This preview shows pages 1–5. Sign up to view the full content.
1Measurements From MapsBefore taking measurements, ensure that:Caution!The _______________is appropriate.Accuracy Standards/Source are known.Appropriate Scale.Map is up-to-date.Map is in good condition (shrinkage, tears).Measurements From Maps (Cont.)Distance Measurements.Scaling- Using the scale to measure distance. Techniques can include engineer’s scale, dividers, or marks on the edge of a piece of paper.Map Measurer- Device to measure distance on the map (inches, cms etc.) and then converted into real world distance.Computer assisted- GIS programs, Arc Info, Arc View.Map Measurer
has intentionally blurred sections.
Sign up to view the full version.
2Measurements From Maps (Cont.)Measuring Area.Direct Methods of Measurements.•Scaling and computation – estimated directly if the feature is rectangular or square (city block or a building).–Graphic Area Scale– superimposed upon transparent material that may be moved over the map.•Polar Planimeter– an instrument used to measure area in square inches or centimeters.91625Graphic Area Scale14Polar Planimeter