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Online resources for georeferencing http:// herpnet.org/Gazetteer/GeorefResources.htm Online resources for georeferencing http://canadensys.net/digitization/georeferencing Google Maps http://maps.google.com Search & directions Free text search, zoom -dependent

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PowerPoint Slideshow about 'Google Maps' - Olivia


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slide1

Online resources for georeferencing

http://herpnet.org/Gazetteer/GeorefResources.htm

slide2

Online resources for georeferencing

http://canadensys.net/digitization/georeferencing

google maps
Google Maps
  • http://maps.google.com
  • Search & directions
    • Free text search, zoom -dependent
    • Directions for travelling by car, bike, public transport and foot
    • Data compiled from different sources
  • Maps
    • Datum: WGS84
    • Views: map, satellite (= aerial photography), terrain, Google Street View + various layers of information
    • Data compiled from different sources (indicated at the bottom of each map)
  • Third Party Plug-ins extend functionality
google maps searching
Google Maps - Searching

Search now with suggestions

google maps viewing
Google Maps - Viewing

Satellite

Maps

Terrain (under ‘More’)

Earth (plug-in required)

slide8

Google Maps – Getting coordinates

  • Requires additional widgets or plug-ins
    • Activate LatLng Marker in Google Maps Labs
    • Install a mapplet like GPS Location or Position Finder in ‘My Maps > Browse the directory’. Now deprecated!
    • Use Canadensys LatLong Crosshairs bookmarklet: http://www.canadensys.net/georeferencing
  • Use Distance Measurement Tool to measure extent
  • Use My Maps to save markers, create maps, share with others (including kml import)
slide9

Google Maps – Getting coordinates

Google Maps Labs

LatLng Marker

Right-click and‘Drop LatLng Marker’

(activate in ‘Labs’ first)

slide10

Google Maps – Getting coordinates

Canadensys bookmarklet

Click to toggle

Crosshairs

Pan map to change position

Click to get coordinates

slide11

Google Maps – Measuring extent

Distance Measurement Tool

(activate in ‘Labs’ first)

slide12

Google Earth

  • http://earth.google.com
  • 3D globe desktop application
  • Same data as Google Maps
    • Datum: WGS84
    • No Map or Terrain view
  • Similar functionalities as Google Maps
    • Search more limited than Google Maps (no suggestions)
    • Right-click and choose ‘Get Info’ for coordinates
    • Use ruler to measure extent
    • Several coordinate formats
    • Numerous information layers (format: kml)
slide13

AcmeMapper

  • http://mapper.acme.com/
  • Google Maps interface
    • Datum: WGS84 (& NAD27)
    • Map, satellite, hybrid and terrain
    • Topo, DOQ, NEXRAD and Mapnik
    • Free text search not Zoom level-dependent
    • Markers cannot be moved, but new markers can be placed at crosshairs (click ‘Mark’)
    • Several coordinate formats for each marker + heading and distance from crosshairs
    • Saves all markers automatically
slide14

EarthTools

  • http://www.earthtools.org/
  • Worldwide gazetteer for citiesand towns
  • Google Map basemaps
  • Great for hard to find localities, especially outside US
    • Datum: WGS84
    • Search with country or worldwide
    • Provides DMS, DD, UTM coordinates
    • Includes contours (but spotty coverage)
  • Example: Qandahar or Kandahar, AF
slide15

GEOnet Names Server (GNS)

  • http://earth-info.nga.mil/gns/html/
  • Worldwide data from NGA andUS BGN
    • NIMA = National Imagery andMapping Agency
    • Datum: WGS84
    • Degrees minutes seconds,precision to nearest minute
    • Feature type
    • Used as a source for many gazetteers
  • For US data, use Geographic Names Information System (GNIS): http://geonames.usgs.gov/pls/gnispublic/
slide16

Geographical Name Search Service (GNSS)

