Seisland

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Field Mapping

Are you looking to map the physical characteristics of a new area, or do you need quick answers about what’s in an area where you’re already active? Seisland employs highly-skilled field mappers who can access virtually any terrain and use industry-leading technology to create high-quality field culture maps for seismic surveys, construction, as well as power-line and underground utility locating. From the moment the crews arrive on-site to map delivery, we are fully digitized – including offering an industry-leading online access service, TriliGIS.

The goals of seismic surveying and field mapping are to position and plot the locations of the receiver stations (geophones) and source points, plus all other important features and hazards such as pipelines and power-lines, fences and gates, roads and trails, properties, buildings, wells and water sources. The work includes identifying exclusion zones – areas where source and receiver points are not permitted – such as water bodies or close proximity to pipelines.

Seisland’s approach to field mapping is to create the hazard assessment and field culture map first! We never try to make our surveyors map while they survey. Why? Because having a map already in hand is safer and more efficient for the surveyors. It helps prevent trespassing. And it gives you, the client, more control over redesigning your seismic program at the field level.

Think about this: by identifying and mapping hazards, exclusion zones (where source and receiver points are not permitted) and field culture first, our surveyors aren’t just moving these points based on general skidding guidelines in complicated areas. Rather, our mapping team will have identified them ahead of time, with appropriate exclusion zones mapped so that you, the client, can remodel these points and select optimal locations. The survey team will then have their tasks properly defined, removing a source of miscommunication about the job to be done.

Seisland’s numerous surveys, stretching over many years, have demonstrated that mapping first is effective and efficient for the client and the survey contractor. Among other benefits, it can reduce the remodelling time, thus greatly reducing remodelling charges. Ultimately, the client has more control over source and receiver point locations and, therefore, will end up with a superior final product.

Other important information about Seisland’s field mapping services:

  • We are equally able to conduct surveys in “white areas” – agricultural or otherwise developed land, usually privately owned – and “green areas”, or forested land, more commonly Crown-owned;
  • Seisland’s field mappers start by using internally generated base maps, comprised of orthophotos, government topographic datasets and other vendor reference data, to build upon with field culture. To ensure efficiency in the field, we use the latest mapping programs such as ESRI, OziExplorer and Mapwel software, along with the appropriate components of the following data: digital topographic, orthophoto or satellite imagery, government digital elevation models (DEM) or LiDAR data – bare earth, vegetation height or full feature;
  • Base maps are augmented by the data collected in the field including hazards and the features described above, resulting in custom field culture maps. We can then plan the optimal line locations for the seismic program;
  • We use Trimble GEOXH handheld GNSS units, along with ESRI’s GPS Analyst extension, to position and plot critical obstacles (buried utilities, wells, buildings and power lines) to sub-metre accuracy, as well as for less critical features such as fences, gates and trails;
  • Seisland uses the latest computer systems and high-quality large-format plotters to create high-quality maps at the field level. Updated digital data and field hazard/culture maps are sent to the client and their geophysical/operational personnel daily. This gives the client early insight into actual field culture and conditions, providing the opportunity to optimize the seismic coverage prior to or during the survey phase; and
  • In the advancing phase, Seisland’s advance crews employ highly skilled Mapping Coordinators and line pushes. They carefully scout the program in order to optimally position the seismic lines, building the routes and creating maps for the GPS units used by the line-cutting equipment or line slashers. Our personnel are responsible for the crew supervision and safety of the client’s third-party line-cutting crew. Being able to create maps from proper advance planning information, prior to any line-cutting, delivers an efficient and safe field operation.