Citation Rankings
Highly Cited Researchers
North America Highly Cited Researchers Citation Natural Sciences / Geography Rankings 2025
The Citation Rankings (Highly Cited Researchers) highlight the most cited and influential researchers across a vast range of scientific fields, covering 197 main and sub-disciplines, including the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings. This service, offered exclusively by AD Scientific Index, aims to provide a balanced perspective by excluding data from CERN and other statistical sources that disproportionately favor certain researchers, particularly in the social sciences and humanities. This unique approach addresses the advantages researchers with multi-author publications and CERN involvement hold over others. Furthermore, citation rankings help uncover rule violations and unethical practices within the research community. For more detailed citation analyses, explore the Scientists Last 6 Years Citation Index, Universities Total Citations Rankings 2025, and Universities Last 6 Years Citations Rankings 2025.
* Total Citation Counts Rankings
Ranking Based On Selection :1
Forest ecology
fire ecology
biogeography
disturbance ecology
geography
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
70,374
20,668
0.294
* Total Citation Counts Rankings
Ranking Based On Selection :2
urban meteorology
heat island
boundary layer climates
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
64,133
24,467
0.382
* Total Citation Counts Rankings
Ranking Based On Selection :3
Remote Sensing
Environment
GIS
Land cover
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
59,129
23,249
0.393
* Total Citation Counts Rankings
Ranking Based On Selection :4
geography
sustainability
land change
anthropology
archaeology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
50,145
16,666
0.332
* Total Citation Counts Rankings
Ranking Based On Selection :5
Remote Sensing
Terrestrial Carbon Cycle
Hydrology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
49,247
22,737
0.462
* Total Citation Counts Rankings
Ranking Based On Selection :6
Ecology
Landscape
Global Change
Land Use
Urban
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
48,076
23,789
0.495
* Total Citation Counts Rankings
Ranking Based On Selection :7
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
46,392
30,295
0.653
* Total Citation Counts Rankings
Ranking Based On Selection :8
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
44,185
24,695
0.559
* Total Citation Counts Rankings
Ranking Based On Selection :9
Land use and land cover change
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
43,296
15,230
0.352
* Total Citation Counts Rankings
Ranking Based On Selection :10
Geopolitics
territorial politics
international political economy
territory
Italy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
37,505
10,904
0.291
* Total Citation Counts Rankings
Ranking Based On Selection :11
Remote sensing
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
36,907
14,169
0.384
* Total Citation Counts Rankings
Ranking Based On Selection :12
Remote Sensing
fire
land use and land cover change
geography
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
36,608
19,414
0.530
* Total Citation Counts Rankings
Ranking Based On Selection :13
land use change
supply chain governance
sustainable agriculture
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
35,788
18,391
0.514
* Total Citation Counts Rankings
Ranking Based On Selection :14
physical geography
climatology
paleoclimatology
paleoecology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
35,563
10,833
0.305
* Total Citation Counts Rankings
Ranking Based On Selection :15
Global Ecology
Anthropocene
Land use change
Landscape Ecology
Sustainable Land Management
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
34,885
23,614
0.677
* Total Citation Counts Rankings
Ranking Based On Selection :16
race and ethnic groups
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
34,137
20,326
0.595
* Total Citation Counts Rankings
Ranking Based On Selection :17
geographic information science
lidar
geovisualization
spatial cognition
navigation
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
32,665
32,192
0.986
* Total Citation Counts Rankings
Ranking Based On Selection :18
physical geography
soils
ecology
biogeochemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
32,189
9,176
0.285
* Total Citation Counts Rankings
Ranking Based On Selection :19
governance
extractive industry
development geography
socio-environmental conflicts
political ecology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
32,042
10,827
0.338
* Total Citation Counts Rankings
Ranking Based On Selection :20
polar weather
polar climate
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26,948
8,708
0.323
* Total Citation Counts Rankings
Ranking Based On Selection :21
Agriculture
Soils
Climate Change
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26,719
13,021
0.487
* Total Citation Counts Rankings
Ranking Based On Selection :22
Cartography
geographic information systems
urban modeling
geocomputation
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26,309
10,315
0.392
* Total Citation Counts Rankings
Ranking Based On Selection :23
GIScience
visual analytics
cartography
spatial cognition
geovisualization
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
24,479
5,507
0.225
* Total Citation Counts Rankings
Ranking Based On Selection :24
Remote Sensing
Terrestrial Carbon Cycle
Biodiversity
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
23,668
11,395
0.481
* Total Citation Counts Rankings
Ranking Based On Selection :25
Paleoecology
Paleoclimatology
Global Climate Change
Open Data
Novel Ecosystems
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
23,312
11,051
0.474
* Total Citation Counts Rankings
Rankings
5,753
2,726
12
Ranking Based On Selection: 1
Veblen TT
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
70,374
20,668
0.294
Forest ecology
fire ecology
biogeography
disturbance ecology
geography
* Total Citation Counts Rankings
