WEBVTT 00:00:00.500 --> 00:00:03.985 Welcome to GCSE A Q A Geography revision. 00:00:04.135 --> 00:00:06.503 Topic G 20: Fieldwork. 00:00:06.653 --> 00:00:11.506 Use your school’s selected case studies if they differ from these revision examples. 00:00:14.167 --> 00:00:19.946 Geographical fieldwork investigates a question using evidence collected in the environment. 00:00:20.096 --> 00:00:25.910 The full enquiry connects a question, methods, data, analysis, conclusion and evaluation. 00:00:26.060 --> 00:00:28.449 The geographical enquiry sequence. 00:00:28.599 --> 00:00:31.373 Each stage should address the original question. 00:00:31.523 --> 00:00:35.887 Pilot work or evaluation may lead you to revise earlier decisions. 00:00:40.567 --> 00:00:46.453 The course requires two enquiries in contrasting environments involving physical and human geography. 00:00:46.603 --> 00:00:53.567 Each uses primary data collected outside the classroom and school grounds on at least two fieldwork occasions overall. 00:00:56.233 --> 00:01:00.866 At least one enquiry considers the interaction of physical and human geography. 00:01:01.016 --> 00:01:07.927 Your own enquiry titles, locations and methods come from your school; do not replace them with invented results. 00:01:10.600 --> 00:01:15.261 Questions can assess your own enquiries or an unfamiliar investigation. 00:01:15.411 --> 00:01:21.400 For your work, revise actual evidence; for unfamiliar work, judge the methods and data supplied. 00:01:24.067 --> 00:01:33.698 Keep an enquiry summary with its exact title, location, geographical idea, data collected, sampling, presentation, conclusion and limitations. 00:01:33.848 --> 00:01:38.157 These notes support that summary but do not supply your personal findings. 00:01:40.833 --> 00:01:46.657 A good enquiry question is focused, geographical and answerable using obtainable evidence. 00:01:46.807 --> 00:01:52.449 Specify the variable, place or relationship rather than asking whether an area is simply good. 00:01:55.100 --> 00:02:01.061 A hypothesis is a testable prediction, such as an expected relationship between two variables. 00:02:01.211 --> 00:02:05.935 It should be supported by a geographical reason and may be rejected by the results. 00:02:08.600 --> 00:02:12.523 Identify independent and dependent variables where relevant. 00:02:12.673 --> 00:02:19.615 For example, distance downstream may be compared with channel width, while geology or tributaries can affect the relationship. 00:02:22.267 --> 00:02:26.514 Choose sites that address the question and can be accessed safely and legally. 00:02:26.664 --> 00:02:31.613 A convenient site is not automatically representative of the whole study area. 00:02:34.267 --> 00:02:40.335 Primary data are collected directly for the enquiry, such as measurements or questionnaire responses. 00:02:40.485 --> 00:02:45.571 Secondary data already exist, such as maps, census tables or weather records. 00:02:48.233 --> 00:02:51.653 Quantitative data are numerical measurements or counts. 00:02:51.803 --> 00:02:58.627 Qualitative data describe qualities or experiences, such as interview answers and annotated photographs. 00:03:01.300 --> 00:03:03.583 A pilot survey is a small trial. 00:03:03.733 --> 00:03:11.379 It can reveal confusing questions, unsuitable scales, equipment problems or unrealistic timings before the full collection. 00:03:14.033 --> 00:03:17.390 Risk combines the likelihood of harm with its seriousness. 00:03:17.540 --> 00:03:24.567 Identify hazards such as traffic, slippery banks, waves, heat or contact with polluted water and plan controls. 00:03:27.233 --> 00:03:31.259 Follow the school's risk assessment, supervision and site instructions. 00:03:31.409 --> 00:03:37.657 Do not enter moving water, work beneath unstable cliffs or cross unsafe roads to obtain a measurement. 00:03:40.333 --> 00:03:47.873 Controls include approved safe sites, weather and tide checks, suitable equipment, group working and clear emergency procedures. 00:03:48.023 --> 00:03:51.178 Stop or adapt when conditions become unsafe. 00:03:53.833 --> 00:03:56.543 Questionnaires should be voluntary and respectful. 