GIS application & spatial analysis：練習問題

Original chapter practice: 40 marks. Suggested time: 60 minutes (Thinka practice estimate, not an official exam duration). Answer all 10 questions. All sites and numerical datasets are synthetic teaching examples. This is not a full official HKDSE paper. Use a calculator, ruler and pencil; show units and working.

Which is an attribute of a mapped park rather than its geometry?

Which representation is usually suitable for continuous elevation across a study area?

A home is inside a 500 m straight-line buffer of a park entrance. What follows?

To select land meeting both area ≥ 2 ha and slope ≤ 5°, use:

An old 100 m raster is resampled to 10 m cells. Which statement is correct?

A planner needs candidate park land, roads and residential demand. (a) Name a suitable vector geometry for each of these three layers. [3] (b) State two metadata checks needed before overlay. [2]

Synthetic candidates: A area 3 ha, slope 3°, entrance distance 400 m, flood exposure yes; B 2 ha, 4°, 450 m, no; C 4 ha, 7°, 300 m, no; D 2 ha, 2°, 650 m, no. Criteria: area ≥ 2 ha AND slope ≤ 5° AND distance ≤ 500 m AND no mapped flood exposure. (a) Select the eligible site and give the exclusion reason for each other site. [4] (b) State one limit of calling the result “safe”. [1]

Figure N is a synthetic connected walking network. Edges A–B = 300 m, B–C = 400 m and A–C = 900 m; all are two-way. (a) Find the shortest A-to-C route and length. [2] (b) If B–C closes, find the remaining route and its percentage increase in length. [2] (c) State one reason why the shortest route may not be accessible to everyone. [1]

Use Figure O, a synthetic local metre-coordinate plan. A proposed park entrance P is (0,0); homes H1=(300,400), H2=(600,0), H3=(0,400). A straight-line buffer radius is 500 m. (a) Calculate distances and select homes inside or on the buffer. [4] (b) Explain the layers and overlay operation needed to count residents served rather than only homes. [3] (c) Explain a limit of this result and a field/network check. [3]

Two synthetic eligible sites are scored from 1 to 5, higher being better. P: access 4, cooling need 2. Q: access 2, cooling need 5. (a) With access weight 0.6 and cooling-need weight 0.4, calculate both weighted scores and compare. [3] (b) Recalculate with weights 0.4 and 0.6 respectively; interpret the change. [3] (c) Explain two further checks before recommending a site, each linked to a possible error or trade-off. [4]