gps/gis applications in agriculture gary t. roberson agricultural machinery systems
TRANSCRIPT
GPS/GIS Applications in Agriculture
Gary T. RobersonAgricultural Machinery Systems
GPS/GIS Applications
Guidance Point Guidance Swath Guidance
Control Variable rate
application Variable depth
tillage Variable irrigation
Mapping Soil properties Chemical
Application Chemical
Prescriptions Tillage Maps Yield Mapping Pest Mapping Topographic Maps Planting Maps
Field Mapping
Position data (georeference data) recorded at predetermined intervals.
Other data recorded manually or automatically by monitor, computer, or data logger.
Data displayed by geographic information system (GIS) in thematic map format.
Soil Sampling
Georeferenced soil samples can be collected
Sampling Methods Grid sampling: intensive sampling of
entire field Directed sampling: intensive
sampling of particular target areas
Grid Sampling
Data collected for each cell or point
Multiple samples combined into each cell or point sample
Directed Sampling
Sampling zones established based on knowledge of field
GPS used to locate sample points.
Areas of interest intensely sampled, others lightly sampled
Crop Maze
Field Boundary, Vollmer Farm, Bunn, NC
Crop Maze
Crop Maze
5 acre corn field Creative minds Sub meter DGPS Field computer Mapping software
450 foot tall wolf
Yield Maps
Record of spatial yield variability within a field or farm.
GPS data coupled with yield data to produce map. Mechanically harvested Hand harvested
Useful tool for decision making.
Cotton Yield Map
Field Scouting
Fields can be scouted for a variety of pests
Pest populations recorded on mapsDecision tools can be applied on a
site specific basis
Weed Map
Variable Rate Control
Application rates designed for needs of small sections of a field
GPS determines position of equipment in the field
Computer controls use GPS data and prescription files to adjust rate
Prescription Map