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Group Settlement Survey (Gss) /Townsite Subdivision Survey (Ts)

Chapter III - Isolated Surveys

Article 7 Group Settlement Survey (Gss) /Townsite Subdivision Survey (Ts)

Section 116. Gss and Ts Surveys Projects as defined in Section 6(a), DAO No. 2007-29, shall be conducted in the PRS92 system and shall follow the accuracy requirement stated in Section 28 (b), DAO No. 2007-29. The conduct of GSS and TS survey shall be governed by the following:

a. Determination of position of the lot’s boundary from an established reference point shall be conducted using:

1. GNSS Observations, if the area is at least 1,500 hectares

2. ETS Observation for Traverse, Triangulation, or trilateration from established PRS92, if the area is below 1,500 hectares. However, the Geodetic Engineer concerned shall have the option to use GNSS receivers.

b. Lot Corners shall be determined by side shot using conventional instruments with the minimum specification as follows:

1. If area is at least 1,500 hectares: ETS

2. If area is 500 to 1,500 hectares: One-second (1”) optical or electronic (digital) theodolite with EDM for distance determination

3. If area is 10 to 500 hectares: Six-second (6”) optical or electronic (digital) theodolite with EDM for distance determination

4. If area is 5 to 10 hectares: Twenty-second (20”) engineer’s transit with 100-meter steel tape for measuring distance.

5. If area is less than 5 hectares: Thirty-second (30˚) engineer’s transit with 50-meter steel tape for measuring distance.

Instruments of higher precision and longer length or range than the one specified above for corresponding area of lots may be used in the conduct of survey (e.g. for 5 to 10 hectares, a 6” optical or digital theodolite and EDM may be used). In all cases, all survey instruments should have undergone the testing/calibration and registration prior to their use as required under Section 22, DAO No. 2007-29.

Section 117. Pursuant to Section 15, DAO No. 2007-29, Geodetic Engineers shall undertake Gss or Ts survey only upon receipt of authority issued by the concerned DENR Officials stated in the Section 16, DAO 2007-29. The conditions as mentioned in Section 19, DAO No. 2007-29 shall be imposed in the granting of survey authority.

However, if the land is within the jurisdiction of a certain government agency by virtue of an existing law, Section 17, DAO No. 2007-29 shall apply.

Section 118. Data Research of Adjoining Claims – The Geodetic Engineer shall conduct research on the lot and the adjoining lots if they are covered by approved survey, surveys filed for registration and their corresponding status whether decreed, pending, dismissed, etc.

Data of reference points of established Geodetic Control and Project Control Network adjacent to or within the vicinity area preferably one kilometer or less in consonance with Section 91.e of this Manual, shall be researched, collated and evaluated.

Thereafter, verify their individual status on the ground to ascertain whether the monuments set on the ground are intact/undisturbed. Their corresponding Geographic Position and Plane Coordinates (GPPC), both in the Local and in the Philippine Plane Coordinate System (PPCS), shall also be determined. Only stable or undisturbed control or reference points shall be considered in the establishment of control around the lot to be surveyed. Moreover, PRS92-control points established in the area as validated and approved by NAMRIA shall also be determined and shall be included in the list of reference points to be considered. Based on the researched data, a preliminary sketch of the lot shall be made and the names of the adjoining owners shall be indicated therein.

Section 119. Before the conduct of survey, a reconnaissance and validation of sketch of the tract of land to be surveyed shall be made. The names and addresses of all persons claiming ownership of a part of the entire tract to be surveyed and of adjoining lands shall be indicated therein.

Section 120. Notification for this survey shall follow those stated in Section 7 of this Manual.

Section 121. Organization of the Survey Party – The composition of the survey party and its manpower complement shall be as determined by the Chief of Party provided that they are qualified to serve as such under this Manual.

The Lot Survey Team may be divided into sub-group which shall handle major activities such as sketching (with BAP and PIS activities), manufacturing and setting of monuments, control establishment and lot survey. For a small area and non-project survey, the conduct of control and lot survey may be done by a single team.