Rankings
6,698
255
30
Ranking Based On Selection: 2
Oke Tr
University of British Columbia
Vancouver, Canada
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
64,133
24,467
0.382
urban meteorology
heat island
boundary layer climates
* Total Citation Counts Rankings
Rankings
7,636
3,624
29
Ranking Based On Selection: 3
John Townshend
University of Maryland
College Park, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
59,129
23,249
0.393
Remote Sensing
Environment
GIS
Land cover
* Total Citation Counts Rankings
Rankings
9,977
4,753
39
Ranking Based On Selection: 4
Bl Turner II
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
50,145
16,666
0.332
geography
sustainability
land change
anthropology
archaeology
* Total Citation Counts Rankings
Rankings
10,256
402
62
Ranking Based On Selection: 5
Jing M Chen
University of Toronto
Toronto, Canada
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
49,247
22,737
0.462
Remote Sensing
Terrestrial Carbon Cycle
Hydrology
* Total Citation Counts Rankings
Rankings
10,636
5,061
31
Ranking Based On Selection: 6
Jiquan Chen
Michigan State University
East Lansing, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
48,076
23,789
0.495
Ecology
Landscape
Global Change
Land Use
Urban
* Total Citation Counts Rankings
Rankings
11,228
5,323
90
Ranking Based On Selection: 7
Karen C Seto
Yale University
New Haven, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
46,392
30,295
0.653
* Total Citation Counts Rankings
Rankings
12,152
5,776
41
Ranking Based On Selection: 8
Shunlin Liang
University of Maryland
College Park, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
44,185
24,695
0.559
* Total Citation Counts Rankings
Rankings
12,586
5,970
39
Ranking Based On Selection: 9
Emilio Moran
Michigan State University
East Lansing, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
43,296
15,230
0.352
* Total Citation Counts Rankings
Rankings
15,823
7,447
163
Ranking Based On Selection: 10
J Agnew
University of California Los Angeles
Los Angeles, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
37,505
10,904
0.291
Geopolitics
territorial politics
international political economy
territory
Italy
* Total Citation Counts Rankings
Rankings
16,230
7,638
58
Ranking Based On Selection: 11
Dar A Roberts
University of California Santa Barbara
Santa Barbara, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
36,907
14,169
0.384
* Total Citation Counts Rankings
Rankings
16,436
7,733
48
Ranking Based On Selection: 12
David P Roy
Michigan State University
East Lansing, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
36,608
19,414
0.530
Remote Sensing
fire
land use and land cover change
geography
* Total Citation Counts Rankings
Rankings
17,010
7,989
82
Ranking Based On Selection: 13
Holly Gibbs
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
35,788
18,391
0.514
land use change
supply chain governance
sustainable agriculture
* Total Citation Counts Rankings
Rankings
17,182
8,078
22
Ranking Based On Selection: 14
Patrick J Bartlein
University of Oregon
Eugene, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
35,563
10,833
0.305
physical geography
climatology
paleoclimatology
paleoecology
* Total Citation Counts Rankings
Rankings
17,730
8,324
4
Ranking Based On Selection: 15
Erle C Ellis
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
34,885
23,614
0.677
Global Ecology
Anthropocene
Land use change
Landscape Ecology
Sustainable Land Management
* Total Citation Counts Rankings
Rankings
18,305
8,571
1
Ranking Based On Selection: 16
James P Allen
California State University Northridge
Northridge, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
34,137
20,326
0.595
* Total Citation Counts Rankings
Rankings
19,588
9,131
18
Ranking Based On Selection: 17
Thomas J Pingel
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
32,665
32,192
0.986
geographic information science
lidar
geovisualization
spatial cognition
navigation
* Total Citation Counts Rankings
Rankings
20,072
824
70
Ranking Based On Selection: 18
Tim Moore
McGill University
Montréal, Canada
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
32,189
9,176
0.285
physical geography
soils
ecology
biogeochemistry
* Total Citation Counts Rankings
Rankings
20,225
9,393
2
Ranking Based On Selection: 19
Anthony Bebbington
Clark University
Worcester, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
32,042
10,827
0.338
governance
extractive industry
development geography
socio-environmental conflicts
political ecology
* Total Citation Counts Rankings
Rankings
26,354
12,098
69
Ranking Based On Selection: 20
David Bromwich
Ohio State University
Columbus, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26,948
8,708
0.323
* Total Citation Counts Rankings
Rankings
26,708
12,246
104
Ranking Based On Selection: 21
Roberto Cesar Izaurralde
University of Maryland
College Park, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26,719
13,021
0.487
* Total Citation Counts Rankings
Rankings
27,356
12,518
105
Ranking Based On Selection: 22
Keith C Clarke
University of California Santa Barbara
Santa Barbara, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26,309
10,315
0.392
Cartography
geographic information systems
urban modeling
geocomputation
* Total Citation Counts Rankings
Rankings
30,473
13,861
134
Ranking Based On Selection: 23
Alan M Maceachren
Pennsylvania State University
University Park, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
24,479
5,507
0.225
GIScience
visual analytics
cartography
spatial cognition
geovisualization
* Total Citation Counts Rankings
Rankings
32,006
14,491
123
Ranking Based On Selection: 24
Ralph Dubayah
University of Maryland
College Park, United States
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
23,668
11,395
0.481
Remote Sensing
Terrestrial Carbon Cycle
Biodiversity
* Total Citation Counts Rankings
Rankings
32,719
14,772
177
Ranking Based On Selection: 25
John Williams
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
23,312
11,051
0.474
Paleoecology
Paleoclimatology
Global Climate Change
Open Data
Novel Ecosystems