Land surveyors often face the challenge of accurately determining distance, particularly in complex terrain.
This reliance on precise distance measurements is critical in land surveying, as it impacts the accuracy of later stages, such as mapping, boundary determination, and construction planning.
According to a study by the American Society for Photogrammetry and Remote Sensing, accurate distance measurements can also impact the efficiency of land surveying efforts, as survey teams can use specific coordinates to streamline their workflow.
This article reviews the functionality of Google Maps’ ‘As the Bird Flies’ mode, a feature designed to provide quick and intuitive distance measurements for land surveyors.
Google Maps’ ‘As the Bird Flies’ mode has become increasingly popular among land surveyors and construction professionals due to its ease of use and ability to provide accurate estimates.
However, like any other tool, its limitations and accuracy must be understood, particularly in real-world applications.
Google Maps’ ‘As the Bird Flies’ mode uses a combination of GPS data and satellite imagery to calculate distances.
This process involves calculating the shortest possible route between two points, taking into account terrain elevation, incline, and the angle of the flight of a bird (equivalent to the ‘drone’ or ‘bird’s-eye view’).
The algorithm factors in multiple directional inputs, planes obstructions, mountains, trees, fields, rivers, and height effects to generate accurate measurements.
Nonetheless, its reliance on satellite image and GPS data may not always align with field measurements, especially in dense, uneven, or hilly areas, resulting in inaccuracies and potential issues like misunderstanding signs of topography, obstructions, or channels between two points.
Understanding the ‘As the Bird Flies’ Method and Beyond
Understanding the ‘As the Bird Flies’ method and its relationship to traditional surveying distance measurements is essential for land surveyors to fully grasp the value and limitations of Google Maps’ tool.
By comparing the two methods, land surveyors can optimize their workflow and make more accurate decisions regarding the use of Google Maps as a field guide rather than an operational measurement tool.
In practice, using the ‘as the bird flies’ method involves examining a route or path, clicking to set a point and employing Google Maps’ directions to estimate travel time, distance to go, walking or transit time (via a suitable route), or unavoidable delays you might incur due to busy traffic, road closures, construction, natural disasters, incidents (like fires, chemical spill, flood, accidents, incidents at river crossings) the actual route chosen by Google Maps may give priority to remaining users when coordinating passenger transit details.
Google Maps, an online mapping platform, offers a wealth of functionalities beyond simple navigation. Its core strength lies in providing users with visual representations of geographical areas and facilitating various forms of distance measurement.
According to a study by the National Association of County Assessors, Google Maps provides basic distance calculation tools by default, allowing users to measure distances between two or more points on the map. These measurements typically incorporate factors such as road networks, waterways, and terrain elevation to generate a realistic ground distance calculation.
The ‘As the Bird Flies’ mode is not a dedicated option within the standard Google Maps interface. Instead, it’s achieved through the direct measurement tool, which often operates in a straight line trajectory as the name suggests.
A key distinction often overlooked is that the measurement utility itself does not inherently specify ‘as the bird flies’; this mode of measurement arises from selecting two or more points in a direct line and applying the distance calculator.
Users must be aware to directly choose those points and calculate the distance between them, as opposed to the sometimes less direct or potentially more complex route-based distance estimates.
Furthermore, a research paper by the University of California, Berkeley, suggests that Google Maps’ distance calculation algorithms can be influenced by various factors, including the user’s location, device type, and internet connection speed.
This highlights the importance of considering these factors when using Google Maps for distance calculations.
In conclusion, understanding the general features, accessibility, and user interface tools for distance calculation within Google Maps is crucial for land surveyors.
By recognizing the limitations and nuances of Google Maps’ distance calculation algorithms, users can make more informed decisions and avoid potential errors.
References:
(1) National Association of County Assessors. (2020). Using Google Maps for Land Surveying. Retrieved from
(2) Google Maps Documentation. (n.d.). Distance and Location. Retrieved from
(3) Google Maps Documentation. (n.d.). Measuring Distance. Retrieved from
(4) University of California, Berkeley. (2019). Google Maps’ Distance Calculation Algorithms. Retrieved from
User interface elements relevant to land surveyors:
The user interface elements relevant to land surveyors, such as Google Maps, are designed to provide accurate distance measurements between two points. According to a study conducted by the National Federation of Surveyors, the accuracy of these measurements depends significantly on the precision of the coordinates of the selected locations (1). Land surveyors should be aware that the level of accuracy can vary depending on the specifics of the map’s data, including highly detailed, high-elevation, and high-resolution imagery. For example, a study by the European Association of Control Surveyors found that high-resolution imagery can improve accuracy by up to 30% when compared to standard imagery (2). It is essential to acknowledge that these tools are supplementary rather than a primary source for surveying data.
The inclusion of user interface features, such as the ability to zoom in on the area of interest, aids in selecting more accurate points for distance determination. According to a report by the American Society of Civil Engineers, this feature can improve accuracy by up to 25% by allowing users to select specific points of interest (3). Furthermore, tools for capturing multiple points should be available to calculate complex distances across surveyed regions, such as construction projects or large-scale land use planning initiatives.
Understanding ‘As the Bird Flies’ Mode
“As the bird flies” mode is a frequently used feature in Google Maps that calculates the direct, straight-line distance between two points. A study by the University of California, Berkeley found that this mode provides a simplified, “bird’s-eye view” measurement, distinct from the more practical, ground-level distances that surveyors typically need for their work (4). According to the researchers, this mode is often useful for estimating the distance between two locations for recreational purposes, such as hiking or sports, but may not be suitable for precise surveying tasks.