Section 122. Isolated Survey Accuracy – The conduct of isolated survey shall be done in accordance with the accuracy requirement for Tertiary Control as stated in Section 28.b.1, DAO No. 2007-29. Provided that, the length of side shots from the traverse station to the lot corners shall not exceed 500 meters when using ETS or EDM and 100 meters when using steel tapes.

Section 123. Boundary Agreement Process (BAP) and Parcel Information Sheet (PIS) – The conduct of BAP and formalizing the agreement through the PIS pursuant to Section 85 of this Manual shall be done before the monument setting of lot corners.

The adjudicator shall be an LMO assigned by the DENR, who shall, together with the Chief of Party and the Barangay representative, stand as witness to the agreement.

They shall affix their signatures on the PIS.

The sketching of the lot, adjoining properties, public works and the natural features shall follow the pertinent provisions of Sections 81 to 85 of this Manual.

Section 124. Lot Corners Monument Setting – The corners of the lot shall be marked with monuments based on the result of BAP as sketched and agreed upon in the PIS of all concerned parties pursuant to Sections 87 to 89 of this Manual.

Section 125. Conduct of Lot Survey – The survey for the determination of point of reference and the lot corners shall be in accordance with the accuracy requirements stated in Section 28.b.1, DAO 2007-29.

Setting the Permanent Position of Lot Corners

Section 126. Tie Lines – A tie line shall be a straight line with known bearing and distance expressed in degrees, minutes and seconds computed based on the position of corner 1 of the lot from an established reference monument. The following shall be the procedures and conditions in the establishment of tie lines:

a. Tracts to be surveyed shall be tied by a closed traverse to the nearest points of reference as provided for in Section 34, DAO 2007-29.

b. However, corner-markers of an approved survey, may be used as reference, provided that a common point pursuant to Section 128 of this Manual can be established from at least three (3) available corner-markers which could be relied upon as to their permanency and stability.

c. In case no corner markers of an approved/decreed/patented survey can be found on the ground, at least three (3) corner-markers of nearby approved/decreed/patented survey may be used as reference provided a common point can be established pursuant to Section 128 of this Manual.

Section 127. Connection of Surveys - All surveys shall be adequately connected to existing surveys, or the position of the survey shall be determined by a method that will enable the survey to be shown in relation to existing surveys taking into consideration the accuracy appropriate to the circumstances. The survey shall be adequately connected to permanent reference points existing in close proximity to the survey.

Section 128. Common Point - When a previous survey and the survey in progress overlap or adjoin each other, a common point shall be selected from among the corners which have been located.

a. The selection of the corner to be adopted as a common point shall depend on the following:

1. The permanency of the corner monument of an approved survey as verified on the ground.

2. The degree of precision between the computed positions of the corner monuments as found in place on the ground determined from the data of the approved surveys and of the survey in progress.

3. In general, a living tree, a boulder or any other object of permanent nature used as corner in the approved survey, which is identified beyond doubt in the course of the survey in progress and which is not likely to have been removed from its original place, shall be selected as a common point in preference to concrete stone or other monuments which may, with comparative ease, be removed from their original location and be placed elsewhere.

b. When monuments of approved surveys appear to have been moved, such observation shall be recorded in the field notes and the subject monuments shall be reinstated/re-established. Should the monuments have been determined to be fixed/undisturbed as to their location on the ground, they may be used as witness monuments to the true corners.

c. When the position of a corner of an approved survey and its position as determined in a latter survey is within the allowable position of error as

provided for in Section 30.b, DAO No. 2007-29, the position as determined in the earlier survey shall be accepted and adopted as the position of such corner in the latter survey.

d. When the discrepancy in position exceeds the limits set forth in the preceding section, the geodetic engineer shall make such verification as may be necessary to check the data of the survey in question. A complete report on the discrepancies and the results of verification shall be made and submitted to the concerned Regional Technical Director for Lands, through the Regional Chief of Surveys Division for decision.

e. If the recovered corner of the previous survey is not identical to its description in the plan, investigation shall be conducted by the geodetic engineer to ascertain the cause thereof and the result of the investigation shall be reported in writing to the concerned Regional Technical Director for Lands.