--- title: Tie Lines Can Be Used For More Than Constraining Magnetic Data description: When analyzing geophysical data use tie lines for more than just levelling the magnetic data. Tie lines can also be used to evaluate the regional gradient. image: https://www.rmgeoscience.com/hubfs/BLOG%20IMAGES/TieLines/TieLine3.jpg.png --- [![](https://www.rmgeoscience.com/hubfs/canada-flag-en.png)  ](https://www.rmgeoscience.com/) [![](https://www.rmgeoscience.com/hubfs/canada-flag-fr.png)  ](https://www.rmgeoscience.com/) [![](https://www.rmgeoscience.com/hubfs/german-flag.png) ](https://www.rmgeoscience.com/) [![](https://www.rmgeoscience.com/hs-fs/hubfs/spanish-flag.jpg?width=30&height=15&name=spanish-flag.jpg "spanish-flag.jpg")](https://www.rmgeoscience.com/)   [(705) 419 - 1508](tel:+7054191508) [![Ronacher McKenzie Geoscience](https://www.rmgeoscience.com/hs-fs/hubfs/RMGeo%20Theme%202017/Images/Logo/RMGEO-logo-web.png?width=160&height=51&name=RMGEO-logo-web.png "Ronacher McKenzie Geoscience")](https://www.rmgeoscience.com) - About - [Our Team](https://www.rmgeoscience.com/team-members-experience-qualifications-geologist-geophysicist) - [Methodology](https://www.rmgeoscience.com/geoscience-geophysical-consulting-methodology-how-we-work-exploration-client-services) - [Who We Work With](https://www.rmgeoscience.com/ronacher-mckenzie-geoscience-clients) - [Project Photos](https://www.rmgeoscience.com/photographs-gallery-exploration-mining-projects) - [Careers](https://www.rmgeoscience.com/geoscience-engineering-careers-jobs-canada) - [Resources](https://www.rmgeoscience.com/geoscience-resources) - Consulting Services - [Data Integration, Analysis and Interpretation](https://www.rmgeoscience.com/data-integration-geology-geophysics-geochemistry-2d-3d-modeling) - [Geophysical Services](https://www.rmgeoscience.com/geophysical-services-surveys-rock-analysis-qa-qc-interpretation) - [Project Generation and Property Assessment](https://www.rmgeoscience.com/mineral-project-generation-property-assessment-for-investors) - [Exploration Project Management](https://www.rmgeoscience.com/exploration-project-management-consulting-field-programs) - [Technical Reports](https://www.rmgeoscience.com/geology-geophysical-technical-reports-for-exploration-mining) - [Lands Management](https://www.rmgeoscience.com/lands-management-geoscience-resource-consulting-services) - [Machine Learning](https://www.rmgeoscience.com/machine-learning-in-exploration) - [News](https://www.rmgeoscience.com/news-and-events) - [Blog](https://www.rmgeoscience.com/blog) - [Contact](https://www.rmgeoscience.com/contact-geologists-geophysicists-field-geology-consultants) ## Perspectives Geoscience Blog ## [Tie Lines Can Be Used For More Than Constraining Magnetic Data](https://www.rmgeoscience.com/blog/tie-lines-can-be-used-for-more-than-constraining-magnetic-data) ** Jun 9, 2017 4:26:06 PM / by [Brenda Sharp](https://www.rmgeoscience.com/blog/author/brenda-sharp) - [Tweet](https://twitter.com/share) Tie lines or Control lines have always been used for the levelling of magnetic data, but essentially ignored with respect to other geophysical methods. How about using them, not in the traditional sense, but as a guideline to the overall sense of the regional gradient of a survey? Although the examples to follow are EM, this can equally be applied to other methods. The image below, is a grid from a TDEM dataset. Let's look at the circle region. It seems near the southern survey boundary that there is a small levelling issue. ![Geophysical Magnetic Data Survey Image](https://www.rmgeoscience.com/hs-fs/hubfs/BLOG%20IMAGES/TieLines/TieLine1a.jpg?width=766&name=TieLine1a.jpg "Geophysical Magnetic Data Survey Image")   When we examine the tie line, there is no indicator of an offset. ![Analysis of Geophysical Tie Line](https://www.rmgeoscience.com/hs-fs/hubfs/BLOG%20IMAGES/TieLines/TieLine2.jpg?width=766&name=TieLine2.jpg "Analysis of Geophysical Tie Line")   And on this dataset below, the lines and tie lines should be examined to determine if the conductivity really does drop suddenly south of the dashed line, or whether it is caused by questionable levelling. ![Geophysical Survey Image](https://www.rmgeoscience.com/hs-fs/hubfs/BLOG%20IMAGES/TieLines/TieLine3.jpg.png?width=766&name=TieLine3.jpg.png "Geophysical Survey Image")   The bottom line - use all the tools (in this case tie lines) at your disposal, to better understand your survey data. If you need help with geophysical analysis, [get in touch with us](https://www.rmgeoscience.com/contact-geologists-geophysicists-field-geology-consultants). We'd be pleased to hear about your project, and will recommend services and support to help you achieve quality results.     