Guidelines for the use of GNSS in surveying and mapping

More documents

Recommendations

Info

Virtual RINEX Network RTK systems can be employed to apply network correction information to the raw GNSS data to create Virtual RINEX observation files for locations anywhere within a GNSS network. The advantage of this is that during post-processing, baseline lengths between base station and rover are kept to a minimum, enabling greater accuracy. WGS 84 World Geodetic System (1984) The geocentric datum used by GNSS since January 1987. It has its own reference ellipsoid. WGS 84 is fully defined in publications by the US. National Imagery and Mapping Agency (NIMA). Wide lane A linear combination of L1 and L2 observations (L1–L2) used to partially remove ionospheric errors. This combination yields a solution in about onethird the time of a complete ionosphere-free solution. Z-count The GNSS satellite clock time at the leading edge of the next data sub-frame of the transmitted GNSS message (usually expressed as an integer multiple of six seconds). Zero baseline Collection of data by two or more receivers from the same antenna. Any relative baseline thus computed should be zero. It is used to check receivers at the start of tasks. (Warning: to avoid damage to the antenna, a special zero baseline DC block should be used.) GUIDELINES FOR THE USE OF GNSS IN LAND SURVEYING AND MAPPING |73
Checklists for GNSS survey specification and procedures This page can be photocopied to assist in preparation of survey specifications and procedures. The client and surveyor should compile the information required for their respective sections, but also note the items contained in the other’s checklist. Client checklist The appropriate RICS client specification guidelines can be used to write the overall survey specification. The following table can be used in addition, to ensure that specific GNSS related issues are addressed in the survey specification. It is likely that many surveying or mapping projects will include GPS as an element of the fieldwork and it is good practice to include GNSS survey guidelines for the surveyor within the specification at the outset. GNSS related item to include in specification Additional information Check Co-ordinate system requirements Part 1 Section 3.4 Part 2 Section 6 Final survey accuracy in plan and height Part 1 Section 1.3 Part 2 Sections 4.2, 4.3, 4.4 Number and type of survey control points required Part 1 Section 1.2 GNSS survey type (control/detail/positioning) Part 1 Section 1.2 GNSS products required Part 1 Section 3.5 GNSS survey method preferred (optional) Part 1 Section 1.3 Part 2 Section 4 GNSS equipment and software listing (optional) Part 1 Section 3.5 74 | GUIDELINES FOR THE USE OF GNSS IN LAND SURVEYING AND MAPPING
Page 1 and 2:
GN 13/2010 RICS Practice Standards,
Page 3 and 4:
Published by the Royal Institution
Page 5 and 6:
Appendices 59 A GNSS verification,
Page 7 and 8:
Preface This second edition of the
Page 9 and 10:
Part 1 - Guidelines 1 The role of G
Page 11 and 12:
applications which are unsuitable f
Page 13 and 14:
Table A: Control survey guidelines
Page 15 and 16:
Table C: Positioning guidelines Gui
Page 17 and 18:
Table D2: Survey methods - dynamic
Page 19 and 20:
Table D3: Survey methods - dynamic
Page 21 and 22:
2.2 Surveyor’s procedures The sur
Page 23 and 24:
Table F: Planning Guideline Explana
Page 25 and 26:
Table H: Data processing Guideline
Page 27 and 28: Table 3.5: Reporting Guideline Expl
Page 29 and 30: Table K1: Atmospheric refraction -
Page 31 and 32: Table K3: Interference Consideratio
Page 33 and 34: Part2-Technical commentary 4 GNSS s
Page 35 and 36: Although these observables have dif
Page 37 and 38: Historically, single-frequency stat
Page 39 and 40: 4.4 Real-time dynamic surveys With
Page 41 and 42: 5 Operational considerations Sectio
Page 43 and 44: Errors in the troposphere which are
Page 45 and 46: In addition, phase centre variation
Page 47 and 48: 6 Co-ordinate reference frames or s
Page 49 and 50: particular country’s geodetic ref
Page 51 and 52: 6.3.2 Transformations from ITRS89 e
Page 53 and 54: 6.3.5 Co-ordinate transformation is
Page 55 and 56: eceivers are observing at the same
Page 57 and 58: The field procedures adopted should
Page 59 and 60: 7.4.4 System initialisation Operati
Page 61 and 62: aw data. Advanced processing strate
Page 63 and 64: values with their computed precisio
Page 65 and 66: Appendix B: Information on receiver
Page 67 and 68: The following general information s
Page 69 and 70: Appendix E: Sample procedures relat
Page 71 and 72: tracking had been maintained. The i
Page 73 and 74: GPS (Global Positioning System) The
Page 75 and 76: or as the corrections that would be
Page 77: Simultaneous measurements Measureme
Page 81 and 82: 76 | GUIDELINES FOR THE USE OF GNSS
show all

Guidelines for the use of GNSS in surveying and mapping

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?