WorksheetsUnit - 3 Digitizers and Topology
Total questions: 10
Worksheet time: 5mins
How the raster data are made of
Images
Maps
Grid cells
None of the above
Digitizing in GIS is the process of converting geographic data either from a hardcopy or a scanned image into
Simple image
Raster data
vector data
Complex data
How many stages are followed when digitizing a paper map
3
5
7
4
Manual digitizers may be used in
Line mode
Area mode
Square mode
Either point or stream mode
Is adding attribute data in digitized data is possible?
True
False
Need Conversion
Topology means
set of rules that defines how point, line and polygon features share coincident geometry
set of rules that defines how map projection features share geometry
set of rules that defines how point, line and polygon features share adjacent matrix
set of rules that defines how data coincides
Topological concepts include
Network, Connectivity, Containment
Area definition
Adjacency, Connectivity, Containment
Contiguity
Connectivity is defined as
Edge node topology
Arc node topology
Cross node topology
Geometry
Topology defines and enforces
data redundancy
data intervention
data integrity
data reduction
Topological Consistenct rules describe
Physical relationship between features
Integral data unity
Consistency
Logical relationship between features
