Online resources for georeferencing
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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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Online resources for georeferencing

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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

    • 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

Search now with suggestions


Google Maps - Viewing

Satellite

Maps

Terrain (under ‘More’)

Earth (plug-in required)


Google Maps – Street View

Street View


Google Maps – Street View

I collected here


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)


Google Maps – Getting coordinates

Google Maps Labs

LatLng Marker

Right-click and‘Drop LatLng Marker’

(activate in ‘Labs’ first)


Google Maps – Getting coordinates

Canadensys bookmarklet

Click to toggle

Crosshairs

Pan map to change position

Click to get coordinates


Google Maps – Measuring extent

Distance Measurement Tool

(activate in ‘Labs’ first)


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)


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


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


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/


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/


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/


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


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


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


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


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


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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