6 Backup Rules to Prevent Data Loss on Total Stations

Because a total station treats distances, angles, coordinates, elevations, point names, observation conditions, and so on measured in the field as data, post-survey management affects the reliability of the deliverables. On site, even if everything looks fine immediately after measurement, problems can occur later when attempting to retrieve the data: you may not know where it was saved, it may have been overwritten by other work data, the instrument’s power may have gone off, the storage medium may have been lost, or old data may have become mixed in during office filing. Especially on sites where a total station is shared among multiple people or when work involves covering multiple sections in a single day, rules for data preservation are as essential as observation accuracy.

This article explains, in six rules, a backup approach that field practitioners of optical surveying instruments can follow easily to prevent data loss. As content independent of specific equipment or software, it organizes the workflow from daily checks, file naming, data retrieval, dual storage, and verification through to handover.

Table of Contents

• Impact of data loss from electronic total stations on on-site operations

• Rule 1 Decide the save location and job name before observation

• Rule 2 Separate data by work unit to prevent overwriting

• Rule 3 Verify the equipment's internal data before leaving the site

• Rule 4 Back up to multiple storage locations on the same day

• Rule 5: Open the extracted data and verify its contents

• Rule 6: Record backup status when lending or handing over

• Approach to Establishing Backup Operations for Electronic Total Stations

• Summary

Impact of Data Loss from Total Stations on the Job Site

Data loss from a total station is not simply a matter of missing survey data. When information obtained on site—such as the coordinates of measured points, measured distances, horizontal angles, vertical angles, instrument points, backsight points, prism heights, and observation times—is lost, the basis for as-built verification, setting out, batter-board layout, control point checks, and construction management records is lacking. While additional working hours may compensate at sites where re-surveying is possible, the impact is much greater in situations where re-surveying under the same conditions is impossible—after backfilling, after paving, after formwork removal, or after subsequent construction has progressed.

Because a total station is equipment used in the field, data management is exposed to unstable factors such as rain, dust, vibration, movement, power loss, insertion and removal of storage media, and changes of personnel. Even if the surveying itself is conducted carefully, if storage and retrieval after surveying are handled ambiguously, problems will surface when verifying the results. On site, operations that rely only on memory—“I must have measured it,” “I think I saved it,” “I may have used the same name as last time”—should be avoided.

Also, equipment failure is not the only cause of data loss.

In practice, management mistakes also occur — for example, job names are not standardized, storage locations vary by operator, file names are changed after retrieval, old and new data are mixed in the same folder, or data on the device are deleted before being checked in the office. When people think of backups, they tend to imagine only the act of copying to a storage medium, but what is really needed is a system that prevents data from getting lost from before observation through delivery and storage.

Backing up a total station doesn't have to be a difficult task. What matters is that the workflow is the same regardless of who performs it, the timing of checks is predetermined, data filenames allow you to infer their contents, data is not left only on the device, and you open and verify it after extracting it. By establishing these as site rules, it becomes easier to reduce the risk of data loss.

Rule 1 Decide the save destination and job name before observation

The first rule to prevent data loss from a total station is to decide the storage location and job name before starting observations. If you try to sort things out after surveying, being rushed by site moves and the next phases will make it hard to tell which data corresponds to which task. Naming before observation is especially important when you carry out multiple surveys on the same day or when you perform successive tasks at the same site, such as control point checks, batter board layout, and as-built inspections.

Include elements in the job name that indicate the date, site name, work section, task, and person in charge to make organization easier. For example, names like simply "Survey" or "Site Data" do not allow you to determine the content later. A site name alone is also insufficient, because if you conduct observations at the same site multiple times you won’t be able to distinguish them. Combining the date and the task makes it easier to understand the context of the data when checking it later.

However, if a job name is made too long, it may only be partially displayed on the device or make post-transfer management cumbersome. Therefore, it is practical to establish an in-house abbreviation rule that is easy to use. Shorten site names, represent sections with symbols, standardize work descriptions into common terms, etc., keeping them concise so anyone can understand their meaning. Avoid using abbreviations that only the person in charge can understand, as that can cause confusion during handovers.

