2. Introduction
In Mongolian rivers in recent years, climate change
implications. Mongolian's largest lake water level
increased from the beginning of 1990 to mid 1960, has
been declining in recent years.
3. Objective
1. To determine lake area change using satellite data
2. SPOT VEGEATATION satellite data used for vegetation
change in lake basin
3. To calculate the impacts of main socio-economic
activities on Telmen lake basin
4. To calculate the impacts of precipitation, drought and
temperature for Telmen lake area
4. Study area
Lake Telmen basin is located in
Khangai Province of Mongolia
(N48°50 E 97°19). The lake lies
near the boundary between the
forest–steppe and steppe ecosystem.
Surface elevation 1789m. The mean
annual precipitationis 250 mm.
5. Data
• Landsat TM, ETM+, OLI/TIRS
P138R26 =1986,1987,1989,1991,1994,1995, 1998 –
2014 between 6-9 year
• Spot Vegetation satellite data:
2000-2013 between 6 - 9 months 2,3 bands data
• Meteorological data (temperature, perception from
June-to September) 1993– 2013(Numrug station)
• Socio-economic data (population, livestock, crop and
forage area )
• Ground truth measurement data (2013, 2015 year)
6. Methodology
NDWI is defined as (Mcfeeters, 1996)
𝑵𝑫𝑾𝑰 =
𝑷 𝑮𝒓𝒆𝒆𝒏− 𝑷 𝑵𝑰𝑹
𝑷 𝑮𝒓𝒆𝒆𝒏+ 𝑷 𝑵𝑰𝑹
Where 𝑃𝐺𝑟𝑒𝑒𝑛 and 𝑃 𝑁𝐼𝑅 are the reflectance of the green
and NIR bands, respectively.
7. Research analysis
Classification SPI
1 Extremelywet 2
2 Very wet 1.50-1.99
3 Moderatelywet 1.00-1.49
4 Near normal 0.99-0.99
5 Moderatelydry -1-1,49
6 Severely dry -1.5-1.99
7 Extremelydry -2
The SPI is a drought index first developed
by T. B. McKee, N.J. Doesken, and J.
Kleist and in 1993 (McKee et al. 1993).
8. Research analysis
Classification Aridity index
Hyper arid AI˂0.05
Semi arid 0.05˂AI˂0.20
Arid 0.20˂AI˂0.50
Dry sub humid 0.5˂AI˂0.65
Aridity index
Dry index that was invented by De Martonne in 1926, expresses climate’s
humidity or dry condition in local area
11. Result
Telmen lake
Variable r P
MSAVI 0.43 0.12
Precipitation (mm) 0.47 0.08
Temperature (Cº) 0.16 0.56
Livestock (thousand) 0.82 0.002
Crop and forage area (ha) 0.77 0.001
Population 0.64 0.002
Parameters of regression models of the Lake basin.
12. Combination NDWI and Band 5 is good source for area
estimation for Telmen lake basin. We determined lake area
from 1998 to 2013 using the Landsat images.
It is timely and economically important to use remote sensing
and geographic information system technologies for surveying
surface water and usage of vegetation.
Conclusion
