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Hello i,am Abdulhadi alzawi from Libya


I would like to share with you our celebration of World GIS Day yesterday from Libya in the municipality of Tripoli Center
There was a presentation talking about GIS and its importance in private and public institutions and a view of the layers that were created and the data were entered and we also talked about sharing this data and layers through the web portal for the public to see .
There was also a map gallery for some areas within the municipal boundaries .
The attendees were members of the municipal council, the dean of the municipality, some employees and guests from outside the municipality

We’re excited to celebrate GIS Day 2018 with you here on GeoNet! Join in the worldwide geo-festivities and let us know how you’re celebrating this year by sharing your GIS Day stories and experiences (pictures, videos, comments or links to other content) and answering one of the questions below.  


  • How have you helped others learn about and apply GIS in their work or lives this year?
  • What personal GIS projects are you most proud of?
  • What areas GIS would you like to explore more this year? What GIS skills would you like to improve in?
  • What is one way you’d like to see GIS change the world?


--Joseph Kerski 

Spelling GIS Day on the beach!

 Spelling GIS Day in the sand on a beach!

GIS Day in the Classroom: An Implementation Guide for GIS Professionals and Teachers.  This resource is filled with activities and strategies that you can use on GIS Day and far beyond, to enable educators and students to effectively use GIS in a wide variety of subjects and levels of education:

The Delaware GIS Day event is a great example of collaboration among different organizations to celebrate and educate about the value that GIS brings to education and society.  The Delaware event will be held on Wednesday, November 14, 2018 at the Air Command Mobility Museum in Dover. Approximately 300 students plus the general public attend this event from around the state, traveling through 18 stations to learn how GIS is used in different industries. There is even an enormous Earth balloon!  The content of these stations is tied to the 5th grade state curriculum.  Delaware Geographic Data Committee partners with several organizations to host this event.  They have even created a wonderfully detailed story map, here.  


For more information, see the event website:   


If you are looking for ideas for your own GIS Day event, I invite you to examine the plans that Delaware has, and be encouraged and inspired!

Delaware GIS Day story map

The first section of the wonderfully detailed Delaware GIS Day story map.

GIS Day 2017 – Certification Voucher Giveaway


The certification team is kicking off GIS Day in a major way.


As part of the GIS Day festivities, we are sponsoring our annual Esri Technical Certification giveaway where you can enter to win a free exam voucher (valued at $225). Whether you are a student just starting out with GIS or a working GIS professional, achieving a technical certification lets everyone know that you are accomplished using Esri software.


We offer a variety of exams at different levels and versions of AcgGIS.  And, this giveaway is a great opportunity to take the next step in achieving your personal and professional development goals.


Visit our certification giveaway website to enter the contest.


*Only one entry per person.  Four entries will be randomly selected for the free vouchers.  The contest is open from November 14th through November 24th.  Contact for complete rules.


Good Luck!!


esricert technical certification esri technical certification

Jessi Mielke Jessica Rosales Suzanne Boden

GIS Day is drawing near!  This year, it will be held on 15 November 2017.  I wanted to share 6 things about GIS Day with you.


  1. What is GIS Day?  The theme of GIS Day is "Discovering the World Through GIS".  GIS Day provides an international forum for users of geographic information systems (GIS) technology to demonstrate real-world applications that are making a difference in our society.  The first formal GIS Day took place in 1999. Esri president and co-founder Jack Dangermond credits Ralph Nader with being the person who inspired the creation of GIS Day. He considered GIS Day a good initiative for people to learn about geography and the uses of GIS. He wanted GIS Day to be a grassroots effort and open to everyone to participate.

  2. Host an event at your organization -- school, community or technical college, university, nonprofit organization, library, private company, government agency, or even in a park outside--sometime during or close to GIS Day week (15 November 2017).  Post an announcement about your event on  It doesn’t have to be elaborate or something that consumes a lot of your employees’ time, but something where you open a section of your organization to the community, other departments in your organizations, or local schools, universities, community colleges, and clubs, to showcase what GIS is and what you are doing to make a positive difference in the world using GIS.  It doesn’t have to even be on the actual GIS Day; the point is that your event is promoting the benefits GIS brings to communities, your organization, and society.  Or, look at the map on the GIS Day website to find an event near you that you can attend!

  3. Find resources on the website  Together with a few other good people at Esri, I have made about 75 changes to the website since last GIS Day.  The resources improved on the website include story maps, hands-on activities, videos, strategies on how to work with students and the general public, and much more. Stay tuned for updates of the press releases, and so on.
  4. Get some geo-swag!  The first 250 organizations that register for GIS Day this year around the world will receive 1 box of some wonderful GIS-related items that you can use for promoting your event.  
  5. Be a GIS champion!  I am seeking organizations who are GIS and GIS Day champions around the world to highlight the good things they are doing, to be featured in articles on GeoNetArcNews, and other outlets.  Videos too!  If you know of an organization that should be included, or think that yours should be, please let me know via
  6. Questions?  Please email  I am on the receiving end of those emails and respond to these on a daily basis.


I hope this is helpful.  Thank you for promoting and supporting GIS Day!


--Joseph Kerski 



I am working on ArcGIS 10.1 and currently doing XY co-ordinate conversion to Long/Lati for Mayotte.

As per my knowledge, PE_GT_COMBANI_1950_TO_WGS_1984_1 will be used. However when ever i used this parameter, all data stream rejected.


I am using below function code



PE_GEOGTRAN       combani_to_wgs84 = pe_factory(PE_GT_COMBANI_1950_TO_WGS_1984_1);

    l_rc = pe_proj_to_geog(combani_to_wgs84 ,1,point);


however when i used below code then it works , however i am getting wrong Long/Lati for Mayotte.


  char * pcs_reunion = "PROJCS[\"Gauss_Laborde_Réunion\",GEOGCS[\"GCS_Piton_des_Neiges\",DATUM[\"D_Piton_des_Neiges\",SPHEROID[\"International_1924\",6378388.0,297.0]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",160000.0],PARAMETER[\"False_Northing\",50000.0],PARAMETER[\"Central_Meridian\",55.53333333333335],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",-21.11666666666667],UNIT[\"Meter\",1.0]]";

  ntf_proj_reunion = pe_projcs_from_string(pcs_reunion);



l_rc = pe_proj_to_geog(ntf_proj_reunion,1,point);


Function pe_proj_to_geog used by me is correct?


Thanks to guide me to resolve this issue.