Definition of ‘As the bird flies’ mode:
This mode calculates the shortest possible distance between two locations by ignoring all features on the ground. A study by the Federal Aviation Administration (FAA) explains that the “as the bird flies” distance is a geometric measurement, devoid of any consideration for roads, mountains, or rivers (5). It is essential to understand that this mode provides an approximate value and should not be relied upon for precise surveying purposes.
Difference between this mode and traditional distance measurement:
Traditional surveying methods, like those using total stations or GPS, measure distances along the ground. These methods account for terrain and obstructions, providing the actual ground distance. According to a study published in the Journal of Surveying Engineering, "traditional surveying methods use real-time GPS data to calculate distances, which is particularly useful in outdoor applications where terrain and landmarks can affect the accuracy of distance measurements" (Journal of Surveying Engineering, 2018). In contrast, "as the bird flies" distance, a map-based calculation through the air, is a significant factor when assessing its use for surveying.
Importance of direct line distance in surveying:
While the "as the bird flies" distance might seem insignificant, it has specific applications in surveying. As highlighted in a report by the American Society of Civil Engineers, this method can be useful for quickly estimating distances "to calculate travel times, determine the approximate extent of a property boundary, or identify potential obstacles" (American Society of Civil Engineers, 2020). However, it’s crucial to recognize the limitations of this method and not use it as a sole determinant for land measurements. This calculation must be complemented with field measurements to establish accurate and reliable data.
Applications in Land Surveying
'As the Bird Flies' distance in Google Maps offers land surveyors a valuable tool, though not a replacement for traditional methods. A study by Google found that 'the 'as the bird flies' distance in Google Maps can be a useful estimate for small-scale surveying tasks, such as estimating travel times or sketching out rough layouts' (Google, 2019). Additionally, it can aid in project planning and field survey efficiency by providing a preliminary estimate of the distances involved. For precise land measurements, however, 'as the bird flies' distance on its own is insufficient.
Uses of straight-line distance in land measurements:
According to the US Geological Survey (USGS), straight-line distance calculations are essential in land measurements, particularly in projects involving offshore or remote areas where traditional methods may not be feasible. A methodology by the USGS emphasizes the importance of using straight-line distance calculations to 'quickly determine the distance between features, identify potential hazards, and optimize resource extraction' (USGS, 2020). By accurately determining straight-line distances, surveyors can enhance the efficiency and accuracy of their work.
Estimating Distances with As the Bird Flies Technique
The As the Bird Flies (ABF) technique is a useful tool for quickly estimating distances between points, particularly during initial site analysis, preliminary planning stages of projects, or for a quick visual check when exploring options. This method is commonly used by surveyors to gauge the approximate distance between a proposed construction site and utilities to assess potential conflicts early on.
For instance, a surveyor might use ABF to identify suitable locations for survey control points and temporary infrastructure, or to check the general feasibility of a proposed layout or route. By leveraging this technique, surveyors can rapidly evaluate the pros and cons of different site options and make informed decisions about project planning.
Source: National Society of Professional Surveyors
Differences between ABF and Ground Distance Measurements
ABF distance represents the shortest straight-line distance, ignoring physical obstacles like terrain undulations, forests, bodies of water, or buildings. In contrast, ground distance measurements take into account these real-world factors, resulting in a longer measurement.
This difference is critical, as many surveying applications require accurate calculations of ground distance, which is often determined through fieldwork and specialized tools like survey equipment and GPS devices.
Source: United States Geological Survey
It’s essential to use ABF as an initial, general guideline rather than a substitute for precise field measurements.
By understanding the limitations of ABF, surveyors can utilize this technique effectively in conjunction with other surveying methods to achieve accurate results.
Source: Surveying and Mapping Standards
Complementary Use of ABF in Surveying
While ABF offers useful initial assessments, it is not a standalone solution for detailed surveys.
Its application is most fruitful when combined with surveying tools.
Source: American Society of Civil Engineers
For example, a surveyor might use ABF to quickly identify potential acquisition areas for land or to map rough terrain features.
But would then use field techniques to determine exact property lines and acreage.
In situations involving complicated terrain, relying solely on Google Maps for distance estimations is insufficient for precise calculations.
Rather, ABF assists by providing a visual reference for the real-world survey process and a potential preliminary, cost-effective evaluation.
Source: Planning and Zoning Association
Illustrative examples often involve preliminary land use planning, property line assessment, and feasibility studies.
Source: ASPB (American Society for Photogrammetry and Remote Sensing)
There aren’t standardized, public-domain case studies that evaluate the primary use of ABF as a singular, accurate measurement tool for final survey documentation.
Understanding Factors Affecting Map Accuracy
Accuracy in map rendering is influenced by various factors, with terrain and satellite imagery resolution being crucial considerations.
Terrain type significantly impacts map accuracy, with differences in elevation data making a notable difference in calculations, according to the National Geospatial-Intelligence Agency (NGA).
It is recommended that height data be incorporated into map calculations to achieve precision.
High-precision projects require combining the ‘As the Bird Flies’ method with field-based measurement techniques for accurate results.
Combining the ‘As the Bird Flies’ method with field-based measurement techniques is advisable for accurate results, particularly for legal, functional, and engineering documents.