| CoH | County Top - Historic (pre-1974) |
| CoA | County Top - Administrative (1974 to mid-1990s) |
| CoU | County Top - Current County or Unitary Authority |
| CoL | County Top - Current London Borough |
| SIB | Significant Island of Britain |
| Dil | Dillon |
| A | Arderin |
| VL | Vandeleur-Lynam |
| O | Other Lists |
| Bin | Binnion |
| Bg | Bridge |
| BL | Buxton & Lewis |
| Ca | Carn |
| CT | Corbett Top |
| GT | Graham Top |
| Mur | Murdo |
| P500 | P500 |
| P600 | P600 |
| Un | Unclassified |
More Info
The ridge viewer is highly derived from the code used by www.standingstones.org and the details of this are not repeated here.
Using the Viewer
The viewer can take several parameters including the following
name=string - this is a case insenstive search string
country=Country Code (IM GG JE IE FR BE CZ PL DE GR PT NO SE CH ES MT IT DK NL UK XX)
area=County - the area of the country
grid=None|grid - Specify whether to include a grid (1 degree intervals).
res=High|Med|Low - Specify the image resolution (120, 60 or 30 pixels per degree).
zoom=5|10|15|20|30|40|60|80|100|120|140|180 - Specify the Zoom Level.
x=0|360 - Specify the image X position in Degrees from 0 (North) to 360.
y=-1|20 - Specify the image Y position in Degrees from horizon (-1 to 20).
A type URL would be something like the following
https://www.standingstones.org/ridgeviewer.html?name=snowdon&zoom=7&x=127.1&y=0.76303
About and Copyright
Copyright David Hoyle 2026.
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