Conservation Planning Exercise

Marxan is designed to solve the minimum set problem - selecting areas to meet targets with the lowest possible cost. Below is a simple exercise to help you understand this process.

Instructions

Click on the squares below to select or deselect a square. The goal is to select squares that total to meet the target values with lowest possible cost. When you meet your targets you can compare your results against Marxan's results.

0
0
0
$347
0
0
0
$52
0
0
1
$985
0
0
0
$207
89
0
12
$276
30
48
0
$821
69
4
9
$122
0
0
0
$404
0
0
0
$300
0
0
91
$681
0
0
0
$813
0
0
0
$537
0
0
0
$931
0
0
0
$653
71
43
12
$919
99
0
1
$826
0
0
0
$455
17
0
0
$983
0
0
35
$731
31
0
0
$875
0
0
0
$247
55
40
0
$462
0
0
0
$287
0
2
27
$988
70
0
0
$85
37
0
56
$736
0
0
0
$681
0
0
33
$479
0
41
0
$459
54
0
0
$615
0
0
0
$378
80
8
0
$986
0
47
0
$887
0
0
0
$392
0
78
0
$526
0
0
87
$783
66
0
38
$224
0
0
0
$149
0
0
0
$268
0
91
0
$90
0
0
0
$977
0
0
73
$74
0
60
0
$53
25
79
0
$390
0
0
0
$619
11
0
8
$773
0
0
0
$952
0
0
0
$738
0
0
0
$897
0
0
53
$580
76
34
0
$969
0
90
0
$76
0
84
0
$147
0
0
82
$870
0
72
26
$350
0
0
0
$543
0
0
21
$607
58
0
0
$375
0
0
0
$903
0
54
59
$790
75
0
60
$729
0
0
0
$492
0
0
0
$303
0
0
0
$289
0
0
0
$490
0
0
0
$599
91
0
0
$407
0
0
57
$651
0
42
97
$709
0
0
7
$365
0
0
0
$571
0
37
0
$931
0
0
0
$353
0
0
0
$64
0
0
0
$955
0
0
0
$950
0
0
0
$855
0
23
0
$886
0
41
0
$840
81
0
37
$598
0
0
12
$422
0
0
0
$252
0
0
0
$941
0
53
24
$152
0
72
0
$353
0
93
0
$123
0
0
0
$716
0
23
59
$587
0
0
0
$346
0
0
0
$318
0
0
0
$682
11
0
0
$891
0
14
50
$815
0
0
0
$818
0
0
88
$726
0
0
0
$372
0
0
0
$197
48
0
0
$89
0
0
0
$417
0
76
0
$975
FeaturesTargetCurrentShortfall 
A267.400
B251.200
C243.000
Cost:0
Boundary:+0
Shortfall Penalty:+0
Your Marxan Score:=0

Marxan Results:

Marxan uses the formula above with Cost, Boundary and Shortfall Penalty to evaluate the affects of selecting or deselecting an area; this is called the Objective Function.

Spatial ArrangementTotal CostMarxan Score
Unclumped:show solution$17755175
Clumped:show solution$31405340

Clumped vs Unclumped

In many cases having fewer and larger areas is easier to manage. In this case it is desirable for Marxan to select areas in a clumped fashion. You can try to cluster your selection of squares while meeting targets to observe the effects of increased clumping on your boundary, costs and Marxan score.
Once you meet your targets Marxan's results will appear here.
This exercise is produced here with the permission and support of:

PacMARA Logo

University of Queensland