{"id":30137,"date":"2026-05-19T12:12:40","date_gmt":"2026-05-19T10:12:40","guid":{"rendered":"https:\/\/biblus.accasoftware.com\/en\/?p=30137"},"modified":"2026-05-19T12:12:43","modified_gmt":"2026-05-19T10:12:43","slug":"topographic-survey","status":"publish","type":"post","link":"https:\/\/biblus.accasoftware.com\/en\/topographic-survey\/","title":{"rendered":"What is a Topographic Survey and why it is important"},"content":{"rendered":"<p class=\"sommario\">The importance of Topographic Survey in the design of buildings and infrastructures: the topographic survey<\/p>\n<p><!--more--><\/p>\n<p>The Topographic Survey is a technical representation of an area that integrates <strong>planimetric data<\/strong>, related to the position of elements on the horizontal plane, and <strong>altimetric data<\/strong>, related to elevations, differences in height, and slopes of the land.<\/p>\n<p>The Topographic Survey is essential in the fields of architecture, civil engineering, urban planning, and technical drawing, as it provides fundamental data for the design of buildings, infrastructures, and works on the territory. To obtain a reliable Topographic Survey, accuracy and data quality are decisive aspects, especially during the surveying, processing, and graphic representation phases.<\/p>\n<p>In this article, we will see what a Topographic Survey is, what the difference is between planimetry and altimetry, when a topographic survey is needed, what documents it produces, and what tools are used to acquire and process land data. We will also explore the role of drones, GNSS systems, digital terrain models, <a class=\"textualLink_edificius-progettazione-esterna\" href=\"https:\/\/www.accasoftware.com\/en\/3d-terrain-modeling-software\" target=\"_blank\" rel=\"noopener\">3D terrain modeling software<\/a>, and specific <a class=\"textualLink_usbim\" href=\"https:\/\/www.accasoftware.com\/en\/bim-google-maps\" target=\"_blank\" rel=\"noopener\">cloud solutions<\/a> used to automatically extract altimetric data and terrain textures from a simple selection on Google Maps<sup>\u00ae<\/sup> and create a detailed digital terrain model.<\/p>\n<div id=\"attachment_30140\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-30140\" class=\"size-full wp-image-30140 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2023\/11\/usBIM-land.jpg\" alt=\"elevation data and terrain textures automatically from Google Maps\u00ae\" width=\"800\" height=\"561\" \/><p id=\"caption-attachment-30140\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-30140 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2023\/11\/usBIM-land.jpg\" alt=\"elevation data and terrain textures automatically from Google Maps\u00ae\" width=\"800\" height=\"561\" \/><\/noscript> Elevation data and terrain textures automatically from Google Maps\u00ae<\/p><\/div>\n<h2 id=\"topographic-survey-what-it-is-and-what-is-the-difference-between-planimetric-and-altimetric-surveys\">Topographic Survey: what it is and what is the difference between planimetric and altimetric surveys<\/h2>\n<p>The topographic survey is a detailed graphic representation that combines two fundamental aspects: planimetry and altimetry.<\/p>\n<p><strong>Planimetry<\/strong> describes the horizontal dimensions of an area, such as the location of buildings, roads, boundaries, infrastructure, or other elements represented on a map.<\/p>\n<p><strong>Altimetry<\/strong>, on the other hand, describes the elevations of points, meaning their height relative to a reference altimetric plane, generally the mean sea level or another defined reference system.<\/p>\n<p>The topographic survey integrates these two pieces of information into a <strong>single document<\/strong>, allowing for the representation of both the planimetric position of the elements and the altimetric variations of the terrain. It is fundamental in architecture, civil engineering, urban planning, infrastructure, construction sites, and land-use planning.<\/p>\n<h2 id=\"what-is-a-topographic-survey\">What is a topographic survey?<\/h2>\n<p>A topographic survey is the technical activity through which both the planimetric position and the altimetric elevation of points present on a terrain or area of intervention are measured and recorded.