One of the more powerful attributes of eSpatial is its data filtering capability. This powerful feature is well worth exploring.
At this stage, I’ll assume you have signed up for your free eSpatial account and mapped your data.
Make sure your data table is visible. To filter particular data on an eSpatial map, click on the filtering symbol that appears on the top of every column on an eSpatial map table.
In my example below, you’ll notice that the first column refers to US states – that is, it has text as its content.
When I click the filtering icon at the bottom of the dropdown menu, I can select “Filter Results” (I think the other two options are self-explanatory).
This opens a new window beside the table: the Filter panel. Within this panel is a list of the states on my map, with all boxes ticked.
If I deselect them all, my mapped data disappears.
Benefits of filtering
Now perhaps you can see where this can get interesting. Let’s select Texas and all the states adjoining it.
Now only these states appear on the map.
You can now probably see the advantages of using filtering – the most obvious being that it enables you to focus on a particular region, without any other visual distractions.
So that’s the effect in a text-based column. But what if there are only numbers – integers – in the column?
On the Filter window, if I click the window side panel slider and scroll down, I can see this:
The blue scale allows the selection of a specific numeric value range. I can just move the arrows to filter to a particular range, or I can just double-click the numbers and type in the new range in the text boxes underneath:
The effect this has on the map is to leave just one state (only one state has between 500,000 and 1000000 Total Occupied Housing Units).
But what if I want to revert to the unfiltered map?
All I have to do is return to each drop-down menu on the columns I filtered and click remove filter:
In effect, I can turn filters on or off.