ATP-3-09-02 Field Artillery Survey Download

Chapter 4 4-2 ATP 3-09.02 16 February 2016 performed. This information will include descriptions of the starting and closing stations, a description of any principal station established, the area or locality in which the work is performed, the purpose of the survey, and general remarks on weather, terrain, or other conditions that may be factors in evaluating the results. The information in the field notes must be complete enough that anyone not familiar with that particular survey operation can take the notebook, return to the locality, and recover or reconstruct any portion of the survey. 4-3. Data are recorded in the field notebook in tabulated columns according to a prescribed plan. Enough spaces are provided to permit entry of mean values as they are determined by the recorder. 4-4. Sketches must be made when needed. For example, if the description of an SCP in the trigonometric list is vague, incorrect, or missing or if maps of the area contain errors, a sketch is required. Each sketch should be drawn to an approximate scale and include a grid north (GN) line. Important details of the sketch may be exaggerated for clarity. Sketches should show distances to at least two reference marks from any principal station that might be buried underground. Reference marks should be permanent in nature. If permanent reference marks are not available, the survey party should emplace semi-permanent marks. Sketches also are used when necessary to indicate heights of survey signals and other points when vertical angles are observed to other than instrument height. A small protractor, which can also be used as a straightedge, should be used as an aid in making sketches. Each sketch should be legible and should be drawn large enough to ensure that it can be understood. Each station shown on the sketch should be identified. 4-5. A description should be used to supplement the information shown in the sketch. Remarks may be made to clarify measurements, weather, terrain, and observing conditions. The remarks should include any other factors that might be of any value in the evaluation of the survey. Approved abbreviations and conventional symbols will be used on sketches and in descriptions. RECORDING 4-6. Each numbered page of the field notebook provides space for recording information pertinent to the survey. The type of survey and the date are entered at the top of the left side of the page. Weather conditions (two variables that identify visibility and temperature), the type and serial number of the instrument, and the names of the party personnel are entered across the top of the right side of the first page of each survey. The rest of the pages are used for recording survey data (instrument readings, mean angles, and distances) for designating the survey stations; for recording telescope positions or number of repetitions measured; and for recording remarks, sketches, and descriptions. The team chief will check data entered on each page and initial each numbered page before leaving the field. (If an incorrect angle or distance is discovered, it can be re-measured before the party leaves the area.) The instrument operator also should check recorded values for each occupied station before taking down the instrument. 4-7. All entries in the field notebook will be printed in capital block letters and in a neat and legible manner. Always use a sharpened pencil with lead soft enough to be readily seen but hard enough to be smear proof (3H or harder). Entries will never be made in ink. The recorder goes with the instrument operator and records the data in the field notebook as they are announced to him. He then reads data back to the instrument operator to ensure his entry is correct. Field data entries are recorded directly in the field notebook and not on scraps of paper for later transfer. As the entries are made, the recorder computes and records mean values and, for ease of identification, encircles the data that will be used to compute the survey. The recorder will immediately notify the instrument operator of any incorrect angle before the instrument is moved from the station. Station descriptions, sketches, and remarks are entered in the notebook before the survey party moves to the next station and must be complete enough to permit reestablishment. Only the data for that specific survey will be recorded on the page. Data pertaining to surveys other than the one in progress will be recorded on other pages. 4-8. Erasures are not permitted in the field notebook. If an incorrect entry is made, it is corrected by drawing a single line through the incorrect data and entering the correct data directly above the incorrect data. When a page is filled with data, sketches, or remarks that will not be used because of a change in plans, the page is crossed out by drawing diagonal lines between opposite corners of each side of the page and printing the word VOID in large letters across each side of the page (see figure 4-2 on page 4-4).