Bacchi, Gustavo Sanches
Table 2: Summary of the results obtained from the accuracy analyses.
Aerial photograph SPOT image
Index (%) Land cover classes _ Other classes | Land cover classes Other classes
Comission 6.5 14.4 5.7 10.6
Omission 50.3 1.0 45.2 1.0
Accuracy 49.7 99.0 54.8 99.0
Land cover classes 11.0 0.8 13.5 0.8
Other classes 10.6 77.6 8.1 77.7
Kappa 0.57 0.62
Total accuracy 88.62 91.11
5 | CONCLUSIONS
According to the presented results and to the applied methodology in this study, it is possible to conclude the following:
- A land cover map produced from the digital aerial photograph consumes more processing efforts than from the SPOT
image.
- The SPOT image is more adequate for the land cover map
photograph.
It is important to remember that these statements are valid for the regional approach land cover mapping, which is
characterized by the demand for low cost technology and procedures, and which has small watershed planning its main
study focus.
of watersheds at the analyzed map scale than the aerial
REFERENCES
GOODCHILD, M.F.; KEMP, K.K. Technical issues in GIS: NCGIA Core Curriculum. Santa Barbara, 1991. National
Center for Geographical Information and Analysis. University of California.
Research Systems, Inc. ENVI User's Guide: the environment for visualizing images. Lafayette, 1997.
JENSEN, J.R. Introductory digital image processing: a remote sensing perspective. Englewood Cliffs, Prentice-Hall,
1986.
ANDERSON, J.R. Sistema de classificagdo do uso da terra e do revestimento do solo para utilizacáo com dados de
sensores remotos. Trad. de Harold Strang. Rio de Janeiro, IBGE, 1979.
CAHILL, T.H.; HORNER, W.R.; MCGUIRE, J.S. GIS watershed applications in the analysis of nonpoint source
pollution. In: National Conference on Environmental Problem-Solving with Geographical Information Systems.
Proceedings. Cincinnati, Ohio, 1995. p.110-130.
RICHARDS, J.A. Remote sensing digital image analysis: an introduction. 2.ed., Australia, 1994.
100 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000.
