Fieldwork and skills, Year 8: more practice：全部卡片
整套按顺序列出——孩子看到之前，您可以先通读一遍。
- On a choropleth map shaded in one colour, what does a darker shade normally show?
A higher value
提示The key links each shade to a range of values.
为什么Choropleth maps use a graded colour scheme, usually light for low values and dark for high ones, so the pattern is visible at a glance.
- A choropleth map shades each region by its total population, and a huge, almost empty region looks darkest. What should be shaded instead to avoid this trap?
Population density (people per square kilometre)
提示Totals depend on how big the region is.
为什么Density divides the number of people by the area, so large and small regions can be compared fairly. Choropleth maps work best with rates, ratios or densities.
- A choropleth map gives one shade to a whole region. What detail does this hide?
Variation within the region
提示Each area gets a single colour.
为什么A region shaded dark may contain both very high and very low places. The map shows the average, not the differences inside.
- A choropleth key has 4 equal-width classes covering values from 0 to 100. What is the width of each class? (number only)
25
提示Share the full range equally between the classes.
为什么100 ÷ 4 = 25, so the classes are 0 to 25, 25 to 50, 50 to 75 and 75 to 100.
- Why do choropleth maps usually use one colour that goes from light to dark, rather than a mix of unrelated colours?
The order of the shades makes higher and lower values easy to read
提示Think about reading the map without checking the key every time.
为什么A single-colour range has a natural order. Mixed colours have no obvious order, so the reader must keep looking back at the key.
- A GIS has a flood-risk layer and a population layer. What question can overlaying them answer?
How many people live in areas at risk of flooding
提示Think about what two sets of information show together.
为什么Overlaying means viewing layers on top of each other. Patterns that are hidden in one layer on its own appear where layers meet.
- What does GIS stand for?
Geographic Information System
提示The last word is about how the data are organised.
为什么A GIS stores, layers and analyses location data on a computer, such as roads, rivers, schools and flood zones.
- What is one advantage of a GIS over a paper map when new data arrive?
A layer can be updated without redrawing the whole map
提示Think about how a paper map gets out of date.
为什么The roads layer can be replaced with a newer version while the rivers layer stays the same, and layers can be switched on or off.
- A GIS layer shows lakes as shaded shapes with edges. Is this vector or raster data?
Vector
提示A raster layer is a grid of pixels.
为什么Points, lines and polygons are all vector data. A lake drawn as a polygon is vector; a satellite photo is raster.
- A council overlays a layer showing homes on a layer showing existing libraries to site a new library. Which area is the best choice: A many homes close to a library, B many homes far from any library, or C few homes far from any library?
B: many homes far from any library
提示Combine the two layers rather than reading each alone.
为什么Overlaying the layers shows crowded areas that are far from any library. This is how a 'where should it go?' question is answered.
1★ KS3-GEOG-FIE-0032
2★ KS3-GEOG-FIE-0033
3★ KS3-GEOG-FIE-0034
4★ KS3-GEOG-FIE-0035
5★ KS3-GEOG-FIE-0036
6★ KS3-GEOG-FIE-0037
7★ KS3-GEOG-FIE-0038
8★ KS3-GEOG-FIE-0039
9★ KS3-GEOG-FIE-0040
10★ KS3-GEOG-FIE-0041