Top GIS questions and answers

Let's start asking GIS related questions and get simple and focused answers!
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GEO University Supports Copernicus Hackathon Sofia

We are proud to announce that GEO University supports the Copernicus Hackathon Bulgaria! As we are dedicated in providing state-of-art online courses in the fields of GIS and Earth Observation, supporting a great hackathon like Copernicus Hackathon is really exciting for us.
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Satellite Image Metadata and their applications in Remote Sensing

In most introductory courses and lessons for Remote Sensing, the mechanics of the Remote Sensing system are explained, along with the basic mathematics and algorithms of image processing for satellite imagery. However, we tend to overlook the image metadata parameters, and sometimes, especially for Very High Resolution Imagery, they significantly affect the image processing workflows or can be even used to directly yield useful information from the images!
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Oil spills detection and identification with Synthetic Aperture Radar (SAR)

How to detect and monitor oil spills from space?

In the last decades oil spill pollution is a matter of great concern since it affects the environment, economy, life cycle, the human food chain and as a result constitutes a crucial environmental and socio-economic problem. Oil spills can seriously damage beaches, marshlands and fragile marine ecosystems. This happens because oil-petroleum hydrocarbons contain many toxic compounds that cause huge damages in vegetation but in greater level to the Sea life
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Remote sensing technologies and soil moisture retrieval

What kind of Earth Observation technologies are used to retrieve soil moisture?

Soil moisture is one of the most difficult soil properties to measure because of its large spatial and temporal variability.
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How to detect and map forest fires using Earth Observation images?

Exploiting MODIS and Landsat satellite images

Forest fires are one of the main causes of destruction of natural resources and this is observed on a global scale. Many countries worldwide are affected by this calamity, which is induced by nature and human activities. Using satellite data it is revealed that in last decade nearly 350 million hectares of land was affected by vegetation fires worldwide...
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An automatic relative radiometric normalization methodology for multispectral and hyperspectral images

How to automatically correct the radiometry of optical Earth Observation images?

Multi-temporal airborne and satellite multispectral/hyperspectral images are often used for monitoring the environment and detecting land cover changes. The different atmospheric and illumination conditions, sensor performance and viewing angles result into differences in the reflectance values of the same objects in multi-temporal images...
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A SEMANTIC AWARE METHOD FOR RETRIEVING REMOTE SENSING IMAGES

How to find satellite images with a semantic concept?

Content-based remote sensing image retrieval techniques have been introduced for bridging the gap between low-level semantics of images and high-level semantics of user queries...
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MAKING HIGH RESOLUTION SEAMLESS CLOUDLESS MOSAIC OF ESTONIA

Cloud free mosaics or composites products are a special type of advanced Earth Observation products that can be used in numerous applications. The process of creating high resolution and accurate seamless cloud-free mosaics is a very sophisticated and time consuming process.
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Coastal environmental monitoring

How to monitor water quality from space?

The coastal habitats including the near shore water and land bodies are essential for the sustainable development of the economy and play an important role to the societal growth. Decision makers, urban planners, and environmental organisations are using Geographic Information Systems (GIS) along with satellite images and ground through data to help them understand and better manage the local ecosystem.
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Promote your geospatial knowledge and advance your career with certificates!

Did you know that courses in GEO University come with digital certificates?

Receiving a digital certificate upon completion of a course is an important part of learning culture. Each student that enrolls and succesfully finishes a course can claim AT NO EXTRA COST their certificate of completion and the corresponding badge...
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Creating maps and geospatial stories

Maps. The tool for our eyes to comprehend the spatial world at smaller scales.

Day by day, the difficulty in creating such tool is decreased. Thanks to new technologies and the massive availability of data, everyone is able to create a map. And what can this map represent? Anything that has spatial attributes! Whichever element has a defined location can be represented on a map. In urban planning, for example, buildings can be illustrated as polygons, roads as lines and trees as points...
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SAR Interferometry with SARscape

How to generate a Digital Elevation Model in 7 steps with SAR images and SARscape?

Step 1: Baseline Estimation The initial pair of SAR images in slc format is given as input and some field information about the track is filled in by the program...
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Retrieve Soil Moisture with S-band SAR images

How can we retrieve soil moisture with SAR images?

In the past years Synthetic Aperture Radar (SAR) was successfully applied to soil moisture retrieval with promising results and the launch of dedicated space missions carrying a radar sensor is evidence of its increasing importance. An significant example is represented by the Soil Moisture Active Passive (SMAP) mission, designed by NASA and launched in January 2015. SMAP carries both a radiometer and a SAR in L-band to improve both resolution and accuracy in the soil moisture retrieval. Another mission having soil moisture characterization among its potential application fields is the UK NovaSAR-S...
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The effects of the soil surface roughness and soil moisture content on the soil spectral signature

How spectral signatures are affected by soil variations?

The estimation of soil moisture is approached by various remote sensing technologies. Initially the main research focused on the Synthetic Aperture RADAR (SAR) images. SAR are widely used for this purpose because of the relatively deep penetration of the microwave radiation, up to one meter deep. Despite this advantage SAR imagery suffer from high noise levels (speckle) and the surface roughness derived from the backscatter coefficient can significantly alter the results....
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Spectral Indices with multispectral satellite data

Why use spectral indices from satellites?

Over the years numerous spectral indices have been introduced by the scientific community to solve complex environmental (or other) issues. After a quite extensive survey we present you the most popular indices that be calculated by either of the following free data satellites...
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QGIS 3.0 as a Business Model

How to use QGIS within your business?

QGIS is the most popular Geographic Information Systems (GIS) software in the geoscientific community. Its interface is friendly and intuitive; its operation is simple; there is a large amount of resources to be used; it presents open source code that allows to modify or customize the platform, among other qualities...
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How to download satellite images?

A first step to start learning Remote Sensing

So you are interesting in downloading satellite images? Let's start from the top by defining a satellite image. Satellite images or in a more scientific terminology, satellite remote sensing images, are data in the form of images that are collected using satellites in orbit around the Earth.
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GIS and Earth Observation to support the UN SDGs

The Sustainable Development Goals are the blueprint to achieve a better and more sustainable future for all. They address the global challenges we face, including those related to poverty, inequality, climate, environmental degradation, prosperity, and peace and justice. The Goals interconnect and in order to leave no one behind, it is important that we achieve each Goal and target by 2030
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Map Glaciers and snow using Sentinel 2 and ESA SNAP software

Climate is changing. Constantly. Our most fragile ecosystems, Glaciers are the ones that are first affected by global warming. How to use multispectral images to map glaciers of the world?
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What is Geographic Information Systems (GIS)? The GIS Application in Everyday Life

Nowadays, along with the development of information technology, GIS is also applied in socio-economic development more urgently than before. The development of GIS is considered as a new step in spatial data management. So what is GIS? What are GIS Applications in everyday life? Let’s find out in the following article
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