Campbell CM10K Spezifikationen PDF herunterladen (Seite 13)

The climate equipment itself requires an area of 60-65 m

, where the tower and sensors will be

installed. However an area of this size is not enough to site the station appropriately. As

described in the section above, different sensors need to comply with specific distance

requirements to nearest obstacles such as trees, houses and roads (WMO 2008, EPA 1995).

Following the guidelines described above, the first step consists in determining whether the open

area is large enough to house the station. This will depend on the location of the open area and

what is around it.

Ensure the open area has the right characteristics. Following the guidelines above, make sure

the open area is on level ground (not on sloping ground), not located in a valley or hollow, not

located in a swamp or in low areas that hold water after rain. If the open area is near a road,

make sure it is at least 30 m away from it.

Measure the height of the tallest obstacle next to the open area. If available use a rangefinder,

such as the Nikon Forestry 550, (see list of equipment) to estimate the height of the tallest object

you can see next to the open area, for example the tallest tree (see http://www.edb.ups-

tlse.fr/equipe1/chave/tree-height-protocol.pdf for a suitable protocol). The height of the closest

object can also be estimated by using a compass and measuring tape if a rangefinder is

unavailable (see http://www.tiem.utk.edu/bioed/bealsmodules/triangle.html for information on

how to do this). If the width of the open area is not at least 4 times the height of this obstacle

then the open area is too small. Unless this obstacle can be removed or the open area expanded, a

new open area needs to be located. If no other open areas are available then go to Section 2.8

(Level 4 siting).

Tentatively locate the base tower. Position yourself in the approximate center of the open area,

locate the tallest object of height H (Figure 5 A) and:

a) Mark your location. This is the tentative location for the base tower.

b) Measure the distance from this location to the tallest obstacle.

c) If the distance is larger than or equal to 4 times the height of the obstacle (4H in Figure 5

A), then proceed to step e), otherwise,

d) Go back to the tentative location and move away from the obstacle until you are at least

4H meters away from the obstacle.

e) Mark this as your new tentative location for the climate station.

Locate the next tallest obstacle. From the tentative location where you are, now locate the next

tallest obstacle in the open area with height T (Figure 5 B). Go through steps b) to e) as required

until your location is 4T meters away from the obstacle ( Figure 5 B,C). Ensure that you are still

at least 4H meters away from the first obstacle.

Repeat this process until you have no more obstacles. (Figure 5 D, E) Always ensure that you

are keeping appropriate distances to all obstacles. Mark the final location; this will be the

location of the base tower (see Figure 5 D,E).

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Campbell CM10K Spezifikationen Seite 13