Creating a catchment from a report

Location Analyst lets you create Travel Time and Distance catchment types. Travel Time catchments are subdivided into three broad sub types:

Drivetime catchments. The shape of these catchments are based on the road network and the average road speed for a particular time-of-day, for example, in the UK, Night, Off-Peak and Peak.
Drive Distance catchments. The shape of these catchments are based on the road network. However, the road speed is fixed at 60 mph for all road types, and therefore equates to 1 mile/minute.
Walk Time catchments. The shape of these catchments are based on the road network and and the average walking speed.

Note: The option to create Walk Time catchments is subscription-dependent, and therefore may not be available to you.

Distance catchments comprise:

Distance Ring catchments. The shape of these catchments are circular and "as a crow flies" or straight-line measured distance from the specified location. Distance Ring catchments can be specified in miles or kilometres.

You can create a single Travel Time and Distance catchment for all reports involving an area. The process to do this is the same for all reports.

The following example procedure describes how you can create a 15 minute off-peak drive time based on an area of your choice for a report type from the Investigate an Area category.

To create a catchment from a report:

For What areas do you want to assess?, click New. The Create Catchment window is displayed. Click on the image below to view the window.

Note: The text What areas do you want to assess? is specific to the report wizards for the Investigate an Area category. For other categories and report types the text is worded according to the report type. However, the operation of creating the catchment is the same.

Type a postcode (or DPID), placename, postal address, or lat/long coordinates for the location into the text box. If you are using a postal address, separate each address element with a comma and try to include the town or city. If you are using lat/long coordinates ensure they are in WGS84 format and up to 6 decimal points, with the latitude first followed by the longitude and separated by a comma, e.g. 52.952557,-0.936455.
Click Find location. The location is displayed on the map as a marker icon .
If required, click and drag the marker icon to the correct location on the map.
Select required catchment type: Travel Time (for a Drivetime, Drive Distance or Walk Time) or Distance (for a Distance Ring catchment).
For a Drivetime catchment, select the required time of day: Night, Off-Peak or Peak (United Kingdom and New Zealand) or Off-Peak, Peak AM or Peak PM (Australia).
For a Drive Distance catchment, select Drive Distance from the Time-of-day drop-down list.
For a Walk Time catchment, select Walk Time from the Time-of-day drop-down list.
For a Distance Ring catchment, select the required unit: Miles or Kilometres.
In the Catchment Size(s) text box, enter one or more sizes (up to 5). If you enter more than one size, they must be separated by a comma, e.g. 5,10,15.

The maximum size for a Drivetime and Walk Time catchment is 90 minutes; the maximum size for a Drive Distance catchment is 90 miles; and the maximum size for a Distance Ring catchment is 150 km or 100 miles. Times must be is whole numbers (integers), whereas distance can either be in integers or decimals.
To add the catchment to saved geographies for future use, select Yes.
From the Folder name drop-down list, select the folder where you would like your new catchment to be saved.
Click OK. The Create Catchment window is closed.

The next time you create a report and require the same type of catchment around the selected area, in the Report wizard, under What areas do you want to assess?, click Saved, the Saved Geographies window appears. Use the drop-down list to navigate to the directory where you saved your catchment.

Note: The catchment is listed on the Manage Data page in the Saved Geographies section under the folder which you chose when you saved it, and is automatically given the appropriate type (for example, Drivetime) and with the currently selected data vintage. It is NOT logged under the Manage Data page Create Catchments - Status section.

You can also create:

a catchment by combining brick level geographies. For further details, see Combining bricks to create a catchment.
single or multiple travel time or distance catchments from the Manage Data page or the Mapping page. For more details, see Creating catchments.
a catchment which you draw by hand directly onto the map. For more details, see Drawing a catchment.
a catchment from an imported brick geography. For further details, see Importing a data file.
a catchment from an imported shape file. For further details, see Importing a shapefile.