Working With Map Projections
This assignment explores how to work with mapprojections in QGIS.
Part 1: QGIS Tutorial Videos
Watch the series of short instructional videos that introduce you to the software and techniques required
to complete the following tasks:
3.1: Working with Coordinate Reference Systems in QGIS
3.2: Working with Coordinate Reference Systems in QGIS (2)
Part 2: Exploring projections with QGIS
The data for this lab is available in the a3data.: zip file.
Video 3.1 covers a few points about working with coordinate reference systems in QGIS.
Video 3.2 provides a few pointers related to on-the-fly coordinate systems.
1. Create a new QGIS project and add these shapefiles:
Order and style the layers appropriately so that you can see the effects of the map projections on the
graticule and the tissot indicatrix. Enable on-the-fly CRS transformation and change the CRS of you project
the each of the following CRSs listed in the table below. Export each map (using the Project menu | Save as
Image) and insert them into your table. For each CRS, classify them by CRS type (geographic or projected)
and by the geometric relationship(s) preserved (shape, direction, area, distance, none). You can answer this
question by creating a table like this one and filling in the missing values. A blank version of this table is
available on Learn (16 marks)
CRS name and EPSG ID
WGS 84 (EPSG:4326)
WGS 84) Pseudo Mercator
2. Reexamine the five projections you added to the table in Task 1.
a. Compare the World Mollweide (EPSG:54009) projection with the WGS 84/ Pseudo Mercator
(EPSG:3857) projection. Compare and contrast the pattern of distortion in these two
projections. How do the Tissot circles change as you move away from the standard line? (4
b. OF the five projections shown in the table from Task 1, which one would you choose for a map
showing the areas of deforestation around the globe over the past 10 years? Why would choose
that particular projection? (3 marks).
3. In addition to the five projections we explored above, a wide variety of other projections can be used for
a variety of applications. Take time to explore some others. Explain whichmap projection would be
appropriate for each of the following maps and why. (8 marks): Include a screen capture of a map
including Tissot circles.
a. Adot map of penguin populations in Antarctica
b. A map showing areas of pine beetle infestation in North America
c. A map showing state and provincial unemployment rates in North America
d. Airline routes across the northern polar region
4. Create a new QGIS project and add the hd_buildings shapefile from assignment 1. By default the
features will be added in EPSG:26917 (the coordinate reference system that the features in the shapefile
are stored in). Zoom in to a small part of one of the heritage districts. Notice that the corners of the
buildings appear to be a right-angles (as you would expect). Now enable OTF and change the CRS to
EPSG:4326. How to the buildings corners appear now? Can you explain why the buildings corners no
longer appear to be square? Now try EPSG:3857. Are the corners still square now? Include an exported
image of the buildings in each of the three CRSs with your answer. (5 marks)
These solutions may offer step-by-step problem-solving explanations or good writing examples that include modern styles of formatting and construction
of bibliographies out of text citations and references. Students may use these solutions for personal skill-building and practice.
Unethical use is strictly forbidden.