One of the most important discoveries in the field of earth observation is the discovery of spectral indices. At dawn of the development of this branch, it turned out that in many cases the analysis of spectral reflectance in certain spectral zones was not enough. In some cases, the ratios or differences of reflection of […]
When we perform image classification, we try to get the best possible result. Despite this, often the result of the classification, although good, is not perfect. And no classification procedure settings can improve the accuracy of class recognition. In this case, it is possible to improve the result using post-processing algorithms. They include procedures for combining […]
This post is already the third one from a series of methods for automated change detection. Both past posts talked about different ways of directly comparing multi-temporal satellite images. But you can instead compare the thematic classification maps that are created separately for each image. The general scheme for finding changes by comparing multi-temporal classification […]
The analysis of the multidimensional spectral feature space is a very useful tool for decoding multiband satellite images. Its use helps to choose the optimal classification algorithm. You can also directly classify objects in a multidimensional spectral feature space, and then transfer them to two-dimensional geographic space of the space image. These two areas of […]
One of the main tasks of Earth observation is the monitoring of objects and phenomena on its surface. The regularity of the satellite remote sensing allows for constant monitoring and quick detection and evaluation of changes in natural and transformed landscapes. This information is very useful and is applied in land use management, forest management, […]
Planet Explorer is a web browser interface used to search and view imagery from the archive of Planet Labs. This web application provides access to daily satellite imagery for customers, researchers and the general public. Data access At the moment, there is an option to subscribe to a free two-week trial, after which you […]
Earlier we have written about assessing classification accuracy. The post dealt with creating confusion matrix. But the topic is not resolved with that as it has some more interesting points. While assessing the accuracy of automated classification results one has to answer these two questions: which assessment method should be selected? where and how to […]
Ukraine is rich in natural resources. However, such richness often bears to the nation not the prosperity but new problems – social, political, and environmental. One of the brightest examples is so-called “amber fever” that flushed out in Ukraine recently. Rising prices for amber in the world market after 2010 accompanied with a long-term deepening […]
Laser scanning systems have long been used successfully for mapping and monitoring of the environment. The range of application of the system is very wide – from the construction of 3D models, mapping of coastline, forecasting landslides and floods, studying the habitats of animals, to assessing the effects of various environmental impacts. Lidar (from the […]
Under conditions of climate change, degradation of transformed aquatic ecosystems and reduction of biodiversity many international scientists focus their attention on beavers. Why? Because these animals are capable of miracles! The presence of beavers and the creation of beaver ponds increases the number of birds, amphibians, fish, preserves and purifies water, promotes the rise of […]
