GIS Practice2
5
Computer practical 2 Mapping 2011 Census data Introduction In the last practical you downloaded 2001 Population Census data and created a choropleth map using this data. You d idn’t learn how to turn this into a professional map. We will work towards this in this computer practical, but first we need to download 2011 Population Census data so that we can explore the extent to which student clustering has increased. Unfortunately the procedure for 2011 Population Census data is not as straightforward as for 2001. Downloading the 2011 Output Area The Output Area boundaries for the 2011 Population Census can be downloaded from UKBorders http://edina.ac.uk/ukborders/ . Once you are logged into UKborders click on Boundary Data Selector You need to select England, Census boundaries and boundaries for 2011 and later. The click on List Areas and select Newcastle upon Tyne. When you are happy that you have done this correctly please click on When this process is finished click on Open this data and then click on saving the extracted data to your H: drive. Please make sure all the files are extracted as this process sometimes does not extract all the files. Open ArcMap and with the ArcMap Document from Practical 1. In the insert drop down menu at the top of the page open data frame. If y ou click on the layout view (a very small button near the bottom of the page) you should see that there are two maps for your sheet of A4 which will become a figure for y our assignment. You will need to resize the maps so that they bo th fit in, but this can be finalised at the end . Return to the dataview (next to the layout view) and then right click on the new data frame and select activate . You should see an d empty map. For this new data frame set the projection as you did in Practical 1 to British National Grid (right click on data frame and select properties ).
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Transcript of GIS Practice2
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Open the English Output Areas for 2011 in Arcmap.
You will probably get this warning sign. Do not worry and just close the warning.
You should see the Output Areas for Newcastle in a similar way to the map for 2001
Population Census data.
Accessing 2011 Population Census data
The 2011 Population Census data can be accessed from Infuse (http://infuse.mimas.ac.uk/).
This data is open access so there is no need to register for its use. Click on and then
.
From the many topics on offer select the following:
You will be presented with a page showing you more details on this option. Click on next.
In the same way as the 2001 data you need to check the following categories:
And then click
You should get the following:
Then click on
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Then check output areas and add them to the box. Yes we do have to download the data for
the whole of the country (we have no other choice at the moment).
Click on next and then and then
Extract all the files to somewhere on your H: drive.
Open the following file in excel:
The data comes in a format which needs to be altered to be entered into ArcMap. You need
to change the format from the following:
To something like:
Then save the file perhaps as Census.csv, keeping its format to your H: drive. Then exit
Excel without saving the data further as it will try to covert this into an Excel file.
In the New Data File part of ArcMap (which contains the 2011 Output Area boundaries), add
the census.csv data into the package. Right click on the
output area boundaries for Newcastle and
.
Select the following options and click ok:
Right click on the output area boundaries for Newcastle and
select
Save this to your drive. This process
will take some time and the computer may suggest that ArcMap is not responding – don’tworry about this it just takes time.
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Before we create your Choropleth map we need to actually calculate the percentage in the
upper occupation groups. To do this right click on the newly created Tyne and Wear Output
Area layer2 and Open the Attribute Table.
In the Table select Add Field
Call the pstudent (for the percentage of students). Navigate to the new field (pstudent) youhave just created, right click on the heading for the column and then select Field Calculator.
Click on Yes to the warning.
Enter:([census_csv_stud1]+ [census_csv_stud2])/ [census_csv_all]*100Click OK.
Right click on the and open the properties
If everything has gone well you should be able to now show the pstudent data in a Choroplethmap.
You now have a choropleth map for both 2001 and 2011 data. For a direct comparison of
these you need to have the same ranges for the categories. I suggest that you make the 2001
data comparable to the ranges that are provided for 2011. To do this open the properties for
the studcen2001 file and then Symbology file. Then click on classify. You will see blue
vertical lines. These can be dragged so that the 2001 ranges are the same as the 2011. You
are now able to compare like with like. IT IS VERY IMPORTANT THAT YOU MAKE
THIS LIKE FOR LIKE COMPARISON
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Turning this into a professional mapSee the lecture example for you to possibly use as a comparator.
The next stage is to switch to the layout view (a very small button near the bottom of the
page). You should now have two maps within the same layout view . The question is how to
present that information on a sheet of A4. I would suggest that both of the maps are of equalimportance and should be equal in size. Both maps are important, but it is the comparison between
the maps which is perhaps of most interest. When I produced the map my preference was to use thelandscape rather than portrait orientation. This can be changed by clicking file and then print and
page setup. You can set the orientation to landscape for printing and in the Map Page Size check theUse Printer Paper Setting box.
Both maps within the layout view need to of an equal size and zoom for comparison. If you can get
the map outlines to the same size you are then able to fix the zoom of one to the other. Click on one
of the map boxes, right click and select properties. In the properties menu select the following byusing the drop down menu below the Extent:
This will mean that from now on you will only be able to zoom in and out of one of the maps but the
other will have the same zoom.
You will need to add a title – I think this will be Figure 2. You also need to add a scale bar (only oneis needed if both maps are to exactly the same scale), which can be added through the insert menu.You also need to add a legend, but it might be worth waiting until you have completed the next practical. In the next practical you will provide the boundaries of the Area of Housing Mix /Direction Area. These boundaries can then be copied and pasted from your context map into Figure
2.
You will need to add an acknowledgement for the use of census and UKborders and PopulationCensus data. See your assignment sheet for the words which can be copied and pasted into theappropriate place.