  • http://gnss.nrcan.gc.ca/gnss-srt/searchName.jsp
  • Canadian data by the CanadianGeographical Names Service(CGNS)
    • Datum: NAD83
    • Degrees minutes seconds anddecimal degrees
    • Feature type
  • Full Canadian Geographical Names datasets can be downloaded from GeoBase: http://www.geobase.ca/
slide17

Falling Rain

  • http://www.fallingrain.com
  • Worldwide gazetteer for citiesand towns
  • Great for hard to find localities,especially outside US
    • Datum: WGS84
    • Degrees minutes (seconds), based on NIMA
    • Browse to find locality (no search)
    • Provides hierarchy, alternative names, topo maps, altitude, weather information and location of nearby towns in nautical miles (nm). Tip: Use Google/Chromey to translate nm into km.
  • Example: Qaryeh-ye Gol`alam, Velayat-e Lowgar, AF
  • You can also check against Statoids: http://www.statoids.com/
slide18

Getty Thesaurus of Geographic Names (TGN)

  • http://www.getty.edu/research/conducting_research/vocabularies/tgn/
  • Worldwide gazetteer byThe Getty
  • Useful for finding alternativeand old names
    • Feature types
    • Geographical hierarchy
    • Coordinates only to minutes (or not at all)! Use recent name and search in Google Maps
  • Example: Big Apple, inhabited place, United States
slide19

FuzzyG – JRC Fuzzy Gazetteer

  • http://dma.jrc.it/services/fuzzyg/
  • Worldwide gazetteer designed for bad spelling!
  • Useful for finding alternative, doubtful spelling,old names
    • Feature types
    • By continent
    • Coordinates only to minutes (or not at all)! Use recent name and search in Google Maps
  • Example: Narobi, Africa
slide20

UTM & MTM

  • UTM = Universal Transverse Mercator
    • Divides earth in 60 UTM zones = 6 degrees per zone
    • Datum: WGS84 and others
    • Notation: Zone Easting Northing = 17N 630084 4833438
    • Zone includes hemisphere (17N) or latitude band (17T): MGRS
    • Default extent: 30m (if recorded with GPS receiver)
    • http://www.dmap.co.uk/utmworld.htm
    • UTM Calculator: http://bit.ly/bdxn37
  • MTM = Modified Tranverse Mercator
    • Used in Canada: zones are 3 degrees, different codes, false easting and scale, etc.
    • UTM/MTM Calculator: http://bit.ly/utmmtm
slide21

UTM – 17T 630084 4833438 (CN Tower in Toronto)

Equator = 0m northing

4833438m northof equator

Equator = 10,000,000m

false northing for

Southern Hemisphere

Central meridian= 500,000mfalse easting

130084m east ofcentral meridian

Georeferencing workshop - Online resources - 2010.06.05

21

slide22

Public Land Survey System (PLSS)

  • Mainly used in the US West, Midwest and some Southern states in early surveys
  • System of Township-Range-Section (TRS):T13N-R14E-S15, Arizona, Coconino County
  • Graphical Locator: http://www.esg.montana.edu/gl/
    • Translates TRS in decimal degrees
    • Datum: NAD27
  • Determine state and meridian (BLM):http://bit.ly/bSouTw
  • For extents: http://manisnet.org/GeorefGuide.html
slide23

Other Resources

  • GPS Visualizer: http://www.gpsvisualizer.com/
    • Use to translate a file with coordinates into kml or a picture
    • Similar: http://www.simplemappr.net/ for publications
  • GeoLocate: http://www.museum.tulane.edu/geolocate/
    • Georeferencing desktop and web application
    • Useful for roads and rivers (US only)
  • Statoids: http://www.statoids.com/
    • Information about administrative divisions (provinces, counties) and their history, area, population, codes, etc.
    • No coordinates!
    • Similar: CIA World Factbook http://bit.ly/dDtT1i
  • See http://herpnet.org for more…
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