<\/p>\n<p>Unlike simple planimetry, which only describes the position of elements on the horizontal plane, the topographic survey also allows for understanding the <strong>vertical variations of the terrain<\/strong>, <strong>elevations<\/strong>, <strong>slopes<\/strong>, and <strong>relations<\/strong> between <strong>existing elevations and design elevations<\/strong>.<\/p>\n<p>The acquired data is then processed to produce scaled plans, contour lines, profiles, sections, digital terrain models, and other useful documents for design.<\/p>\n<h2 id=\"when-is-a-topographic-survey-needed\">When is a topographic survey needed?<\/h2>\n<p>A topographic survey is needed when it is necessary to accurately know the <strong>planimetric position<\/strong> and <strong>altimetric elevations<\/strong> of a terrain, a lot, an infrastructure, or an area of intervention.<\/p>\n<p>It is particularly useful in cases of:<\/p>\n<ul>\n<li>designing new constructions;<\/li>\n<li>extensions of existing buildings;<\/li>\n<li>interventions on sloped terrains;<\/li>\n<li>designing roads, ramps, accesses, and parking lots;<\/li>\n<li>urbanization works;<\/li>\n<li>external arrangements and earth movements;<\/li>\n<li>boundary and distance verifications;<\/li>\n<li>calculating earthworks volumes;<\/li>\n<li>designing sewerage, hydraulic, and sub-services networks;<\/li>\n<li>BIM modeling of the terrain;<\/li>\n<li>creating DTM, profiles, and sections.<\/li>\n<\/ul>\n<p>Requesting a topographic survey in the initial phases allows for setting the project on reliable geometric data, reducing the risk of design errors, changes during execution, or inconsistencies on site.<\/p>\n<h2 id=\"role-and-importance-of-topographic-survey-in-architecture\">Role and Importance of Topographic Survey in Architecture<\/h2>\n<p>In architecture, the topographic survey is essential for designing buildings and structures in a way that is <strong>consistent with the terrain&#8217;s configuration<\/strong>. It provides information on elevations, differences in height, slopes, access points, distances, and relationships between the project and the surrounding context.<\/p>\n<p>For example, when designing a house on hilly terrain, the topographic survey helps assess the <strong>correct positioning of the building<\/strong>, the <strong>orientation<\/strong>, <strong>access points<\/strong>, <strong>earthworks<\/strong>, and the <strong>integration of the project into the landscape<\/strong>.<\/p>\n<p>The topographic survey is also fundamental in <strong>urban planning<\/strong>, as it allows for the evaluation of the impact of new infrastructures, roads, buildings, or urbanization works on the surrounding environment.<\/p>\n<h3>Main Applications of Topographic Survey<\/h3>\n<p>The topographic survey has <strong>numerous applications in the construction<\/strong>, infrastructure, and land sectors. It is used for the design of buildings, roads, bridges, technological networks, hydraulic works, external arrangements, earthworks, and linear infrastructures.<\/p>\n<p>In road work, for example, it allows for the definition of the <strong>topographic profile of the route<\/strong>, assessing slopes, elevations, contour lines, longitudinal profiles, and cross-sections.<\/p>\n<h2 id=\"what-documents-are-obtained-from-a-topographic-survey\">What documents are obtained from a topographic survey?<\/h2>\n<p>From a topographic survey, it is possible to obtain various technical documents, useful both in the preliminary stages and in final or execution planning.<\/p>\n<p>The most common documents are:<\/p>\n<ul>\n<li>detailed floor plan;<\/li>\n<li>surveyed plan;<\/li>\n<li>contour lines;<\/li>\n<li>longitudinal profiles;<\/li>\n<li>cross-sections;<\/li>\n<li>digital terrain model, or DTM;<\/li>\n<li>point cloud;<\/li>\n<li>orthophoto;<\/li>\n<li>calculation of excavation and fill volumes;<\/li>\n<li>CAD, GIS, or BIM documents;<\/li>\n<li>technical survey report.<\/li>\n<\/ul>\n<p>The choice of documents depends on the purpose of the survey, the required scale of representation, the expected precision, and the project phase in which the data will be used.<\/p>\n<h3>Common Errors to Avoid in Topographic Survey<\/h3>\n<p>In creating and interpreting a topographic survey, it is important to avoid common errors that could compromise the accuracy and effectiveness of the project.