Local coordinates (Cartography 🗺️)
Local coordinates are the ones used in a local coordinate system or a local coordinate space. Simple examples: Houses. In order to work in a house construction, the measurements are referred to a control arbitrary point that will allow to check it: stick/sticks on the ground, steel bar, nails... Addresses. Using house numbers to lo...
https://en.wikipedia.org/wiki/Local_coordinates
#LocalCoordinates #Geometry #Cartography #ComputerGraphics #CoordinateSystems
One year after the release of the renewed and updated https://spatialreference.org/ , it is now the first in Google when you search "epsg list" (at least in my incognito mode). 🎉
Now also with the "Explorer" functionality to make things even easier.
PS: SpatialReference is maintained by the PROJ team
Talk "Introduction to Vertical Coordinate Systems" from #foss4ge2024 in Tartu
https://www.youtube.com/watch?v=tELPb9G64zU
The slides in PDF are available in the description of the video and in my web page.
#FOSS4GE #FOSS4G #GIS #coordinatesystems
Talk "WGS 84: I don't know, I don't care" from #foss4ge2024 in Tartu.
https://www.youtube.com/watch?v=M2ck3cAGvhg
The slides in PDF are available in the description of the video and in my web page.
#FOSS4GE #FOSS4G #GIS #coordinatesystems
Tomorrow I am travelling to Crete to attend the #ESWC2024. Sunday, during the #GeoLD workshop, I will be presenting the #GloSIS web ontology. Also in the #GeoLD I am co-authoring a position paper making the case for a #SemanticWeb standard for #CoordinateSystems.
As A USGS Employee Working In Spatial Data: hehehehehehehehe
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https://xkcd.com/2920/ <-- link to XKCD cartoon
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"The standard North American NAD83 coordinate system is misaligned from the actual Earth, off-centre by about 7 feet. Someone knows where I am, and I'm in the wrong place."
#GIS #spatial #mapping #humour #humor #datums #coordinatesystems #NAD83 #NAVD88 #mappymeme #survey #USGS #NGS #benchmark #surveymarker #NorthAmerica #geodetic #geodesy
@XKCD
The NSRS Horizontal Datums Will Be Tectonic Plate Based! | Changes To The Vertical Datums
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https://geodesy.noaa.gov/datums/newdatums/index.shtml <-- details of the new NSRS datums, etc at the National Geodetic Survey (NGS) website
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#GIS #spatial #mapping #coordinates #coordinatesystems #NationalGeodeticSurvey #NGS #datums #verticaldatum #NorthAmerica #horizontaldatum #NSRS #geology #NorthAmericanPlate #CaribbeanPlate #tectonics #platetectonics #movement #GPS #GNSS #geomorphometry #NAVD88 #NAD83 #accuracy #precision
Talk I gave in FOSS4G 2023: "Introduction to Coordinate Systems" https://www.youtube.com/watch?v=4OOGVIajt9Y
Now with the proper subtitles! (Google was not very good with the autogenerated ones).
The slides in PDF are available in my web page.
#FOSS4G #foss4g2023 #GIS #coordinatesystems
Since I use Coordinate Reference Systems on a daily basis I have to search them for different reasons (usually because a customer is using the wrong one). I decided to develop a webpage to search them quickly, and get useful information. A few months later we moved it into the PROJ.org domain.
You have it at https://crs-explorer.proj.org/
Now there is not a single day I do not use it. It was worth it the investment.
Dive into the world of #maps and data on #GISDay2023, with
@unigis_salzburg! 🌍✨
💡 Join us for an insightful talk on "#Projections and #CoordinateSystems in #GIS".
💻 November 15th, 4-4:30pm CET, online
🔗Expand your knowledge with #UNIGIS and register now: https://attendee.gotowebinar.com/register/2686645001996127321?source=mastodon
#Geoinformatics #GIS #geoinformatik #MasterofScience #fernstudium #distancelearning
The Armed Forces of #Ukraine switch to the WGS-84 world coordinate system, commonly used by #NATO countries, instead of the Soviet SK-42, which is accurate only for the territory of the former #USSR.
Establishing #coordinatesystems of the Alliance will improve the compatibility of troops and ensure the exchange of data between the Ukrainian army and other states. With the transition to #WGS-84 maps will become more accurate since SK-42 was based on a different mathematical model of the #Earth.
