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USING UTM

Steve Allen KCSARA SAR Academy April 2010. USING UTM. Objectives. Understanding UTM system Finding coordinates of a point Plotting a point. Metric units (meters) World is split into 60, 6º degree zones Seattle area is Zone 10N

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USING UTM

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  1. Steve Allen KCSARA SAR Academy April 2010 USING UTM

  2. Objectives • Understanding UTM system • Finding coordinates of a point • Plotting a point

  3. Metric units (meters) World is split into 60, 6º degree zones Seattle area is Zone 10N Distorted above North 84º, and South 80º, not applied above these latitudes. Smallest grid unit on USGS 1:24000 maps is 1 km. May be different on different scale maps! Coordinates get larger going east (easting) from the zone meridian and larger going north (northing) from the equator. Universal Transverse Mercator (UTM)

  4. To Describe a Location • Datum • Zone • Northing • Easting

  5. Datums • NAD 27 • Most older printed maps (Greentrails, USGS) • NAD 83 /WGS 84 • Coordinates from aircraft • Coordinates from 911 dispatcher • Default new GPS unit “out of the box” • NAD 83 and WGS 84 are virtually the same for our purposes

  6. Map Datum

  7. United States UTM Zones

  8. State of Washington UTM Zones

  9. Identifying the grid 466 467 (Easting) 5157 5157 Map 5156 5156 (Northing) 466 467

  10. 5157 5156 Determining Coordinates: Easting Determine the easting first: From the object on map ( ) go to the bottom (or top) edge of the map Find the nearest smaller coordinate to the LEFT (W) of your point 465 466

  11. Determining Coordinates: Easting

  12. Determining Coordinates: Easting Divide the distance between the coordinate to the left of your point and the coordinate to the right of your point into tenths 3tenths This is hundreds of meters 465 466

  13. Determining Coordinates: Easting

  14. 5156 5157 466 465 Determining Coordinates: Northing From the point on map ( ) look to the left (or right) edge of the map Find the nearest coordinate below (S) of your point

  15. Determining Coordinates: Northing

  16. 5157 5156 Determining Coordinates: Northing Count or estimate the number of tenths from the coordinate BELOW your point TO the corner. This is hundreds of meters 8Tenths

  17. Determining Coordinates: Northing

  18. Final Coordinates of 465300E 5165800N But we can go finer, if we use a template

  19. Template • Must match map scale! • 1:24,000 (USGS, 7.5 min, 1 in = 2000 feet) • 1:25,000 (USGS, 15 min, 1 cm = 0.25 km) • 1:63,360 (USGS, 15 min, 1 in = 1 mile) • 1:69,500 (Greentrails, 15 min) Warning - Photocopied map or map printed from “Topo” may have an odd scale

  20. Starting corner: 465000E 5165000N Template placed on map at kilometer grid corner Using a Template • Can estimate how far into box on a scale of 1 to 10 to find nearest ten meters. 5165820N 465360E

  21. Starting corner: 465000E 5165000N Another Way to Use the Template • Put the 0 corner of the template on the point. • Read where the block margin hits the template scales. 465360E 5165820N

  22. Determining Coordinates 489520E 5315440N Start here. 489000E, 5315000N

  23. Plotting Points • Underline the last 3 digits of each coordinate. • What’s not underlined are the margin coordinates. Example: 490120E 5315340N Use template to determine position within the kilometer box.

  24. Start here. 490, 5315 Plotting 490120E 5315340N 490120E 5315340N

  25. Questions?

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