Welcome to Methods 3, Lecture 6
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Methods 3
Heat map?
Geocoding?
Khadija
Claudia
Creating data
Georeferencing
Georeferencing with QGIS
find landmarks easily discerned in both your image and the reference map
try to just pin down the corners of the image onto the map—start with 4 points
updating attribute tables
deleting fields
sometimes you need to do something more complex
double-click to rename
refactoring always makes a new layer that you should save to a shapefile
the field calculator
the field calculator is a way to create new columns
column types
- numbers: integer, real (decimal numbers)
- text: string
- dates: with and without time
mathematical expressions
+, -, /, *
mathematical expressions
+, -, /, *
add, subtract, divide, multiply
sometimes it is useful to convert a column type
if med_income is -, make the new column NULL, else convert to an integer