00:03:56.693 --> 00:04:03.827 Explain the purpose, avoid unnecessary personal information and record data without identifying individuals. 00:04:06.500 --> 00:04:11.157 Gain permission where required and minimise disturbance to habitats and residents. 00:04:11.307 --> 00:04:15.413 A photograph of an identifiable person may require consent. 00:04:18.067 --> 00:04:23.261 Random sampling gives eligible units a chance of selection using a random method. 00:04:23.411 --> 00:04:28.498 It can reduce selection bias but may cluster sites and leave gaps in a small sample. 00:04:28.648 --> 00:04:30.547 Three sampling approaches. 00:04:30.697 --> 00:04:32.915 Random locations can cluster. 00:04:33.065 --> 00:04:35.934 Systematic locations use equal intervals. 00:04:36.084 --> 00:04:42.355 Stratified locations sample defined groups; the illustrated numbers are not a required allocation. 00:04:47.033 --> 00:04:52.686 Systematic sampling takes observations at regular intervals, such as every twenty metres. 00:04:52.836 --> 00:04:57.083 It is easy to repeat but can miss patterns that repeat at the same interval. 00:04:59.733 --> 00:05:04.790 Stratified sampling divides the population into relevant groups and samples each. 00:05:04.940 --> 00:05:10.870 It can improve representation, but relies on accurate group information and appropriate proportions. 00:05:13.533 --> 00:05:16.348 Sample size is the number of observations. 00:05:16.498 --> 00:05:22.927 Larger samples can improve representation, but repeating the same biased method does not remove bias. 00:05:25.600 --> 00:05:31.074 Record time, location, units, method, conditions and equipment alongside readings. 00:05:31.224 --> 00:05:36.299 A prepared sheet with clear headings reduces omissions and makes comparisons easier. 00:05:38.967 --> 00:05:41.579 Keep the method consistent between sites. 00:05:41.729 --> 00:05:46.975 Use the same definitions, timing and equipment, and note any unavoidable changes. 00:05:49.633 --> 00:05:52.129 Accuracy is closeness to the true value. 00:05:52.279 --> 00:06:00.320 Reliability is consistency when a method is repeated; repeated readings can be consistently wrong if equipment is miscalibrated. 00:06:03.000 --> 00:06:06.667 Resolution is the smallest change an instrument can distinguish. 00:06:06.817 --> 00:06:11.339 Recording extra decimal places does not improve the instrument's resolution. 00:06:14.000 --> 00:06:22.574 Channel width can be measured across an approved safe section with a tape; depth can be measured at stated intervals only under approved supervised conditions. 00:06:22.724 --> 00:06:25.657 Record units and the actual cross-section shape. 00:06:28.333 --> 00:06:33.581 A float gives an estimate of surface velocity: distance divided by travel time. 00:06:33.731 --> 00:06:38.477 Repeat timings; it does not directly measure the mean velocity throughout the channel. 00:06:41.133 --> 00:06:45.497 Discharge is cross-sectional area multiplied by mean velocity. 00:06:45.647 --> 00:06:55.086 A rough width multiplied by average-depth estimate simplifies an irregular channel, and a surface float adds uncertainty; explain these limitations. 00:06:57.767 --> 00:07:02.647 Pebble sampling can measure size or roundness at approved accessible locations. 00:07:02.797 --> 00:07:07.415 Select by a consistent rule rather than choosing only conspicuous stones. 00:07:10.067 --> 00:07:14.211 A beach profile uses distance and slope measurements along a transect. 00:07:14.361 --> 00:07:20.675 Keep the starting point, direction and method consistent and work within approved tide and safety limits. 00:07:23.333 --> 00:07:27.945 Infiltration comparisons require consistent soil conditions and method. 00:07:28.095 --> 00:07:35.474 Recent rain, compaction and vegetation may affect results, so note them instead of attributing every difference to one factor. 00:07:38.133 --> 00:07:42.125 These are method examples, not claims about your class's activities. 00:07:42.275 --> 00:07:47.885 Use the exact procedures, safety decisions and measurements recorded during your own enquiries. 