Data source

On top of my own geological data collection which I have collected for past ~35 years from lesser Himalayan and sub-Himalayan region of Nepal, Government of Nepal published geological and topographical maps were also used for this database: Those include 1: 250.000 scale regional geological maps of Nepal compiled by Shrestha  et al., (1987) and published by Department of Mines and geology Lainchaur Kathmandu Nepal, 1:1000000 scale Geological map of Nepal by Amattya et al., (1994), 1:1000000 Geological map of Nepal published by Himalayan map house (2006), 1: 250,000 scale Geological map of Central Nepal by Stocklin et al., (1980) and 1: 2,000,000 scale Geological map of Himalayas by Fuchs (1980). Apart of those maps developed by Government geological survey department and national/international agencies other geological maps developed by students for their Ph.D. thesis were also used for this database those include, 1: 500,000 scale Geological map of Eastern Nepal by Schilling (1990) and 1:300,000 scale Geological map of Far west Nepal by Robinson et al., (2006). For geological data collection I have covered nearly 75% ground in lesser Himalayan and sub-Himalayan region of Nepal.


Topographical maps used for this study were published in 1996 by Nepal Government topographical survey department, Min Bhawan, Kathmandu Nepal in co-operation with the government of Finland. These maps were compiled from 1:50,000 scale aerial photographs taken in 1992 and they are available in two different scale and size.  For Terai and Middle Himalayan region 7.5 minute quadrangle maps are available in 1:25,000 scale and for higher Himalayan range 15 minute quadrangle maps are available in 1:50,000 scale as shown in following index map. The above maps were purchased from Government of Nepal Survey department and Department of Mines and geology in different dates for the period of five years and total value was around 3500 dollars which was paid by personal funding (Tank Ojha Ph.D. thesis).

Text Box: For detailed information please contact
Dr. Tank Ojha
Text Box: Weird Spatial Relationships among People, Climate, Topography, and Geology in the Himalayan Region of Nepal

Tank Ojha, Ph. D. , Adjunct Professor
Department of Geoscience, University of Arizona, USA 
Consulting Geologist & Geo-disaster Risk Analyst, Geo-Information Specialist for Natural Resource Management  (Email:,