GELE study guide
GELE · Work through your exam, one topic at a time.
The Geodetic Engineer Licensure Examination (GELE) is the Philippine professional board examination that a candidate must pass before being registered as a licensed geodetic engineer and before lawfully signing and sealing survey plans, geodetic control descriptions, and related land and mapping documents. It is intended for graduates of a geodetic engineering program (or an equivalent qualification recognised by the Professional Regulation Commission) who are preparing to enter practice in government land agencies, private survey and consultancy firms, utilities, construction, mapping and GIS units, or their own practice. The GELE study guide has 6 sections and about 1,838 words.
01Geodesy and Geodetic Surveying
Geodetic work rests on distinguishing the topographic surface , the geoid (an equipotential surface approximating mean sea level, continued under the continents) and the reference ellipsoid . Ellipsoidal height h relates to orthometric height H through h = H + N, where N is the geoid undulation.
334 words, about 2 min02Cadastral Surveying and Land/Property Law Applications
Philippine land registration follows the Torrens system under the Property Registration Decree (PD 1529): a certificate of title (OCT/TCT) is indefeasible and conclusive evidence of ownership. Original registration may be judicial or administrative, the latter through free patents and homestead patents under the Public Land Act (CA 141).
299 words, about 1 min03Survey Computations, Adjustments, and Least Squares
Latitude = d cos(azimuth), departure = d sin(azimuth). Summing a closed traverse gives the closures in latitude and departure, from which linear misclosure and the relative precision (1:N) are computed before any adjustment.
298 words, about 1 min04Cartography, Mapping, and Geographic Information Systems
Map scale is a representative fraction: 1:10 000 is a large scale (small ground area, much detail), 1:250 000 is a small scale. The working accuracy standard is 0.5 mm at map scale, so a 1:50 000 map supports about 25 m positional accuracy.
279 words, about 1 min05Engineering Mathematics, Basic Sciences, and Survey Instrumentation
Expect plane and spherical trigonometry, coordinate geometry (bearing and distance between points, line intersection, area by coordinates), and basic error statistics: mean, standard deviation, standard error of the mean, and the most probable value as the weighted mean with weights inversely proportional to variance. Unit fluency matters: 1 hectare = 10 000 m squared, 1 acre = 4 046.86 m squared, 1 grad = 0.9 degree, 1 mil = 0.05625 degree, and a radian = 206 265 seconds.
321 words, about 2 min06Photogrammetry and Remote Sensing
For a vertical photograph the scale is S = f / H, where f is the focal length and H the flying height above the ground (or above mean terrain), giving a representative fraction such as 1:25 000. Flying height above the datum must be reduced by the terrain elevation first.
307 words, about 2 min