00:07:50.567 --> 00:07:55.591 A pedestrian count records people crossing a defined point during a fixed period. 00:07:55.741 --> 00:08:00.179 Repeat at different times; one short count may not represent a typical day. 00:08:02.833 --> 00:08:06.436 A land-use survey classifies buildings using a stated key. 00:08:06.586 --> 00:08:11.865 Apply the same categories throughout and record uncertain or mixed uses consistently. 00:08:14.533 --> 00:08:18.943 An environmental quality survey scores features such as litter or noise. 00:08:19.093 --> 00:08:24.863 Clearly defined scoring criteria and comparisons between observers reduce subjectivity. 00:08:27.533 --> 00:08:30.839 Questionnaires gather opinions or reported behaviour. 00:08:30.989 --> 00:08:38.027 Neutral wording, suitable sampling and multiple collection times help reduce leading questions and selection bias. 00:08:40.700 --> 00:08:44.915 An interview provides detailed explanations but covers fewer people. 00:08:45.065 --> 00:08:49.690 Responses can reflect memory, personal interests or the interviewer's influence. 00:08:52.367 --> 00:08:56.009 Photographs and field sketches document visible evidence. 00:08:56.159 --> 00:09:02.749 Label location, direction and date and avoid treating a selected image as proof of conditions everywhere. 00:09:05.400 --> 00:09:11.115 Check data for missing values and recording errors without silently changing genuine results. 00:09:11.265 --> 00:09:14.948 Keep an audit of corrections and explain any excluded reading. 00:09:17.600 --> 00:09:28.019 Choose presentation to match the enquiry: a line graph for change with distance, bars for categories, maps for spatial patterns or a scattergraph for two numerical variables. 00:09:30.700 --> 00:09:34.533 Use a title, labelled axes, units, suitable scale and key. 00:09:34.683 --> 00:09:39.483 A graph that stretches or truncates an axis can exaggerate a small difference. 00:09:42.133 --> 00:09:46.217 Calculate suitable summaries, such as mean or median and range. 00:09:46.367 --> 00:09:51.380 Compare spread as well as averages; one unusual reading can strongly affect the mean. 00:09:54.033 --> 00:09:59.205 Describe the overall pattern using specific values, then identify anomalies. 00:09:59.355 --> 00:10:04.399 An anomaly is a result that differs from the pattern, not automatically an error to delete. 00:10:07.067 --> 00:10:10.615 Explain patterns using geography and site observations. 00:10:10.765 --> 00:10:15.556 A relationship between two variables does not prove that one alone caused the other. 00:10:18.233 --> 00:10:22.024 Compare primary findings with relevant secondary evidence. 00:10:22.174 --> 00:10:26.684 Differences in year, season, boundary or method may explain disagreement. 00:10:29.367 --> 00:10:35.018 A conclusion answers the original question or assesses the hypothesis using findings. 00:10:35.168 --> 00:10:39.300 State the strength of support rather than claiming proof from a small sample. 00:10:41.967 --> 00:10:51.138 Separate a method limitation from its consequence: one weekday survey may miss weekend visitors, making the conclusion less representative of overall use. 00:10:53.800 --> 00:11:00.753 Suggest a specific improvement matched to the limitation, such as repeating counts at defined weekday and weekend times. 00:11:00.903 --> 00:11:03.399 Explain why it would improve confidence. 00:11:06.067 --> 00:11:11.985 Consider sample coverage, equipment, observer judgement, conditions and secondary-data quality. 00:11:12.135 --> 00:11:15.378 Explain which limitations most affect the conclusion. 00:11:18.033 --> 00:11:21.233 Further data should resolve a particular uncertainty. 00:11:21.383 --> 00:11:25.351 More data of the same unsuitable kind may add little value. 00:11:28.033 --> 00:11:32.475 Evaluation is a judgement about how well the enquiry answered its question. 00:11:32.625 --> 00:11:39.163 Acknowledging limitations can support a careful, useful conclusion rather than make the enquiry worthless. 00:11:41.833 --> 00:11:43.635 That completes Fieldwork. 00:11:43.785 --> 00:11:47.131 Revisit the notes and test yourself on the revision website.