Opens a form in order for the program to calculate the Height Above Average Terrain (HAAT) of a selected unit. The antenna height above ground has to bespecified for the unit.

Centre

Select the unit to be centre of the calculation.

Antenna height above ground (m)

Antenna height above ground in meters for this calculation.

Settings for HAAT calculation

Azimuth step

The step in degrees at which radials have to be used.

Start at distance (Km)

The distance at the radial calculated from the centre unit at which the first height must be determinated.

Number of heights taken at the radial. It sets the maximum ditance at which ground heigth wil be measured. This is Start distance + ( number of points x distance)

Distance step (Km)

It produces a result as displayed below:

[USA Default] button and [Euro Default] button

These buttons preset all settings to defaults:

Default values USA Euro
Azimuth step 45 10
Start at distance (Km) 3 5
Number of points per radial 51 3
Distance step (Km) 0,26 3

Compute

Compute HAAT. After calculation Notapad will be opened and present the file Haat.txt with the calculation results.

Cancel

Cancel operation.

Explanation

For unit 'PI2APD' HAAT is calculated. In this example the following settings are used for explanation:

As a result of this at 16 radials at a distance of 2 and 4 km (start is 2 Km, and step is 2 Km) ground height is determinated from DEM. Using 'Draw rings' the points that are calculated are displayed in the following image.

After calculation the following file is opened:

Haat.txt
Height Above Average Terrain
Report generated at 21:42:31 , 4-8-2011
------------------------------------------------------------
Antenna geographic coordinates
52°13'11"N,005°59'25"E
JO22XF
Ground elevation: 10,4m
------------------------------------------------------------
Antenna height above ground: 25m
------------------------------------------------------------
Azt(°)    D(km)    Ground elevation(m)
000    02,00    0005,9
000    04,00    0007,0
000    Average    6,45m
000    HAAT    28,9500015258789m
023    02,00    0004,0
023    04,00    0003,0
023    Average    3,5m
023    HAAT    31,9000015258789m
045    02,00    0007,0
045    04,00    0004,0
045    Average    5,5m
045    HAAT    29,9000015258789m
068    02,00    0008,0
068    04,00    0005,0
068    Average    6,5m
068    HAAT    28,9000015258789m
090    02,00    0007,0
090    04,00    0005,0
090    Average    6m
090    HAAT    29,4000015258789m
113    02,00    0010,0
113    04,00    0009,9
113    Average    9,95m
113    HAAT    25,4500015258789m
135    02,00    0018,0
135    04,00    0007,0
135    Average    12,5m
135    HAAT    22,9000015258789m
158    02,00    0012,0
158    04,00    0012,1
158    Average    12,05m
158    HAAT    23,3500015258789m
180    02,00    0015,5
180    04,00    0018,0
180    Average    16,75m
180    HAAT    18,6500015258789m
203    02,00    0014,4
203    04,00    0021,0
203    Average    17,7m
203    HAAT    17,7000015258789m
225    02,00    0016,0
225    04,00    0023,0
225    Average    19,5m
225    HAAT    15,9000015258789m
248    02,00    0018,0
248    04,00    0025,4
248    Average    21,7m
248    HAAT    13,7000015258789m
270    02,00    0020,5
270    04,00    0036,0
270    Average    28,25m
270    HAAT    7,15000152587891m
293    02,00    0022,1
293    04,00    0034,3
293    Average    28,2m
293    HAAT    7,20000152587891m
315    02,00    0013,0
315    04,00    0023,2
315    Average    18,1m
315    HAAT    17,3000015258789m
338    02,00    0010,0
338    04,00    0010,4
338    Average    10,2m
338    HAAT    25,2000015258789m
------------------------------------------------------------
Antenna elevation above sea level       : 35,4m
Average ground elevation above sea level: 13,93m
------------------------------------------------------------
HAAT: 21,4700015258789m