Raven Envizio Pro, Инструкция по установке и эксплуатации

Страница: 100 / 287

6
P/N 016-0171-493 Rev. I 85
Basic Operation
Prescription Maps and Variable Rates
With the optional variable rate application (VRA) feature enabled, the Envizio Pro is capable of using a
prescription map to automatically change the target application rate.
Envizio Pro field computer uses the shapefile format for prescription maps used to provide variable rate
product control. If the variable rate feature is activated, a prescription map, created using GIS (Geographic
Information Systems) software capable of creating shapefiles, may be transferred to the field computer. These
shapefiles must be in a polygon shape format that complies with the ESRI (Environmental Systems Research
Institute) shapefile specifications and must also be in the WGS (World Geodetic System) 84 datum.
The .shp, .shx, and .dbf files required to create a shapefile prescription map must be saved to the rxMaps
folder on a USB flash drive to allow the field computer to locate and transfer the required files to internal
memory. Refer to the Chapter 8,
Software Updates and File Maintenance , for additional assistance with
performing file maintenance or creating the required folder structure on a USB flash drive for use with the
Envizio Pro.
To ensure peak performance of the field computer during variable rate applications, create maps with a
minimum number of zones. Maps with too many zones may yield undesired results or limit performance of the
field computer. To help limit the number of zones within a map, use the equipment, or Guidance, width as a
guide. The smallest zones on the map should be no smaller than the width of the equipment applying the
product. For example, if the boom on a sprayer is 90 feet [27 m] wide for each swath, zones within the
prescription map should not be less than 90 feet [27 m] square.
If the prescription map contains zero rate zones, the system must have either a PWM or Fast valve controlling
product. The valve type and valve cal programmed on the field computer must be set to PWM Close or Fast
Close mode, depending upon which valve is installed in the system. See the
Prescription (Rx) Settings section
on page 112 for additional prescription map set up information.
Note:
If the optional AccuBoom system is enabled, AccuBoom will turn off sections valves in zero rate
zones.
Loading Prescription Maps
Prescription maps are loaded onto the field computer using the File Maintenance features described in the File
Maintenance section on page 140.
Prescription maps must have three separate files, each with the same file name. A file with the .shp, .shx, and
.dbf file extensions are all essential for each prescription map to function correctly. If any of these files are
missing, or named differently, from the rxMaps folder, the field computer will not be able to load the prescription
map.
Note:
Names of prescription map files loaded on the field computer cannot begin with a space.