Confirming the storage destination is also important. Depending on the model and settings of the total station, the data storage location may differ—on the instrument itself, on external recording media, on a connected terminal, or within the surveying software. If you proceed without checking where data are set to be saved before observation, you may mistakenly believe after surveying that the data were 'not saved', or conversely delete data that exist only on the instrument itself.

When checking before observations, always be conscious of whether you created a new job or opened an existing one. Reusing an existing job makes it easy for past data and the day's data to become mixed. Even if you refer to an existing job for operational reasons, it's safer to store the current day's observation data in a separate location. Be especially careful when you only want to reuse a coordinate list: check that the observation results have not also been added to the same job.

The purpose of this rule is to create a framework for organization before saving data. Just as you check instrument stations and backsights to ensure surveying accuracy, you should confirm the storage destination and job name for data preservation. Rather than frantically searching after observations, creating a state in which you won’t get lost before observing is the first step in backing up.

Rule 2 Separate data by work unit to prevent overwriting

One common problem in data management for total stations is data loss caused by overwriting or mixing. Even if the data itself remains on the device, if you can no longer tell which point was observed when, the data becomes difficult to use in practice. For backups, it is important not only to ensure that data hasn’t disappeared, but also to keep it in a state where it can be reused as accurate information.

Separating data by work unit means not cramming observations with different purposes—such as control point checks, setting-out (stakeout), as-built inspections, checks near boundaries, and verification of earthwork heights—into a single dataset. Putting everything into the same job may seem organized at first, but it makes it easy to select the wrong items when extracting results later. Especially when point names are similar, mixing design points with measured points, check points with auxiliary points, or temporary points with adopted points can leave you unsure how to classify them when organizing after a backup.

To prevent overwriting, it is effective to operate so that past data are not used as editable material. Even when referring to previous coordinates or point names, instead of modifying the original data directly, duplicate it as the day's working data and use that. If you open the original data as-is and perform additional observations, you may later be unable to tell where the previous entries end and the current ones begin. This can make it look as if the data have not been lost, while in reality the history has been effectively erased.

The way point names are assigned also affects backup quality. If the same point name is used repeatedly, the software may treat them as duplicate points after retrieval or the old values may be replaced by new ones. Even if the field crew understands this, if a different person in the office handles the data they will make decisions based only on the point names. Including elements in the point name that indicate the work type, measurement point number, number of verifications, or that it is an auxiliary point makes it easier to prevent processing errors.

Also, it is important not to casually delete unnecessary data on site. During observations there may be measurement errors or trial measurements, but if you make an immediate decision on which data to delete on site, you may lose verification records that are needed later. Except for obvious input errors, it is safer to distinguish them with point names or notes and organize them after checking at the office rather than deleting them. If you must delete data, adopt a procedure of making a backup before deletion to be safe.

The rule of splitting data by work unit is not meant to increase the volume of data but to preserve meaningful groupings. Total station data are used not only at the moment of observation but later for report generation, incorporation into drawings, preparation of as-built records, internal verification, explanations to the client, and so on. The value of a backup is that it keeps the information in a state where its contents can be traced when those uses occur.

Rule 3 Check the device's internal data before leaving the site

People tend to think backups are done after returning to the office, but to prevent data loss from a total station, it is essential to check before finishing work on site. If you discover missing data after leaving the site, you may incur travel time for re-measurement, and schedule constraints can make re-measuring difficult. As a rule, anything that can be checked on site should be checked while you are still there.

Before leaving the site, first confirm that the day's job has been correctly saved. Check the number of observed points, the work performed, the order of point names, the final observation time, and so on to verify that the planned survey has been recorded. It is important to confirm on the screen that data exist in the instrument, rather than relying on the memory that you "pressed the save button." If there are multiple operators, having someone other than the person responsible check as well, if possible, can reduce oversights.

