What Is Difference Between If And If
An ?else if? block leads to a further level of nesting. In case the ?if? condition is false, then the ?else if? condition is evaluated in a sequential manner till a match is found. In case all conditions fail, then the action defined in the ?else? clause is executed. The ?if? condition remains the same.
What Is Else If Ladder Statement In C
In C/C++ if-else-if ladder helps user decide from among multiple options. As soon as one of the conditions controlling the if is true, the statement associated with that if is executed, and the rest of the C else-if ladder is bypassed. If none of the conditions is true, then the final else statement will be executed.
What Is The Study Of Geography About
Geography is the study of places and the relationships between people and their environments. Geographers explore both the physical properties of Earth’s surface and the human societies spread across it. … Geography seeks to understand where things are found, why they are there, and how they develop and change over time.
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True Versus Absolute Altitude
In aviation, there are five types of altitude. Two of the types are true altitude and absolute altitude.
As with the geography term altitude, true altitude is the altitude the airplane above mean sea level. True altitude is expressed as the distance above mean sea level .
Absolute altitude is the distance between the airplane and the height of the ground below the airplane. Absolute altitude is expressed as the distance above ground level .
How Is Elevation Measured
Elevation is measured using standard imperial or metric units of measure, as well as angles. Although it may seem to be an easy task, measuring the height of physical features such as mountains and the depth of valleys can be challenging and involves the use of modern technology and mathematical calculations. The height of a mountain is measured by placing GPS equipment on the peak and then using satellite to determine the elevation from the ground and the sea level. Measuring depth is even more challenging because it involves the use of sonar and radar technology.
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How Is Elevation Calculated
In 2015, North Americas tallest mountain, Mount McKinley, got a new name: Denali. But that change did not come in solitary. The US Geological Survey announced that it was shaving 10 feet off Denalis highest point to set its new elevation at 20,310 feet .
Global Position System equipment being set up at Denalis highest point for precise summit elevation data. Credit: Blaine Horner/CompassData
Formerly, elevation used to be calculated using mathematical formulas of trigonometry. The horizontal distance between the two points and the vertical angle measured between them would yield the elevation of the object. Denalis earlier elevation, meanwhile, was determined by a more advanced method of taking aerial radar measurements. But clearly, even that technique was not sufficient.
Today, modern GPS techniques are used to determine the elevation of a place. Just like you need three satellites to triangulate your precise position on Earth, adding a fourth one to the mix will give you the height of that location.
But, in reality, this is not as simple as it sounds. Even GPS receivers can give you varied elevation results based on the baseline they are referencing to. Since the Earths surface is not consistent, scientists have developed various theoretical models called vertical datums to represent the shape of our planet. Heres an article that gives a wonderful explanation of how different datums can give different elevation results.
How Do You Explain Elevation
An elevation is a rise or the raising of something. Mountains have an elevation based on how high they are and your mood has an elevation as you get happier. Elevation is a noun that tells how high something is raised above a surface or ground line. Its also a term for measuring things like temperatures or degrees.
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How Do You Read Spot Elevation
Run the detector and / or front rod section up or down until you pick up the on grade signal from your detector. Read the number opposite the pointer. That number is your true elevation. If using an optical instrument, just read the number across the horizontal line.
Which interpolation method is best for elevation?
Today, perhaps the most widely used technique for interpolating elevation from contours is Hutchinsons ANUDEM algorithm, which can be used in the ArcGIS system via the TOPO TO RASTER command. This interpolation method not only uses contours, but also uses surface drainage lines such as streams and rivers.
How do you interpolate a slope?
Know the formula for the linear interpolation process. The formula is y = y1 + / ) * , where x is the known value, y is the unknown value, x1 and y1 are the coordinates that are below the known x value, and x2 and y2 are the coordinates that are above the x value.
What Is An Example Of Population Geography
Population geography is a division of human geography. … It focuses on the characteristics of population distributions that change in a spatial context. Examples can be shown through population density maps. A few types of maps that show the spatial layout of population are choropleth, isoline, and dot maps.
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What Is A Spot Elevation In Geography
A spot elevation is a point on a map that identifies the height above mean sea level. Spot elevations tell you the actual elevation of a particular point, both existing and proposed, which can be used for planning purposes and for creating 3D models.
