The difference between aerial and satellite imagery
Mar 2023
Learn the differences between aerial maps and satellite maps and which is best for use in every day business decisions with geospatial imagery and data.
Mar 2023
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Geospatial mapping and data have come a long way in a short amount of time, providing us with effective ways to study the past and plan our future. Two main players in the geospatial technology game are aerial and satellite imagery. Both offer us a view of the ground from above – but what’s the difference between the two? This article will explain how each type of imagery works, as well as their similarities and what sets them apart.
What is aerial imagery?
With origins tracing back to as early as 1858, aerial imagery is one of the earliest forms of collecting, analysing and archiving geospatial data. Balloons and kites have been replaced by planes, drones, and some of the most sophisticated camera systems in the world when it comes to gathering this information.
From a technical standpoint, aerial imagery is classified as any image taken from an airborne craft. This imagery provides a birds-eye view of the world below, offering an aerial perspective of varying scales and scopes.
What are the characteristics of aerial photographs?
The five main characteristics of aerial photographs are time-freezing, 3D perspective, birds-eye view, readily available and sensitive. These characteristics enable us to take measurements, play with perspective, and obtain an unmatched level of spatial data and detail, including angles, shapes, size and depth. Aerial photographs capture moments in time on the Earth’s surface that are crucial for historical purposes and future projections.
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What are the types of aerial photographs?
The main types of aerial photographs are defined by the angle at which they’re taken. Classic vertical photographs are taken with the camera axis in a vertical position, yielding the direct, overhead result that you often see in mapping. To capture low oblique photographs, the camera axis must be tilted at least three degrees. These photos are useful for taking close-up shots that need more detail. Finally, high oblique photos are shot at about 60 degrees – this covers a larger, wider view to identify geographical features and landmarks.
What are the advantages of aerial photographs?
Aerial photographs have many advantages for businesses. The photographs can capture fine detail and cover wide areas, the process is time and cost-efficient, and the imagery can be used for a whole range of industries. Aerial imagery and its associated geospatial data can be applied to disciplines as varied as construction, insurance, real estate, agriculture, urban planning, environmental studies, and wildlife monitoring.
For example, Nearmap provides users with access to the most clear, accurate and up-to-date aerial imagery covering 75% of the New Zealand population. This timely approach to data collection gives users the advantage of gaining truthful insights that are extremely useful in a wide range of industries.
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What is satellite imagery?
It’s all in the name! Satellite imagery is basically images of Earth collected by imaging satellites – operated by governments and businesses around the world – and accessed through satellite imaging companies and services.
What are three main types of satellite imagery?
The three main types of satellite imagery available are visible, infrared, and water vapour. Visible imagery is what you likely think of when you see imagery of the Earth from afar – the white clouds, dark water and grey-looking earth. Conversely, infrared imagery shows clouds both by day and night, and is useful for determining things like thunderstorm intensity. Finally, water vapour imagery is the kind you see on a weather forecast map, where the different colours signify different moisture levels in the upper atmosphere.
What is the difference between a satellite image and a photograph?
So, satellite images are just photos of the sky from really far away, right? Not quite. Satellite images are taken using a series of electronic scanners incorporated in satellites that orbit the Earth, as opposed to images captured with a camera like a photograph. These satellites operate at altitudes that cameras can’t reach – we’re talking 60,000 feet up!
What are the benefits of satellite imagery?
Satellite imagery is an important resource, particularly in scientific research fields on a larger scale. As you can tell from the types of satellite imagery discussed above, it serves more niche applications than aerial imagery. Most satellites orbit the Earth regularly, meaning this vital scientific tracking and mapping information is readily available to the industries that need it.
What’s the difference?
The gap between aerial and satellite imagery is shrinking every day as technology advances. However, there are two key differences between satellite and aerial imagery – how much area they cover, and their main use cases. Satellite imagery covers a wider area that makes it ideal for larger-scale scientific operations. In contrast, aerial photography is taken at a lower altitude and provides more detail, so it is extremely useful for commercial applications.
Aerial imagery provides the most accurate data and captures, making it the logical choice for most use cases. Nearmap is constantly capturing the highest quality aerial imagery and uploading it to the cloud within days - made possible by our patented camera sensors and the most advanced imagery processing pipelines in the world. Users therefore know they’re seeing the truth on the ground when looking at both current and historical geospatial data.
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Where satellite imagery quality is often compromised by atmospheric and weather conditions, Nearmap aerial imagery gives users a clear and current overview of landscapes all around New Zealand. Nearmap takes a holistic approach to aerial imagery, meaning users benefit from the most true-to-life content captured by the best imaging technology available.
Nearmap aerial imagery has become integral to many businesses and government agencies around the world. Instead of heavy jargon and clunky interfaces, Nearmap offers geospatial content as a practical, quality, and easy-to-use service. Whether it’s for a project manager conducting a virtual site visit or a GIS engineer creating specialised maps, Nearmap world-class aerial imagery helps users achieve three things – better decision making, lower project costs, and more streamlined operations.
Aerial Imagery | Satellite Imagery | |
|---|---|---|
Captured by... | Camera systems attached to airborne craft such as planes and drones | Electronic scanners in satellites |
Types include… | Vertical and High and Low Oblique | Visible, Infrared, Water Vapour |
Best suited for… | Commercial applications across various industries - from construction and real estate to insurance an urban planning | Wide-scale scientific operations |
Advantages include… | Higher detail and more accurate | Covers a wider area |
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