inputs are best suited to assessments of large forested tracts of land where stand ages are relatively uniform.
On the other hand, we have also conducted a ground check in order to validate our result. Administratively Kalimantan is divided into 4 parts: South
Kalimantan, East Kalimantan, West Kalimantan, and Central Kalimantan. In this study, three of them have been chosen in order to do the ground truth for the
spatial distribution of NPP. Validation of the NPP is an essential step in establishing its utility; however, validation is challenging because of a variety of
scaling issues. Site-level validation of MODIS NPP has been more limited because of the logistical constraints of measuring NPP and scaling it to the size of
a MODIS grid cell. For this research, we have chosen South Kalimantan, East Kalimantan, and Central Kalimantan for the ground check. We checked what kind
of features exists exactly in the area, and how can we come up with a conclusion based on what we found in the area with our system. For this validation, we
considered the data of 2010 because if we consider the data from 2001, for sure many changes have been occurred and it made the system very complex.
High NPP
Figure 21 Location for ground check and validation of NPP
4.6.1 Ground check for water body
Low NPP
For water body, the value of NPP ranged from 0 gC m
-2
yr
-1
to 100 gC m
-2
yr
-1
. Figure 22 shows that along the river, the value of NPP is low while as long as we got far from the river where there was lots of vegetation, the value of NPP
increased. It was difficult to detect the water body from the remote sensing data but the result showed that the river could be determined with its NPP value.
Figure 22 Ground check location for water body
4.6.2 Ground check for forest
Figure 23 and Figure 24 shows that forest gave the highest NPP which ranged from 1,200 gC m
-2
yr
-1
to 1,600 gC m
-2
yr
-1
.
Figure 23 Ground check location for forest a
West view North view
East View
South view Figure 24 Ground check location for forest b
Lowland tropical rainforests are rapidly disappearing due to fire, logging, and agriculture. Research and restoration efforts are urgently needed, especially in
understudied and underserved areas like Borneo. Borneo is the world’s third largest island and also home to many endangered species, including orangutans.
Figure 25 Forest Map of South Kalimantan
Figure 25 shows a sample of the forest map in South Kalimantan. After a comparison with the result of NPP based on visual interpretation, we can easily
determine that the location where the value of NPP is very high is located in the protection forest.
4.6.3 Ground check for Peatland
Figure 26 shows that NPP value in peatland area varied from 200 gC m
-2
yr
-1
to 600 gC m
-2
yr
-1
.
Figure 26 Ground check location for peatland
4.6.4 Ground check for Palm Oil
Figure 27 shows that NPP in palm oil plantation area varied from 1,000 gC m
-2
yr
-1
to 1,300 gC m
-2
yr
-1
. It was lower than of forest. It might be because of the canopy since for palm oil plantation, there is a space between two trees which
is not the case for forest.
Figure 27 Ground check location for palm oil plantation a
Figure 28 Ground check location for palm oil plantation b
4.6.5 Ground check for Mining area
