QGIS TEST QUESTIONS WITH
CORRECT ANSWERS
3.5 What is raster Data?
values defined by size of cell and location to represent the nature of whatever is
present at the corresponding location on the ground
what is spatial data
data that is attached to a location
- stored in a shapefile
3.2 What are the advantages of normalising project data?
All datasets will be in the same CRS and have the same study area boundary.
in terms of raster datasets, what defines resolution?
grid size
what is temporal data?
time based data
which type of data set requires less storage?
vector data
which type of data contained more complex data structures?
vector data
3.4 what sort of descriptions can metadata give about the data
source of data, how it was created, scale data was created at, what the spatial
reference is, what kind of accuracy to expect
, What is attribute data?
specifies characteristics at a location (e.g. bedrock lithology)
- stored in a data base table
What are the two conceptual models of spatial data?
- objects
- fields
What is the difference between an object and a field?
Object: Entities with distinct boundaries (e.g. geological units, forested areas)
(point, line, polygon) suits vector data.
Field: continuous phenomena (e.g. elevation, temperature, rainfall) (grid of cells
organised into rows and columns) suits raster data.
Raster vs Vector data?
Raster: grid or cellular based data structure (uses unique reference coordinate in
corner or middle of a cell).
Vector: x-y coordinate reference-based (vector) data
Which type of data consumes the most computer storage?
Raster
What type of data requires less processing?
Raster less processing compared to vector
What is remote sensing?
process of detecting and monitoring the physical characteristics of an area by
measuring its reflected and emitted radiation at a distance
What is remote sensing based from?
Measurements of different wavelengths of electromagnetic energy (EM) (emits
a particular wavelength of EM energy based on temp of soils, water, vegetation)
What are bands in terms of electromagnetic spectrum?
bands are a set of data file values for a specific portion of electromagnetic
spectrum of reflected or emitted light
CORRECT ANSWERS
3.5 What is raster Data?
values defined by size of cell and location to represent the nature of whatever is
present at the corresponding location on the ground
what is spatial data
data that is attached to a location
- stored in a shapefile
3.2 What are the advantages of normalising project data?
All datasets will be in the same CRS and have the same study area boundary.
in terms of raster datasets, what defines resolution?
grid size
what is temporal data?
time based data
which type of data set requires less storage?
vector data
which type of data contained more complex data structures?
vector data
3.4 what sort of descriptions can metadata give about the data
source of data, how it was created, scale data was created at, what the spatial
reference is, what kind of accuracy to expect
, What is attribute data?
specifies characteristics at a location (e.g. bedrock lithology)
- stored in a data base table
What are the two conceptual models of spatial data?
- objects
- fields
What is the difference between an object and a field?
Object: Entities with distinct boundaries (e.g. geological units, forested areas)
(point, line, polygon) suits vector data.
Field: continuous phenomena (e.g. elevation, temperature, rainfall) (grid of cells
organised into rows and columns) suits raster data.
Raster vs Vector data?
Raster: grid or cellular based data structure (uses unique reference coordinate in
corner or middle of a cell).
Vector: x-y coordinate reference-based (vector) data
Which type of data consumes the most computer storage?
Raster
What type of data requires less processing?
Raster less processing compared to vector
What is remote sensing?
process of detecting and monitoring the physical characteristics of an area by
measuring its reflected and emitted radiation at a distance
What is remote sensing based from?
Measurements of different wavelengths of electromagnetic energy (EM) (emits
a particular wavelength of EM energy based on temp of soils, water, vegetation)
What are bands in terms of electromagnetic spectrum?
bands are a set of data file values for a specific portion of electromagnetic
spectrum of reflected or emitted light