<\/p>\n<p>Among the most common errors are <strong>inaccuracies in data collection<\/strong>, <strong>use of uncalibrated instruments<\/strong>, <strong>incorrect georeferencing<\/strong>, <strong>failure to check control points<\/strong>, <strong>poor measurement quality<\/strong>, and <strong>lack of map updates<\/strong>.<\/p>\n<p>It is also important to consider environmental conditions, vegetation, obstacles present on site, and the required scale of representation, as these factors can affect the quality of the survey and the final output.<\/p>\n<h2 id=\"how-to-interpret-a-topographic-survey\">How to Interpret a Topographic Survey<\/h2>\n<p>To correctly interpret a topographic survey, it is necessary to understand the main elements present in the document, such as contour lines, elevations, surveyed points, conventional symbols, topographic references, and scale of representation.<\/p>\n<p>The contour lines, for example, represent lines that connect points of equal elevation. The closer they are, the steeper the slope of the terrain.<\/p>\n<p>Conventional symbols indicate elements such as roads, watercourses, buildings, and points of interest.<\/p>\n<p>To make correct design decisions, it is essential to know how to read these data and relate them to the real context, evaluating elevations, height differences, slopes, accessibility, and constraints present in the area.<\/p>\n<h2 id=\"phases-of-creating-a-topographic-survey\">Phases of creating a Topographic Survey<\/h2>\n<p>The creation of a Topographic Survey involves <strong>various phases<\/strong>: preparation of the survey, data acquisition in the field, processing, quality control, and final delivery.<\/p>\n<p>Initially, it is necessary to <strong>gather available information<\/strong> about the area to be surveyed, such as maps, cadastral data, existing project documents, land constraints, and reference systems to be used.<\/p>\n<p>Subsequently, <strong>topographic surveys<\/strong> of the terrain are carried out accurately, using instruments such as theodolites, laser levels, GPS, and drones.<\/p>\n<p>The collected data is processed to create the <strong>topographic map<\/strong>, taking into account contour lines, control points, and existing structural elements.<\/p>\n<p>A critical step is the <strong>quality control phase<\/strong>, which aims to identify and correct any measurement errors, inconsistencies between points, georeferencing issues, or inconsistencies in the delivery.<\/p>\n<p>Accuracy is essential to ensure that the Topographic Survey is reliable and usable in the subsequent phases of planning, computation, authorization, or construction.<\/p>\n<h2 id=\"methods-of-topographic-surveying-used-in-modern-survey-projects\">Methods of topographic surveying used in modern survey projects<\/h2>\n<p>The topographic survey is the necessary basis for creating a coherent and reliable Topographic Survey. It allows for precisely determining the <strong>location of points on the earth&#8217;s surface<\/strong> through the measurement of <strong>planimetric coordinates (X, Y)<\/strong> and <strong>altimetric coordinates (Z)<\/strong>.<\/p>\n<p>Topographic surveying is distinguished into:<\/p>\n<ul>\n<li><strong>planimetric survey<\/strong>, which determines the position of points in the horizontal plane through coordinates X and Y. It is used to define the shape and dimensions of an area viewed from above;<\/li>\n<li><strong>altimetric survey<\/strong>, which records the elevations of points, that is, the height with respect to a reference plane, generally sea level. It serves to describe the vertical configuration of the terrain, such as changes in elevation, slopes, or heights;<\/li>\n<li><strong>topographic survey<\/strong>, which combines the previous two types, providing both the planimetric position and the altimetric elevation of the points. It is the most complete form of surveying and the most used in the construction, infrastructure, and environmental sectors.<\/li>\n<\/ul>\n<p>Among the instruments used today for topographic surveying are:<\/p>\n<ul>\n<li><strong>Imaging total stations<\/strong>, which combine the measurement of angles and distances with high-resolution images;<\/li>\n<li><strong>drones<\/strong>, which allow for the rapid acquisition of high-resolution images over large areas, transforming them into 3D point clouds, orthophoto maps, and digital terrain models through photogrammetry;<\/li>\n<li><strong>RTK GNSS systems<\/strong>, which enable the determination of the position of points with centimeter-level accuracy;<\/li>\n<li><strong>LiDAR systems<\/strong>, which produce dense and detailed point clouds useful for capturing the geometry of terrains, buildings, infrastructures, or archaeological sites;<\/li>\n<li><strong>Mobile Mapping Systems (MMS)<\/strong>, which integrate sensors on moving vehicles to acquire high-precision 3D data along roads, infrastructures, and urban contexts.