You are using an outdated browser that does not fully support the intranda viewer.
As a result, some pages may not be displayed correctly.

We recommend you use one of the following browsers:

Full text

Remote sensing for resources development and environmental management
Damen, M. C. J.

Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986
Comparison of SPOT-simulated and Landsat 5 TM imagery
in vegetation mapping
Institute for Biology and Geology, University of Tromse, Norway '
ABSTRACT: In this paper I will present some results from work done on both SPOT-simulated imagery and Landsat 5
TM imagery. The testarea is situated in Central Troms, Northern Norway, and has a fairly wide variation in eco
logical niches and comprises both forest landscape and mountain areas (Attic alpine vegetation). The ground
truth program did include both a traditional vegetation mapping program and a test-site program. Digital image
processing was carried out both on the SPOT-simulted imagery and the Landsat imageries, but the scenes were
taken too early in the spring or too late in the autumn, to give a sufficient basis for a good classification.
The investigation has shown that the Landsat scene from the springtime almost had the same accuracy by super
vised classification as the SPOT-simulated imagery, due to the better radiometric resolution for the TM-sensor
compared to the simulated HRV-sensor on the SPOT satellite. But classification on the SPOT-simulated imagery
showed that the vegetation units within small areas, were better picked out due to the better spatial resolu
tion, compared to the TM-sensor on the Landsat 5 satellite. Visual interpretation on the autumn-scene of Land
sat 5 TM-sensor gave a successful detection of swamp forests at the riverbanks by using the channel combina
tions of CH 456 and CH 543.
1 INTRODUCTION 2.3 Data acquisition
In Norway there are very small areas that have been
vegetation mapped, and there are in certain areas a
very strong need for vegetation-maps as a basis for
land use planning. Methods for mapping natural re
sources has been strongly develloped the last decades,
and one of the most used methods is Remote Sensing.
In comparison with personalintensive and conventio
nal methods, Remote Sensing from satellite give a good
ability for mapping and monitoring the natural re
sources, as a result of the great ceverage in area and
the ability for repetetive passes.
The aim of the present investigation is a comparison
of SPOT-simulated and Landsat 5 TM imagery for vegeta
tion mapping purposes.
2.0 The study area
In this present study I have selected one of the test-
areas which was included in the SPOT-simulation prog-
ram in Norway 1982. This area called Habafjell-Skrub-
ben (Cavarre in Sami language) is situated in the lar
gest valleysystem in Central Troms, Northern Norway,
and comprises parts of Rostadalen and Dividalen val
leys (figure 1). This area has a fairly wide variation
in ecologicalniches and most of the common vegetation
types in the central part of Troms are represented in
the study area. Forests covers about 60 % and alpine
vegetation 30 % of the land area (Elven & Vorren 1980)
2.1 Ground truth program
The ground truth program did include:
1. Traditional vegetation mapping of the whole study
area based both on IR-aerial- and BW-aerial photo
graphs .
2. A special training-site program.
3. Phytososiological investigation of the several
vegetation types within the study area.
2.2 Fieldwork
The fieldwork was carried out during June to September
1983 with supplementary visits to the area in 1984.
Two Landsat 5 TM scenes were ordered, the first from
3. june 1984 and the second from 2. October 1984.
Landsat 5 TM PASS 197/11 1984-06-03 Time: 09.50.00AM
Sunelevation: 42 degrees.
Landsat 5 TM PASS 197/11 1984-10-02 Time: 09.46.00AM
Sunelevation: 17 degrees
Figure 1. The position of the study area, and the most
important geographical names mentioned in the text.
(Based on Cappelen's map 9-10, 1:400 000).