Next, confirm conditions that affect the results, such as the instrument station, backsight point, mirror height, measurement units, coordinate system, and the treatment of elevations. These may be recorded as settings or notes separate from the data itself, and even if only the observations remain, reproducibility suffers if the conditions are unknown. Backup targets are not limited to point coordinates or distances. Observation conditions and the rationale for field decisions are also important information for later verification of the results.

Before finishing work on site, also pay attention to the device battery level and the condition of the storage media. Saving or exporting data while the power is unstable may cause the save process to be interrupted. When using removable media, be mindful of the timing of insertion and removal. Removing it during a write or turning off the power before confirming that saving is complete can cause data corruption. Make it a habit to confirm that the save process has finished before packing up.

It is also useful to leave a simple record on site. You don’t need to copy all the data onto paper, but leaving the job name created that day, the work scope, main point names, the person in charge, planned backups, and any notes in a work memo will be helpful when searching for data later. If the data stored in the total station corresponds with the field memo, organizing things in the office will be smoother.

This check can be effective even if it's a simple one that takes only a few minutes at the end of the work. The important thing is to confirm, before leaving the site, that "the data exist," "the contents match the day's work," and "the saving process has been completed." If you consider surveying work to be complete not at the moment the last point is measured but when you've confirmed that the data have been safely preserved, you can reduce the risk of loss.

Rule 4 Back up to multiple storage locations on the same day

Keeping total station data only on the instrument is risky. If the instrument fails, is lost, is operated incorrectly, is initialized by a borrower, or the recording media are damaged, the impact will be greater the more you relied on the device's internal data. After finishing work on site, make it standard practice to back up to multiple storage locations on the same day.

Having multiple storage locations does not mean creating two identical copies in the same place. Store copies separated into locations that serve different roles, such as the device itself, office workstations, shared storage locations, and external recording media. Simply gathering everything on a single terminal risks losing it if that terminal malfunctions. Conversely, if you feel secure by copying only to on-site recording media, you will not be able to recover the data if that medium is lost.

The reason for doing it on the same day is that you can organize things while your memory is still fresh. If you try to back up a few days later, similar job names accumulate and it becomes hard to tell which is the latest. Once the operator has moved to another site, verification takes time. By extracting data from the equipment on the day the survey is conducted, saving it to the designated storage location, and organizing folder and file names, you can prevent confusion in downstream processes.

The folder structure where files are stored is also important. Combine the site name, fiscal year, construction section, work date, work content, etc., into an easy-to-search hierarchy. If folder names are ambiguous, you won’t be able to find what you need even if you have backups. Data loss includes not only physical disappearance but also situations where data exists yet cannot be found. By deciding on a folder structure that anyone can follow, usability after storage is improved.

When backing up, it is also important to separate and store the original data and the converted data. If you overwrite the raw data extracted from the total station, the data after coordinate or format conversion, and the data reflected in reports and drawings with the same name, you will no longer know which one is the original observation result. Store the original data with as little editing as possible, and manage the processed data under different names. This makes it easier to review the processing later or to re-export in another format.

Also, backups are not a one-time task. After organizing files on the work device, when moving them to shared storage, if you change file names, correct point names, remove unnecessary points, or create reports, the updated data also becomes subject to management. However, it is important not to overwrite the original data but to retain the updated version in a way that preserves the history. Keeping only the latest version is simple, but it can make it impossible to trace the cause if a problem occurs.

When using shared storage locations or cloud-based storage, follow internal rules and check access rights and editing permissions. If you place original data in a location where anyone can delete it, there is a risk of accidental deletion or overwriting at backup destinations. Protecting the original data and keeping it separate from editable files can enhance post-storage safety.

Multiple backups on the same day tend to be postponed amid the busyness of the field. However, survey data cannot always be re-acquired later. To ensure that data obtained with a total station reliably leads to deliverables, it is necessary to immediately distribute and store copies in secure, separate locations after observation.