What is a spot elevation?
A spot elevation displays the actual elevation of a selected point. Use spot elevations to obtain points of elevation for ramps, roads, toposurfaces, and stair landings.
How do you add spot elevations?
Start adding your spot elevation at the plan by going to Annotate tab > add labels > surface > add surface labels. Choose your label type Spot elevation and your label style One Spot To All . and click add.
Examples Of Topography In Maps
Theres no world authority in topographic mapping. Instead, each country sets its own standards and priorities. Most often the case, each mapping agency designs its topographic maps with a specific goal in mind.
For example, constructing a new highway might drive a topographic map to feature woodland cover, soil types, or rock classification along the route. Over time, topographic map series often get periodic updates. But the truth is, they can be complex and take years to create.
In the United States, the first USGS topographic map was surveyed in 1892. Since then, map revisions have continued for over 125+ years. The USGS produce topo maps at 1:250,000, 1:100,000, 1:63,360 and 1:24,000. The most common is the 7.5-minute quadrangle series where one inch in the map represents 24,000 inches on the ground.
Another example of a topographic map is the USGS Tapestry of Time and Terrain. This colorful map overlays topography with underlying rock formations. This helps unravel the geologic history of the continent, such as mountain-building events.
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The Definition Of Topography
Topography is the study of the land surface. In particular, it lays the underlying foundation of a landscape. For example, topography refers to mountains, valleys, rivers, or craters on the surface.
The origin of topography comes from topo for place and graphia for writing. Its closely related to geodesy and surveying which are concerned with accurately measuring the land surface. And its also closely tied to geography and mapping systems like GIS.
Elevation is the distinguishing factor for topographic maps. In GIS, we use digital elevation models for the terrain. Nine out of ten topographic maps show contour lines, which are just lines of equal elevation. The narrow definition of topography is specific to the arrangement of landforms.
But in a broader sense, it incorporates natural and artificial features. For example, topographic maps often tie in administrative boundaries, cities, hydrography, parks, landmarks, transportation, and buildings.
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Which Country Has Lowest Elevation
The MaldivesThe Maldives made up of a chain of nearly 1 200 mostly uninhabited islands in the Indian Ocean is the lowest country in the world. Not one of its coral islands is more than six feet above sea level making the country vulnerable to a rise in sea level associated with climate change.Feb 7 2014
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Elevation Facts For Kids
When talking about geography the elevation of a certain point is how high it is compared to some reference point. Very often, the reference point is mean sea level, the level of the ocean midway between high and low tide on an average day. Most land has a positive elevation, which means it is above sea level. A few desert places are below sea level, thus have negative elevation.
Sometimes elevation is measured against the center of the earth. The problem there is that the earth does not really look like a ball, it is slightly squashed . This means, that while still at mean sea level , some points are father away from the center of the earth than others. That way the peak of Chimborazo, a volcano in Ecuador is farther away from the center of the earth than the peak of Mount Everest. Yet, Mount Everest is higher above sea level.
What Is Elevation And Plan
Plans and elevations are 2D drawings of a 3D shape. A plan is a scale drawing showing a 3D shape when it is looked at from above. An elevation is the view of a 3D shape when it is looked at from the side or from the front. When an architect designs a building they will draw the plans and elevation of a building.
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What Is Population Geography In Simple Words
Population geography relates spatial variations in the distribution, composition, migration, and growth of populations to the terrain. Population geography involves demography in a geographical perspective. It focuses on the characteristics of population distributions that change in a spatial context.
Elevation And Sea Level
The sea level, just like the Earth’s surface, is not even and some places tend to be higher than others. The sea level that is used as the geoid refers to the mean sea level. The height of physical features such as mountains is measured from the sea level rather than the ground level. For example, when Mount Everest is said to be 17,057 ft tall, this height is measured from sea level rather than the vertical height. If the height of the mountain is measured from the seafloor, then Hawaiis Mauna Kea would be the tallest at 32,696 ft. The lowest elevation on the surface of the planet is the shore of the Dead Sea, located on the border between Jordan and Israel, at an elevation of 1,385 ft below the sea level.
