Name: reading terrain with topographic maps
Uploaded: 2025-03-26T15:22:07.000Z
Duration: 1 min 29 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

North Carolina K-12 Science Standard Course of Study

9-12

Earth and Environmental Science

Earth's Systems

ESS.EES.2.3

Topographic Surveying and Contours

يرسم المسح الطبوغرافي خرائط لسطح الأرض ويلتقط الارتفاعات والمنحدرات والميزات الطبيعية أو من صنع الإنسان.  إنه أمر بالغ الأهمية لتخطيط البناء وإدارة المياه وتحليل استخدام الأراضي. الناتج الرئيسي هو خريطة طبوغرافية تمثل التضاريس باستخدام خطوط كفافية. الخطوط العريضة هي خطوط تربط بين النقاط المتساوية في الارتفاع، وتصف بصريا شكل التضاريس وانحدارها. تشير الخطوط المتقاربة إلى مناطق شديدة الانحدار، بينما يمثل التباعد الأوسع تضاريس ضحلة أكثر.  يعتمد التباعد الرأسي بين خطوط الكنتور، والذي يسمى الفاصل الزمني المحيطي، على الغرض من الخريطة وتضاريس المنطقة.  على سبيل المثال، قد تستخدم المناطق المسطحة فاصلا صغيرا ، مثل 0.6 متر ، بينما قد تستخدم المناطق الجبلية 30 مترا. تقوم الأدوات الحديثة مثل GPS والمحطات الإجمالية بجمع بيانات الارتفاع بكفاءة ودقة. يستخدم المساحون هذه البيانات لرسم النقاط وإنشاء خرائط كفافية ، والتي تكشف عن التضاريس الأرضية المهمة مثل الوديان والتلال والهضاب.  يوجه التباعد ونمط الخطوط البناء والزراعة والتخطيط البيئي ، مما يجعل المسح الطبوغرافي أداة لا غنى عنها في إدارة الأراضي والمشاريع الهندسية.

المسح الطبوغرافي والخطوط

يعد المسح الطبوغرافي أمرا بالغ الأهمية لتوثيق سطح الأرض ، مع التركيز على التقاط الارتفاعات والمنحدرات والميزات الطبيعية والاصطناعية. إنه ضروري في تخطيط البناء وإدارة الموارد المائية وتحليل استخدام الأراضي. النتيجة الأولية لمثل هذه المسوحات هي خريطة طبوغرافية ، والتي تستخدم الخطوط الكنتورية لتمثيل شكل ومنحدر التضاريس بصريا ، مما يوفر رؤى قيمة حول خصائص المناظر الطبيعية. تعتبر الخطوط الكنتورية أساسية لفهم التضاريس لأنها تربط النقاط ذات الارتفاع المتساوي ، وتشكل وصفا مرئيا لتضاريس الأرض. ينقل التباعد بين هذه الخطوط انحدار المنطقة ، حيث تشير الخطوط المتقاربة إلى منحدرات شديدة الانحدار وتباعد أوسع يمثل مناطق مسطحة. يختلف الاختلاف الرأسي بين خطوط الكنتور، المعروفة باسم الفاصل الزمني الكنتوري، اعتمادا على الغرض المقصود من الخريطة وتضاريس المنطقة. على سبيل المثال ، قد تستخدم المناطق المسطحة فاصلا كنتوريا أصغر ، مثل قدمين ، من أجل الدقة ، بينما قد تتبنى المناطق الجبلية فترات 100 قدم أو أكثر لتقليل الفوضى. تستخدم طرق المسح الحديثة أدوات متقدمة مثل نظام تحديد المواقع العالمي (GPS) والمحطات الإجمالية ، مما يحسن بشكل كبير من دقة وكفاءة جمع بيانات الارتفاع. تمكن هذه الأدوات المساحين من رسم نقاط دقيقة تستخدم لاحقا لإنشاء خطوط كنتورية على الخريطة. تكشف الخرائط الطبوغرافية الناتجة عن التضاريس الرئيسية ، بما في ذلك الوديان والتلال والهضاب ، والتي تعتبر ضرورية لفهم المناظر الطبيعية. لا غنى عن الخرائط الطبوغرافية عبر تخصصات متعددة. في البناء ، يوجهون القرارات المتعلقة بملاءمة التضاريس وتصميم الأساسات. في الزراعة ، تساعد في تحسين أنظمة الري وإدارة تصريف التربة. يستخدم المخططون البيئيون هذه الخرائط لتحديد المناطق المعرضة للفيضانات ومراقبة تغيرات التضاريس. المعلومات التفصيلية التي يوفرها المسح الطبوغرافي تجعله أداة أساسية في ممارسات الهندسة والإدارة المستدامة للأراضي.

Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is ...

Education

JoVE Core

Civil Engineering

الهندسة المدنية

Unit 1

الوحدة الأولى

Traverse and Topographic Surveying

المسح الترافرسي والطبوغرافي

KEY TERMS AND CONCEPTS

المصطلحات والمفاهيم الأساسية

reading terrain with topographic maps

Topographic surveying records the shape of land by measuring elevation, slope, and natural and man-made features. Surveyors use these measurements to build a topographic map, which shows the terrain in a visual way. These maps are important for construction planning, water resource management, and land-use analysis.

Contour lines are the key feature of a topographic map. A contour line connects points with the same elevation, so it helps show the relief of the land. The spacing between contour lines shows slope. Lines that are close together mark steep ground, while lines that are farther apart show flatter areas.

The contour interval is the vertical difference between contour lines. It changes based on the purpose of the map and the shape of the region. Flatter land may use a small interval, such as 2 feet, for more detail. Mountain areas may use intervals of 100 feet or more to keep the map clear.

Modern surveying uses tools such as GPS and total stations to collect elevation data with greater accuracy and speed. Surveyors plot these points and later connect them to form contour lines. The finished map can reveal valleys, ridges, and plateaus, which help people understand the landscape.

Topographic maps are useful in many fields. In construction, they help judge whether land is suitable and support foundation design. In agriculture, they can guide irrigation systems and help manage soil drainage. Environmental planners also use them to find flood-prone areas and track changes in landforms. This makes topographic surveying a key tool in engineering and sustainable land management.

Reading Terrain with Topographic Maps

adjusting a traverse

Correcting Traverse Angle Errors

Correcting traverse angle errors is an important step in site surveying. In a four-sided traverse, the internal angles must add up to 360 degrees. Survey data first showed a total of 359 degrees and 48 minutes, which was 12 minutes short of the expected sum. That gap pointed to a likely measurement error from fieldwork. The correction was made by spreading the 12-minute shortfall evenly across the four internal angles. Three minutes were added to each angle, and the values were recalculated.

latitudes and departures

Balancing Traverse Latitude and Departure

Latitudes and departures are key parts of surveying that help break a traverse line into north-south and east-west parts. These projections let surveyors work with line direction, length, bearings, and area in a clear way. They are also useful for measuring and mapping land accurately. Latitude is the north-south projection of a line. It is found by multiplying the line length by the cosine of its bearing. Departure is the east-west projection. It is found by multiplying the line length by the...

area computation by the alternative coordinate method

area-computation-by-the-alternative-coordinate-method

Shoelace Formula for Traverse Area

The Shoelace Formula is a coordinate method for finding the area of a traverse. It uses Cartesian coordinates, which are x and y values on a graph, to measure the shape accurately and with a simple step-by-step setup. The points of the traverse are listed in order around the shape. Each corner is written as a fraction, with the x-coordinate on top and the y-coordinate on the bottom. The first corner is repeated at the end of the list to close the shape. Next, diagonal lines are used to...

areas within irregular boundaries

Measuring Irregular Land Areas

Measuring irregular land areas often starts with a traverse. A traverse is a connected series of straight lines that follows the boundary as closely as possible. Surveyors use the coordinates of each traverse point to help calculate the enclosed area. One common method is the double meridian distance formula. It uses the vertex coordinates of the traverse to find the area inside the straight-line boundary. This gives a practical base for later calculations. The space between the traverse and...

design example: marking boundaries of a site using a compass

design-example-marking-boundaries-of-a-site-using-a-compass

Compass Traverse for Site Boundary Marking

Marking a site boundary with a compass uses a traverse, which is a line-by-line surveying path. The method relies on the bearings and lengths of each boundary side. It helps surveyors place corner points with accuracy. The process begins with the site details. These include the bearing and length of every boundary line. Surveyors first calculate the latitude and departure of each side. Latitude is the north-south part of a line, and departure is the east-west part. This check shows whether the...

topographic surveying and contours

Topographic surveying records the shape of land by measuring elevation, slope, and natural and man-made features. Surveyors use these measurements to build a topographic map, which shows the terrain in a visual way. These maps are important for construction planning, water resource management, and land-use analysis. Contour lines are the key feature of a topographic map. A contour line connects points with the same elevation, so it helps show the relief of the land. The spacing between contour...

