97 
Class D: Uncovered areas which are occupied by roads, water channels or 
buildings. 
On the map there are some areas which are presented in a mixture of 
Class A and Class B. This means exactly that they are covered by a mixture of 
palatable and unpalatable species. This highlights an important decision to be 
faced by the rangeland manager: whether to control the invaders first and then 
institute system, or to use the area for grazing directly, considering that it 
has 50% palatable plants, or 50% of the carrying capacity of an area of Class 
A type. 
Two unclassified areas are shown on the map because of the appearance 
of cloud shade on the photos. 
Table 2 shows the detailed classification into 21 categories and how 
they are summarized into four classes. 
CONCLUSIONS 
Different plant species could be identified by multispectral remote 
sensing during an adequate period of the year. The combination of information 
obtained along different wave length bands provides essential data for the 
range manager to evaluate his range and to establish a suitable policy. A red 
filter with aerographic plus-X film (Panchromatic) gives more contrasted infor 
mation, in this period. Plus-X film with yellow filters provides a general idea 
about the green cover. Infrared black and white and color infrared films give 
specific information about plant condition, stage and maturity and show if the 
reflected surface is a living fresh body due to the high reflectance of the 
cell, walls and shape, in this band. Multispectral analysis gives integrated 
data. Choosing the right season for multispectral remote sensing operation is 
the most important factor to get useful results. This choice depends on the 
range manager's requirement for grassland evaluation. Application of remote 
sensing in range management decreases the number of specialists needed, decreases 
the time necessary for data collection and analysis, and replaces a major part 
of the field work to be done,but requires highly efficient interpretation of 
the images. Remote sensing techniques provide the range manager with real time 
information, but he should become acquainted with how to use this data to 
optimize his rangeland use. 
Further Applications : More research and publications are necessary 
about the application of remote sensing in the range management field. Spectral 
properties of plants in the range are required, to enable the selection of the 
right sensors and altitude. Combination between film and filters for each 
purpose are required studies. Estimating the carrying capacity, grazing pres 
sure, and calculating the pasture productivity through the application of 
remote sensing are important further applied research.