Topics: [Integrated Geophysical Analysis](https://www.rmgeoscience.com/blog/topic/integrated-geophysical-analysis) ![Brenda Sharp](https://app.hubspot.com/settings/avatar/d41d8cd98f00b204e9800998ecf8427e "Brenda Sharp") #### Written by [Brenda Sharp](https://www.rmgeoscience.com/blog/author/brenda-sharp) ### Subscribe to Email Updates ### Posts by Topic - [Speaking Engagements (6)](https://www.rmgeoscience.com/blog/topic/speaking-engagements) - [3D Modelling (4)](https://www.rmgeoscience.com/blog/topic/3d-modelling) - [Integrated Geophysical Analysis (4)](https://www.rmgeoscience.com/blog/topic/integrated-geophysical-analysis) - [Meet The Team (4)](https://www.rmgeoscience.com/blog/topic/meet-the-team) - [Field Projects (3)](https://www.rmgeoscience.com/blog/topic/field-projects) - [Industry Events (3)](https://www.rmgeoscience.com/blog/topic/industry-events) - [Industry Contributions (2)](https://www.rmgeoscience.com/blog/topic/industry-contributions) - [Lands Management (2)](https://www.rmgeoscience.com/blog/topic/lands-management) - [43-101 (1)](https://www.rmgeoscience.com/blog/topic/43-101) - [Diversity (1)](https://www.rmgeoscience.com/blog/topic/diversity) - [Drill Programs (1)](https://www.rmgeoscience.com/blog/topic/drill-programs) - [Geology (1)](https://www.rmgeoscience.com/blog/topic/geology) - [Geophysical Surveys (1)](https://www.rmgeoscience.com/blog/topic/geophysical-surveys) - [Geophysicist (1)](https://www.rmgeoscience.com/blog/topic/geophysicist) - [Geophysics (1)](https://www.rmgeoscience.com/blog/topic/geophysics) - [Inclusivity (1)](https://www.rmgeoscience.com/blog/topic/inclusivity) - [Independent Technical Report (1)](https://www.rmgeoscience.com/blog/topic/independent-technical-report) - [Mining Act (1)](https://www.rmgeoscience.com/blog/topic/mining-act) - [NI43-101 (1)](https://www.rmgeoscience.com/blog/topic/ni43-101) - [Reports (1)](https://www.rmgeoscience.com/blog/topic/reports) - [Ronacher McKenzie Geoscience (1)](https://www.rmgeoscience.com/blog/topic/ronacher-mckenzie-geoscience) - [Technical Reporting (1)](https://www.rmgeoscience.com/blog/topic/technical-reporting) - [WGC (1)](https://www.rmgeoscience.com/blog/topic/wgc) - [What's New with RM Geoscience (1)](https://www.rmgeoscience.com/blog/topic/whats-new-with-rm-geoscience) - [Women Geoscientists in Canada (1)](https://www.rmgeoscience.com/blog/topic/women-geoscientists-in-canada) - [coiled tubing drilling (1)](https://www.rmgeoscience.com/blog/topic/coiled-tubing-drilling) - [hyperspectral core imaging (1)](https://www.rmgeoscience.com/blog/topic/hyperspectral-core-imaging) [see all](https://www.rmgeoscience.com/blog/tie-lines-can-be-used-for-more-than-constraining-magnetic-data#) ### Recent Posts #### Geological & Geophysical Services - [Data Integration, Analysis and Interpretation](https://www.rmgeoscience.com/data-integration-geology-geophysics-geochemistry-2d-3d-modeling) - [Geophysical Services](https://www.rmgeoscience.com/geophysical-services-surveys-rock-analysis-qa-qc-interpretation) - [Project Generation and Property Assessment](https://www.rmgeoscience.com/mineral-project-generation-property-assessment-for-investors) - [Exploration Project Management](https://www.rmgeoscience.com/exploration-project-management-consulting-field-programs) - [Technical Reports](https://www.rmgeoscience.com/geology-geophysical-technical-reports-for-exploration-mining) - [Lands Management](https://www.rmgeoscience.com/lands-management-geoscience-resource-consulting-services) #### Get In Touch **RONACHER MCKENZIE GEOSCIENCE INC.** 6 – 2140 Regent St. Sudbury, Ontario, Canada P3E 5S8 [ (705) 419 - 1508](tel:+17054191508) [![Contact Us](https://no-cache.hubspot.com/cta/default/2890816/26fd02c7-4964-467d-b3a1-bd3c3ed55a48.png)](https://cta-redirect.hubspot.com/cta/redirect/2890816/26fd02c7-4964-467d-b3a1-bd3c3ed55a48) . 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