Measurements of land surface features using an airborne laser altimeter: The HAPEX-Sahel experiment

被引:21
作者
Ritchie, JC
Menenti, M
Weltz, MA
机构
[1] DLO,WINAND STARING CTR INTEGRATED LAND SOIL & WATER R,NL-6700 AA WAGENINGEN,NETHERLANDS
[2] USDA ARS,SW WATERSHED RES CTR,TUCSON,AZ 85719
关键词
D O I
10.1080/01431169608949179
中图分类号
TP7 [遥感技术];
学科分类号
081102 ; 0816 ; 081602 ; 083002 ; 1404 ;
摘要
An airborne laser profiling altimeter was used to measure surface features and properties of the landscape during the HAPEX-Sahel Experiment in Niger, Africa in September 1992. The laser altimeter makes 4000 measurements per second with a vertical resolution of 5 cm. Airborne laser and detailed held measurements of vegetation heights had similar average heights and frequency distribution. Laser transects were used to estimate land surface topography, gully and channel morphology, and vegetation properties (height, cover and distribution). Land surface changes related to soil erosion and channel development were measured. For 1 km laser transects over tiger bush communities, the maximum vegetation height was between 45 and 6.5 m, with an average height of 2.1 m. Distances between the centre of rows of tiger bush vegetation averaged 100 m. For two laser transects, ground cover for tiger bush was estimated to be 22.5 and 30.1 per cent for vegetation greater than 0.5 m tall and 19.0 and 25.8 per cent for vegetation greater than 1.0 m tall. These values are similar to published values for tiger bush. Vegetation cover for 14 and 18 km transects was estimated to be 4 per cent for vegetation greater than 0.5 m tall. These cover values agree within 1-2 per cent with published data for short transects (<100 m) for the area. The laser altimeter provided quick and accurate measurements for evaluating changes in land surface features. Such information provides a basis for understanding land degradation and a basis for management plans to rehabilitate the landscape.
引用
收藏
页码:3705 / 3724
页数:20
相关论文
共 24 条
[1]   RADIATIVE-TRANSFER IN SHRUB SAVANNA SITES IN NIGER - PRELIMINARY-RESULTS FROM HAPEX-SAHEL .2. PHOTOSYNTHETICALLY ACTIVE RADIATION INTERCEPTION OF THE WOODY LAYER [J].
BEGUE, A ;
HANAN, NP ;
PRINCE, SD .
AGRICULTURAL AND FOREST METEOROLOGY, 1994, 69 (3-4) :247-266
[2]   LASER ALTIMETRY MEASUREMENTS FROM AIRCRAFT AND SPACECRAFT [J].
BUFTON, JL .
PROCEEDINGS OF THE IEEE, 1989, 77 (03) :463-477
[3]   ENERGY AND WATER BUDGETS OF AN AREA OF PATTERNED WOODLAND IN THE SAHEL [J].
CULF, AD ;
ALLEN, SJ ;
GASH, JHC ;
LLOYD, CR ;
WALLACE, JS .
AGRICULTURAL AND FOREST METEOROLOGY, 1993, 66 (1-2) :65-80
[4]   RADIATIVE-TRANSFER IN SHRUB SAVANNA SITES IN NIGER - PRELIMINARY-RESULTS FROM HAPEX-SAHEL .1. MODELING SURFACE REFLECTANCE USING A GEOMETRIC-OPTICAL APPROACH [J].
FRANKLIN, J ;
DUNCAN, J ;
HUETE, AR ;
VANLEEUWEN, WJD ;
LI, XW ;
BEGUE, A .
AGRICULTURAL AND FOREST METEOROLOGY, 1994, 69 (3-4) :223-245
[5]   APPLICATIONS OF A LASER SCANNER TO QUANTIFY SOIL MICROTOPOGRAPHY [J].
HUANG, CH ;
BRADFORD, JM .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1992, 56 (01) :14-21
[6]  
KRABILL WB, 1984, PHOTOGRAMM ENG REM S, V50, P685
[7]  
McCuen R H., 1986, Hydrologic Modeling: Statistical Methods and Applications
[8]   ESTIMATION OF EFFECTIVE AERODYNAMIC ROUGHNESS OF WALNUT GULCH WATERSHED WITH LASER ALTIMETER MEASUREMENTS [J].
MENENTI, M ;
RITCHIE, JC .
WATER RESOURCES RESEARCH, 1994, 30 (05) :1329-1337
[9]  
MENENTIL M, 1992, P INT GEOS REM SENS
[10]   ESTIMATING FOREST BIOMASS AND VOLUME USING AIRBORNE LASER DATA [J].
NELSON, R ;
KRABILL, W ;
TONELLI, J .
REMOTE SENSING OF ENVIRONMENT, 1988, 24 (02) :247-267