<\/li>\n<\/ul>\n<h2 id=\"aerial-topographic-survey-for-large-infrastructure-projects\">Aerial topographic survey for large infrastructure projects<\/h2>\n<p>The aerial topographic survey for large infrastructure projects is generally carried out with <strong>drones<\/strong>, especially when data needs to be acquired over extensive, difficult-to-reach areas or characterized by complex morphologies.<\/p>\n<p>The survey is based on data acquisition through aerial photogrammetry. Drones, equipped with high-resolution sensors and cameras, fly over the area to be surveyed and capture numerous overlapping images of the area of interest.<\/p>\n<p>These images are then processed with specific software to create <strong>orthophotos<\/strong>, <strong>point clouds<\/strong>, <strong>3D models<\/strong>, and <strong>digital terrain models<\/strong>.<\/p>\n<p>Thanks to the use of drones, it is possible to map even large terrains, achieving an accurate survey both in detail and in measurements.<\/p>\n<p>&nbsp;<\/p>\n<h3>Advantages and practical applications of topographic surveying with drones<\/h3>\n<p>Topographic surveying with drones offers numerous advantages over conventional surveying methods, especially when data needs to be rapidly acquired over large or difficult-to-access areas.<\/p>\n<p>The main advantages are:<\/p>\n<ul>\n<li><strong>speed of acquisition<\/strong>: an area of several hectares can be surveyed in reduced time;<\/li>\n<li><strong>greater efficiency:<\/strong> covering large areas quickly reduces the overall survey execution time;<\/li>\n<li><strong>greater safety:<\/strong> reduces interventions at height and access to hazardous areas;<\/li>\n<li><strong>high precision:<\/strong> thanks to GCP (Ground Control Points) and state-of-the-art sensors, it is possible to achieve centimeter-level discrepancies in suitable operational conditions;<\/li>\n<li><strong>operational flexibility:<\/strong> drones can adapt to urban, agricultural, industrial, natural, and historical contexts.<\/li>\n<\/ul>\n<p>Topographic surveying with drones is applied in many sectors, including:<\/p>\n<ul>\n<li><strong>construction and infrastructure:<\/strong> drones are used to map terrain, monitor construction sites, and verify compliance of works with project specifications;<\/li>\n<li><strong>precision agriculture:<\/strong> the drone can collect data useful for crop analysis, monitoring plant health, and optimizing resource management;<\/li>\n<li><strong>urban planning:<\/strong> drones provide a complete and detailed view of the territory, useful for planning urban development and monitoring existing infrastructures;<\/li>\n<li><strong>environment and risk monitoring:<\/strong> drones can be used to map areas prone to landslides, floods, or other natural hazards, enabling safer monitoring of environmental conditions.<\/li>\n<\/ul>\n<h2 id=\"equipment-and-technologies-for-topographic-survey\">Equipment and Technologies for Topographic Survey<\/h2>\n<p>The <strong>GPS<\/strong>, Global Positioning System, is the global satellite positioning system developed by the United States and is still widely used today for geolocation services.<\/p>\n<p>However, GPS is not the only existing satellite positioning system. There are indeed other global or regional systems, including:<\/p>\n<ul>\n<li>GLONASS developed by Russia;<\/li>\n<li>BEIDOU or COMPASS developed by China;<\/li>\n<li>IRNSS developed by India;<\/li>\n<li>QZSS developed by Japan;<\/li>\n<li>Galileo, the European satellite navigation system;<\/li>\n<li>European SBAS systems, such as EGNOS, used to improve the accuracy and reliability of positioning.<\/li>\n<\/ul>\n<p>Since GPS is not the only system that can be used, it is more correct in technical terms to talk about <strong>GNSS, which stands for Global Navigation Satellite System.