Question 1

Does deep snow cover or deeply frozen ground completely prevent a wintertime geophysical survey from being successfully conducted?

Accepted Answer

Deep snow or frozen ground usually does not stop a wintertime ground penetrating radar cemetery survey for unmarked grave detection, but it can limit speed and data quality. Dry, firm surfaces often scan well. Sentry Mapping will assess conditions and schedule accordingly.

Ground penetrating radar cemetery surveys can often be done in winter. Deep snow cover or deeply frozen ground does not automatically stop a cemetery survey, but it can affect access, speed, and data quality.

For cemetery mapping, burial plot mapping, and grave locating, our technicians scan with high-frequency GPR and mark detected graves, then tie results to precise GPS for cemetery GIS mapping and digital cemetery mapping. If the snow is light and dry, surveys may still run smoothly. The toughest winter conditions are deep, wet snow, slush, and uneven ice because they lift the radar cart, reduce surface contact, and add noise. In those cases, a plowed path, a smaller phased approach, or a schedule change may be the best option.

Frozen ground can be workable, but freeze-thaw layers and changing moisture can shift signal behavior and make depth estimates less consistent. Because GPR has limitations based on ground conditions and weather, we review your site and timing up front and recommend the most reliable path forward.

When conditions are suitable, you still receive the full deliverables: a printed master map, an online searchable web map, and optional loading into our cemetery management software for ongoing recordkeeping.

Question 2

How Accurate Are the Results of Ground Penetrating Radar?

Accepted Answer

Ground-penetrating radar is highly accurate. Under typical cemetery conditions, Sentry Mapping’s GPR pinpoints a burial center within about ±6 inches and estimates depth within ±10 percent. Results depend on soil, moisture and grave materials, but high-frequency antennas and precision GPS let us document virtually every grave without disturbing the ground.

Ground penetrating radar (GPR) is one of the most accurate, non-invasive tools for cemetery mapping. In controlled field tests and hundreds of Sentry Mapping projects, our 400–900 MHz antennas routinely locate the center of a casket, vault or soil disturbance to within ±6 in horizontally and predict depth within ±10 percent.

Accuracy ultimately depends on site conditions. Dry, sandy or loamy soils transmit signals best, while heavy clay, high moisture or dense roots can attenuate them. Even when wood coffins have collapsed, the back-filled trench and any metal hardware still produce a distinctive hyperbola pattern. Our technicians adjust antenna frequency, line spacing and survey speed to suit each cemetery’s soil, topography and burial construction, extracting the clearest data possible.

After scanning, every subsurface hit is tied to centimeter-level GPS and imported into our cemetery GIS mapping workflow. You receive a printed master map and an interactive, searchable web map on Chronicle cemetery management software, so staff and visitors can locate graves instantly with a phone.

Question 3

How can we determine how many available burial plots remain in our cemetery?

Accepted Answer

Commission a professional cemetery mapping survey. Sentry Mapping scans every grave with ground-penetrating radar, matches results to GPS, and builds an interactive GIS map. The digital map shows every occupied and vacant space, letting you see exactly how many plots are still available and where they lie.

Start with a complete cemetery mapping audit from Sentry Mapping. Our field crew walks every row with high-frequency ground penetrating radar (GPR) and sub-inch GPS. The equipment detects both marked and unmarked burials, then ties each location to a unique grave ID.

Next, our drafting team draws plot boundaries over recent drone imagery, so every lot has a digital outline. The occupied graves are shaded; open spaces stay clear.

The finished GIS map is uploaded to Chronicle cemetery management software and to a free public web map. In one click you can filter by “vacant,” export a count of unused plots, or print a color plan for board meetings.

Because the survey covers 100 % of the ground surface, you avoid the risk of selling an already occupied space or wasting room between rows. We also give you a spreadsheet of availability that updates automatically as your staff assigns new burials.

Most small cemeteries receive results in two to four weeks with no on-site digging, no disruption, and no ongoing subscription fees. The result is a clear answer to “how many plots do we have left?” and a reliable tool to plan decades of future interments.

Question 4

What are the hidden risks if a cemetery does not properly map its plots?

Accepted Answer

Cemetery mapping errors trigger big bills: you might sell an occupied plot, pay to move remains, lose revenue to unsold space, and waste staff hours hunting paper records. Professional ground-penetrating-radar mapping prevents these hidden costs and protects your reputation.

Without reliable cemetery mapping, money slips away. An inaccurate burial plot map can lead your team to re-sell a plot that already contains an unmarked grave. Correcting that mistake usually means a disinterment plus new vault, labor, and re-interment. Families may sue for emotional distress, adding legal fees and public embarrassment.

Fear of striking unknown burials forces crews to dig wider or avoid usable ground, leaving prime space unsold. Even ten “ghost” spaces equal tens of thousands in lost revenue. Staff also spend hours hunting ledgers for each request. Combined, all of these avoidable expenses easily exceed the cost of a professional survey.

Sentry Mapping removes those risks. Our ground penetrating radar cemetery survey detects every marked and unmarked grave, utility line, and obstacle. We deliver precise GPS burial plot mapping and targeted grave locating. You also receive a printed master map plus a searchable digital cemetery GIS map hosted free online. We include a read-only program that lets visitors walk straight to the grave on a phone, and it can be converted to a full cemetery management software program at most any time to keep your digitized cemetery records current. Professional cemetery mapping turns hidden costs into clear data so you can protect heritage, avoid liability, and unlock revenue.

Question 5

What types of cemeteries (size, geographic region) are suitable for GPR mapping?

Accepted Answer

Any burial ground in the 48 contiguous United States, from a half-acre historic churchyard to a 500-acre municipal park cemetery, can be mapped with Sentry Mapping's ground penetrating radar. Our team tailors antenna frequency and GPS grid density to regional soils, climate, and terrain, delivering precise results without disturbing a single grave.

Ground penetrating radar works at any scale for cemetery mapping. Sentry Mapping’s professional field teams routinely survey tiny country churchyards measuring less than one acre, mid-sized 20- to 50-acre community cemeteries, and sprawling municipal sites of 300 acres or more. Because crews establish a sub-inch-accurate GPS grid before scanning, adding or subtracting acreage is simply a matter of extending the grid. No special preparation or staging area is required.

Geography is equally flexible. Our GPR crews travel to all 48 contiguous states and can produce clear subsurface images in Gulf-Coast sand, Appalachian clay, Rocky-Mountain till, and the high-moisture soils of the Pacific Northwest. Dry, sandy or loamy soils transmit radar best, but even heavier, wetter soils reveal the disturbed trench signature of a 3- to 6-foot-deep grave once the right antenna frequency and processing filters are applied. We bring a variety of equipment so technicians can match soil conductivity and burial depth.

Whether you manage a half-acre historic graveyard behind a rural church or a 500-acre metropolitan park cemetery, Sentry Mapping provides the same turn-key deliverables: high-density GPR coverage of every square foot, drone and GPS control points, a color-coded master map, an interactive digital cemetery GIS map with free public web access, and our optional cemetery management software. That means you get one reliable system for unmarked grave detection, preventing double sales, and planning future interments, regardless of size or location.

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