H.A.R.N. Control Points

Disclaimer & Interactive Map

interactive map harnThe information on this website is made available as a public service. Maps and data are to be used for reference purposes only, and Otter Tail County, Minnesota, is not responsible for any inaccuracies herein contained. The information on cadastral maps is used to locate, identify and inventory parcels of land in Otter Tail County for reference only and is not to be construed or used as a legal description.

Map information is believed to be accurate but accuracy is not guaranteed.

In no event will Otter Tail County be liable for any damages, including loss of data, lost profits, business interruption, loss of business information or other pecuniary loss that may arise from the use of these maps of the information they contain. No responsibility is assumed for damages or other liabilities due to the accuracy, availability, use or misuse of the information herein provided. Information on this site is in the public domain and may be copied without permission. Citation of the source is appreciated.

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High Accuracy Reference Network


The Otter Tail County GIS Department is using a High Accuracy Reference Network (HARN) to locate with Real Time Kinematic (RTK) GPS Term Definition, mapping points to be used as control in the furthering efforts of creating a countywide parcel based GIS system.

This information is presented to the registered land surveyors and professional engineering communities to assist them with a set of reference control points. All roads in Otter Tail County are currently being driven and a search has begun to establish existing control points. When existing control points are found, they are double stubbed in from 2 different HARN stations when possible to produce a county coordinate value.

When no control point exists, existing occupation is located and shot once with RTK GPS equipment to establish a mapping position. While great care has been taken in the measuring and documentation of these control points, the professional land surveyor and engineer using them are expected to perform quality control checks of the values and assume all liability in using these values.

As any or more control points are established, county coordinates should be assigned to them. That information should be forwarded to this department so that it may be added to the existing control network. By doing this over time, Otter Tail County will have a countywide network set up consisting of HARN points and certified section corners containing county coordinate values. This will perpetuate the building and maintenance of an accurate public level survey system and parcel map compiled into a single web access.

This data set is only intended for the professionally trained. Use of this data, without a thorough understanding of projections, datums, county coordinate systems and the HARN network, will result in erroneous values.

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