|About||This application is a tool for viewing GIS layers. Production release 1.1.|
It is part of the LIVE Services project. Please direct all feedback, questions, etc here.
|Credits||OpenLayers (v5.3.0) provides most of the underlying functionality.|
OpenStreetMap, a community project, is currently the only free basemap available.
Boundary-Line™, an Ordnance Survey product, is an authoritative source for all GB administrative boundaries.
|Divisions of the page|
(from the top down)
|Bar - controls and options.|
Map - the GIS display window.
Hint - suggestions and mouse-over information.
Help - this user guide.
Info - details of the selected feature.
List - feature names alphabetically. These are also links for loading the feature geometry and zooming to that feature on the map.
|Getting started||Hide this help by clicking the blue button on the top control bar. Refer to it again by pressing the keyboard H key.|
The map window shows only a basemap to begin with.
Select a new entry from the overlay drop-down.
Wait for Mapping and Features to load (green) then scroll down and select a feature from the list.
Click on that feature (on the map) to get details.
|Zoom the map||Use the + and − buttons on the left hand side of the map window. Reset the zoom using the E (zoom to extent) button below them. Shift+click and drag to define a new bounding box.|
|Pan the map||Just click and drag. There's an 'extent' that defines the limit of panning.|
|Zoom to a feature on the map||Features must be ready (green). Click on any visible feature. Or select a feature from the list (see below).|
|Select a feature from the list||A tick against a feature means that its geometry is already loaded. Click on it to zoom to that feature on the map. Otherwise click on it to load its geometry first.|
|Isolate a feature||Zoom to the feature. Remove other layers. Switch off Mapping or adjust opacity.|
|Get feature info||The Mapping loader must be ready (green). Click on any visible feature.|
|Get a feature list||This only works for layers with named features. Simply select a new overlay. If necessary click the blue List button on the top control bar.|
|Show an OS grid||Set resolution using the OS grid drop-down. Zoom to a feature. A maximum of 100 squares will be shown. Above 100 you see a box around the feature - try a lower resolution. Use mouse-over to read the OS grid reference for a particular square.|
|Customize the page||To make the page look right for printing: resize the map window using the grab-and-drag handle at bottom right (a small circle). The info division will be resized to match. Hide unwanted divisions using the blue buttons on the control bar.|
If required use the keyboard shortcut C to hide all controls.
|Key C: hide or show all controls.|
Key E: hide or show the precise map extent (a bold red polygon).
Key F: disable or enable the Features loader.
Key H: hide or show user guide (and scroll-into-view).
Key I: hide or show feature info (and scroll-into-view).
Key L: hide or show feature list (and scroll-into-view).
Key M: disable or enable the Mapping loader.
Key W: shrink the map window to the map extent (this is the initial state).
|Find geometry errors||Each feature may show one error. The approximate location is marked by a small black square. At low resolution you can click on it to get details. As you zoom in the actual digitization problem becomes more apparent.|
|What's the difference between Mapping & Features?||Think raster vs vector. Mapping uses shading to depict sites whereas Features uses outlines. Use Mapping to get a rough idea of where sites are; use Features to get the precise boundary for a particular site. You may want to switch Mapping off to avoid clutter; you may want to switch Features off to save time. Toggle either using the control bar buttons, or use keyboard shortcuts (M and F respectively).|
|Minimize waits (1)||Map rendering time is currently limited to 60 seconds, and there is a limit of 1000 features per layer. Layers containing extensive detail can take several seconds or even minutes to load fully. Unless you actually need to view large areas avoid selecting an overlay until zoomed in to your area of interest. The bounding box is important.|
|Minimize waits (2)||You can initiate loading of one layer and immediately switch to another layer - the first layer will not stop loading. You can begin to use either layer's Mapping, or Features list, straight away. Expect a slight hesitation when loading finally completes and the displays are updated.|
|If you've used OpenLayers before||Some facilities are now unavailable or unsuitable. Zooming by double-click is disabled, as is mouse-wheel zoom. We don't allow attributions to be hidden. OpenLayers no longer comes with an on-map layer switcher.|