<\/strong><\/p>\n<p>GNSS systems, through suitable receivers, allow determining the <strong>position of points on the earth&#8217;s surface<\/strong> and can provide information on <strong>coordinates<\/strong>, <strong>elevation<\/strong>, <strong>speed<\/strong>, and <strong>time<\/strong>.<\/p>\n<p>But how does a GNSS survey work? In general, a mobile receiver (Rover) receives signals from multiple satellites and calculates its position based on the signal travel time. To achieve high precision, especially in the topographic field, differential corrections, ground-based stations, or networks of permanent stations are often used.<\/p>\n<p>To carry out a GNSS survey, there are several positioning methods:<\/p>\n<ul>\n<li><strong>absolute positioning<\/strong>, using a single receiver, relying solely on the signals sent by the satellites;<\/li>\n<li><strong>relative positioning<\/strong>, utilizing various receivers and being able to determine the relative position, i.e., the difference between the coordinates of the receivers themselves;<\/li>\n<li><strong>differential positioning<\/strong>, performed with a mobile receiver that utilizes both satellite signals and correction data from reference ground stations, thus increasing the level of positioning accuracy;<\/li>\n<li><strong>static positioning<\/strong>, where one or more receivers remain stationary on the points to be determined for a certain period of time. The data are then processed, often in post-processing, to obtain high-precision coordinates;<\/li>\n<li><strong>kinematic positioning<\/strong>, utilizing dynamic GNSS networks, i.e., permanent stations that operate 24\/7, which employ RTK network or NRTK techniques. In this case, the operator sends its position to the permanent GNSS station and receives a correction message in return. This is a very precise positioning that requires only a modem and a dual-frequency receiver.<\/li>\n<\/ul>\n<h2 id=\"workflow-for-topographic-surveying-and-mapping\">Workflow for Topographic Surveying and Mapping<\/h2>\n<p>The workflow for topographic surveying and mapping is a structured process that <strong>transforms physical measurements<\/strong> and <strong>collected information<\/strong> into digital or paper graphic representations.<\/p>\n<p>The workflow for topographic surveying and mapping consists of the following phases:<\/p>\n<ul>\n<li><strong>preparation phase<\/strong>, during which document, cadastral, and cartographic research on the area to be surveyed is conducted and the type of instrumentation to be used is selected;<\/li>\n<li><strong>field survey phase<\/strong>, which involves data acquisition through total station, GNSS, drone, laser scanner, or other topographic instruments;<\/li>\n<li><strong>data processing phase<\/strong>, during which raw data downloaded from the instruments are processed using topographic, GIS, or BIM software;<\/li>\n<li><strong>final output phase<\/strong>, which consists of producing 3D models, dimensions, plano-altimetric elaborations, orthophotos, profiles, sections, or digital terrain models.<\/li>\n<\/ul>\n<div id=\"attachment_40705\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-40705\" class=\"size-full wp-image-40705 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2026\/05\/Workflow-for-topographic-surveying-and-mapping.jpg\" alt=\"Workflow for topographic surveying and mapping\" width=\"800\" height=\"600\" \/><p id=\"caption-attachment-40705\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-40705 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2026\/05\/Workflow-for-topographic-surveying-and-mapping.jpg\" alt=\"Workflow for topographic surveying and mapping\" width=\"800\" height=\"600\" \/><\/noscript> Workflow for topographic surveying and mapping<\/p><\/div>\n<h2 id=\"how-topographic-surveys-support-bim-and-digital-terrain-models\">How Topographic Surveys Support BIM and Digital Terrain Models<\/h2>\n<p>The topographic survey is the foundation for precise and detailed design in the construction sector.<\/p>\n<p><strong>Topography<\/strong> and <strong>BIM<\/strong> work together to provide an accurate three-dimensional view of the site.<\/p>\n<p><strong>Topographic data<\/strong> provides essential information about the terrain, such as slopes, elevations, differences in height, access points and morphological constraints, which are fundamental for assessing project feasibility and adapting structures to environmental conditions.