CRSC 6 – Introduction to Precision Agriculture

Chapter 6 Study Guide

I.Introduction

  1. True or False. Data needs to be processed into maps in order to be most useful.

II.Who Will Generate the Maps?

  1. True or False. The inexperienced user can generate misleading results.
  1. List at least three reasons why farmers may want to generate GIS data themselves.

III.Basics of GIS

  1. True or False. A yield monitor sampling once per second can collect up to 500 data points per acre.
  1. A basic base system provides for ______, ______, and ______of data.
  1. A GIS database contains ______data. It also is referred to as ______data.
  1. A GIS attaches a ______in a field with data values.
  1. True or False. A GIS can link more than one data value to each georeferenced coordinate.

IV.Different GIS Data Formats

  1. In a ______format, the space is divided into cells located by coordinates.
  1. Each cell is addressed by a ______and a ______.
  1. True or False. Raster displays have a stair-stepped appearance.
  1. True or False. Vector maps can be created faster than raster maps.
  2. Vector maps use ______, ______and ______as basic elements.
  1. Vector methods simulate geographic ______.
  1. True or False. Most GIS packages can store only raster data.

V.Coordinate Systems

  1. List the four most common coordinate systems.
  1. A local coordinate system used on a farm field is referenced to a ______in the area.
  1. True or False. The problem with a local coordinate system is that it doesn’t correspond directly with USGS or soil survey maps.
  1. Lat/Long coordinates are measure of ______from the equator or the prime meridian.
  1. One second of latitude is about _____ meters.
  1. A second of longitude varies because lines of longitude ______.
  1. ______is a metric coordinate system commonly used for mapping at scales from 1:500,000 to 1:24,000.
  1. Coordinate values in UTM are given in ______with the vertical called ______and the horizontal called ______.
  1. A reference plane of projection is called a ______.
  1. Three common projection datums are ______, ______and ______.
  1. Most GPS receivers can use several datum but ______is the most common.
  1. UTM has projections containing ______designations.
  1. There are ______UTM zones starting at ___ continuing east from 180 degrees longitude.
  1. True or False. Satellite imagery is usually supplied in UTM.
  1. Check the following that applies to the State Plant Coordinate System.

______based on a single map projection

______shown on USGS topographic maps

______based on WGS84

______can have problems at neighboring state boundaries

______often used by FSA/NRCS

  1. GPS receivers store data in ______, thus so do yield monitors.
  1. In order to “layer” information one must have translated the data into a common ______system.

VI.Methods Used to Analyze Precision Farming Data

  1. ______techniques are used to help visualize trends in data.
  2. Define interpolation.
  1. Identify the interpolation method as NN-Nearest Neighbor, LA-Local Average, IDW-Inverse Distance Weighted, C-Contouring or K-Kriging.

______connecting points of the same elevation

______closest sample to the unknown is used

______average a selected number of points around a desired location

______samples closer to unsampled location have more weight

______uses measurement of variability

______Pre-interpolation determines rate of change of data values

VII.GIS: Computer Hardware and Software

  1. List the five hardware components of a GIS

  1. Check the items as good recommendations for making the best use of GIS software:

______PC card reader

______Pentium I Processor

______large hard disk drive

______15 inch monitor

VIII.GIS for Precision Farming

  1. List the six steps for creating maps with GIS.
  1. The most common method for loading data utilizes a ______.
  1. The most common type of PC card is a ______card.
  1. ______cards have a limited number of read/write cycles.
  1. The best data formats are able to ______the data and store more information.
  1. The most common data format is the comma delimited ______text.
  1. In ______the user traces the boundaries of fields with a pointer and clicks a button to enter data points.
  1. When scanning maps one must be sure that all layers have a ______coordinate system.
  1. List at least six common data layers in a GIS used for precision farming.

Chp 6-1