GIS

Question 1

What is the difference between Raster Data & Vector Data?

Answer 1

Raster Data -
Geographic data represented as a matrix of cells, each with an attribute.
e.g. Pixels on an Ariel photo
Not scalable

Vector Data -
Geographic data symbolised as points, lines, or polygons.
e.g. Fence lines, ownership titles
Scalable

Question 2

What are the Land Registry compliance standards for plans?

Answer 2

Plans require:
- Appropriate scale (1:1250, 1:2500)
- Orientation (North Arrow)
- Sufficient OS mapping background
- Identifying location features (e.g. road name)
- Scale Bar
- Whole property
- accesses
- Property clearly defined by edging, colouring or hatching

Question 3

If your measurements were challenged, what could you do?

Answer 3

• Meet with the client to understand concerns and explain methodology
• Offer to remeasure with them
• Ask if they had a preferred alternative method

Question 4

What makes reliable data?

Answer 4

• Reliable, reputable source
• able to cross-check
• up-to-date
• Peer reviewed

Question 5

What does GIS stand for?

Answer 5

Geographic Information System