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How Do You Add Spot Elevations In Civil 3d
To add surface spot elevation labels on a grid
How do you add spot elevations on the grid?
Adding Spot Elevation Labels On Grid
Where do you find the abbreviation for spot elevation?
The abbreviation will appear at the end of the callout. Spot Elevation abbreviations usually consist of two letters that define the point. For instance FG =Finished Grade, TW =Top of Wall, TP =Top of Paving, etc. The Point 2 and Point 3 fields allow you to place multiple elevations in one callout.
How Can I Find My Elevation
By now, you may have become curious to find the elevation of your current location. Thankfully, you dont have to do a crash course in elevation calculation to satiate that curiosity. There are a host of web tools available at your disposal for just that. Elevation Map, for example, uses data from LiDAR digital elevation models to give you an approximate elevation value of the desired location with a simple click:
For more professional use, Google Maps Platform has an Elevation API as part of its client-side Maps JavaScript API. This API not only provides elevation data for all locations on the surface of the earth, it also returns negative values if you search for depth locations on the ocean floor.
To sum up, elevation is the vertical distance between two points on the Earths surface. There are various vertical datums governing the measurement of elevation, and their understanding is important to use elevation effectively.
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What Is Elevation In Geography For Kids
Elevation is distance above sea level. Elevations are usually measured in meters or feet. They can be shown on maps by contour lines, which connect points with the same elevation by bands of color or by numbers giving the exact elevations of particular points on the Earths surface.
Elevation In Geography Topic
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How To Interpret A Topographic Map
Elevation in a map can be shown using contour lines or using different bands of colors or with numerical values to indicate the height or depth. If represented in a numerical form it is definitely easy to read the map and assess the terrain. But it may frequently become difficult for a single map to show the sharp or slow gradient of the elevation. Hence in many ways, a contour map proves to be a much better solution to show the variation of elevation in an area. Here are a few pointers to interpret a contour map:
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Geography : Find Your Elevation
Mount Everest with an elevation of 8,848 meters is Earths highest mountain above sea level
Ever taken a picture from the top of a mountain and wondered what number to put in the Instagram caption to tell the world how high you are? The number youre looking for is called elevation.
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What Are Spot Levels
Each surveyed point taken is referred to as a Spot level or Spot height. That means it is the level at that particular point compared with a datum.
What is a spot shot on a topographic map?
Define spot shot. Usualy the peak of a hill or mountain on a topographic map and is indicated by an X. How do you know where the river is located on a topographic map?
What is spot elevation on a topographic map?
Spot elevation: A point on a map where height above mean sea level is noted, usually by a dot and elevation value it is shown wherever practical .
Uses Of Elevation Maps
Elevations maps have numerous uses in various fields. They not only show the terrains in an area but also give the heights of various structures which help in determining the accessibility to these areas. Here are a few of the common uses of the elevation maps
Elevation maps are therefore important in all spans of technology be is military, different farming or zoning. With the help of the evaluation maps many predictions can also be done with the help of different base data and models.
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Bench Mark And Mean Sea Level
A bench mark is a permanent mark established in a field to use as a reference point. A bench mark can be a concrete base in which an iron bar is fixed, indicating the exact place of the reference point.
A bench mark can also be a permanent object on the farm, such as the top of a concrete structure.
In most countries the topographical departments have established a national network of bench marks with officially registered elevations. All bench mark heights are given in relationship to the one national datum plane which in general is the mean sea level .
Fig. 52. A bench mark and mean sea level
EXAMPLE
In Figure 52, the elevation of point A in relation to the bench mark is 5 metres. The BM elevation relative to the mean sea level is 10 m. Thus, the elevation of point A relative to the MSL is 5 m + 10 m = 15 m and is called the reduced level of A.
QUESTION
What is the reduced level of point B in Figure 52.
ANSWER
The elevation of B relative to BM = 3 m
The elevation of BM relative to MSL = 10 m
Thus, the reduced level of B = 3 m + 10 m = 13 m
QUESTION
What is the difference in elevation between A and B? What does it represent?
ANSWER
The difference in elevation between A and B is the reduced level of A minus the reduced level of B = 15 m – 13 m = 2 m, which represents the vertical distance between A and B.