<\/p>\n<p>Tools such as <strong>3D laser scanners<\/strong>, <strong>drones with LiDAR technology<\/strong>, <strong>total stations<\/strong> and <strong>GNSS systems<\/strong> allow for the acquisition of extremely detailed geospatial data, ready to be processed in <a class=\"textualLink_software-bim\" href=\"https:\/\/www.accasoftware.com\/en\/bim-software\" target=\"_blank\" rel=\"noopener\">BIM software<\/a>.<\/p>\n<p>The result is an <strong>accurate<\/strong> and <strong>complete digital model<\/strong>, useful for planning and implementing sustainable, safe, and efficient projects.<\/p>\n<p>The integration of topographic surveys into BIM models enables:<\/p>\n<ul>\n<li><strong>greater precision<\/strong>, because high-definition topographic data increases the quality and reliability of BIM models, reducing the risk of design errors or on-site interferences;<\/li>\n<li><strong>greater efficiency<\/strong>, because digital survey technologies allow for the rapid acquisition of detailed information, speeding up the design phase and optimizing execution times;<\/li>\n<li><strong>advanced geospatial analysis and simulations<\/strong>, as the integration of topographic data allows for hydrological simulations, environmental impact studies, ground stability assessments, and earth movement planning directly on the BIM model;<\/li>\n<li><strong>complete lifecycle management of the project<\/strong>, because the data obtained from surveys is useful not only during the design or construction phase but also for maintenance, monitoring, and long-term management of the infrastructure.<\/li>\n<\/ul>\n<h2 id=\"software-for-topographic-surveying-terrain-modeling-and-data-processing\">Software for Topographic Surveying, Terrain Modeling, and Data Processing<\/h2>\n<p>With <a class=\"textualLink_edificius-progettazione-esterna\" href=\"https:\/\/www.accasoftware.com\/en\/3d-terrain-modeling-software\" target=\"_blank\" rel=\"noopener\">3D terrain modeling software<\/a>, you can create a Digital Terrain Model (DTM), starting from surveys in various formats such as IFC, DWG, DXF, or even directly from Google Maps\u00ae; this way, you obtain a detailed and accurate DTM in no time.<\/p>\n<p>With these tools, you can easily <a href=\"https:\/\/biblus.accasoftware.com\/en\/modelling-a-3d-terrain-with-countour-lines\/\" target=\"_blank\" rel=\"noopener\">model the terrain using contour lines<\/a>, spot elevations, and three-dimensional surfaces, digitally representing the real morphology of the project area.<\/p>\n<p>You can <a href=\"https:\/\/biblus.accasoftware.com\/en\/earthwork-modelling-with-a-bim-software\/\" target=\"_blank\" rel=\"noopener\">simulate excavation and filling operations<\/a>, compare different solutions and project levels, and integrate the model with landscape elements. Additionally, you can achieve realistic three-dimensional representations of the terrain thanks to integrated rendering features and produce project documents, graphics, 3D representations, and quantity takeoffs for the various operational phases.<\/p>\n<p>If you need to conduct a topographic survey and model the terrain in a BIM environment, you can try the 3D terrain modeling features of <a class=\"textualLink_edificius-progettazione-esterna\" href=\"https:\/\/www.accasoftware.com\/en\/3d-terrain-modeling-software\" target=\"_blank\" rel=\"noopener\">Edificius<\/a> for free!<\/p>\n<div id=\"attachment_30141\" style=\"width: 910px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-30141\" class=\"wp-image-30141 size-full lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2023\/11\/Graphical-terrain-modelling.jpg\" alt=\"Terrain Modeling - Topographic Survey\" width=\"900\" height=\"506\" \/><p id=\"caption-attachment-30141\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"wp-image-30141 size-full lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2023\/11\/Graphical-terrain-modelling.jpg\" alt=\"Terrain Modeling - Topographic Survey\" width=\"900\" height=\"506\" \/><\/noscript> Terrain Modeling &#8211; Topographic Survey<\/p><\/div>\n<h3>What is a Digital Terrain Model (DTM)?<\/h3>\n<p>A Digital Terrain Model, or DTM, is a three-dimensional digital representation of the ground surface, devoid of the elements that are located above it, such as buildings, trees, or infrastructure.