plotting of topographic maps

Drawing Contour Lines from Elevation Data

Topographic maps use contour lines to show the shape of the land from elevation data. A contour line connects points with the same elevation. This makes a two-dimensional map that shows three-dimensional terrain in a clear way. To build the map, start with a scaled grid. Mark the intersections that match the survey’s elevation data points. Then assign elevation values at those points to create the base map. Next, choose a contour interval, which is the vertical change between contour lines.

methods of obtaining topography

Topographic Surveying: Old and New Methods

Topographic surveying uses land measurements to map elevations, natural features, and artificial structures. The goal is to create an accurate picture of the terrain. Surveyors have used both traditional and modern methods to do this work, and each approach has its own strengths and limits. Traditional surveying methods included transit stadia surveys and plane table surveys. These methods used tools such as theodolites and stadia rods to measure distances and angles. Surveyors then wrote the...

design example: analyzing capacity contours for flood risk assessment

design-example-analyzing-capacity-contours-for-flood-risk-assessment

Setting Bund Height to Reduce Flood Risk

Capacity contours help engineers check flood risk when a bund is built across a small valley. A bund is a raised barrier used here to store stormwater. The contour map shows how far water could spread at a chosen level, which helps judge whether nearby homes are safe. The process starts by placing the proposed bund in the valley and estimating the high flood level. Engineers then use leveling instruments to find and mark points along the upstream side that match this water level. Those points...

key terms and concepts

Learn how topographic surveys use contour lines, contour intervals, GPS, and total stations to map slopes, landforms, and terrain for real-world planning.

Reading Terrain with Topographic Maps | JoVE K12

JoVE Core Civil Engineering provides a foundational exploration of essential construction materials in civil engineering, focusing on bricks, stones, steel, wood, and concrete through easy-to-understand animated videos. This collection covers the properties, manufacturing processes, and practical applications of these materials. Additionally, the accompanied science-in-action videos demonstrate the research experiments performed in laboratories.

civil engineering

Igneous Volcanic Rock

Source: Laboratory of Alan Lester - University of Colorado Boulder
Igneous rocks are the products of cooling and crystallization of magma. Volcanic rocks ...

The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among ...

Igneous Intrusive Rock

Source: Laboratory of Alan Lester - University of Colorado Boulder
Igneous rocks are products of the cooling and crystallization of high temperature ...

using-topographic-maps-to-generate-topographic-profiles

Using Topographic Maps to Generate Topographic Profiles

Source: Laboratory of Alan Lester - University of Colorado Boulder
Topographic maps are &#34;plan-view&#34; representations of Earth&#39;s ...

determining-spatial-orientation-rock-layers-with-brunton

Determining Spatial Orientation of Rock Layers with the Brunton Compass

Source: Laboratory of Alan Lester - University of Colorado Boulder
Most rock units exhibit some form of planar surfaces or linear features. Examples ...

Making a Geologic Cross Section

Source: Laboratory of Alan Lester - University of Colorado Boulder
Geologic maps were first made and utilized in Europe, in the mid-to-late 18th century. ...

Use models to explain how mantle convection powers plate tectonics.

ESS.EES.2.1

Analyze and interpret data to predict locations of volcanoes and earthquakes based on plate boundaries.

ESS.EES.2.2

an-overview-of-alkenone-biomarker-analysis-for-paleothermometry

An Overview of Alkenone Biomarker Analysis for Paleothermometry

Source: Laboratory of Jeff Salacup&#160;- University of Massachusetts Amherst
Throughout this series of videos, natural samples were extracted and ...

Plotting of Topographic Maps

Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional ...

Methods of Obtaining Topography

Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. ...

Use models to explain how plate tectonics influence topography.

The Soil Ecosystem

Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not ...

Conditions on Early Earth

What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited ...

The Water Cycle

The Earth&rsquo;s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, ...

The Nitrogen Cycle

Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of ...

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, ...

The Sulfur Cycle

Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the ...

Bioremediation

Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins ...

Carry out investigations to explain how the rock cycle and rates of weathering, erosion, and soil formation influence Earth's systems.

ESS.EES.2.4

What is Climate?

Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, &#8220;Climate is what you expect. ...

What is Weather?

Overview

Weather refers to the current state of atmospheric conditions at a specific time and place. Weather is temporary and is influenced by the ...

