Dr. Dennis Ojima Profile

Dr. Dennis Ojima

Senior Research Scientist at Colorado State Univ

SPIE Involvement:

Author

Proceedings Article | 14 July 2003 Paper

Land cover analysis along semi-arid transects in Asia

Dennis Ojima, Zhiqiang Gao, Jiyuan Liu, Mary Kneeland, Togtohyn Chuluun

Proceedings Volume 4890, (2003) https://doi.org/10.1117/12.465913

KEYWORDS: Climatology, Ecosystems, Agriculture, Biological research, Remote sensing, Soil science, Climate change, Carbon, Environmental sensing, Natural disasters

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Current estimates of land cover and land use are important aspects in understanding the flux of material and energy from terrestrial ecosystems into hydrological and atmospheric components of the earth system. These land use characteristics define the various dimensions of human impacts on ecosystem processes and resource use. The recent availability of global remote sensing data and agricultural census data from various regions of the world, including portions of Asia such as China and Mongolia, now makes it feasible to evaluate differences in the physical environment and land use patterns affecting land cover and land use changes. In addition, recent research involving transects studies along gradients of climate, soil, and land use intensity has been carried out during the past decade to allow more careful regional comparisons. Using the analysis of the Mongolian-North East China Transect (NECT), we can estimate the effect of land cover differences on ecosystem dynamics. The 30 m-Thematic Mapper data provides a way to identify fine scale features of the regional landscape patterns which are not captured by the 1-km AVHRR data. The focus of this paper is to evaluate the scale of land use and cover changes in the Asian region and the biogeochemical implications of these changes. The estimates of land cover and land use can vary depending on the spatial scale of the features represented across the land surface. Both physical and social factors influence the spatial extent these features represent. Therefore, the scale of land use intensification can affect the accuracy of land use area estimations. In particular, those regions of the world where land use practices are implemented via small individual holdings may be underestimated when using coarse scale remote sensing data such as AVHRR, where as the Thematic Mapper satellite data at 30 to 50 m resolution can provide a better estimate of land cover and land use area. The accuracy of the extrapolated fluxes of ecosystem dynamics and biogeochemical cycles are directly proportional to the accuracy associated with the land estimates. We will evaluate the land cover estimates in this region of Asia using these data sources. This region encompasses a broad set of precipitation and temperature regimes and includes characteristics of regional land cover and land use related to grazing systems and grain cultivation.

Conference Committee Involvement (15)

Remote Sensing and Modeling of Ecosystems for Sustainability XIV

9 August 2017 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability XIII

31 August 2016 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability XII

11 August 2015 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability XI

18 August 2014 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability X

27 August 2013 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability IX

16 August 2012 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability VIII

23 August 2011 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability VII

3 August 2010 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability VI

5 August 2009 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability V

13 August 2008 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability IV

28 August 2007 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability III

14 August 2006 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability II

2 August 2005 | San Diego, California, United States

Remote Sensing and Modeling of Ecosystems for Sustainability

2 August 2004 | Denver, Colorado, United States

Ecosystems Dynamics, Ecosystem-Society Interactions, and Remote Sensing Applications for Semi-Arid and Arid Land

24 October 2002 | Hangzhou, China

Showing 5 of 15 Conference Committees

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