Airborne lidar and terrestrial laser scanner for mapping forest ......Choropleth 93 7 0 93 7 0 74 13...
Transcript of Airborne lidar and terrestrial laser scanner for mapping forest ......Choropleth 93 7 0 93 7 0 74 13...
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LEGEND-LESS MAPSMD. MARUFUR RAHMANS6027466
Assessment Board:Dr. R. Zurita Milla (Chair)Prof. Dr. Menno-Jan KraakProf. Dr. Georg Gartner
27th September 2017
Supervisor:Prof. Dr. Menno-Jan KraakProf. Dr. Georg Gartner
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INTRODUCTION
227-Sep-17
Motivation of the research ?
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SIGNIFICANCE
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OBJECTIVES
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Objective
To design and evaluate legend-less maps.
Sub-objectives1. Examine the role of legend in map reading.
2. Find out if legend can be omitted or replaced, if so, for which map types.
3. Compare the usability of maps with and without a legend.
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Q1.1 How does the map reading process work?Q1.2 What is the function of map legend?
Q2.1 How can the map reading process go without a legend?Q2.2 How can title and/or content replace a legend?Q2.3 Are these options valid for all types of map?
Q3.1 How to verify map reading process?Q3.2 How do legend-less map alternative performed compare to maps with legend?Q3.3 How to evaluate the legend-less map?
RESEARCH QUESTIONS
527-Sep-17
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METHODOLOGY
Objective 1:
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Objective 2:
METHODOLOGY
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Dots Dashes PatchesSize 4 4 5(Grey) Value 3 4 5Texture 2 4 5Colour Hue 7 7 8Orientation 4 2 -Shape - - -
(Kraak & Ormeling, 2010)
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METHODOLOGY
827-Sep-17
Objective 3:
Eye trackingQuestionnaire Thinking aloud
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DATA SOURCES AND USED SOFTWARE
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27-Sep-17
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Map legend ?
What is the function of a legend?
LEGEND
1027-Sep-17
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LEGEND-LESS MAPS
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LEGEND-LESS MAPS
1227-Sep-17
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Test Person (TP) Required time for the test
(Minutes: Seconds)
Effectiveness (%)Not Answered Incorrec
tCorrect
Test
1`
TP 1 19:54 2 7 91TP 4 21:40 5 0 95TP 7 20:35 0 0 100TP 10 20:22 0 0 100TP 13 36:42 2 0 98
Test
2
TP 2 18:47 0 7 93TP 5 21:40 0 0 100TP 8 12:02 7 8 85TP 11 19:05 2 2 96TP 15 21:24 0 5 95
Test
3
TP 3 20:55 0 0 100TP 6 22:48 2 11 87TP 9 22:39 0 0 100TP 12 27:54 2 20 78TP 16 16:24 0 2 98
USABILITY TEST
1327-Sep-17
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USABILITY TEST: STIMULI
1427-Sep-17
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TP 12 Map with Legend Annotated mapMap with legend in
Title
Task levelEffectivenes
sEfficiency (s)
Effectiveness
Efficiency (s)Effectivenes
sEfficiency (s)
Chor
ochr
omati
c Elementary I 70 I 17 C 4Intermediate C 10 I 18 C 13
Overall C 36 I 31 C 31
Chor
oplet
h
Elementary C 11 C 12 I 16Intermediate C 32 C 10 C 31
Overall C 50 C 25 C 17
Isople
th
Elementary C 9 C 10 C 15Intermediate C 13 C 21 C 7
Overall C 21 N - I 33
Grad
uate
d Sy
mbol
Elementary I 48 C 19 C 27Intermediate C 7 I 12 C 29
Overall I 56 C 26 C 24Effectiveness: C= Correct, I = Incorrect, N= Not answered; Efficiency in seconds (S)
USABILITY TEST: DATA ANALYSIS
1527-Sep-17
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TEST PERSONS’ VIEWS ON MAP READING, MAP LEGEND AND TITLE
1627-Sep-17
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MAP READING PROCESS
1727-Sep-17
33% 20%
17% 9%
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MAP READING PROCESS
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MAP READING PROCESS
1927-Sep-17
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EFFECTIVENESS
2027-Sep-17
Isopleth
Chorochromatic Choropleth
Graduated symbol
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Elementary level task Effectiveness (%)
With legend Annotated Legend in title
Map types C I N C I N C I N
Chorochromatic 93 7 0 80 20 0 93 7 0
Choropleth 93 7 0 93 7 0 74 13 13
Isopleth 100 0 0 100 0 0 87 13 0
Graduated symbol 87 13 0 87 13 0 86 7 7
C = Correct, I = Incorrect, N = Not answered
EFFECTIVENESS
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EFFICIENCY
2227-Sep-17
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“It could have a legend! it is very hard”
“This is a kind of annoying! I have to look for one with same colour”.
“I would love if there is a legend with size……….”
“Oh! This is interesting! I thought there will be a legend at the bottom but it is in title”.
“This is interesting!”; “This is also good idea!”.
SATISFACTION
2327-Sep-17
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No pattern matched with Bertin’ proposed map reading process (1983).
In terms of effectiveness, annotated maps perform better (choropleth, isopleth, and graduated symbol) compare to “title version”.
In terms of efficiency, “title version” perform better than annotated maps for above three cases.
Overall and intermediate level of reading can be performed without legend in above three cases. In chorochromatic, some form of legend is always necessary to perform any level of map reading.
Chorochromatic maps is the best option for designing without legend and choropleth is the least suitable option.
FINDINGS
2427-Sep-17
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Map reading process can be tested further.
Further test/research for legend-less maps can be done changing number of classes/categories.
FUTURE RESEARCH
2527-Sep-17
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THANK YOU
Maybe he’s caught in the legendMaybe he’s caught in the moodMaybe these maps and legendsHave been misunderstood
*R.E.M., ‘‘Maps and Legends’’