<\/p>\n<p>The data used to generate a DTM can come from various sources, such as photogrammetry, satellite images, surveys in formats like <strong>IFC<\/strong>, <strong>DWG<\/strong>, and <strong>DXF<\/strong> or directly from <strong>Google Maps<sup>\u00ae<\/sup><\/strong>. Once processed, this data allows for the creation of a 3D model useful for land analysis, design, earthworks, and integration with BIM models.<\/p>\n<h3>What is the difference between DTM, DSM, and DEM?<\/h3>\n<p>DEM is used as a general term to refer to a digital elevation model. The DTM represents the ground without above-ground elements, while the DSM represents the surface including buildings, vegetation, infrastructure, and other objects present above the ground.<\/p>\n<h2 id=\"video\">Video<\/h2>\n<p>In this video, you can see how to automatically obtain elevation data and textures from a simple selection in Google Maps<sup>\u00ae<\/sup> to quickly create the digital terrain model thanks to the integration between BIM and Google Maps<sup>\u00ae<\/sup> by <a class=\"textualLink_usbim-land\" href=\"https:\/\/www.accasoftware.com\/en\/bim-google-maps\" target=\"_blank\" rel=\"noopener\">usBIM.land<\/a>.<\/p>\n<div class='avia-iframe-wrap'><iframe title=\"BIM Google maps\u00ae | usBIM.land | ACCA software\" width=\"1500\" height=\"844\" src=\"https:\/\/www.youtube.com\/embed\/QljTFwqeN34?feature=oembed&#038;enablejsapi=1\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<h2 id=\"faq\">FAQ<\/h2>\n<h3>What is planoaltimetry?<\/h3>\n<p>Planoaltimetry is a technical representation of an area that integrates planimetric information, that is, position and dimensions on the horizontal plane, and altimetric information, that is, elevations, height differences, and slopes.<\/p>\n<h3>What is a planoaltimetric survey used for?<\/h3>\n<p>A planoaltimetric survey is used to understand the shape of the terrain, the position of existing elements, and the elevations of the surveyed points. It is used for designing buildings, roads, infrastructure, urbanization works, earthworks, and digital terrain models.<\/p>\n<h3>What is the difference between planimetry and planoaltimetry?<\/h3>\n<p>Planimetry represents the elements on the horizontal plane, while planoaltimetry also adds information on the elevations and height differences of the terrain.<\/p>\n<h3>What tools are used for planoaltimetry?<\/h3>\n<p>The most commonly used tools are total stations, GNSS receivers, drones, laser scanners, LiDAR systems, and topographic or BIM software for processing and delivering data.<\/p>\n<h3>Are data obtained from online maps sufficient for an executive project?<\/h3>\n<p>Data obtained from online maps can be useful for preliminary studies or context modeling, but for executive projects, it is necessary to use professional, accurate, and georeferenced topographic surveys.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"international-product-banner-desktop\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=\"https:\/\/www.accasoftware.com\/en\/bim-management-system\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/usbim-en.jpg\" alt=\"usbim\" width=\"728\" height=\"160\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/usbim-en.jpg\" alt=\"usbim\" width=\"728\" height=\"160\" \/><\/noscript><\/a><\/div>\n<div class=\"international-product-banner-mobile\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=\"https:\/\/www.accasoftware.com\/en\/bim-management-system\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/usbim-en.jpg\" alt=\"usbim\" width=\"600\" height=\"500\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/usbim-en.jpg\" alt=\"usbim\" width=\"600\" height=\"500\" \/><\/noscript><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The importance of Topographic Survey in the design of buildings and infrastructures: the topographic survey<\/p>\n","protected":false},"author":32,"featured_media":50965,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_data_scadenza_evento":"","_evento_nome":"","_evento_data":"","_evento_luogo":"","_evento_cta":"","keyword_en":"Topographic Survey","keyword_es":"","keyword_fr":"","keyword_de":"","keyword_ptb":"","_note_content":"","footnotes":""},"categories":[5131],"tags":[5116,5272],"class_list":["post-30137","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bim-and-training","tag-newsletter-315","tag-newsletter-446"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - 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