From the Operations Manual:
7.16.3.1 Procedure for election of candidates by the GRSS members
The Nominations Committee shall submit to the Administrative Committee at least one name of a member of the Society for each vacancy to occur in the Administrative Committee for terms expiring December 31. In addition, the Chair of the Nominations Committee shall ensure that a Call for Nominations is published in the January issue of the GRSS eNewsletter, and in the GRSS web site, with deadline for submitting applications set to February 28.
All candidates who submitted an application may be supported by the membership through an ad-hoc petition page in the GRSS web site, accessible to the general membership from March 15 to April 30. A petition carrying a minimum of 2% of the names of eligible Society members, excluding students, place that nominee in the slate. If more than 6 candidates are supported by at least 2% of the membership, only the 6 names with the largest support will be selected.
The Nomination Committee shall be guided in the selection of the remaining names in the slate by the number of supporting members, the principles of demonstrated or potential ability in GRSS-related activities, and by other factors which may be relevant, such as geographical distribution, gender diversity, and the academic, governmental, and industrial distribution of the candidates.
If a current AdCom member has 12 consecutive years of service as an elected member of the AdCom, that person cannot be placed on the election ballot by the Nominations Committee.
After submission of the slate of candidates by the nominations committee to the IEEE, the election is conducted by IEEE in electronic format and in form paper ballot. Three candidates receiving the greatest number of votes shall be elected.
More information is available here
The tool is available at http://nt.grss-ieee.org/. The tool is open for self-nomination to serve in the AdCom for the years 2020-2022 from January 14, 2019 at 00:00 PST to February 28, 2019 at 23:59 PST.