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the ...

/files/media/science-education/science-education-thumbs/14711.jpg

Analyze and interpret data to explain how volcanic activity influences changes in Earth's atmosphere, geosphere, biosphere, and hydrosphere.

ESS.EES.2.5

States of Water

Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the ...

The potential of hydrogen (pH) is a measure of the acidity or basicity of a water-based solution determined by the concentration of hydronium ions (H3O+). ...

Solvents

A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent ...

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another ...

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such ...

Cohesion

Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar ...

Specific Heat

The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. ...

Vaporization

The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize ...

Role of Water in Human Biology

Water is the one of the most significant components of the human body; it plays a crucial role in several physiological activities because of its unique ...

solubility-equilibria-ionic-product-of-water

Solubility Equilibria: Ionic Product of Water

Water is a weak electrolyte and undergoes a small amount of self-ionization.
At any given temperature, the concentration of undissociated water is ...

Carry out investigations to explain the properties of water.

ESS.EES.3.1

Energy

The universe is composed of matter in different forms, and all forms of matter contain energy.&#160; The different forms of energy on Earth originate from ...

Energy Basics

Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter.

Chemical changes and their accompanying ...

Climate Change

The certainty of climate change remains a public controversy despite the consensus among approximately 97% of active climate researchers, who not only ...

Enthalpy

Source: Ketron Mitchell-Wynne, PhD,&#160;Asantha Cooray, PhD, Department of Physics &#38; Astronomy, School of Physical Sciences, University of ...

Mechanism of heat transfer

Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the ...

Use models to explain how water is an agent of energy transfer.

ESS.EES.3.2

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global ...

Measuring Tropospheric Ozone

Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University
Ozone is a form of elemental oxygen (O3), a molecule of three oxygen atoms ...

an-overview-of-bgdgt-biomarker-analysis-for-paleoclimatology

An Overview of bGDGT Biomarker Analysis for Paleoclimatology

measurement-greenhouse-gas-flux-from-agricultural-soils-using-static

Measurement of Greenhouse Gas Flux from Agricultural Soils Using Static Chambers

Measurement of greenhouse gas (GHG) fluxes between the soil and the atmosphere, in both managed and unmanaged ecosystems, is critical to understanding the ...

Analyze and interpret data to explain how major greenhouse gases influence climate.

ESS.EES.3.3

Mechanisms of Heat Transfer II

In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the ...

Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives ...

Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as ...

Analyze and interpret data to attribute how atmospheric composition and surface conditions influence heat retention in the troposphere.

ESS.EES.3.4

using-generative-art-to-convey-past-and-future-climate-transitions

Using Generative Art to Convey Past and Future Climate Transitions

The ability to understand modern day climate relies on a foundational understanding of past climate variability and the ways in which the planet is ...

Construct an explanation to conclude that heat exchange between the ocean and atmosphere results in local, regional, global weather phenomena, and climate patterns.

ESS.EES.3.5

What is an Ecosystem?

Overview

An ecosystem is the interaction between all abiotic and biotic factors in an environment and can be classified as terrestrial or aquatic. ...

Symbiosis

Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those ...

Community Diversity

Populations do not live in isolation; thus, every population interacts with others in certain ways. These interactions give rise to a network of ...

Species Distribution and Biogeography

Species Distribution

Biogeography is the study of species distribution across geographic space and the processes that shape these distributions. This ...

Ecological Niches

All organisms have a position within an ecosystem. The complete set of living and nonliving factors&#x2014;including food resources, climate, and ...

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced ...

Use models to explain how abiotic/biotic interactions shape various ecosystems.

ESS.EES.4.1

Carbon-dioxide Fixation

Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ...

carbon-and-nitrogen-analysis-of-environmental-samples

Carbon and Nitrogen Analysis of Environmental Samples

Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University
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Energy Dynamics

The Food Chain
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Environmental Applications of Microorganisms

Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as ...

Analyze and interpret data to explain how carbon cycling influences various ecosystems.

ESS.EES.4.2

Analyze and interpret data to explain past climate trends.

ESS.EES.4.3

What is Biodiversity?

Biodiversity describes the variety of living things at multiple organizational levels: genetic, species and ecosystem diversity. Species diversity ...

Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species ...

Construct an explanation to predict how potential future changes in abiotic factors could impact biodiversity and species distribution.

ESS.EES.4.4

Analyze how the geosphere is shaped by plate tectonics and the rock cycle.

Reading Terrain with Topographic Maps

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