Rule 5 Open the extracted data and inspect its contents

A common pitfall with backups is feeling reassured merely because you copied the files. Even if you extract data from an optical surveying instrument and save it to a folder, it isn’t a secure backup unless you verify that the files open correctly, contain the necessary points, and have no garbled characters or format mismatches. Data may appear to be saved but the contents can be unusable.

Extracted data should be opened and checked on the same day whenever possible. Checks include that the file can be opened, that point names are readable, that coordinate values and elevations do not appear abnormal, that the number of points does not differ significantly from the number confirmed on-site, and that the work date and job name match. If a format conversion was performed, also check whether the number of points or the values of key points have changed before and after conversion. It is not necessary to recompute every value in detail, but performing at least basic consistency checks makes it possible to detect anomalies early.

Particularly important are the handling of coordinate axes and units. Even if measurements at the site are correct, settings when exporting or converting can cause the order of coordinates, the treatment of elevation, the number of decimal places, angle notation, and so on to differ from what was expected. These may appear to be issues separate from data loss, but in practice they can render the data unusable, so they should be treated as part of backup verification.

Also, it's important not to rely on the filename alone. Even if a filename appears correct, the contents may be data from a different day. Conversely, a filename may still be provisional while the contents are correct. Ultimately, confirm that the files are that day's survey data by cross-checking the filename, folder location, job name, point names, and work notes. This will prevent situations later where you thought you had saved the data but it turned out to be a different dataset.

Pay attention to the environment used to open extracted data. If a file can be opened on a field worker’s device but not in the office processing environment, work will stop at the report-creation or drawing-update stage. If possible, convert the data into the format actually used in subsequent processes and verify that it can be loaded. Checking items such as the completion management table, coordinate lists, and drawing data in a state close to their final usable form increases the practical usefulness of backups.

Record the verification results; a simple record is fine. If you record the verification date, verifier, storage location, target job, and whether any anomalies were found, you will be able to tell later who checked what and how far they got. If there was a problem, it will also be easier to trace at which stage it was noticed. A backup is both the task of copying data and the task of confirming that the copied data can be used.

Rule 6 Record the backup status when lending or handing over

When electro-optical surveying instruments are shared across multiple sites or users, the moments of lending, returning, or handing over are when data loss is most likely to occur. If the next user deletes old data to use the instrument, the device is reset upon return, the storage media are swapped, or files are organized without knowing which data have been backed up, necessary data can be lost.

To prevent this risk, rules are needed to record the backup status when equipment is handed over. Simply writing "data present" or "backup completed" is insufficient. It should make clear which jobs were saved, when and where they were saved, and who confirmed them. In particular, if unbacked-up data remains on the device, it must be clearly communicated so the next user does not accidentally delete it.

At the time of lending, check whether previous data remains on the equipment. If data remains, determine whether it has been archived, can be deleted, or is still under verification. It is safer not to delete data whose status cannot be determined. Upon return, record the job name used that day and the backup destination, and share this information with administrators or the next person in charge as needed. This makes it easier to trace the relationship between data on the equipment and stored data.

During handovers, convey not only the content of the data but also the current state of any work in progress. For example: observations have been completed but office verification is pending; the original data has been saved but the converted data has not been created; some points require rechecking; not yet reconciled with field notes. If you only say "data has been saved" without communicating these statuses, the person in the next process may mistakenly assume that everything is finished.

It is also important to set a schedule for organizing the internal data of the optical surveying instrument. Even if you need to delete old data to free up device storage, confirm before deletion that the data have been backed up, that the extracted data can be opened, and that the storage location is recorded. Deleting data from the device should be performed as the final step after backup verification, and it is safer not to delete data in advance merely for on-site convenience.

Loan and handover records can be kept either on paper management sheets or as electronic records. What matters is that anyone can check the same items. If you record the equipment name, date of use, site name, job name, person in charge, backup destination, confirmation status, whether deletion is allowed, and any notes, it will be less likely that the scope of responsibility for data loss becomes unclear. With shared equipment, not only surveying skills but also the management of handovers affects data preservation.

