One of the biggest challenges in the development and use of large-scale land information systems is that of combining GIS with surveying principles, interests, and professional activities. The Geographic and Land Information Society brings together the two professions so as to ensure the integrity and reliability of the data and the resultant uses of large-scale land information systems. GLIS is dedicated to encouraging the appropriate use of surveying and mapping technologies in the development and use of geographic and land information systems. GLIS shares a common goal with the ESRI Surveying-Special Interest Group (S-SIG) to work to strengthen the synergy between the GIS and land surveying professions. At the international scene, GLIS is involved in the work of FIG, the International Federation of Surveyors, through the ACSM - FIG Forum.