Approaches to Establishing Backup Operations for Total Stations

Backup procedures for total stations will not become established merely by creating detailed rules. It is important to put in place a system that can be sustained on site. If procedures are too complex, they will be skipped on busy days or when staffing is low. Conversely, if rules are too vague, the process is left to each person's judgment, resulting in inconsistent data management quality. The ideal is to narrow down the necessary checks and make them executable in the same workflow every time.

First, clarify who is responsible for backups. If it is unclear whether the surveyor will do it, the site representative will check it, or an office staff member will store it, it tends to create a situation where everyone assumes someone else has done it. In practice, dividing roles so that the observer performs the primary check and the office conducts the secondary check helps reduce oversights. It is not necessary to fix one person as the person in charge, but you need a record that shows who was responsible on that day.

Next, establish fixed times for backups. Decide when and what to check—before leaving the site, after returning to the office, before the end of the workday, etc. If the timing isn’t set, the busier the day, the more it will be postponed. In particular, same-day backups should be performed before starting work on subsequent days. Because survey data is tied to memories of the site, the more time passes, the more time-consuming verification becomes.

Creating a common naming convention within the company is also effective. Deciding how to abbreviate site names, how to format dates, how to denote types of work, how to handle revised versions, and where to store original data makes it easier to keep things organized even when personnel change. Consistency is more important than perfection in naming rules. Rules that can be used on site without hesitation will take hold more readily than overly complex regulations.

From an educational standpoint, sharing examples of data loss raises awareness. Rather than simply saying "make backups," explaining in which situations data is likely to be lost and which processes will be affected if data is lost is better understood by operational staff. The more familiar someone is with operating a total station, the more likely they are to perform saving and retrieval out of habit. To prevent omissions caused by familiarity, periodically review the rules.

Furthermore, it is important not to limit backup targets to survey data alone. Site notes, observation conditions, coordinate lists, design values, as-built verification documents, photographic records, and supplementary explanations—information necessary to understand the survey results—should be managed together. Even if only the data from the total station remains, if it is not clear which design values it was checked against, which control points were used, or what judgments were made on site, verification in later stages will take time.

The ultimate goal of establishing backup operations is to reduce rework in the field. Of course it's important not to lose data, but by keeping data easy to find, easy to verify, and easy to hand over, the entire post-survey workflow becomes more stable. To make full use of a total station's accuracy, a data management system is as important as surveying techniques.

Summary

To prevent data loss from a total station, it is important not just to hastily copy files after observation but to decide before observation on the storage destination, job name, work unit, verification method, storage location, and handover procedures. Survey data are not finished deliverables at the moment they are collected in the field. Only when they are correctly saved in the instrument, extracted, stored in multiple locations, checked for their contents, and made traceable by anyone later do they become data you can confidently use in practice.

The six rules introduced here are basic practices you can start without any special system. They are: deciding the storage location and job name before observations; separating data by work unit; checking the device’s data before finishing at the site; backing up to multiple storage locations on the same day; opening extracted data to verify its contents; and recording the backup status when lending or handing over. Incorporating these into your daily workflow will reduce practical risks not only from equipment failure and operator error but also from overwriting, mixed files, forgetting to retrieve data, and accidental deletions.

In sites that use total stations, procedures to protect data are just as important as installation and aiming to ensure accuracy. Even accurately measured data can become unusable as a deliverable if saved file names are ambiguous, if the data remains only on the instrument, or if it is not checked after being transferred. Including confirmation of data saving and backups in the completion criteria for surveying work enhances the reliability of field management.

Going forward, it will be important to make data acquired with total stations easy to verify on site and to streamline the workflow for recording, sharing, and handing over that data. When reviewing the environment for handling on-site surveying data, consider not only the operation of the instrument itself but also smartphones and tablets, internal shared folders, cloud-based recording and sharing tools, and other components, and implement a secure data management system suited to the site.